The bottom line with these cars, is they use a **** LOAD of fuel PERIOD. My 2.6" pulley at 7000 rpm is drawing 75% duty cycle from my 60s!

 

If you have 100% IDC with 42#'s then you need to fix your tune. Log your commanded AFR next time.

 

Yes, you are correct the rail does not limit the flow in our cars.

Are fuel pressure is higher then most cars example my 1G eclipse turbo was running 42PSI of fuel pressure. Most injectors are rated at 40 PSI seems to be the standard fuel pressure normaly used.

That being said the STAGE 1 GM injectors are rated at 42# at stock SS/SC fuel pressure of 70PSI. the LUCAS 42# injectors are rated at 42PSI so pushing the LUCAS injectors at 70PSI will make them behave more like 50# injectors.

I have yet to see anywhere close to 100% IDC boosting at 17PSI at over 6500rpm with my 42# LUCAS injectos.

 

Thats because they have piston protection and COT and a 11.5 PE AFT and the PCM is trying to command like 9.5 to 1 AFR.

Then they log their car HPT with no WB02 and post this rediculous thread.

Spend some money, get a WB02, learn how your PCM works, them come back.

 

Also you didn't got a knock because you have a lean mixture, you have knock because you are running 17 PSI and 17 degrees of timing.

I have a 2.8 and and I barely hit over 15 PSI. IF you get a better downpipe/hi flow cat, you will drop intake pressure because the engine flows better.

 

I need HP tuners and a wideband like Rosie O'donnel needs spoons. Stupid Christmas. Stupid lack of tuners in my area. Unfortunately I can't learn how my PCM works without HP tuners. It's a good thing this forum is here to help and back me up with questions.

 

I guess I better through my 3.0 back on... I been running 2.8 for about 4 or so months now, and I go WOT all the damn time. I wonder how fucked up my car is... another reason to get an Aeroforce.

 

I have the 2.79 as well. WE'RE FINE.

 

... Yeah... **** it... I ain't changing ****. I don't know why GM didn't just go ahead and make Stage 2 60#ers. The only thing stopping me from getting 60 #ers is tuning. I have no way, no money for HPTuners right now, and wouldn't have the $$$ for a tune anyways.

 

You have to remember that your eclipse also has a rising rate fpr on it. Fuel pressure will go up with you boost. Higher fuel pressure will reduce your idc.


As far as the whole injector sizing issue. It depends on where you live and your temps outside. This is the whole reason on our pulley kits we recommend a 2.9 with the 42-44lb injectors. Then we recommend moving to a higher size up for anything 2.8lb or above. Now while for some of you going smaller that maybe fine for you while others it will not. Every car is slightly different. I can tell you though running high injector duty cycles is not good on any injector. It doesn't matter who makes it. You might be ok for a while but they do wear out extremely quick when they are abused. Who knows they may last 3years. What if after that time the injector gives out? An injector may not go static at first but as they wear and get more crap built up on them they tend to stick a lot easier. Do you really want to be sitting in your driver seat going damn if only I didn't put that pulley on or what if I would have paid for one size larger injector. As there is smoke dumping out of your engine bay. Yes everyone loves to push the limits of there car. Hell I do too. However something as simple as going up a size injector or going with a slightly larger wheel does not seem like a hard choice.

 

I want 60#'ers... but like I said... Tuning is the only issue... I don't have the $$$ to pay for a tune... and I don't know of ANYONE around here that can tune and LSJ. I'll probably throw the 3.0 back on just to be safe.

 

GM didn't throw in larger injectors because the kit was not made for that small of a pulley. They used the appropriate size injectors to run the correct duty cycle and provide a reliable upgrade solution for the everyday person that wants to tweak out there balt without some crazy tuning. We all like to push the limits of everything we bolt on our cars. Being turbo'd supercharged or na. Lets just remember that simple engine/sensor monitoring is a necessity when doing so.

 

I wish their Stage 3 was 60 #ers with a small pulley and the intercooler plate.

 

whatever ive put almost 6k miles on my stage 2+2.8 no problems here.

 

I am differrent I an getting a P103 code all of the time but I also notesed that my 1/4 time were slighly slower with the 2.8 on. 14.13 stage 2 and 14.3 with stage 2 and 2.8. Also I know that the new flash is suposed to take car of the P103 code but with all the talk about running the injector duty cycle too high with the 2.8 on I took mine off and am going to wait till I can get 60ies and a tune. I think it is better to be safe then sorry with the injectors so that is why I put the 3.0 back on.

 

Mine has been fine. My IDC is also low.

 

There are way more people having major problems with the 60's and a tune than with the 2.8" alone.

 

^^Such as?

 

I would assume that most of the problems people are having with the 60lb injecters is the learning curve with tuning. I havn't seen anything to point to anything else at this time. However I could be wrong.

 

hes kinda right actually.....
there have been 5+ blown engines on 60lbs with tune, 2.5-2.7
1 blown due to a 100 nitrous shot....

 

perhaps they didn't account for the weather change?

 

i am not having any problems with a tune with 60's as of yet have been running since september

 

alot of people have blown their motors to 1. either running to lean or 2. blowing the headgasket hitting 20lbs or more.

 

Does anyone make a 2.9" to fit the gm stage 2 hub

 

I think that basically, in all seriousness, that this issue is one of Tuning. Modification requires proper tuning of your vehicle, and also the proper tools to monitor engine parameters. It all boils down to that. There are too many variables out there for us as a group to say "THIS IS WHAT WILL WORK FOR EVERYONE". Generalized statements, and generalized tuning is NOT how we can go about tuning correctly. It just doesn't work like that.....

You're best option (IMO) is to get a wideband, get HPTuners (or have someone tune it), and get an EGT (pyrometer), and injectors, etc.. Monitor your engines conditions, and parameters, and tune it appropriately from there. Its going to be different for everyone, and weather, elevation, etc. is going to affect the tune as well. Its just something you have to monitor, and stay on top of if you want to do it completely correct.

O/T, but it got down to 8* last night and I cranked out 19lbs with a 2.9" on there. Im sure that the 42.5lb injectors were lovin' that......

Chris-