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Old 09-19-2002, 12:20 PM   #1
nicktckhoo
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Question How much heat does the stock turbo generate at 16.5 psi

Guys,

Is the stock turbo very inefficient once the boost is turned up? I mean at about 16.5 psi and no higher.... I am targeting about ~310HP with stock injectors and turbo because I don't want to risk damaging the drivetrain.

I guess my question is : for 310 to 320 HP (crank) is it really more reliable to upgrade the turbo or just stick with the stock one?

Thanks

Nick
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Old 09-19-2002, 12:26 PM   #2
jmott
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Default Re: How much heat does the stock turbo generate at 16.5 psi

310hp with the stock turbo is exactly the sort of thing that WILL damage the drivetrain.

its not just more reliable to upgrade the turbo for that much power, its pretty much necessary.



Quote:
Originally posted by nicktckhoo
Guys,

Is the stock turbo very inefficient once the boost is turned up? I mean at about 16.5 psi and no higher.... I am targeting about ~310HP with stock injectors and turbo because I don't want to risk damaging the drivetrain.

I guess my question is : for 310 to 320 HP (crank) is it really more reliable to upgrade the turbo or just stick with the stock one?

Thanks

Nick
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Old 09-19-2002, 12:49 PM   #3
Kha0S
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Especially on stock injectors. Can we say "lean run condition" ?

/Andrew
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Old 09-19-2002, 01:00 PM   #4
phxscooby101
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There's know way you can max out the stock injectors with stock turbo, not enough cfm. You'll det before that from the heat produced.

I agree it's easier too produce the 310 figure with a upgraded
turbo, but you'll also run lean if you don't upgrade the fuel
system.

And sticking with the stock turbo will make you less likely too
break the drivetrain, since it's not a big torque producer like an
upgraded turbo. just my 02cts later
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Old 09-19-2002, 01:01 PM   #5
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Quote:
Originally posted by Kha0S
Especially on stock injectors. Can we say "lean run condition" ?

/Andrew

there hundreds of wrxs making that power on stock injectors and I haven't heard of one yet that broke due to the injectors not providing enough fuel.

Ive heard of plenty of broken engines from cranking up the stock turbo too high tho.
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Old 09-19-2002, 02:51 PM   #6
nicktckhoo
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ok,

I understand that when too much boost is required of the stock turbo, the heat produced will be too great, whereas with an upgraded turbo, the turbo will run cooler. This means less detonation and ability to handle even more boost.

How much HP (crank) then is the reliable HP one can crank out with a stock turbo. That's because I am going to get my car tuned at turboxs in a month and want to get the best mods in place.

Cheers

Nick
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Old 09-19-2002, 03:27 PM   #7
davidm_sh
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Do a search on WRX1 username. He has done pretty extensive testing/observation of a stock turbo and pre/post intercooler temps. IIRC he saw around 260F coming out of the turbo on a long 4th gear pull on a 90'sF day. I believe that was with a MBC at around 16-16.5psi.

To put it in contrast I have seen about 260-270F on my VF22 @ 18psi up here at 6000ft. on 90F day as well. But my turbo is working 20% harder than it would at sea level as well. I don't feel quite so bad since I road in an old S4 with a T3/T4 turbo running about 1.2bar and on a 1,2,3 gear pull the turbo outlet temps got up to about 260-270F as well.

But I REALLY doubt you will beablet to get those kind of hp numbers at 16-16.5psi on the stock turbo. Now maybe on a VF30 you could .
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Old 09-19-2002, 03:29 PM   #8
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about 280 at the crank. or around 220 at the wheels. Good for around 13.4 in the 1/4 mile.

you can get a bit more if you push it.


Quote:
Originally posted by nicktckhoo
ok,

I understand that when too much boost is required of the stock turbo, the heat produced will be too great, whereas with an upgraded turbo, the turbo will run cooler. This means less detonation and ability to handle even more boost.

How much HP (crank) then is the reliable HP one can crank out with a stock turbo. That's because I am going to get my car tuned at turboxs in a month and want to get the best mods in place.

Cheers

Nick
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Old 09-19-2002, 03:41 PM   #9
z&cobb
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Quote:
Originally posted by nicktckhoo
ok,

I understand that when too much boost is required of the stock turbo, the heat produced will be too great, whereas with an upgraded turbo, the turbo will run cooler. This means less detonation and ability to handle even more boost.

How much HP (crank) then is the reliable HP one can crank out with a stock turbo. That's because I am going to get my car tuned at turboxs in a month and want to get the best mods in place.

Cheers

Nick
A better intercooler helps with the thermal effects of the 16.5 psi too. So the stg 2 with the TMIC and uppipe should be safer at 16.5 psi than the regular stg 2 while producing more power from the stock turbo. But I guess that remains to be proven on the Dyno.
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Old 09-19-2002, 04:46 PM   #10
nicktckhoo
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Indeed, I just install a BPM TMIC so hopefully, I will be able to run 16.5 psi on 93 Octane all day long without worry about detonation. I suppose I will leave the guys at turboxs to dyno tune my setup with the new UTEC. but thanks, I just didn't want to push the limits of the stock turbo without a safety factor for detonation.

Thanks

Nick
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Old 09-19-2002, 04:57 PM   #11
IgotWRXed
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if you dont already, get an uppipe. thats usually good for a drop of 1-200 egt degrees.
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Old 09-19-2002, 05:14 PM   #12
nicktckhoo
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Ya,uppipes are great. I installed one quite a while ago.

How about FP turbos? No one mentions them nowadays. Don't they retain stock drivability yet allow more flow?

Cheers

Nick
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Old 09-21-2002, 09:32 PM   #13
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You are gaining some additional power at the expense of added inefficiency. You can't just clip a turbo and expect it to simply behave as a similar turbo, only slightly bigger. It behaves as a slightly bigger turbo that is slightly less efficienct for it's given size. It is a more cost effective approach though.
I have done similar testing on pre/post IC temps on stock turbo. The turbo will pump out up to 300+ F temps given high boost (1.2) and tuning (Link). I did this during my design and trials for splitter and spray kit. The stock TMIC will go away pretty fast at that level.

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