[enkeivette]

Originally Posted by Vettezuki

Did I misunderstand it in principle? Light Throttle = rich, Heavy Throttle = Lean

It's a spectrum of rich -> lean according to throttle position???



Define PV.



Define PCVR.




It only takes ONE lean backfire to destroy an O2's ability to accurately represent the amount of oxygen flowing by. To my understanding.

It was lean, now it's not lean under boost, and hopefully not under WOT. Still rich at part throttle.

Power Valve

Power valve channel restriction

Haven't had any lean backfires, and I doubt it. Further, I can recalibrate my 02 sensor whenever I want to, cuz that's how I roll playa.

[Vettezuki]

Originally Posted by enkeivette

. . . Further, I can recalibrate my 02 sensor whenever I want to, cuz that's how I roll playa.

Hey playa, wouldn't you need some kind of standard to "recalibrate" to? How does that work?

I'm glad you're learning all this stuff on your car. Should make tuning RX-Snake go pretty smoothly. Bird has some kind of fantastical Sun machine for dialing in ignition curves on Dizzies and doing other diagnostic work. I only vaguely get it, but it's cool looking. Looks like a "computer" from a 60s war movie.

[big2bird]

I didn't mean to be rude, I just went to bed early. I can't stay up till 3AM anymore. Those days are gone.

I sent Adam a tuning paper for holleys by Dr. Lars Grimsrud.

Lars taught carb operation at GM for many years, and races on weekends.

The paper is very extensive, and too large to reproduce here. There are many checks to perform BEFORE even tuning, and there is a certain order of things to prevent chasing your tail.

[big2bird]

Originally Posted by 94cobra69ss396

He had a 15:1 AFR at wide open throttle and 10:1 at cruise. He needs to lean out the primaries more to fix the cruise ratio which will make the WOT ratio even leaner. I didn't want him to blow his newly repaired engine. Once he has the WOT ratio to where he wants it it is easy to go back and fine tune the primaries for a good cruise ratio and then readjust the secondaries for a safe WOT ratio again.

I do understand the logic here. I just don't think I would approach it that way. If he goes back to square one, he can work up to WOT, and avoid WOT while tuning.

[Vettezuki]

Makes sense to me.

Send me the paper too yo. Any paper written by a guy named Dr. Lars has got to be good.

[enkeivette]

Ben, base line reading should be 20.9 (known atmospheric level). If it deviates more than .4 the LM2 will calibrate to correct it.

Bird, thanks for the e-mail, I'll attach it here for others. At the risk of sounding arrogant, I'm sort of beyond his general tuning guidelines. I've definitely used them to get my car a good base line tune, but his paper doesn't dive into air bleeds, & pcvrs. And Demons are notorious for going lean at WOT, you can up the jet size as much as you want and it will still be lean at WOT.

Also, I used his timing procedure to set up my NA setup, but now that I have to limit my total timing to 28 because of the blower I can't setup the butterflys over the trasfer slots the way that they should be.

[big2bird]

Then, I suggest you start a thread at VM where he can respond, or e-mail him directly. I also have his phone # should you wish to call him. I am sure he will help you, or at most tell you to trash the Demon, and try something else.

[94cobra69ss396]

Originally Posted by enkeivette

Also, I used his timing procedure to set up my NA setup, but now that I have to limit my total timing to 28 because of the blower I can't setup the butterflys over the trasfer slots the way that they should be.

Does your Demon have the Idle-Eze? If so you need to adjust it so that you can close the butterflys where they need to be.

[enkeivette]

Idle Eze is adjusted, won't help me now. Car needs to be limited to 28 total, wants 18 initial to idle adequately with the transfer slots set correctly, cannot find a 10 degree bushing, otherwise I would.

I know what I need to do, smaller primaries for cruise, drill the PVCRs between 70 and 80 for a baseline.

Might need to drill out the PV protection to prevent it from kicking on under boost, need to call Demon and find out if this is a potential problem.

[big2bird]

Originally Posted by enkeivette

Idle Eze is adjusted, won't help me now. Car needs to be limited to 28 total, wants 18 initial to idle adequately with the transfer slots set correctly, cannot find a 10 degree bushing, otherwise I would.

What kind of dizzy?