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Old 06-10-2003, 06:23 PM   #1
bryan2.5rs
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Default how much boost

how much boost can i run? i have a 2001 RS with stock engine and 8.5:1 forged pistons RRFPR and high flow fuel rails and a walbro fuel pump . All stock WRX turbo parts.
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Old 06-10-2003, 06:43 PM   #2
Eric SS
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You can run as much as you want. It might blow up though.

It is so much harder than just saying what components you have.
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Old 06-10-2003, 07:13 PM   #3
Turbo GC4
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you can run 159.7341 mmhg. that is an exact figure, I used a calculator. Using this formula

[ (8.5:1) X ] = 159.7341
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Old 06-10-2003, 07:36 PM   #4
bryan2.5rs
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how many pounds is that, and i don't want to blow it up again, thats why i have the new pistons.
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Old 06-10-2003, 07:44 PM   #5
Shinji N
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Well it's not a straight conversion. You have to weigh the monkey that he's using, but you'll have to catch him first!
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Old 06-10-2003, 10:24 PM   #6
CheezeWeezle
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oh boy.....I am trying to piece together my turbo options and as it is with a stock engine I can go no further than 5psi...I can go further if I want to blow up my engine though
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Old 06-10-2003, 11:16 PM   #7
Graham
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With the forged pistons you can probably max out the stock WRX turbo. I would say you could do around 14-15 psi on that turbo, but at that point the efficiency of the turbo is maxed beyond belief on the 2.5L motor. I would highly recommend upgrading your turbo. You should look at a VF-22 or a VF-30 IHI turbo, much larger than the WRX turbo, to really see the potential of the new fored pistons.

Did you blow your motor? Only new pistons or rods as well?


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Old 06-11-2003, 09:02 AM   #8
bryan2.5rs
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i was running 9 pounds on stock internals and blew the rings in cylinder number 4 however the car is still driveable i have been driving it for about a month, but it is getting worse I will be putting in the new pistons next week.
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Old 06-12-2003, 12:24 PM   #9
bryan2.5rs
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bump
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Old 06-12-2003, 07:42 PM   #10
spt_impreza
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which low comp pistons do you have?? thx

spt
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Old 06-13-2003, 06:51 PM   #11
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Run 17psi max as thats the limit of the turbine's effieciency...

If you want more power look into upgrading the compressor side and run the same 17psi...

If you want even more power, look into upgrading the whole turbocharger...If it were me, I'll go with a T3/T04e with a .63A/R on the Turbine with a Vtrim Wheel and a .70A/R Compressor with a 60-1 Wheel...

Zee
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Old 06-13-2003, 07:02 PM   #12
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THANX!
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Old 06-13-2003, 09:21 PM   #13
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Quote:
Originally posted by Shinji N
Well it's not a straight conversion. You have to weigh the monkey that he's using, but you'll have to catch him first!

OMFG This made me laugh so bad!
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Old 06-14-2003, 11:49 AM   #14
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Quote:
Originally posted by Turbo GC4
you can run 159.7341 mmhg. that is an exact figure, I used a calculator. Using this formula

[ (8.5:1) X ] = 159.7341

You're a MF trip, dude!
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Old 06-17-2003, 10:36 PM   #15
ImprezaRS dot com
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It also depends on what you are doing for timing control.

The 8.5:1 pistons may only let you run 10-12 psi with the 2001's ECU and stock timing advance, vs 5-6 psi with the stock pistons and stock timing advance. To run 13-17 psi you may need to retard the timing 4-6 degrees to avaoid detonation. Also, the TD04 is not be big enough to boost those numbers on a 2.5L, I would seriously look at a VF22 or something in that size.

We have a guy up here at 6000 feet with a 8:1 CR 2.2T block and he can only run 15 psi with his stock 1.8L ECU's timing curve and no timing controller, on 93 octane. He has to drop to 13 psi for 91 octane, and we can usually run 2-3 psi more up here than at sea-level. However, I am told the 1.8 ECU has more timing advance than the 2001 ECU.

Larry
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Old 06-18-2003, 11:46 AM   #16
ravent
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What rods are you using??? Remember, the chain is only as strong as the weakest link. What gas are you using? Do you have the "Squirt" from Crawford Perfomance (water injection)? They will be at Pikes Peak next week for PPIHC. Also remember that all it will take is "detonation" once at the right boost to end the life of "any" motor, so the tuning is the most important...not something to experiment with.

Almost forgot, what turbo are you using...this also will be important as to how much boost you can run. The "system" has to be built as a whole, not just some parts you bought ie turbo, pistons, rods, head bolts, gaskets, NOT just some parts someone said were good or were taken off anothers car.

Last edited by ravent; 06-18-2003 at 11:52 AM.
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