It's been some time since I was here. The 396 motor is installed and will be fired up shortly. I remember Trax was working on a program, I even have a old copy, for calculating AFR ratios vs RPM. I'm looking for the formula for the $6E code. I want to start it off on the safe side like 12.5:1 and play with it after its broke in.

Thanks

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89 Vette 6 speed
CNC heads, crane cam, Miniram, headers
Soon to be 396 Small Block!

 

'89 ...

I made a huge number of changes to the program and added many utilities to it. However, I haven't 'released' it (not yet).

The AFR Modifier that you have is only setup for the $8D code. However, in my newer program it works with all '86 to '92 TPI code.

The most important thing to note is that the AFRs are only calculated AFRs. In order to truly achieve these AFRs your VE curves (730) or MAF curves (165) need to be on the money.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

Trax,

Thanks for the reply. I understand that the values are calculated. Its give a pretty good idea though I would think.

I'll await yuor release

 

VERRY intersting. this makes me think about the engine as an air pump "system" AND if the VE map is a picture of the VE of the system one could make a really good educated guess @ what this system is doing when @ WOT, by the map (or picture) of the system.

so if the VE map is not right (or pretty close) then the WOT picture is going to be fuzzy.

YES??

BW, with more lightbulbs coming on every day.



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Bob Wooten
r71chevy@earthlink.net
www.r71camaro.homestead.com

 

Bob,

Absolutely. I have seen some 'custom' chips where the 'tuner' spent his time tuning WOT. You can always tell these guys from the rest of us Spend most of your time on Part Throttle and get the VE curves nailed down tight. Then, the WOT curves are a no brainer. The particular BINs I have seen by these 'tuners' would have the WOT %Add-ins pumped up to like 25%! That actually corresponds to calculated AFRs of 9.x (depending on coolant temperature). Now, obviously the guy is not running 9.x air/fuel. What is really happening here is that the upper VE curves are lean and this is being compensated for in the WOT PE vs. RPM table. Although it works - its not how you want to do it. This tuning technique could cause big problems if the user is driving up a steep hill NOT in PE.

Tim

------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

Bang, there it is.

when i first started on this EFI project i was scared of the car so i took it to the "pro's", (Ron Zimmer, Z-industries, i did not want to mention his name, but if he is going to take my money, & do a half ~~~ job I am going to say it) I had my car "dyno Tuned" by someone here in SoCal @ MechTech & he spent all his time @ WO tuning the car to get max hp. he got the AFR's right on & it makes good HP, the thing is that idle quality, mid range torque & mileage all suck.

now i am stuck starting over again basically from the start. do i keep the prom i have & redo it? or do i take the ANHT or AUJP & put that in & start with a new factory prom & wail on it? not sure how i am going to approach that yet.

I have done some small stuff but nothign major. I am waiting on the "how to tune, Part 1 (calling the one that you just did part 2)" before i jump in with both feet.

anywho, as i said, light bulbs coming on all over the place.

BW

ps did you get the email i sent to you regarding part 1?

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Bob Wooten
r71chevy@earthlink.net
www.r71camaro.homestead.com