Corvette Z06 Forum banner
1 - 8 of 8 Posts

·
Registered
Joined
·
94 Posts
Discussion Starter · #1 ·
I have a 2001 Z06. Would 30# fuel injectors help, hurt, make no difference, etc.? What size injector does the car have now? I do get some popping and backfiring when decelerating, particularly when the car is cold. My Corvette Specialist says this is an indication I need larger injectors. Since I've opened the car up with an intake, ported throttle body, headers, no pre-cats and low restriction exhaust, he says I need to compensate by adding more fuel. One of my only complaints with my car, is that (sometimes) I get resonance and vibration around 2700 RPM. It only happens occasionally. My theory is that I may be running slightly lean at lower engine speeds and maybe larger injectors would smooth things out. Your thoughts?
:-?
 

·
Registered
Joined
·
94 Posts
Discussion Starter · #3 ·
You say the '01 injectors are bigger than the '02s. So, leave them alone? What size are they? My AFR from my last dyno run was perfect, so I'm not sure what I'd gain from MAFT. I'm not going to race or go to the drag strip, I just want to stop the resonance and vibration from occuring.
 

·
Registered
Joined
·
5,491 Posts
Check out Halltechs 30# injectors...

....he has a link to the manufacturer and some good info.


<------------over there.
 

·
Registered
Joined
·
803 Posts
TS Cook said:
You say the '01 injectors are bigger than the '02s. So, leave them alone? What size are they? My AFR from my last dyno run was perfect, so I'm not sure what I'd gain from MAFT. I'm not going to race or go to the drag strip, I just want to stop the resonance and vibration from occuring.
I think the '01 uses 28# injectors. If your A/F ratios are good at part throttle and WOT, you're right, you have nothing to gain. However, the MAFT will allow you to trim up the part throttle condition and trim WOT seperately.
 

·
Registered
Joined
·
7 Posts
I think that your specialist is grasping for straws.....450 WHP is about the limit on the 28s, at the operating FP of our cars. I don't think a MAF translator is the answer either....shoot me an e-mail and maybe I can help.:D
 
G

·
Don't forget that for the "02 MY for G.M to save some bucks they got rid of the precats and due to stiffer EPA standards, once the precats went bye bye, they were forced to go back to smaller injectors and to assure exhaust was EPA clean and still meet CAFE, the PCM is biased to lean side, add mods and it gets leaner.

I have worked with several ZO6 owners and with the SVO 30s ( which sell for $240 max, (don't pay any more then that) and the MAFT, they all had good performance gains and the AFR is now better then it was for part throttle and WOT.

With the mods you have made most likely your running on the lean side and worse at wOT. In summer weather it will lean out even more.

A MAFT is just not some mod, it is a functional tool also for it allows you to control the AFR the way you want it and not the PCM that only cares that exhaust is clean and MPG is there.
If PCM was a magic performance tuner no one would ever get DTCs related to fuel trims being too lean or increased pinging due to that leanness.

The best path in using the MAFT for good results is to have a decent PCM scanner like the Ease Enhanced version so that it is your eyesinto the PCM and can know exactly what the AFr, timing, knock, etc looks like and tune with the MAFT to beter those functons.

The larger injectors allow you to run them at a smaller duty cycle, ( less load), will not go static and gives you a reserve as you add more mods you already then have injectors able yo handle those changes.

My LS1 has 1 solid year of use with SVO 30s and it handle the 475 HP quite well and I still get 28 MPG on the freeway and that is with cruise control off and using 3.73 rear end gear.


TS Cook said:
I have a 2001 Z06. Would 30# fuel injectors help, hurt, make no difference, etc.? What size injector does the car have now? I do get some popping and backfiring when decelerating, particularly when the car is cold. My Corvette Specialist says this is an indication I need larger injectors. Since I've opened the car up with an intake, ported throttle body, headers, no pre-cats and low restriction exhaust, he says I need to compensate by adding more fuel. One of my only complaints with my car, is that (sometimes) I get resonance and vibration around 2700 RPM. It only happens occasionally. My theory is that I may be running slightly lean at lower engine speeds and maybe larger injectors would smooth things out. Your thoughts?
:-?
 

·
Registered
Joined
·
1,248 Posts
Hi there,
In conjuntion with Johns points here, your specialist can simply plot your o2 sensors to see just how lean your running, as your pirmaries will show plenty of info, as well as your fule trim tables.
This would be a simple test to see just how you are running. Then, following Johns info above, make a correct decision on the next course of action.
Besttoyou, c4c5:z:
 
1 - 8 of 8 Posts
Top