N/A and Dry Nitrous in the same tune?

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Jul 2, 2004 | 11:42 AM

V-10 Killer

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From: Midland MI

N/A and Dry Nitrous in the same tune?

Right now i have a NOS5177 kit. And I was just wondering if anyone here has tuned a dry kit to run great on and off the bottle in the same tune.
I don't know what variable would have to be manipulated to get ~12.6:1 AFR off, and ~11.5:1 AFR on.
I can't see it being PE vs. RPM, PE vs. Temp, VE tables, or IFR.
The most air I've seen my car pull in N/A at WOT so far is about 302 g/s.
So, maybe the MAF tables, above ~11,000?

I'd like to do a Direct Port kit soon, I know that'd simplify the hell out of it. But I'm gonna need to do drivetrain upgrades first....Maybe someday

Thanks everyone.

Jul 2, 2004 | 11:56 AM

jimmyblue

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From: East Central Florida

If it were me... I'd rig a relay & resistor to mess the
IAT around, jack it to a real low temperature indicated
value (like -40F). Then use the IAT correction tables for
PE and spark advance to make that corner cell combo
(which for most of us will never be seen, except when
the switch is set; dunno about the people from Frostbite
Falls MN, tho) a fat mixture, short spark "special tune".

Jul 2, 2004 | 01:27 PM

Ragtop 99

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From: Bethesda, MD

Good idea. Before Edit, people use to do the opposite by using the resistor to push the IAT temp to the high end of the scale because the PCM tables reduced spark advance when the IAT gets up around 140 - 160*.

Jul 3, 2004 | 11:10 PM

WS6 GreeN

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From: Birmingham, AL

I've read where you can tune the MAF table with a dry kit, up in an area you never see at N/A WOT. I think you're on the right track.

Jul 3, 2004 | 11:26 PM

Sonny

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From: DFW

It has been done by a lot of people. Here is a writeup by somebody:
http://www.geocities.com/whitetransa...ing_tuning.htm

Happy tuning,

Jul 4, 2004 | 06:10 AM

V-10 Killer

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From: Midland MI

Quote:

Originally Posted by Sonny

It has been done by a lot of people. Here is a writeup by somebody:
http://www.geocities.com/whitetransa...ing_tuning.htm

Happy tuning,

That page seems to focus on timing adjustments.
Though helpful, It won't help me change my air fuel ratio under nitrous.
But thank you anyway.

Jul 5, 2004 | 05:58 PM

Sonny

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From: DFW

Quote:

Originally Posted by V-10 Killer

That page seems to focus on timing adjustments.
Though helpful, It won't help me change my air fuel ratio under nitrous.
But thank you anyway.

It is same concept.
Log and look at the maf frequency @ WOT on spray vs maf frequency @ WOT NA. The former should be higher, go to the MAF table and increase load for that frequency range.