TUNING OPINIONS: recent scan of teh GTP

[10sec]

dude, you're having some huge issues, you either

1. have a clogged fuel filter
2. have a leak of some type on a vacuum line(s) connecting to ur FPR
3. have a weak fuel pump
4. misc other fueling issues.

there is a non-tune related issue with your car, you should not be at 21ipw's with current mods on E10 fuel, no way. There is definitely a fuel system issue with that there vehicle, no doubt.

 

[Eagle]

Uh, why not? if inj duty is so high'l why can't the pw be high too?


So you're suggesting a fuel pressure prob?


New fuel filter, so maybe pump or fpr?


You make it sound so terminal. :wtc:

 

[10sec]

Well the IPW's are high because the injectors have to be open longer to get enough fuel in there, that could be because the fuel pressure isn't raising with boost, or the fuel pump isn't putting out enough. I know on my red car i had a crack in the rubber hose coming off the intake manifold, wasn't enough to effect idle but my ipw's were 21-22 on 93 octane. I thought something was up so i took a look around, found that crack, fixed it, and the ipw's dropped to 16-17 since the FPR was adjusting fuel pressure with boost. This is exactly what i see with your car, but it could be a weak pump too. Your car can't add anymore fuel cause those injectors are maxed and your only at 790-810 o2's which as you know is LEAN as hell. That's like high 13's low 14's AFR, and explains the large amount of kr you see. BTW it took you 18-19 seconds to hit 104mph

 

[Eagle]

I will chase down that vac line and seen what I can find.

 

[DanJ]

The Vacuum T coming off the LIM is awfully fragile as well.

 

[10sec]

VERY fragile, mine has a 1/2 can of rubber cement on it

 

[Eagle]

We just had it off too to do the LIM.... bet something is up there. Cuz it starts fine on cold days, etc... doubting the fuel pump could be the prob.

Lots of stories about the FPR going south in the winter too.... mine might finally be on the way out after 150k...

 

[PANDA]

I think the problem is you don't use
























Actually I looked over that scan yesterday and I was just like . It shouldn't be commanding 14.7 at WOT. It did this randomly also, but not throughout a whole pull and not every pull. Not only that, but the IPW seems very high for a car with those mods and with O2's at such low levels. I know you need a wideband to make sure, but im just basing this off my experience with narrow-band tuning. My on my 3.4 setup had a similar fueling issue (high IPW) after trying to figure it out for a while and replacing a few parts I finally sacked up and bought a new racetronics pump and rewire. My car ended up having a grand prix GT fuel pump installed :rollpicard:, so after the new pump and rewire my IPW went from like 21 to 17. I would check for any vac leaks and see if anything is obvious. Maybe check the fuel pressure and run a bottle of fuel injector cleaner through the tank. I would think about replacing the FPR, maybe fuel pump. The car has some miles on it so it might be about time to replace these anyway. I really think you opened up a can of worms by wanted to tune this thing, let the modding begin!

 

[Eagle]

HAHAHAHAH! Totally agree @ can of worms.

Can someone elaborate on injector pulse width theory for me?

Whats the "max"? where do you get concerned? where is ideal? And why to each of these?

I was looking at a new FPR just for maintenance's sake, its $40. Might just slap one on and see what happens.

PS- my scans from this morning show mid 19s @ WOT like 90% of the time...

 

[Bob Kazamakis]

Do it! Fpr, filter and look into a hotwire kit if it already doesn't have one. I think mine were at like 21-22 on stock injectors I lowered my shift points cause I was running lean at the very very top.

 

[Bob Kazamakis]

Walbros are only like $80 too

 

[PANDA]

HAHAHAHAH! Totally agree @ can of worms.

Can someone elaborate on injector pulse width theory for me?

Whats the "max"? where do you get concerned? where is ideal? And why to each of these?

I was looking at a new FPR just for maintenance's sake, its $40. Might just slap one on and see what happens.

Im not the one to sell you about injector pulse width, maybe james can write out a essay.

I think on a 3.4 pulley and stock injectors with IPW's at 20+ and such a lean O2 reading you should be concerned.

Buy a Gp-Sorensen fuel Pressure Regulator.

 

[Eagle]

I have a "spare" fbody hotwire kit and a walbro pump in the garage... fpr I can get at AZ....

In other news I'm up around 14* and <2* KR now...

 

[Eagle]

Im not the one to sell you about injector pulse width, maybe james can write out a essay.

Sounds good

I think on a 3.4 pulley and stock injectors with IPW's at 20+ and such a lean O2 reading you should be concerned.

Understandable

Buy a Gp-Sorensen fuel Pressure Regulator.

Thats what AZ carries

 

[Bob Kazamakis]

Do it. 150k it's probably pretty tired. People say the autozone gpsorenson fpr is good if not better than stock.

 

[Eagle]

I'll get that on the way home today. Should be easy enough to swap out...

 

[Bob Kazamakis]

Yea i think it's just a c-clip.

 

[TommyGloves]

Eagle - Do you have a fuel pressure gauge that you can hook up to the Schrader valve on the fuel rail? You should see ~45 with the vac line connected and the car warmed up at idle. If you pull the vac line off the FPR, it should jump t0 50psi.

Also, make sure you get parts for a 2000 GTP...not a 1999.

 

[Eagle]

HAHAHHAHA! :squintfu:

I don't have one, but maybe its time to get one... where's a good place to pick one up locally?

 

[02BlueGT]

It's easier to make fueling changes via p/e tables, but that's more or less for noobs. You were a noob, i had to tell you that Now start all over with a basic ZZP canned tune setup and build up from there.

I feel hurt ....but the ZZP tune I own is for NA... So i'll just start with a stock file and move from there

 

[Bob Kazamakis]

HAHAHHAHA! :squintfu:

I don't have one, but maybe its time to get one... where's a good place to pick one up locally?

I bought one at autozone and it's come in handy a few times.

 

[TommyGloves]

I bought one at autozone and it's come in handy a few times.

x2

I have one that you could use too if needed. (I have to make sure that I have all the adapters first. LMK)

 

[Eagle]

If AZ has one that's reasonably priced (<$50), I'll pick it up and test the pressure before I swap out the regulator.

 

[Bob Kazamakis]

It was like $20 if I recall. Does vacuum too which is why I bought it. The Catalina ran like shit so I tried tuning it by vacuum and turned out the carb was shot. 4bbl ftw now

 

[Eagle]

I have a vac gauge. But I do need a FP gauge and $20 is nuttin. Looks like I'll be getting one of those today on the way home.