420whp, was expecting more? - Page 2 - Lexus IS Forum
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post #16 of 34 (permalink) Old 12-04-2017, 06:57 PM Thread Starter
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Originally Posted by somguy2u View Post
500whp is about right for what you are have. stock throttle is a bottleneck. it's not really the throttle but the plenum. the cams are not the bottleneck. a .59 ar on 62 would un out of breath high rpm at 500whp. midrange response i am sure is awesome though. I run a t04z with a .70a/r hot side and LOVE the midrange -but even it runs out of breath on the top end. similar set-up. i got s few more horse power out of it.

not sure what you were expecting; this is not a car that you slap a turbo on and make 1,452,937 hp
Was expecting more than 423whp is all. But that was until we realized the exhaust side of the turbo was so small. With a larger turbo I believe it can make 500whp on stock cams and intake, but that may not be seen as I am likely going to go GTE upper intake and cams right away.
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post #17 of 34 (permalink) Old 12-08-2017, 07:24 AM
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What exhaust is on the car?

Almost all of the aftermarket exhaust systems for the IS are 2.5” or less. Moving from a HKS to straight 3” made a huge difference on mine.

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post #18 of 34 (permalink) Old 12-15-2017, 09:26 AM Thread Starter
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Originally Posted by Hardrvin View Post
What exhaust is on the car?

Almost all of the aftermarket exhaust systems for the IS are 2.5” or less. Moving from a HKS to straight 3” made a huge difference on mine.
Custom 3" V-band all the way back with a small straight through muffler. New turbo has a 3.5" exit so will be 3.5" DP forsure and possibly all the way back.
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post #19 of 34 (permalink) Old 12-16-2017, 09:53 AM
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Originally Posted by Sniper512 View Post
Custom 3" V-band all the way back with a small straight through muffler. New turbo has a 3.5" exit so will be 3.5" DP forsure and possibly all the way back.
3.5 would be better, but not necessary.

Looking at your dyno graph again, definitely drops something fierce up top. I'm assuming the lower blue line is your boost curve?

What's the target ignition timing by RPM? Wondering if you're tuner isn't feeding in enough up top.

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Last edited by Hardrvin; 12-22-2017 at 08:49 AM.
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post #20 of 34 (permalink) Old 12-20-2017, 11:43 AM Thread Starter
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Originally Posted by Hardrvin View Post
3.5 would be better, but not necessary.

Looking at your Dino graph again, definitely drops something fierce up top. I'm assuming the lower blue line is your boost curve?

What's the target ignition timing by RPM? Wondering if you're tuner isn't feeding in enough up top.
And there is why it didn't make as much power as I thought. I looked over the timing charts and all looks good compared to other 2J charts I have seen trying to achieve my power goals. I believe it is just a restriction on the exhaust side. 423whp on a .68 A/R seems pretty good. I will post up new numbers and sheet when the S366 gets tuned later this winter.
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post #21 of 34 (permalink) Old 01-14-2018, 11:11 AM
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Power is fair for the small exhaust side, but probably depends a bit on the dyno. Overall I would be more concerned about how it still looks kind of 'peaky'. Normally would expect 0.6x A/R to hit strong early, hold for a while, and then fall off early. Instead it looks like it hits relatively late and falls off early.

At 3000rpms you have a little rise start to happen, then it drops and takes its time. For the 'meh/blah' instead of bananas level of torque you should be seeing I would still investigate BOV holding boost under pressure, if you're VVTi is working, if wastegate is opening early etc...

for example - My synchronic BOV I tested ten ways from Sunday and tried multiple inventive ways to keep more pressure on it so it. It would hold boost while being tested but in service tiniest pressure fluctuation on my reference lines would lift it. In the end I swapped to an ebay knock-off BOV in garage and instantly fixed my problem.

Ever hook up a boost gauge to the turbo itself and see how much boost it was running and compare to downstream of intercooler?
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post #22 of 34 (permalink) Old 01-14-2018, 12:46 PM
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I agree with the above post. You'd have really quick spool with lots of low end torque with a .63 a/r but this doesn't seem to be the case. Your peak torque should be around 4000rpm with that size exhaust housing and obviously it would suffer up top. I would also check for leaks in all of your plumbing.

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post #23 of 34 (permalink) Old 01-20-2018, 08:04 PM Thread Starter
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So I found the boost leak. The pipe going into the throttle body was crushed by the t-clamp from being weakened where they installed the IAC feed and was leaking I presume quite badly. The IAC valve was an after thought and done after the pre-dyno inspection. So between that and the small exhaust housing it's no wonder the graph looks so odd. Thanks so much for all your help. Very much appreciated!
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post #24 of 34 (permalink) Old 11-16-2018, 11:25 AM
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Same Setup Here and a piddly 363whp.

Precision 6262 .68 a/r
Link ecu, 850cc inj, Aeromotive return setup
Aristo motor
CD009 Tranny

Tuner pointed at the .68 rear housing, but this is much lower than I was expecting. 91 pump around 19psi.
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post #25 of 34 (permalink) Old 11-16-2018, 02:01 PM
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Quote:
Originally Posted by akarilo View Post
Same Setup Here and a piddly 363whp.

Precision 6262 .68 a/r
Link ecu, 850cc inj, Aeromotive return setup
Aristo motor
CD009 Tranny

Tuner pointed at the .68 rear housing, but this is much lower than I was expecting. 91 pump around 19psi.
Humble Performance...that’s in Tulsa right?
I’ve got a .68 on my Borg s362sxe. Boost hits fast but the car runs out of steam about 6000rpm. Fun as hell around town though. Need to swap to a 3.5 diff.
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post #26 of 34 (permalink) Old 11-16-2018, 04:10 PM
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Originally Posted by Kris OK View Post
Humble Performance...that’s in Tulsa right?
I’ve got a .68 on my Borg s362sxe. Boost hits fast but the car runs out of steam about 6000rpm. Fun as hell around town though. Need to swap to a 3.5 diff.
Yes, Tulsa.

I've got the 3.58's and they are a total transformation. Highly recommended.

Here's a pic of my setup.
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post #27 of 34 (permalink) Old 04-25-2019, 09:44 AM
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Update

Since my earlier post with 363whp, I have gone to E85, and an .81 hot side housing. The results were 403whp. After that I brainstormed and came to the conclusion that the intercooler that I started this build with was entirely too small, 575cfm. I have since swapped to a Mishimoto 1075cfm unit and went back for more dyno. This resulted in 447whp and the car is totally transformed. Looking at the pre and post graphs, the larger IC is good for around 60HP across the board. I'm pretty happy with how the car is performing now. Next will be stickier tires as the car struggles through third gear with traction issues.
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post #28 of 34 (permalink) Old 04-25-2019, 09:56 AM
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Nice setup! What boost and timing is making 447?

I'm at ~490 with 17-18psi and 16º timing on a 60/40 blend of pump93/pumpE85

Traction in 3rd is definitely a problem, even on 275/35-18 MPSS tires...
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post #29 of 34 (permalink) Old 04-25-2019, 10:13 AM
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Wow, something is amiss then because my timing is a few degrees higher than yours and it was at 22psi. I'm currently at 66% Ethanol. I'm not aware of anybody with vast 2J tuning experience here in Tulsa, as this was done by Alex Pagan at Humble, and they specialize in Honda's.
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post #30 of 34 (permalink) Old 04-25-2019, 01:32 PM
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Quote:
Originally Posted by akarilo View Post
Wow, something is amiss then because my timing is a few degrees higher than yours and it was at 22psi. I'm currently at 66% Ethanol. I'm not aware of anybody with vast 2J tuning experience here in Tulsa, as this was done by Alex Pagan at Humble, and they specialize in Honda's.
Re-reading my post, I'm afraid I may have come off as criticizing your setup, or suggesting mine was better than yours. Not my intent!

The diff between ~450 and ~490 is pretty meaningless considering different dynos on different days, etc. All that matters is it runs well and makes you go tire shopping because you can't hook 3rd gear!
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