Why are Turbo IS's slow? - Lexus IS Forum
User Tag List

Reply
 
LinkBack Thread Tools
post #1 of 116 (permalink) Old 11-08-2005, 02:27 PM Thread Starter
Lurker
 
Join Date: May 2005
Posts: 62
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Why are Turbo IS's slow?

Now the title is a bit negative, just wanted to get your attention. I was just thinking the other night how all the big power IS's on the site...are still running pretty sub par in the 1/4. The fastest ive seen documented is what...11.0's? With 700 whp on tap....that has to be a traction issue?

I know the car is not all about quarter mile times, its a great all around car and I love mine even though its not boosted...im just failing to see why its so hard to get the car to hook and go fast in the 1/4. I have a 62 impala, which is about a thousand more pounds than IS, and it only has about 550 whp...and im running 11.40's....gearing is also set up for 1/4...but regardless..im failing to see why a decently powered IS is not in the low 10's or even high 9's.

whats up?
Melk_IS is offline  
Sponsored Links
Advertisement
 
post #2 of 116 (permalink) Old 11-08-2005, 02:29 PM
Under House Arrest
 
mikefate's Avatar
 
Join Date: Feb 2003
Location: the f'in ghetto
Posts: 12,375
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
when you hit the gas, the tires go spinny
mikefate is offline  
post #3 of 116 (permalink) Old 11-08-2005, 02:51 PM
Follower
 
phamous101's Avatar
 
Join Date: Sep 2003
Location: charlotte, nc
Posts: 635
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
           
rear suspension is not made for big power, to much twist and flex.

^ when combined with some sticky-ickies you got wheel hop..... thats when shit breaks. call a tow truck

PT72GTQ

11.6 @ 124.5
phamous101 is offline  
 
post #4 of 116 (permalink) Old 11-08-2005, 02:59 PM
Enthusiast
 
Join Date: Apr 2004
Location: Birmingham, AL
Posts: 1,396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
^ exactly the IS was never meant to be a drag car to make it such you mights as well get a strange 9 incher and throw it back there powered by the 2JZ backed up by a turbo 400 tranny. but then you just have a drag car

92 Volvo 940 Turbo
TD06-20g hybrid turbo built by Bryan at BNR Supercars, 25+ lbs of boost, custom headwork, new I/C, 3 inch exhaust, ford injectors and megasquirt. Waiting on finishing the wiring to get the numbers.
IceCold4x4 is offline  
post #5 of 116 (permalink) Old 11-08-2005, 06:32 PM
Fiend
 
Join Date: Nov 2005
Location: Miami..
Posts: 452
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Ignorance.....Buy a Mustang...

Current - E92 M3
Past - Turbo TCM IS300
OmarM is offline  
post #6 of 116 (permalink) Old 11-08-2005, 06:33 PM
Immortal
 
Join Date: Jun 2002
Location: Lake Worth, FL 33467
Posts: 20,660
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
           
Garage
Quote:
Originally Posted by OmarM
Ignorance.....Buy a Mustang...
F that...

buy a Supra

Master Certified Lexus VEHICLE TECHNOLOGY SPECIALIST and INTERNET SALES MANAGER @ LEXUS OF PALM BEACH
2015 NX200t F-SPORT ULTRASONIC BLUE
1993 Toyota Supra
SOLD 2002 IBP JDM NEO/RANDO TURBO
[email protected] 17 psi
R.I.P. 2001 SBM L-TUNED Toyomoto Built TURBO
LEXOTIC CONCEPTS NE017
tsopranoMB is offline  
post #7 of 116 (permalink) Old 11-08-2005, 06:38 PM
Fiend
 
Join Date: Nov 2005
Location: Miami..
Posts: 452
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Quote:
Originally Posted by tsopranoMB
F that...

buy a Supra
I second that.

Current - E92 M3
Past - Turbo TCM IS300
OmarM is offline  
post #8 of 116 (permalink) Old 11-08-2005, 06:47 PM
Extremist
 
Join Date: Mar 2005
Location: (909)+(626) <<<SOCAL>>>
Posts: 4,925
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
comparing:

9 second civic w/ 700HP(maybe 8 seconds)
11 second IS300 w/ 700HP

power to weight ratio. no matter how much weight u lose:

gutted boosted IS300 < gutted hatch w/ boosted K or B series


just an example. but correct me if im wrong?

Quote:
Originally Posted by Oteck
Anyone have an IS250?
Trying to get a measurement of the rear axle shaft thickness. I think the 250 and 350 are the same. Tried my.is and those guys are useless like they've never been under a car before.
Quote:
Originally Posted by Servin
What do you expect its a lexus, they probably never have.
onyxaltezza is offline  
post #9 of 116 (permalink) Old 11-08-2005, 07:29 PM
Deity
 
Join Date: Jul 2002
Location: MA
Posts: 10,234
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
           
Quote:
Originally Posted by tsopranoMB
F that...

buy a Supra
If you can find one for a reasonable price.
Eminence is offline  
post #10 of 116 (permalink) Old 11-08-2005, 07:34 PM
Addict
 
Join Date: Feb 2001
Location: Kittanning, PA
Posts: 2,693
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
           
Like mentioned above, the IS is not the best 1/4 mile car, but from a rolling start on the highway, there are some wicked-fast cars on this website.

**Faster than a Stock IS300!!**

2003 Alpine on Cinnamon ///M3 - 360 hp
FFR 65 Cobra Roadster - 400 hp
1995 Chevy Lumina - 210 hp (AKA Luminicious)
doodlebug is offline  
post #11 of 116 (permalink) Old 11-08-2005, 07:39 PM
Addict
 
Join Date: Oct 2003
Location: Ananaheim, CA
Posts: 2,597
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Quote:
Originally Posted by doodlebug
Like mentioned above, the IS is not the best 1/4 mile car, but from a rolling start on the highway, there are some wicked-fast cars on this website.

yuuuup, the IS is a "up top" car

i remember watching a vid clip on here...
haha "up top baby up top!!"
anyone remember what i am talking about?
K3RRY is offline  
post #12 of 116 (permalink) Old 11-08-2005, 07:48 PM
Guru
 
Join Date: Oct 2001
Location: Irvine, Cali
Posts: 8,219
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Quote:
Originally Posted by K3RRY
yuuuup, the IS is a "up top" car

i remember watching a vid clip on here...
haha "up top baby up top!!"
anyone remember what i am talking about?

hell yea man. That was DT yellin out for Fairuza back in the day...

2011 ZCP Melbourne Red M3 Coupe. 6MT
Malekreza11 is offline  
post #13 of 116 (permalink) Old 11-08-2005, 07:49 PM
Altruist
 
Join Date: Dec 2001
Location: New Orleans, LA---Da Ridge
Posts: 3,397
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
I just think there's not too many boosted is300's going to the track that often.......there's is300's on here that have done 10.6's with less than 575whp. It's all drivers here, nothing else. The car is capable of good numbers.....

Traction is a huge issue which will be overcome with driver experience and electronics......

Where are the 700rwhp civic hatches in street trim doing 9's? I wanna see that.....

-SRT Turbo, GTE block , V161 tranny, PT67 turbo, Haltech E6X, HKS Ignition, J&S, Tein Flex w/EDFC, 264 cams, stage 2 port and polished head, Supra brake upgrade, Koyo cooling, 4" custom exhaust with electrodump, stock rear end gearing = [email protected], thanks for robbing me of 50hp, J+S.
-Clothes make the man. Nude people have little to no influence on society.
xencloud is offline  
post #14 of 116 (permalink) Old 11-08-2005, 07:50 PM
Immortal
 
Join Date: Jun 2002
Location: Lake Worth, FL 33467
Posts: 20,660
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
           
Garage
Quote:
Originally Posted by Malekreza11
hell yea man. That was DT yellin out for Fairuza back in the day...

yup, I was at the track that day when it happened too...

great video...I got it somewhere....hmmmm

Master Certified Lexus VEHICLE TECHNOLOGY SPECIALIST and INTERNET SALES MANAGER @ LEXUS OF PALM BEACH
2015 NX200t F-SPORT ULTRASONIC BLUE
1993 Toyota Supra
SOLD 2002 IBP JDM NEO/RANDO TURBO
[email protected] 17 psi
R.I.P. 2001 SBM L-TUNED Toyomoto Built TURBO
LEXOTIC CONCEPTS NE017
tsopranoMB is offline  
post #15 of 116 (permalink) Old 11-08-2005, 07:51 PM
Immortal
 
Join Date: Jun 2002
Location: Lake Worth, FL 33467
Posts: 20,660
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
           
Garage
Quote:
Originally Posted by xencloud
I just think there's not too many boosted is300's going to the track that often.......there's is300's on here that have done 10.6's with less than 575whp. It's all drivers here, nothing else. The car is capable of good numbers.....

who's IS300 went 10.6 ?

Master Certified Lexus VEHICLE TECHNOLOGY SPECIALIST and INTERNET SALES MANAGER @ LEXUS OF PALM BEACH
2015 NX200t F-SPORT ULTRASONIC BLUE
1993 Toyota Supra
SOLD 2002 IBP JDM NEO/RANDO TURBO
[email protected] 17 psi
R.I.P. 2001 SBM L-TUNED Toyomoto Built TURBO
LEXOTIC CONCEPTS NE017
tsopranoMB is offline  
post #16 of 116 (permalink) Old 11-08-2005, 08:08 PM
Twisties Addict
 
bgwillyIS300's Avatar
 
Join Date: Nov 2002
Location: Cincy, Ohio
Posts: 13,069
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
would a complete supra rear end swap....half shafts and all take care of this problem>?

2010-Rossion Q1
2003 CW IS300 5spd ---"Back in the game"
Lotus Exige S--Sold
04 Turbo IS3--475[email protected]450[email protected]----SOLD :(

StraIght LiNes DoN't MeAn Sh*T when you have lowering springs
bgwillyIS300 is offline  
post #17 of 116 (permalink) Old 11-08-2005, 08:16 PM
Altruist
 
Join Date: Dec 2001
Location: New Orleans, LA---Da Ridge
Posts: 3,397
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
don't remember the name, but it was like a year ago, maybe even more.......I'll try finding it, wasn't it fairuza or something? I thought there was a couple of cars already in the 10's, could be wrong though.......

-SRT Turbo, GTE block , V161 tranny, PT67 turbo, Haltech E6X, HKS Ignition, J&S, Tein Flex w/EDFC, 264 cams, stage 2 port and polished head, Supra brake upgrade, Koyo cooling, 4" custom exhaust with electrodump, stock rear end gearing = [email protected], thanks for robbing me of 50hp, J+S.
-Clothes make the man. Nude people have little to no influence on society.
xencloud is offline  
post #18 of 116 (permalink) Old 11-08-2005, 08:17 PM
Addict
 
Join Date: Jul 2004
Location: Home of the Terps
Posts: 2,573
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
           
ahhh not gonna waste my breath

'02 MSM IS300TT L-Tuned 6spd.
2002 Lexus IS300TT 759rwhp 606tq @40psi (2004) Sold
'98 Toyota Supra Quicksilver TT 6spd. WOTM Built
'09 GMC Sierra SLT All Terrain/Texas Edition Z71 Black Bear Tuned
LexISpooled is offline  
post #19 of 116 (permalink) Old 11-08-2005, 08:19 PM
Immortal
 
Join Date: Jun 2002
Location: Lake Worth, FL 33467
Posts: 20,660
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
           
Garage
Quote:
Originally Posted by xencloud
don't remember the name, but it was like a year ago, maybe even more.......I'll try finding it, wasn't it fairuza or something? I thought there was a couple of cars already in the 10's, could be wrong though.......
if was never proven...and he was well over 600 HP with nitrous the day it happened too....supposedly.....

Master Certified Lexus VEHICLE TECHNOLOGY SPECIALIST and INTERNET SALES MANAGER @ LEXUS OF PALM BEACH
2015 NX200t F-SPORT ULTRASONIC BLUE
1993 Toyota Supra
SOLD 2002 IBP JDM NEO/RANDO TURBO
[email protected] 17 psi
R.I.P. 2001 SBM L-TUNED Toyomoto Built TURBO
LEXOTIC CONCEPTS NE017
tsopranoMB is offline  
post #20 of 116 (permalink) Old 11-08-2005, 08:41 PM
Follower
 
Join Date: May 2004
Location: Westminster, CA
Posts: 557
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
What trap speed does your impala run with the 11.4x et? My point is, v8 cars make more torque down low and torque is what gets the car going and hence, better et's. Is300's don't make much torque stock, and when boosted they still don't below 3500rpm. This means unless you load the converter at or near boost, your not going to get a good 60 foot, 330 and that's exactly why is300's et high and mile an hour high.
Not one person has done the turbo 400 swap over to make it drag worthy and it's almost a crime to do so because is300's handle so good. Putting a 4k stall w/transbrake would make it worthless for anything but drag. That swap alone would probably net a full second reduction in ET though. A 130mph trap is definately good for low 10's. Im guessing your Impala does around 118-120mph with a 11.4x et, and maybe less if you got a big block. I would venture to say most 400rwhp and up is300's will walk that from a roll of 60mph and up.
Supra's have the same delemma, so having a supra would be no better. Most of the fastest supra's are t400's or powerglides.
DanielIS300 is offline  
post #21 of 116 (permalink) Old 11-08-2005, 09:10 PM
Guru
 
TeCKis300's Avatar
 
Join Date: Aug 2001
Location: San Diego
Posts: 6,606
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
           
It's all about traction!! I have not yet seen one high hp IS which has taken the traction issue seriously. About all everyone does is slap a set of drag slicks on a street configured IS. Every street configured IS out there runs some sort of lowering springs / super stiff coilovers with about 1.8-2.2 degrees of camber. This configuration GREATLY reduces any traction potential at the line and with the relatively softer bushings...the suspension just deflects more even more giving less traction. Doesn't help that there are no real camber kits out there.

What I want to see is a nicely configured IS at STOCK height with 0 camber and with moderately stiffer than stock springs to avoid compression related camber. Also, some nice stiff urethange bushing will help greatly. Solid axle cars don't have such a worry...their tires are always square with the ground. Also, more simplier strut based suspensions don't have as aggressive as a camber curve so they tend to lauch better as well. And FWD...they have weight transfer issues but at least the contact patches stay square. Such is the price to pay for a sophisticated suspension that is geared more towards handling.

Car sold to a good new home!

Full Aristo 2JZ-GTE BPU++ - Getrag v161 - EMU - Brembo BBK - CCW Classics 9F/10.5R - 255/35F - 285/30R - AAR Arms - GReddy Type-S - Hotchkis Sways - Teck Kit - Prolex / Cusco STB - Full ICE - HKS Drager - Prosport Prem Boost/EGT/FP - Innovative LC-1/XD-16 - Goodridge SS - TRD F/R Underbrace - Greddy Profec B Spec II - Megan Toe Arms
TeCKis300 is offline  
post #22 of 116 (permalink) Old 11-08-2005, 09:14 PM
Guru
 
Join Date: Oct 2001
Location: Irvine, Cali
Posts: 8,219
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Quote:
Originally Posted by TeCKis300
It's all about traction!! I have not yet seen one high hp IS which has taken the traction issue seriously. About all everyone does is slap a set of drag slicks on a street configured IS. Every street configured IS out there runs some sort of lowering springs / super stiff coilovers with about 1.8-2.2 degrees of camber. This configuration GREATLY reduces any traction potential at the line and with the relatively softer bushings...the suspension just deflects more even more giving less traction. Doesn't help that there are no real camber kits out there.

What I want to see is a nicely configured IS at STOCK height with 0 camber and with moderately stiffer than stock springs to avoid compression related camber. Also, some nice stiff urethange bushing will help greatly. Solid axle cars don't have such a worry...their tires are always square with the ground. Also, more simplier strut based suspensions don't have as aggressive as a camber curve so they tend to lauch better as well. And FWD...they have weight transfer issues but at least the contact patches stay square. Such is the price to pay for a sophisticated suspension that is geared more towards handling.
couldnt have said it better myself.

2011 ZCP Melbourne Red M3 Coupe. 6MT
Malekreza11 is offline  
post #23 of 116 (permalink) Old 11-09-2005, 01:46 AM
Deity
 
Join Date: Oct 2002
Location: Arkinsaw
Posts: 13,903
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
           
I can see what you are saying, but I'll use the old cliche:
Drag racing an IS is like taking a hooker fishing. It is fun, but that's not what she's for.

Caution! Spoiler! (Highlight to View)
You're looking at my sig. You care.
the wrong tone is offline  
post #24 of 116 (permalink) Old 11-09-2005, 01:59 AM
Guru
 
Join Date: Aug 2003
Location: Torrance LA, Camp Patriot Kuwait
Posts: 6,782
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 26 Post(s)
           
TeCKis300 knocked it out. It seems to be a lack in tuning, and when we hear tuning here, we think engine right away, but its a lack in suspension tuning, and not to mention how hapazard the tranny swaps are. If you follow BMWs at all, you'll see how gear ratios mean the world.
From what I've seen I have yet to see an IS that has had a good rear suspension set up post 1/4 times.

Even things as simple as my tein flex, with rear shocks on stiff, and a recent corner weigh done while putting my car back to near stock ride hight with a semi agressive (very little negative camber) has worked wonders with my brake bais, and my rear tires do not chirp hardly as easily as before from stops.

B.

TokenSolutions is moving to an in-house forum and facebook. Google TokenSolutions forumer.
BlackSportD is offline  
post #25 of 116 (permalink) Old 11-09-2005, 02:01 AM
Aficionado
 
Join Date: Sep 2004
Posts: 851
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
who the F wants a 9 sec IS? that shit aint streetable. i aint forkin over the $$ to have a non streetable car when im done. that just isnt kosher. get yourself a shitty ass 1990 sentra, add a strong motor, bottle feed it and strap a big ass turbo if you want a drag racer.
intuitdriver is offline  
post #26 of 116 (permalink) Old 11-09-2005, 02:09 AM
Guru
 
Join Date: Aug 2003
Location: Torrance LA, Camp Patriot Kuwait
Posts: 6,782
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 26 Post(s)
           
^^^ lol.

Too true. I guess some people get carried away. I still don't get the peeps who strap huge non twin scroll turbos to the purpose built Evo 8, I guess its dino-queenism or something. I'd be damned I gotta brake boost around corners, I want to drive a "well done" streatable car, not a time attack car.

The IS has the potencial of being a great all around car, a jack of all trades, a master of none. It can go fast strait line if done right but its not going to be the biggest fish, but can also handle, brake, seat 4 and be confortable IMO.

B.

TokenSolutions is moving to an in-house forum and facebook. Google TokenSolutions forumer.
BlackSportD is offline  
post #27 of 116 (permalink) Old 11-09-2005, 08:53 AM
Deity
 
Join Date: Jul 2002
Location: MA
Posts: 10,234
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
           
Big HP numbers are usually for bragging rights.
Eminence is offline  
post #28 of 116 (permalink) Old 11-09-2005, 09:52 AM
Mr. Negative
 
IS_Dude's Avatar
 
Join Date: Feb 2002
Location: Savannah
Posts: 12,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
few comments, don't feel like quoting all the relevent posts so take offense where needed.

observation:
complete rear from supra won't fit, this ain't a sc300


Jeff's top 10 reasons the IS is slow in the 1/4:

10: stock rear arms, links, bushings, and suspension are all hmmmmm... crappy. well their fine for a 215hp car.
9: bushings are a joke in the rear. you can flex the rear suspension w/ a screwdriver.
8: people run 19's w/ 30series complain about traction.... durrr..
7: people run crappy tires
6: no rear suspension upgrades
5: no suspension setup and dial in
4: 2.2 60fts
3: straight line racing is boring
2: people weigh too much

drumroll















1: people can't drive

2010 Lotus Exige S260 Sport
2007 E63 AMG
2003 IS300T 23k miles - 700whp

Sold-
Ferrari 360 F1
97 JZA80
2001 IS300T
IS_Dude is offline  
post #29 of 116 (permalink) Old 11-09-2005, 10:06 AM
Lurker
 
Join Date: Aug 2005
Location: denver colorado
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
I dont even worry about the 1/4 mile with my buddies cause i can take almost all of them on a roll... including 2 WRX's
iswrx is offline  
post #30 of 116 (permalink) Old 11-09-2005, 10:10 AM
Guru
 
Join Date: Oct 2001
Location: Irvine, Cali
Posts: 8,219
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
           
Quote:
Originally Posted by IS_Dude

1: people can't drive

Probably the best upgrade to how fast your car is... learning to drive it!

IS' arent slow in my opinion... Not meant to be an off the line car.

2011 ZCP Melbourne Red M3 Coupe. 6MT
Malekreza11 is offline  
Sponsored Links
Advertisement
 
Reply

  Lexus IS Forum > 1st-Gen IS300 > Go Faster

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Lexus IS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself. If your address is invalid, you will likely lose access to the site.

Email Address:
OR

Log-in











Current users viewing this Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome