New to Sr20 with No0bish Boost Q

[Two-Fortee]

Hey guys, just picked up my 2nd s13, first was ca18 powered.

On the SR, its just front mount, BOV, 3" exhuast, and intake. Stock 94 s13 Blacktop, stock fuel pump and injectors (i think), stock turbo (t25).

Right now I can tell its running rich, I can smell it sometimes, and it backfires every now and then. By my question is,

I'm getting a MBC in a couple days and I was wondering how much boost I can run safely with this setup? I wasn't looking for anything crazy. Maybe 10psi day to day and 12 if I 1/4 mile it. I'm not too worried about leaning out since I'm running rich. Thanks for any help guys.

- Jared.

ps this is all untuned.

[speedeast]

Draw through or push through MAF? recirculated?

[Two-Fortee]

huh? I think you lost me. If you mean the BOV its blitz, it doesnt recirc.

as for the MAF, I didn't know their was a difference. Its stock.

[speedeast]

Ok, is the turbo sucking air from the MAF, or is it pushing air through the MAF?

[Two-Fortee]

sucking. The maf is right behind the air filter

[speedeast]

With it drawing through the MAF and it not being recirculated, it WILL run rich anytime the BOV operates. It's not a big deal on stock boost, but if you up your boost, consider recirculating or setting it up to push through.

[Two-Fortee]

Yea I understand that part of it, but I want to know how high I can turn my boost up and still run safely.

[speedeast]

Also, check to make sure your injectors are right and test them to make sure they're good. When they're bad, or when a resistor goes bad, the can tend to dump more fuel. There's a million possibilities, but there are little things you can do to narrow it down and get the most out of it.

[speedeast]

I've seen some people run a lot more than 10-12 lbs on stock setup... Just tune it accordingly. You will want to upgrade your fuel delivery for the best results - pump & injectors.

[Two-Fortee]

Yea I'm not worried about that right now though I want to know how much boost I can run safely on my set up lol

[speedeast]

10psi safe - anything more and you'll want to start upgrading stuff: maf, injectors, etc...

[Sugar]

Just get a wideband and you wont have to worry about it. Its your motor, but every car is different. I wouldn't just trust someones word on the internet who has never seen your car.

Uego is $199 and takes 20 minutes to put in.

[Blown240sx]

12 psi can be done fine without tuning on the stock T25. The factory SR map is already rich and doesnt add much timing. 12 psi is the MAX you should run on a t25, above that its just extra wear on the turbo and hot air.

If you upgrade turbos then look into injectors and tuning.

[PyR0NiAk]

12 psi can be done fine without tuning on the stock T25. The factory SR map is already rich and doesnt add much timing. 12 psi is the MAX you should run on a t25, above that its just extra wear on the turbo and hot air.

If you upgrade turbos then look into injectors and tuning.

With it drawing through the MAF and it not being recirculated, it WILL run rich anytime the BOV operates. It's not a big deal on stock boost, but if you up your boost, consider recirculating or setting it up to push through.

He'll be fine not recirculating... He's the first I've seen on here in a while with a Blitz BOV that doesn't leak, though.

[CRyan]

True that.

I am running 9-10 psi on stock S14 SR, if that means anything. I also have no idea what my AFR is, but it doesn't sound intimidatingly bad through out the RPM. I have to stop there because of my side mount intercooler.

12 psi is right there at point break for the T25 though, if you have boost spike enough times, you'll start showing excessive wear within that turbo. The stock injectors on the S13 SR I did not think could handle the boost.

Also, there is a hatch in my area running 14 psi on stock turbo, injectors, everything except a front mount and BOV.

I call s***, but I guess thats "bench racing" too. . .

Just get some Deschtworks injectors, a Walbro 255 fuel pump, and a Z32 MAF along with a decent ROM tune and have the good knowing that your car is making more power without stressing any of your OEM parts. Just my opinion, though. WTF do i know.

[PyR0NiAk]

14 psi is fine as long as he doesn't boost spike. His turbo, obviously, isn't going to last as long as someone who's running 10-12 psi, but there are SEVERAL people who run 14 psi with no problems.

[Blown240sx]

trust me I ran my SR on stock everything except exhaust, intake and FMIC for about a year on 12 psi from the stock t25 and it ran plenty rich.

You have to understand the factory SR fuel map is REALLY rich as you push more boost. The A/F drops into the low 9s when you get far enough down in the map.

Factory SR Fuel Map


Sorry for the crappy image res.

[CRyan]

I never would have thought the stock injectors would have kept up. So you 2 are saying that 14 psi on S14 SR (with T28) is doeable on stock fuel management?

No I'm not trying to sound like a smart a** - Just seems to me the reading throughout nico differs. . .

BTW, great shot on the stock fuel map from NisTune. I can not WAIT to have the program.

[PyR0NiAk]

I don't know where the stock injectors run out using a T28... I just know the T25 won't max out the injectors at 14psi, and that's pretty much the end of where the T25 makes power... Most people on here have S13 SRs, and the ones that upgrade to a T28, usually follow that up with some 550s, a Z32 MAF, and a tune, so you don't hear of too many people really testing out their injectors against a T28..

In my opinion, power building should be done in the following order...

Fuel Pump
Injectors
Turbo
Cams

Your fuel supply should ALWAYS be first on your mind... This winter I'm already planning on 1000ccs for my setup because I'm pretty sure my 810s will run out before my GT3071 will..

[EnjoiNismo]

Im running 6PSI, i need to turn up

[TLP_280ZX]

interesting. i recently downgraded to T25 cause my T28 is done for and stock 6-7 lbs is killing me! lol. so i think ill be adjusting it to 10-12 PSI, im gonna do 10, 11, 12 pulls and see what i like. i like reliability.