Thanks rbatick, I'll look for 12.8.

mark

 

Which raises the question of why the Halltech Stinger intake throws codes while the Vararam intake does not?? Assuming the theory that increased airflow is the problem, it follows that the Vararam does not flow as well.

I've been toying with the idea of installing some type of high-flow intake, but this thread gives me doubts.

 

I know I've said this about 3 times already, increased airflow is NOT the problem. Re-read my post on this page.

 

Let us assume that it isn't an excess amount of air, but a general disruption of air through the MAF hence it doesn't get a good reading. Try installing a spacer between the filter and the MAF instead of hooking the filter to the MAF. If the issue goes away the problem is solved.

This only works if I am following the threads instructions that I gleaned over the last 4 pages. Excuse me if I'm wrong.....

I just bought a K&N FIPK from a forum member to install on mine.

 

Is the lean issue only with Z06s?

 

That's what I wanted to do but there is no clearance between the front of the filter and the front of the car to do so. You either have to cut the bridge or the coupler to allow for more room. Then fitment becomes an issue.

I'm thinking of trying a smaller conical type filter like a K&N FIPK. Since it's tappered, perhaps the air will pass through in a more lamninar fashion. One thing is strange though. I threw no codes when mating the warhead filter to the stock airbridge and coupler. If the problem is a an air disturbance problem, it should still be an issue with the stock bridge.

mark

 

Sorry you're having problems. We'll refund your purchase if you decide to go back to stock.

You can install the 2001 Z06 MAF (same as on all LS1s from 2001 to present) and the problem will resolve immediately.

The Z06 MAF (I'm assuming you have a Z06) has no laminar airflow screen to smooth out the air at low throttle settings. This causes a misread between the MAF reported airflow and the actual airflow seen at the O2 sensors.

If the O2 sensors have to add too much fuel to any one of 19 fuel cells to correct this misread, it pops the lean code, assuming that there is an airleak.

Sometimes it is an airleak. If you have taken the rubber F-seal off the mouth of the Tunnel Bridge, there is a good chance you installed it incorrectly. The F-Seal MUST be installed correctly, or you will get codes due to unmetered air entering the system.

No harm will come from this, but it is a PITA.

By the way, it is my understanding, that GM has gone back to the laminar airflow screen on the MAF on the new C6. Thank God.

My feeling is "It makes no sense to make a sensor less sensitive!"

Jim Hall

 

Thanks for giving us the opportunity to return for a refund if we wish. Anyone know what the '01 MAF goes for? I think i'll keep the stinger.

 

I have one in stock (used) for $40.00. They are generally about $90 at the dealers.

Amazingly, this MAF came from the GM truck originally, but as I said, it is just a sensor, not a high performance item.

When GM took the screen out, they managed to screw up tuning on the Z06. I have seen stock Long Term Fuel Trims as high as +10% on the screenless Z06s with the TECH II Diagnostic Tool. That much error to begin with does not allow the aftermarket much to work with when trying to increase flow through the filter design itself.

At one time, we considered going back to 4 layer cotton (read K&N style) just to get more restrictive airflow to cure this anomoly, but you are better off just getting the 01 Z06 MAF.

Interestly, GM asked Halltech for 2 T1C intake systems back in early 2002 for testing. On the 2003 Z06 being tested then, it made over 380 RWHP with their onboard diagnostic tools.

I was told by the head programming GURU who was piloting this car, that the Long Term Fuel trims do NOT affect WOT trimming at all. Period.

What does occur, is the COTP (cat overtemp protection) circuit sees the lean condition and pumps more gas into the engine until the exhaust temps cool down. This prevents premature catalytic converter failure, and should not be programmed out.

There is a way, with LS1 edit to program this circuit into oblivion, and reset LTF trims to never pop codes again.

LS1 Edit or the latest tuning devices can add 10 RWHP to most Stinger equipped C5s.

21st Century Muscle Car, dynoed our TRAP on a 6 speed LS1 and got 15 RWHP with no other changes at all.

They then added the Z06 screens up front, tuned the car with LS1 Edit to lean out WOT, and added a cooler thermostat.

The final result:

(The TRAP uses the same Warhead filter as the Stinger)