Here's my input to this subject. THe replacement or aftermaket injectors might have different resistance than the oe TGP injectors even though they have the same flow rating. That might be the cause of poor performance by those replacement units. And if you use low resistance (10ohms or lower than the TGPs--forgot what the TGP ohms were--listed somewhere in the TGP forums--)injectors, They might heat up and loose acuracy. The computer can drive high resistance injectors at full capacity. Those low ones will reach their full duty cycle very quick.

I had posted this somewhere else but here it is on the correct spot.

I ordered the 23lb accels.  I'll let everyone know how mine work out.

Cool!  Let us know.

I just put the 22lb Corvette injectors I won off of Ebay in and they fixed everything.  The car runs awesome now!  I paid $86 including shipping for 8 of them.  Now I have a few extras if needed.

Jason

So Jason...do you know what the part number is for those injectors. I would like to drop in new injectors on my TGP and $86-$150 sounds good to me! Especially if they are a direct replacement... 8)

There was no GM number on them, in fact there was only like a 3 digit number on them.  I won them in an auction.  I'd suggest to look for injectors on ebay, and ask people what their flowrate is.  Thats what I did.

Jason

IF i'm remembering my injectors right..

18 LB = 3.1 / 2.8 stock

22 lbs = 3.1 turbo

22 lbs = 3100 n/a

22 lbs = 3400 (not sure about this one, may be larger)

25 or 26 lbs on 3300

28 lb on 3800 engines


I may be wrong, but i was going to try to get my car to run with the 3.1 injectors and swap to a set of 3.3 liter injectors and see what happened.  

Probably  going to re-trim the pulse width in the ECM afterwards to get it to lean out at vaccum.

-- Lee

Quote from: eclipse5302There was no GM number on them, in fact there was only like a 3 digit number on them.  I won them in an auction.  I'd suggest to look for injectors on ebay, and ask people what their flowrate is.  Thats what I did.

Jason

Do all injectors have the same body design? These injectors you won you said you put them in...did you have to modify anything to make them attach to the injector rail?

the 2.8/3.1 NA injectors are rated at 16.7#'s IIRC


TGPilot, Ben Phelps used 19# Ford Mustang 5.0 Fuel injectors and they were direct fitment in his NA 3.1......also he said that they are rated higher on GM fuel injection and become around 21#'s, so possibly the 24# Ford Racing Mustang injectors or other higher rated ones will worK? anyone own a 5.0 and have these injectors to compare? :?:

Quote from: TGPilotDo all injectors have the same body design? These injectors you won you said you put them in...did you have to modify anything to make them attach to the injector rail?

Well, most of them use the same body design.  But usually the difference will be the length.  These just happened to be the right length.  They attached to the feul rail just like the old ones did, without modification.  The SyTy injectors are slightly shorter, like the 5.0 injectors, but the lower intake plenum is deep enough that the o-rings still seal.

Jason

What year/model Corvette did the injectors come from? Sorry for the redundant questions, but these injectors are direct replacements for the TGP as far as size? I am in need of injectors on my TGP and don't want to pay $100/ea for them... 8)

I would suggest these injectors if you could find a set.  I don't know what year they are off of.  The guy said they were TPI injectors for a Corvette, or Camaro.  I'm guessing they are for the HO 5.7 liter V8.  I'll try to do more research because I'd like an extra set.  I'll let you know.

Also, is that correct that the 3100 injectors are 22lb?  That sounds a bit big for a NA 3100--seeing how the 3.1/2.8 are 16-17 lbs, I can't imagine that the better flowing heads need that much more fuel.  But who knows...

Jason

3100 injectors are roughly around 17.6#'s according to Ben......there are a couple of threads discussing different injector flow rates on the GMF board.......I should know...lol.....when I first joined every board I skimmed through almost all the old post.......took me a while to get caught up too......never tried nor will I try to read everything at clugp message board though.

UPS dropped my injectors off last night  :D   I got 24lb in stead of 23.  It damn snowed last night so I don't when they are going in now :cry:

Just looking at what eclipse wrote, The 5.0 injectors, I have three sets of them. I happen to have a set of 24lb and 2 sets of 19lb injectors. I am looking to experiment with the 19lb to see if they will work with our setup. The guy who did Ben Phelps who did sucessfully use them had a NA 3.1. Eclipse this is directed to you or anyone who could shed some light on it. What are the pitfalls of such an experiment on the TGPs.[/quote]

Uhh, the 24lb/hr yes, the 19lb/hr NO.   The stock injectors are rated at 22lb/hr.  If you put 19lb/hr injectors in the car will run lean.  It's much better to run rich than lean...not much can break if you have too much gas.  Tons can break if you don't have enough.  So I'd say try the 24lb injectors, stay away from the 19s.

And BTW the 19s probably worked in the NA 3.1 becuase stock the NA 3.1 uses 16 or 17 lb injectors.  More is OK (although it may not run right--it all depends on if the ECM can compensate that much), less will be OK up until you gernade the engine from being too lean.  So give the 24lb injectors a try, but don't use the 19lb ones.  Also, get a new set of injector o-rings and lube them up good before install.  That way you won't have any intake leaks.

Jason