How high can we boost

Jessie55 · Jan 16, 2008, 04:46 PM

who is boosting the most and does anyone know exactly what our engines limits are as a stock block....i can vaguely recall this in another thread and i think i heard safe 8 psi but i don't remember....

k3lv · Jan 16, 2008, 04:52 PM

Chowetime in australia runs 10-12 psi daily I think. RRM runs at 7PSI. I think anywhere between 8-10PSI is safe. I'm hoping some of the PR guys down south will soon talk about some of their work done to this car.

**otter** · Jan 16, 2008, 05:10 PM

I think one of the PR guys was running 13 daily, but he was nervous about it. Upgrading pistons and installing headstuds can greatly improve the car's ability to handle boost, though.

dsmjeffro · Jan 16, 2008, 05:17 PM

i would say def no more then 15 psi fully tuned & safe tune @ that

PR_Mivec · Jan 16, 2008, 07:03 PM

8.5 w/no mods
after a good gasket and studs 14 on stock internals and tunned

Jessie55 · Jan 16, 2008, 10:34 PM

well i plan to do more work to the engine to boost higher but for now after i finish getting the rest of the turbo parts in order i think i will boost 8psi any opinions or advice.......

mirage 4g93t · Jan 17, 2008, 05:01 AM

Quote:

Originally Posted by dsmjeffro

i would say def no more then 15 psi fully tuned & safe tune @ that

thats pretty high for stock internals..haha

Ralliart_on_LSD · Jan 17, 2008, 06:07 AM

On the stock RRM kit, its 7-8 psi (my boost gauge would go to eight, and keep a steady 7)

RRM sells a larger fuel injector, for the car to run 10 psi with a tune. Currently I am running 10psi, and when i make my next dyno appointment, going to 11. I have a dyno there monitoring everything, so it should be safe.

I would NEVER take it past 11psi without motor work. Unless i have a spare motor and/or spare car. This thing is my daily driver, no more expirements with this thing lol.

In short... 7psi all day, 10 with fuel.. 11 with a tune... 12-15 with a built motor...

How much PSI is the Turbo Tech PR ralliart running? I'd imagine somewhere in the 20's

Ralli-Evo · Jan 17, 2008, 06:13 AM

i heard recently that there is a company in Ontario Canada doing some crazy work with the current Ralliart's, supposed to blow away the competion, if my memory serves me the company plans on relesing the news of it's turbo kit soon, and how much boost they are safely running, should be interesting to see

-Dave

DClipse · Jan 17, 2008, 07:12 AM

I wonder which company that is. I never heard of anyone yet. Also, guys, depends on the turbo. 10psi on a 16G is something like 8psi on a T3T4 and I'm not sure about chowtimes, I think it's a T25 or T28 she's using, which again changes the numbers. The best way to measure, since people are running different setups is whp. Thunder rush in PR's got close to 300whp on stock motor.

Ralli-Evo · Jan 17, 2008, 08:56 AM

Yeah i heard of that, i will try and find out who the company is, i heard they will offer 3 levels of performance, just can't remeber the name for life of me.....LOL i'll do some digging, aparently they solved the MAF issues as well and have had great sucess thier kit

-Dave

DangerousDan · Jan 17, 2008, 09:33 AM

Quote:

Originally Posted by DClipse

I wonder which company that is. I never heard of anyone yet. Also, guys, depends on the turbo. 10psi on a 16G is something like 8psi on a T3T4 and I'm not sure about chowtimes, I think it's a T25 or T28 she's using, which again changes the numbers. The best way to measure, since people are running different setups is whp. Thunder rush in PR's got close to 300whp on stock motor.

you're gonna have to explain that to us a little better. 10psi is 8psi because you changed compressor wheels?

your spool-up may be different, in time and engine speed, but your pressure will be the same no matter what turbo you are running because it's set by the wastegate. that also means your HP will be the same between turbos at the same pressure, but the power curves will look different. you can't tell me that 8psi with XXX turbo will have more hp than 8psi with YYY turbo on the same exact engine setup. It's 8psi to the motor, the turbo just supplies the pressure. It's positive pressure, so the velocity will be the same. you'd have to change more than the turbo for the peak power to change.

Ralliart_on_LSD · Jan 17, 2008, 11:06 AM

The ONLY way to measure horsepower from turbo kits is dynos. But using the EXACT same dyno. My dyno could say 200whp, and yours could say 185whp, and his could say 210whp. same car, different dyno

DangerousDan · Jan 17, 2008, 11:58 AM

yeah, the dyno doesn't even matter though. his statement was that one turbo made 8psi and another made 8psi but it was "like the other turbo at 10psi." that's not possible, no matter what you are measuring with.

Punkskalar · Jan 17, 2008, 12:10 PM

Quote:

Originally Posted by DangerousDan

yeah, the dyno doesn't even matter though. his statement was that one turbo made 8psi and another made 8psi but it was "like the other turbo at 10psi." that's not possible, no matter what you are measuring with.

Yeah, I agree here, but different compressors can make the same pressure but put out completely different volumes of air... Something to consider...