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S5 13bt Stock Turbo 8 psi [email protected] 235tq

Old 08-24-15, 09:25 AM
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S5 13bt Stock Turbo 8 psi [email protected] 235tq

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Old 08-24-15, 12:07 PM
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276whp...on the stock turbo...at 8psi. How? I have to assume the dyno calibration is way off.
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Old 08-24-15, 01:18 PM
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We were all pretty surprised. I'm thinking this engine has a street port, but I am unsure. It was an imported engine. Running a haltech sprint re, fmic, bosch 1600 secondaries, and these were all 3rd gear pulls. Not sure if it makes much difference. The guy running the dyno said most people get lower numbers than they've seen on other dynos.

Also the boost was fluctuating from 8 to 10 and down to 6 towards the end of the pull.

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Old 08-26-15, 06:16 AM
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hope you got a partial refund for the dyno miscalibration, because those numbers are impossible. that or you have an upgraded turbo and didn't notice.

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Old 08-26-15, 07:32 PM
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Originally Posted by Lyger View Post
hope you got a partial refund for the dyno miscalibration, because those numbers are impossible. that or you have an upgraded turbo and didn't notice.
You think those are impossible even at 10psi? Its definitely the stock turbo.
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Old 08-26-15, 07:58 PM
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S5 13bt Stock Turbo 8 psi [email protected] 235tq

Originally Posted by Fuhnortoner
You think those are impossible even at 10psi? Its definitely the stock turbo.
These cars have been around for 30 years, if it were possible you wouldn't be the first.
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Old 08-27-15, 06:51 AM
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Originally Posted by Fuhnortoner View Post
You think those are impossible even at 10psi? Its definitely the stock turbo.
definitely impossible even at 10. at 14 maybe, if all the stars in the universe aligned.

every once in a while you see a miscalibrated dyno, i've even seen one person here who actually thought he made 315whp with a stock turbo... nope, never gonna happen.

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Old 08-27-15, 09:06 AM
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Very disappointing.
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Old 09-15-15, 08:39 AM
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315, no, but 276whp is very possible. the boost dropping at redline is either caused by backpressure pushing the wastegate open, or you have maxed the compressor and it just cant flow anymore air (usually around 250-270whp). probably the later. If you tried turning up the boost it would just make more torque, in this case boost has nothing to do with peak power. My TII made 250whp at 6psi boost, peaking at 14 or so and dropping toward redline as compressor reached its limit
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Old 09-15-15, 12:40 PM
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S5 13bt Stock Turbo 8 psi [email protected] 235tq

Here is my Dyno sheet. I have a rtek 2.0 with 720's secondaries, cork sport TID, street port, supra pump, and 3 inch exhaust at 7-8 psi. I wish I could of had 275 whp lol

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Old 09-15-15, 12:46 PM
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Old 09-15-15, 05:16 PM
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Originally Posted by gxl90rx7 View Post
315, no, but 276whp is very possible. the boost dropping at redline is either caused by backpressure pushing the wastegate open, or you have maxed the compressor and it just cant flow anymore air (usually around 250-270whp). probably the later. If you tried turning up the boost it would just make more torque, in this case boost has nothing to do with peak power. My TII made 250whp at 6psi boost, peaking at 14 or so and dropping toward redline as compressor reached its limit
Pulled the turbo and found a fat *** exhaust leak between the manifold and block. I already bought fresh gaskets. just need some time and im gonna fix her right up.
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Old 09-16-15, 02:16 PM
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Originally Posted by FC3S_nataku View Post
Was that with a front mount?
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Old 09-16-15, 03:29 PM
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Originally Posted by SpikeDerailed View Post
Was that with a front mount?
no that is with the stock s4 TMIC
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Old 09-17-15, 06:12 AM
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Originally Posted by gxl90rx7 View Post
315, no, but 276whp is very possible. the boost dropping at redline is either caused by backpressure pushing the wastegate open, or you have maxed the compressor and it just cant flow anymore air (usually around 250-270whp). probably the later. If you tried turning up the boost it would just make more torque, in this case boost has nothing to do with peak power. My TII made 250whp at 6psi boost, peaking at 14 or so and dropping toward redline as compressor reached its limit

so you're gonna tell me your car made 250whp while at that power on the graph the turbo was only pushing 6psi of manifold pressure? with a stock turbo?

nope, also not gonna buy that one either. sorry to break it to ya but again but either not reading the numbers right or you were on a broken dyno.


well, i shouldn't say impossible. perhaps with a peripheral port and if the turbo was modified to magically support the airflow.

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Old 09-17-15, 05:59 PM
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Originally Posted by Lyger View Post
so you're gonna tell me your car made 250whp while at that power on the graph the turbo was only pushing 6psi of manifold pressure? with a stock turbo?

nope, also not gonna buy that one either. sorry to break it to ya but again but either not reading the numbers right or you were on a broken dyno.


well, i shouldn't say impossible. perhaps with a peripheral port and if the turbo was modified to magically support the airflow.
what do you think happens to manifold pressure when you outflow a compressor? At the time i had 3" cold intake, 3" RB exhaust, not sure of porting, but i know it was either stock or mild rx7world streetport. stock S5 turbo. it ran mid 12's 1/4 mile

edit.. i think i had a frontmount ic too

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Old 09-17-15, 10:29 PM
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S5 13bt Stock Turbo 8 psi [email protected] 235tq

Well my Dyno sheet is pretty much that exact same set up, 3 inch intake and exhaust, s5 turbo and street port at 7 psi on a s4 t2 keg
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Old 09-18-15, 06:27 AM
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Originally Posted by gxl90rx7 View Post
what do you think happens to manifold pressure when you outflow a compressor?
i don't even know if that is a real question.

when you "outflow" a compressor the manifold pressure continues to rise but no more power is gained.

i don't know maybe your car was powered by magic too, your boost gauge was broken and you were really running 12-14psi, or your glasses were 5 prescriptions off.





i have run these stock turbos on stock ported engines, fully bridge ported engines and street ported engines of just about every configuration imaginable and i'm just gonna say it one more time. [email protected] on the stock hitachi HT18s is impossible, no matter what RPMs you do it at, if we could find a airflow graph for the turbo then i'm sure half a dozen turbo experts could tell you the same.

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Old 09-18-15, 07:17 AM
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Originally Posted by Lyger View Post
i have run these stock turbos on stock ported engines, fully bridge ported engines and street ported engines of just about every configuration imaginable and i'm just gonna say it one more time. [email protected] on the stock hitachi HT18s is impossible, no matter what RPMs you do it at, if we could find a airflow graph for the turbo then i'm sure half a dozen turbo experts could tell you the same.
but there is a spot for that on a compressor map.. in the lower right corner where turbo is over speed?

i dont know, i could be wrong.. i always thought the boost drop was a good indication of compressor out of breath. but it could have been wastegate getting pushed open by backpressure. either way, my brother ran his streetported S5 N/A with full exhaust back to back with mine and his only did 130whp, which seems low, if that is any indication of dyno accuracy
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Old 09-18-15, 12:07 PM
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if the turbine is outrunning the compressor to the point that the boost drops that isn't really a correlation of the turbo running beyond it's efficiency, that means the exhaust is drastically outflowing the intake tract.

i have had setups where this did occur, however power did nosedive with the drop in boost pressure until i put a larger intercooler in place, boost came up and so did power. oddly this was a major issue with a 6 port engine, the stock intercooler was causing a huge restriction for that configuration. boost would shoot to 12 the fall flat on its face to 7psi even with the wastegate virtually welded shut, once i put the front mount on it would hold 14psi perfectly fine and gained 50 horses with same 60 trim hybrid turbo. i physically inspected that intercooler upside down and sideways, there was nothing wrong with it either.

that issue had my scratching my head for days, because it seemed counterintuitive of how you'd expect a turbo to react.

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Old 09-23-15, 04:27 PM
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Originally Posted by Lyger View Post
if we could find a airflow graph for the turbo then i'm sure half a dozen turbo experts could tell you the same.
we do have one, although it doesn't show turbo RPM on it. however we do have some Garrett ones that are close that do have turbo rpm on them, and actually the shop manual has turbo rpm in it as well.

what happens is that the turbo is already spinning quite fast stock, and to flow more air it must spin even faster, which is why turbo life gets short, and why it just doesn't flow much.

this is also why the bigger compressor works, more air, less shaft rpm.
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Old 10-12-15, 08:50 AM
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Heading back for a tune at 12psi on friday. Ill make sure the dyno is calibrated correctly this time, and ill be back with the results.
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Old 10-15-15, 03:09 PM
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Originally Posted by Fuhnortoner View Post
Heading back for a tune at 12psi on friday. Ill make sure the dyno is calibrated correctly this time, and ill be back with the results.
Looking forward to hearing the results of it this time.
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Old 10-16-15, 04:17 PM
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[email protected] psi. I dunno wtf is going with my turbo. Maybe my ebc settings from my haltech? The boost is dropping bad. Set the haltech map switch to 10.1 on, and 10.0 off. Would boost to 10 and drop to 6 for the first couple runs. Then it wouldn't boost past 3.

I've already had my turbo off. No cracks is housing or manifold. I'm just tired.....
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Old 10-20-15, 07:51 PM
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That's not a typo eh? 197 (whp?) @ 3psi???

Still tho... :S
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