don't know where else to put this - SRT Forums

Brads neon SRT4 · 10-16-2009, 08:31 PM

I'm having problems keeping my a/f's down below 16. at idle it was perfect. (11.3) after one test run, (one block wot) it's back up to 16/17! wtf! my fuel pressure is only at 25lbs on the fpr.

Apexi afc neo
750cc inj.
walbro 255 L/hr fuel pump
AGP return line
AEM eugo
Hahn 20G turbo
Hallman MBC (not that that matters)

The fuel map has the fuel all at +25 to +15 on both high and low throttle.

What am I missing?

cokey · 10-16-2009, 09:06 PM

hard to understand a bit, well prob for some.. what's your afr's at idle? are they at 16 or 11.3?

scox1026 · 10-17-2009, 05:50 PM

your fuel pressure is most likely the problem, im pretty sure it needs to be at least 43.5 psi base pressure for those injectors, but im no expert..

Brads neon SRT4 · 10-17-2009, 06:34 PM

at idle it's 11.3 - 11.2. Then i ran a block at wot, and now it idles at 16.8 17.9.. I am going to try my fuel pressure first... see if that helps....

dansrt4 · 10-17-2009, 07:15 PM

fuel pressure needs to be atleast 40 man and you cant ADD fuel with the fuel controler only pull....set the fuel pressure to 44psi and have the line on the back of the reg to a BOOST ONLY SOURCE.....OR you could set it static at like 42-44 and im 99% sure AGP has a map for that or they do with the dtec or used to one or the other....basicly on your low side you will be pulling 17-22% but dont go more then 25%

Brads neon SRT4 · 10-17-2009, 07:22 PM

yup just did that. set fuel pressure to 44 psi (plus/minus a pound) it's hard to read that fpr on the agp return line since it's so far under the front cowl. but I did that, and pulled more fuel.... I'm around 24% on the low side and 15% on the high... when i push the gas it's running at 10.3 which is lean correct? (i'm assuming i need to not pull so much fuel on the low side)I want my fuel where? 11 to 13? also, when i let out of the gas, it spikes at 16 but INSTANTLY comes back to 11 at idle. is this normal?

JoHnNysSRT4 · 10-18-2009, 02:06 AM

What afr should they be at idle for a stock turbo bolt ons nothing big?

slim26 · 10-18-2009, 02:14 AM

14 to 15 at idle

SpecJ · 10-18-2009, 07:18 PM

omg. this is soo painful to read. A/F at idle needs to be 14.7. Your shit is so fucked right now that the PCM can't adjust for itself. Why is your fuel pressure at 25? Set it to 45psi at a base, reset your PCM and it will idle fine, then bring your car to a professional and have it tuned.

Brads neon SRT4 · 10-18-2009, 07:43 PM

SPECJ, if it's painful to read, stop reading. This site is for people to learn from others... why take it to a professional if i have all the tools to do it myself? We bought NEONS because we have a very limited budget. (well, atleast some of us did. hence, i don't have the loot to take it to a "professional")

I came here for help, if you don't want to offer any, go read another thread. Guess what... there are people out there who started out JUST LIKE YOU knowing NOTHING... how did you learn... i'm sure by watching others, or reading. Just like I'm doing. My PCM isn't "fucked" it IDLES fine.... I just had other questions on what the normal a/f ratio should be.

to everyone else who is trying to help me, THANK YOU VERY MUCH!

**1LAPSRT** · 10-19-2009, 02:23 PM

Quote: Originally Posted by Brads neon SRT4

when i push the gas it's running at 10.3 which is lean correct?

The higher the number the leaner you are....

Hence 14.7 at idle is a bit lean, but since the car is not being pushed hard at idle, no damage. At WOT you should be in the 11's - 12's for most tunes.

If you are at 16 at WOT, your car is about to explode, pull over and grab a fire extinguisher!

Brads neon SRT4 · 10-20-2009, 02:08 PM

Quote: Originally Posted by 1LAPSRT

The higher the number the leaner you are....

Hence 14.7 at idle is a bit lean, but since the car is not being pushed hard at idle, no damage. At WOT you should be in the 11's - 12's for most tunes.

If you are at 16 at WOT, your car is about to explode, pull over and grab a fire extinguisher!

THAT'S what i was looking for! thank you.

Brads neon SRT4 · 10-20-2009, 02:09 PM

when i hit the gas it runs around 10.5 to 11.3. so I should be good eh?

**1LAPSRT** · 10-20-2009, 02:14 PM

Quote: Originally Posted by Brads neon SRT4

when i hit the gas it runs around 10.5 to 11.3. so I should be good eh?

Nice and safe.....

Brads neon SRT4 · 10-26-2009, 08:30 AM

I'm now getting a P0108 code.... Map sensor high?

Does this mean I need the 3 Bar map sensor? or is there something wrong with the fuel?

When i get this code, the car goes limp, and it's normally around wot....Boost is at 18 if that matters for this code.

Is there anyone out there that tunes cars at your home?