Question about upgrades

[nfinkbe]

Hello everyone. I have a big 16g turbo that has been giving me some problems with boost creep. Yes i ported the hell out of it but to no avail. I've decided to go ahead and upgrade to a tial 38mm external wastegate and the slowboy cast manifold. My question is should i be able to run lets say 15-16 lbs on my current set up? I have rewired the stock fuel pump and will probably get a 190 fuel pump as well. I do not have any kind of fuel management yet, but i am saving up for dsmlink and injectors. I am just wondering if i will be fine for a while with this set up and what boost i can run safely. My goals for the car is around 300-350 awhp, but that is in the future. I am just sick of not being able to go full throttle because of the creep as well as my slipping clutch which will be replaced with a spec stage 2 or 3 when i put in the mani and wastegate. any help is appreciated

Thanks
Tate

 

[scottsee]

Tate,

Boost creep can be a PITA. Kevin Jewer talked about his problems with his old 14b in his tech pages. With any rewired fuel pump it is good practice to upgrade the fuel pressure regulator. keep in mind 2g rewired fuel pumps can overrun the 2g regulators too. There is speculation that 2g rewired pumps have more of a chance of over running the regulator then a non-rewired walbro. Sounds like your on the right track.. Good luck with everything, and get DSMlink as soon as you can..

 

[nfinkbe]

so even if i go with the 190 fuel pump i still have to get the fpr as well. i was under the impression that i could use the 190 without the fpr. guess i need to save some more money then . thanks for the help so far. if anyone else has any ideas or thoughts let me know.

thanks
Tate

 

[kenamond]

Hello everyone. I have a big 16g turbo that has been giving me some problems with boost creep. Yes i ported the hell out of it but to no avail. I've decided to go ahead and upgrade to a tial 38mm external wastegate and the slowboy cast manifold. My question is should i be able to run lets say 15-16 lbs on my current set up? I have rewired the stock fuel pump and will probably get a 190 fuel pump as well. I do not have any kind of fuel management yet, but i am saving up for dsmlink and injectors. I am just wondering if i will be fine for a while with this set up and what boost i can run safely. My goals for the car is around 300-350 awhp, but that is in the future. I am just sick of not being able to go full throttle because of the creep as well as my slipping clutch which will be replaced with a spec stage 2 or 3 when i put in the mani and wastegate. any help is appreciated

Thanks
Tate

I'm running 15psi on my FPB28 with a rewired stock FP and stock FPR. I'm leaning out past 6k rpm, so I just don't go there. I'm not sure if the big 16g outflows the FPB28 at 15psi or not, and I'm at 7500ft elevation which changes the pressure ratio - my 15psi boost isn't the same as your 15psi boost...and I'm too tired to do the simple math to see if that raises the pressure ratio or lowers it. If my 15psi is like 17psi at sea level, and the big16g flows about the same as the FPB28 at that boost level, then you might *just* be okay w.r.t. fuel, but if my 15psi is like 13psi at sea level *or* the big16g outflows the FPB28 at this boost level, then you might hit the stock fuel system limit.

And all cars are different.

I hope that made sense.

Best way to find out is try with a logger.

 

[scottsee]

so even if i go with the 190 fuel pump i still have to get the fpr as well. i was under the impression that i could use the 190 without the fpr. guess i need to save some more money then . thanks for the help so far. if anyone else has any ideas or thoughts let me know.

thanks
Tate

No, you don't have to. The factory STFT's and LTFT's will compensate the fuel trims for you. It's just good practice to have stable, perdictable fuel delivery. If you can afford it, do it, if not, it 'shouldn't' cause to much instibility.. At least not enought to notice.. When you get dsmlink you'll understand...

 

[XakEp]

Do it right the first time, so you dont have to spend money down the road doing it right again. Get a FPR in there, get a good fuel pump and consider it money well spent.