SAFC fuel problem

[Gottiboy]

1998 gst lots of mods but...
550cc
I have to have my safc turned all the way up to %30 just for car to idle and not run lean. I know with bigger injectors I should be in the negatives but car won't even run with settings even at zero.
Car also won't rev worth a dang up to around 2500 rpm. After that it seems to run good.any ideas?

 

[Gottiboy]

what size injectors would yall recommend??? my mods are
stock bottom end stock head with arp head studs
gonna run stock exhust manifold
pte 20g turbo wanna run 20psi max (for now until i get dsmlink update)
big fmic
greddy bov
apexi safc
black box ecu from 99 gst
AFPR
walbro 255
greddy boost control
and a very strange crankcase vent system

 

[Vegas Smith]

http://fuelinjectorclinic.com/hp-calculator

 

[lasershark]

Since you have the black box, you know you can use that to tune right?
It can save you some coin, look up dsm blackbox tuning. I am not very knowledgeable with black box tuning so searching will yield you better information than I can provide.

1. Just turn boost down a bit.
2. Get capability to tune.
3. Get bigger injectors and tune!!!
(Still need to get the wideband going)

 

[LarryJoe]

From the looks of it, that's not a 20g turbo. Probably a pte 50 trim variant but it's hard to tell from those pics.

 

[Gottiboy]

From the looks of it, that's not a 20g turbo. Probably a pte 50 trim variant but it's hard to tell from those pics.

I wish I could tell what it was. Just going off what the guy I bought it from told me with that part.

 

[Gottiboy]

Since you have the black box, you know you can use that to tune right?
It can save you some coin, look up dsm blackbox tuning. I am not very knowledgeable with black box tuning so searching will yield you better information than I can provide.

1. Just turn boost down a bit.
2. Get capability to tune.
3. Get bigger injectors and tune!!!
(Still need to get the wideband going)

I unscrewed the MBC almost all the way and I still hit over 20 psi in 5th gear. Is my waste gate stuck? How can I tell?

 

[Gottiboy]

Pics of my injectors. Don't know what the engravings mean. And there is no brand on them

 

[Dstarperformance01]

Have you rewired your fuel pump yet? The engravings are usually the part number. So how do you know they are 550 rc injectors?

 

[Gottiboy]

Have you rewired your fuel pump yet? The engravings are usually the part number. So how do you know they are 550 rc injectors?

I looked it up on dsmtuner search.
Guy said Lucas RC style 550cc

 

[Gottiboy]

Have you rewired your fuel pump yet? The engravings are usually the part number. So how do you know they are 550 rc injectors?

Rewire fuel pump??

 

[Gottiboy]

Have you rewired your fuel pump yet? The engravings are usually the part number. So how do you know they are 550 rc injectors?

 

[Dstarperformance01]

Okay rc style not rc's. Yes rewire fuel pump so it sees constant voltage. Go to resource section and look it up then see if po did it or not and was it done correctly?

 

[Dstarperformance01]

Yes those 550 will not be enough to run a lot of boost. Maybe 14-16? I wouldn't see anymore without fuel cut. I would say you need like 750's -850's for pump gas and even bigger for E85

 

[Dstarperformance01]

You will also need a way to tune other than SAFC because 750's are about at the safc capacity to tune effectively

 

[Gottiboy]

so my wastegate is deff stuck closed. any solutions?

 

[Dstarperformance01]

Stuck or welded? Take off linkage and tap the arm with a hammer and see if it frees up

 

[Gottiboy]

Stuck. I opened it by hand when I had the manifold off last weekend. Had to push really hard to open the flap

 

[Dstarperformance01]

Was linkage still connected? If so they are hard to open by hand

 

[lasershark]

Where is the boost source coming from for the wastegate actuator?

 

[Gottiboy]

I have not looked where the boost gage is T in at. I just to the electronic boost control off yesterday.

 

[Gottiboy]

I started playing with my safc while I was driving home on some back roads. Turned all the fuel levels to zero and the car runs better and takes more boost than ever. It's only at higher rpm (5000) it starts cutting out. O2 gauge showes full rich. I'm lead to believe I've been flooding it this whole time having the safc turned up. Because as soon as I set it to zero across the board it ran alot better under boost. Do I need to turn down my safc for higher rpm? I thought it was the other way around

 

[lasershark]

You are going to ruin something real quick if you keep running big boost on that 20g (or 50 trim?) with only 550's a safc and trusting a POS narrowband gauge. Narrowband gauges are not an accurate way of monitoring safe levels of AFR's. Cutting out at 5k rpms is probably your car detonating like a motha fu(ker. I am not trying to be rude and legitimately don't want your car to go KABOOM!

http://www.dsmtuners.com/threads/definitive-piggyback-tuning-guide.58403/
http://www.dsmtuners.com/threads/the-basics-of-tuning.111005/
http://www.dsmtuners.com/threads/how-the-safc-works.105569/

 

[Gottiboy]

You are going to ruin something real quick if you keep running big boost on that 20g (or 50 trim?) with only 550's a safc and trusting a POS narrowband gauge. Narrowband gauges are not an accurate way of monitoring safe levels of AFR's. Cutting out at 5k rpms is probably your car detonating like a motha fu(ker. I am not trying to be rude and legitimately don't want your car to go KABOOM!

http://www.dsmtuners.com/threads/definitive-piggyback-tuning-guide.58403/
http://www.dsmtuners.com/threads/the-basics-of-tuning.111005/
http://www.dsmtuners.com/threads/how-the-safc-works.105569/

i get it bro. really i do. and i promise that aem is going on the car today or tomorrow. and good looking out.

 

[Gottiboy]

You are going to ruin something real quick if you keep running big boost on that 20g (or 50 trim?) with only 550's a safc and trusting a POS narrowband gauge. Narrowband gauges are not an accurate way of monitoring safe levels of AFR's. Cutting out at 5k rpms is probably your car detonating like a motha fu(ker. I am not trying to be rude and legitimately don't want your car to go KABOOM!

http://www.dsmtuners.com/threads/definitive-piggyback-tuning-guide.58403/
http://www.dsmtuners.com/threads/the-basics-of-tuning.111005/
http://www.dsmtuners.com/threads/how-the-safc-works.105569/

Got the wideband AEM on. When I go into boost car goes full rich. Could these injectors have been reworked? How could I be so rich with such (small injectors)

 

[Gottiboy]

If I was maxing out the injectors it would be lean at high boost right?