A friend of mine just bought a Turbo S. He's been running stock chips@16psi for a couple of days. His Zeitronix has been showing a nice 12:1 a/f ratio when on boost. He swapped in a set of Huntley chips today and now he's running lean over 5000rpm.
At 3500-4000 he sees 12:1, but in higher rpms he is running close to 14:1.

He's running a MBC and has bypassed the CV.

I'm looking for expiriences on Huntley chips, and also comments on the lean tendency at higher rpms.

Any input is appreciated.

 

ask Danno, but I believe most chips go lean on the higher RPM range - thats what I've always heard. That is why some of the more customized cars here are running custom mapped chips.

 

Hmmm,
That's funny, my Huntley chips shows rich
from 4500 to redline. Are you running the
chips alone or with the MAF ?

 

It's my friends car. He's running AFM.

 

If these are "turbo s" chips with the Huntley name on them, then I believe they were designed to run with a higher-than-stock fuel pressure, which would probably bring your a/f ratio down in the upper RPM range. It would also cause you to run too rich in the 4000 neighborhood. That seems to be the common experience with "Huntley" chips, from what I can tell.

 

This is Schnell's friend... Him with the lean ratio.

Is there any reason i should not use the original chips as long as the a/f ratio is ok? How much can i boost with original chips? is 1,1bar(16psi) considdered safe?

Thank you for any help!

 

There were numerous iterations of the Huntley chips, so I can't tell you specifically what you have. But they were all based upon a chip that was designed for a dropping boost-curve. So if you have a configuration that can hold flat boost, you'll see a high-RPM lean tendency.

"Is there any reason i should not use the original chips as long as the a/f ratio is ok?"

Well, the ignition may be too high for the higher boost. So I'd recommend setting the FQS to #4 (4 clicks clockwise from stock #0 position) for a 2.73 degree ignition retard.

 

If i want to use the original chips, how do i retard the ignition as described above...? What would happen if i just use the original DME and the KLR from huntley..? Would the not KLR retard the ignition? Im a real noob on this area so i am very thankfull for somebody explaining this

 

Is this the FQS?


If so, how do i know when its in the 4th posision...? I just have to asume it's at zero now, mark zero and feel four clicks clockwise?


If not, would somebody please explain? Feel free to use any pics from this folder to edit and explain:
http://home.no.net/porschen/silberossa/dme/

I just dont wanna do this wrong... If it works out i'll even make a guide including theese pics...

 

This was posted on Danno's 'Racer X' website regarding te FQS settings:
http://members.rennlist.com/951_racerx/FQS-adjust.html

I also believe that is the right location for the FQS (could be wrong, never looked when my 'brain' was open )

 

Yes, that is the FQS switch.

 

Then i'm back from a little testrun.

Using original chips, close to 16psi max, ignition at -2,73 using the FQS in 4th pos.
My AFR's during this limited testing got to aprox 13,5 at max boost, BUT it seems to me like it wont ignite or something.

In 3rd i experienced some "blooping" like hitting a wall... or at least, engine looses all power, as if it wont ignite. After experiencing that once.. i just drowe slowly back home.

My next step will be detuning. Using original chips, std. ingition and 13psi boost, unless anybody have some clever ideas...? (its not like i want to detune, but i dont wanna crack my engine either,,,)

 

Sounds like the overboost protection, which KLR chips are you using?

 

I put back the original KLR as well... Can i pherhaps use the Huntley KLR? -original DME, FQS in pos 4or5...?

 

I would put in the Huntley KLR as the boost protection is part of the KLR chip.
Leave the FQS in 4th and try again.