Recently all of a sudden a lost all boost from my car. It basically feels like stock now. I leave it in 2nd gear and ride till redline and it hardly pulls.. When everything was working right 2nd gear pulled hard and hell. I can hear the blower spinning. Everything looks fine. Car runs there are problems. Loose like 100miles on my tank of gas, smell of fuel from exhaust accompanied by black smoke. Rough idle when I'm stopped at a light. Rpm will drop then go back up to normal idle in "N" @ a light.

Any ideas?

 

looks like you're a leaking air somewhere. At full throttle what does your boost guage read? How bout idle?

 

Actually I checked now and the boost gauge doesn't even read any. like 2-4psi. I'm should like 9-10psi normally.. My EGT is high all of a sudden now too. Crusing @ like 70 it;s like @ 1250F. It's usually a lot lower then that..

 

besides loosing air check and see if your fuel pump is even connected before you blow some **** up.

 

I second that...
when my fuel pump was disconnected, the EGT raises hella fast and it reaches the 800c (1472f) limit before the red line @ 3rd gear. the aux pump will make a noticible buzz and you can tell when you turn your car off and it will continue to buzz for few second.

but when I am cruising at 70, 1250 seems to be the right tempearture.


1250f = 660c...that's still rich.


what do you have before?

 

Maxi didnt you also say your car did not pick up as fast if as far as I could also remember?

if your fuel is good check vacuum leaks if that fails at the end check your Y pipe as a last resort since the mid section weavey part might of collapsed on you causing your car to slow down dramatically and your EGTs going so high, that has happened to me so just passing the info.

 

At part throttle he should be in closed loop mode and running close to stoich. At any rate you're going to have lower EGTs cruising at part throttle, so he's not necessarily rich at 1250F. I usually see around 1150F cruising at 70 mph (3000 rpm).

 

Danny: what EGT reading did you have before? can you remember what did you do to your car before it went bad? I recalled you installed a fuel pressure gauge. was that installed correctly?



yes....I had that problem. When I had my 3.33 pulley, I couldnt really tell. But until I dropped in the 2.87 and boosted at 10psi/2nd gear. I know something was not right. It was not pulling at all and it just move forward like a normal car.

I ended up brining her to dyno and the AFR was shocking! 18:1!!!!! I think that was why my EGT was high all the time. Then Kevin i.d. the problem: one of the wire of the fuel pump was loose! After he hooked it back up, then the AFR went below 10:1 after 4000 rpm.

my dyno graph

now my EGT's better. Crusing @ 70 is about 650C and I can boost a lot longer and it raises really slowly. But if I just give her 1 - 3psi, it still goes up to 800 limit. I assume it is because FMU cannot detect small amount of boost, thus it is not activated.


now I am getting a fuel pressure gauge

 

I looked at my fuel pressure gauge and it does go up and down. So that means that the fuel pump is working right?

 

hmmm...ic. and you guys tapped your EGT on the manifold, eh?

if so...mine is still a bit high and mine's even tapped on the y pipe. I should get some cooling from the environment.

 

Mines tapped on the y.. Right after the pipes meet and make the Y.

 

I wondered about that myself, so I hooked up a Mityvac to the FMU and gave it a couple of psi, and the fuel pressure did go up. That was with the engine idling. But I have noticed the EGTs seem to go up faster boosting at part throttle compared to WOT. Could be the ECU trying to keep the AFR from getting lower than it thinks it needs to be.

 

I tried it today after work. Basically, if I boost by opening half of the throttle, it raises to the 800 c limit and I was boosting at 5psi. However, if I floor it, it only goes up to 720c, the most.

cruising at 70mph, I get 640c. pretty much the same to Danny (PCGuru2k)'s reading. but I am still on stock cat-back though.

 

Got a more accurate reading.. It basically ranges from 1150-1200 now..

 

its working but what PSI did you see? @ around 5 psi you should see from say 46-60PSI somewhere around there. I know with the stillen inline I saw 100PSI @ 10PSI