want to be on 20psi SAFE!!

[bigfern60]

got i couple of questions... i have an 05 with cai, stage one ecu, sts, agp mounts. i just ordered a agp wastegate i want to be around 20 psi but i want to do it SAFE. i have heard that the stock fuel system is only good till 17 psi but there also people telling me 20 is fine i just want a couple of opinions from people. should i get a 3.0 map sensor? upgrade throttle body? keep i mind i dont want to get to serious with this car (right now) 20 psi is fine. i also ordered a ptp spring was wondering about that does anyone have one and r they worth it?

[NoisufnoC]

Quote: Originally Posted by bigfern60

got i couple of questions... i have an 05 with cai, stage one ecu, sts, agp mounts. i just ordered a agp wastegate i want to be around 20 psi but i want to do it SAFE. i have heard that the stock fuel system is only good till 17 psi but there also people telling me 20 is fine i just want a couple of opinions from people. should i get a 3.0 map sensor? upgrade throttle body? keep i mind i dont want to get to serious with this car (right now) 20 psi is fine. i also ordered a ptp spring was wondering about that does anyone have one and r they worth it?

do some research...you're going to get flamed for this post.

the stock fuel system runs out at about 18 psi, which is also the max the OEM MAP sensor can read. Get a wideband in the car to keep an eye on the AFR before you start messing with the boost.

DO NOT just throw a 3 BAR MAP sensor on the car. The S1 PCM is not calibrated to read on a 3 BAR scale so it will cause all sorts of problems.

I have no experience with the PTP spring, but the AGP WGA should be more than capable w/o it.

Just my 2 cents.

[lkni3010]

stock fuel system can do more in some cases... i have a stock 03 with stage 1 injectors and bolt ons and at 21-22 lbs my afr is 10.5.... thats rich as hell.. i need to get a dsp so i can take fuel out..

[bigfern60]

i just wanted to see if anyone had any first hand experience with the ptp spring but im not puttin it in untill later anyway. i did the research before the post but i had half people telling me 17-18 was cut off the the other half ^^ telling me 20-22 is fine so it was a little hard to follow but if anyone has any more input i would greatly appreciate it

[NinjamanSRT]

Quote: Originally Posted by NoisufnoC

do some research...you're going to get flamed for this post.

the stock fuel system runs out at about 18 psi, which is also the max the OEM MAP sensor can read. Get a wideband in the car to keep an eye on the AFR before you start messing with the boost.

DO NOT just throw a 3 BAR MAP sensor on the car. The S1 PCM is not calibrated to read on a 3 BAR scale so it will cause all sorts of problems.

I have no experience with the PTP spring, but the AGP WGA should be more than capable w/o it.

Just my 2 cents.

: The max that the OEM MAP can read is actually 17.5psi. and anything above that can yield an overboost code. Honestly, the best thing to do (for maximum tunability) is to make or buy a return line with a nice AFPR (Adjustable fuel pressure regulator). After that, investing in a Diablosport Predator and a GM 3BAR MAP will help out tremendously. (This is the expensive route). The cheap route would be to buy a MAP clamp (after you invested in a return line) and tune it with a wideband.

Hope this helps. And like the mod said... Do some research!

[NoisufnoC]

Quote: Originally Posted by NinjamanSRT

: The max that the OEM MAP can read is actually 17.5psi. and anything above that can yield an overboost code. Honestly, the best thing to do (for maximum tunability) is to make or buy a return line with a nice AFPR (Adjustable fuel pressure regulator). After that, investing in a Diablosport Predator and a GM 3BAR MAP will help out tremendously. (This is the expensive route). The cheap route would be to buy a MAP clamp (after you invested in a return line) and tune it with a wideband.

Hope this helps. And like the mod said... Do some research!

18.5 psi, but now we're just splitting hairs

i ran an AGP WGA and mapclamp setup on my stock pcm for a while w/o issue. make sure you get a wideband to monitor AFR and consider a scan gauge to monitor knock.

its good you have the stage 1, that way you wont need the tip mod to keep from popping cel's, since the car is 05

good luck, do your research, and be safe.

[NinjamanSRT]

I owned myself! Would you believe me if I told you that was what I was intending to type?

Quote: Originally Posted by NoisufnoC

18.5 psi, but now we're just splitting hairs

i ran an AGP WGA and mapclamp setup on my stock pcm for a while w/o issue. make sure you get a wideband to monitor AFR and consider a scan gauge to monitor knock.

its good you have the stage 1, that way you wont need the tip mod to keep from popping cel's, since the car is 05

good luck, do your research, and be safe.

[red04]

With your mods you want to stay around 15-16 psi hold and you will be fine. The stock turbo will not hold 20 psi of boost, it is to small. You can get it to flash that much but it will not stay there. You can't run the 3 bar sensors as the stage 1 is not calibrated for them, and you don't need them. If you want more out of the car there a couple of items that are very logical and very easy to install that will really wake it up. If you have any questions feel free to pm me.

[Dasstrum]

Yeah, a stock turbo on 20+ psi is running out of its efficiency range. At that kind of boost 20+ psi its just pushing very hot air.

[lkni3010]

the cold side of my front mount is always ice and im putting on meth... i do drop to 5 at redline tho. i spike to about 22 and my afr is 10.5 then i bleed to about 18 then 15 at redline. afr stays rich

[Dasstrum]

Quote: Originally Posted by lkni3010

the cold side of my front mount is always ice and im putting on meth... i do drop to 5 at redline tho. i spike to about 22 and my afr is 10.5 then i bleed to about 18 then 15 at redline. afr stays rich

Feeling the intercooler is not really a good way to measure how hot the air is. If its 20º outside and your moving at like 60 MPH of course its going to be ice cold. And also your not holding 22psi till redline, just spiking it

[lkni3010]

Quote: Originally Posted by Dasstrum

Feeling the intercooler is not really a good way to measure how hot the air is. If its 20º outside and your moving at like 60 MPH of course its going to be ice cold. And also your not holding 22psi till redline, just spiking it

just checking but doesnt my post say 15 at redline? and something about 18? and something about a spike?

[goblin42]

i was wondering about this post. worried about effects of it.
MOds: DSP 93
AGP intercooler.
S2 W/o toys.

right now my boost gage is pushing past the 20psi mark and holding till redline. i've reada lot of threads of ppl having the same issue. saying thier S1 and stock injectors were running way lean. but since i have S2 would that set me about right? i hear S2 runs way rich to begin with.

before ya'll ask . . . i dont have A/F yet. waiting on DP and AEM Uego.

[Dasstrum]

I ran 22 psi spike and holding 19 till red on stage 2 kit with PTP ported turbo for a long time.

My mods at the time was stage 2 and walbro 255. I had no problems with it. It did tend to want to go lean at the very top of the gear (around 5500 - 600) it would go lean like 12.3 but I also had 50/50 meth injection so that wasnt too bad.

Oh, and stage 2 runs rich is you dont turn up the boost much. Stage 2 has bigger injectors (682cc). If you dont have walbro 255, you should be fine running 18psi all day long with your setup.

Hell, I ran 17 psi on a 60 trim turbo with the stage 2 injectors and fuel return for a while after my stock turbo blew up and I still was staying around 12.0 AFR with injectors at about 85-90% duty

[Adionik]

Does anyone have any actual proof of the stock turbos inefficiency at 20psi? I always hear it and i'm sure it's true...but would just like some data to back it up