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Old 07-08-2002, 04:24 PM   #1
Blue_2K2_WRX
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Default How much boost can you run on a stock WRX?

A stock 2002 WRX.

With no tuning, or other mods just a boost controller.

Do you guys just turn up the boost and watch the egt's?

Or is there a known boost level you need to stay under.
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Old 07-08-2002, 04:26 PM   #2
MadWagon
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15psi is considered the standard, day to day, amount for a stock WRX.
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Old 07-08-2002, 04:28 PM   #3
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If you're completely stock then I would stick with the stock boost levels, i.e. 14.5psi max. If you go any higher, you run the risk of melting the cat in the uppipe. Also keep in mind that running higher boost without proper fuel management is asking for trouble. I've got a SBC-ID EBC and a Vishnu uppipe. I'm running 14.3psi max right now and couldn't be happier. I'm planning on eventually getting a Unichip and maybe pushing it up to 15.1psi.

Calvin
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Old 07-08-2002, 04:28 PM   #4
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Can I run 17 at the track. With no mods?
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Old 07-08-2002, 04:32 PM   #5
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As I said. . .you can run whatever you want, but at higher boost levels without proper fuel maps to match, you'll run high EGT's that could potentially melt the cat in the uppipe and send bits and pieces into the turbo and damage it. Personally, I would not run higher than stock boost levels at any time unless I was also running the proper mods to do so.

Calvin
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Old 07-08-2002, 04:35 PM   #6
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I have run up to 16.5/17psi before and IMHO it is just not worth going above 16psi. Depending on the weather(temp) and the gas you use(91-93-100race) anything from worse case (hot humid/91gas) 14psi to best case(cool mid humidity/100race gas) 16psi

As mentioned above 14-15psi for day to day use is good, 16psi for the strip/track ONLY if the conditions and gas are good.

I ran my best time (13.8@96.4) at 15psi with just a K&N and a TurboXS HP MBC.
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Old 07-08-2002, 04:40 PM   #7
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Quote:
Originally posted by cnk
As I said. . .you can run whatever you want, but at higher boost levels without proper fuel maps to match, you'll run high EGT's that could potentially melt the cat in the uppipe and send bits and pieces into the turbo and damage it. Personally, I would not run higher than stock boost levels at any time unless I was also running the proper mods to do so.

Calvin
I posted that right when you posted yours. Sorry didn't see it before i posted. Thanks for the info.
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Old 07-08-2002, 04:41 PM   #8
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Quote:
Originally posted by Nutter
I have run up to 16.5/17psi before and IMHO it is just not worth going above 16psi. Depending on the weather(temp) and the gas you use(91-93-100race) anything from worse case (hot humid/91gas) 14psi to best case(cool mid humidity/100race gas) 16psi

As mentioned above 14-15psi for day to day use is good, 16psi for the strip/track ONLY if the conditions and gas are good.

I ran my best time (13.8@96.4) at 15psi with just a K&N and a TurboXS HP MBC.
Is there any kind of calculator that I could use to figure out the octane I would need to run 16 or 17 psi at a certain humidity and temp? I plan on getting the up-pipe before I turn the boost up, just to elliminate one of the variables.
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Old 07-08-2002, 04:48 PM   #9
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No problem. I know that it's fun to run more boost. I just want to make sure that you know the consequences of running too much boost. If you're going to do something, do it right and do it carefully. Afterall, the last thing I want to see is a post about you toasting your turbo from a melted cat or blowing your engine from running too lean and overboosting.

Calvin
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Old 07-08-2002, 04:55 PM   #10
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What you are tring to do by using high octane gas is to reduce the chance of knock. Best advice is get a Knock-Link setup and monitor it when doing runs, there is no calc to work this out.

If you want to run high boost then if they sell 100 unleaded gas at your track get there with little or no gas in the tank and fill 1/2 tank (6-7gal) of 100. If you have to get it else where then plan to arrive with 1/3 - 1/2 a tank of same 100 octane gas. You can not run your car dry, there is always about a galon of un-useable gas in the bottom of your tank so if you put in 6 gal of 100 on top of 2 gal of 93 you will end up with a mix of 98.25 that should be good for 15-16psi.

BUT ! do not think higher boost = more power, with little or no mods the stock turbo can make more power with less boost then some people think.
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Old 07-08-2002, 05:11 PM   #11
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I don't know if they have 100, but I do know they have 104. At The Texas Motorplex. Should I just use this? More octane won't hurt will it?
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Old 07-08-2002, 05:50 PM   #12
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As long as its Un-Leaded its OK, however prolonged use WILL burn-out your O2 sensor's. But you should be OK with just using it at the track once or twice a month. Just put in only what you need, dont fill the tank for the week.
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Old 07-09-2002, 06:17 AM   #13
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Default Fill me in.

Why will the higher octane mess with the O2 sensor?

San
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Old 07-09-2002, 12:40 PM   #14
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Default Re: Fill me in.

Quote:
Originally posted by oldmansan
Why will the higher octane mess with the O2 sensor?

San
I too would like to hear this answer. I think it sounds like bull shizznit.
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Old 07-09-2002, 12:53 PM   #15
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Based on the info I got w/my Vishnu Stage 0 MBC, the stock WRX has a fuel-cutoff if the ECU detects boost (constant?) over 17psi. Someone correct me if this is erroneous info.

Stephen
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Old 07-09-2002, 12:59 PM   #16
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I believe you are correct about boost levels above 17psi. Don't know if the Unichip allows you to go higher though. I think the ABC only allows up to 17psi anyways, so it may be a moot point.

Calvin
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Old 07-09-2002, 11:33 PM   #17
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Higher octane won't hurt as long as it's unleaded gasoline. Don't use leaded or aviation. Lead will hurt the O2 sensor and cats.
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