Pro Stock John

iTrader: (34)

Please respond if you can...

What is your AF ratio on the dyno and/ or your 02 readings via Autotap or EFILive?

Redline-Motorsports

iTrader: (3)

John,

We have always found the gen3 motor to make it's best power at 13.2-13.4 with a wide band on the dyno. Mainly due to the "fast burn" combustion chambers. What a great head design!

However with a high end stroker motor, running a tad richer would not be a bad idea to keep it under control. I wouldn't go any richer then 13.0

I never liked looking at AutoTaps for o2 readings as they are only good at 14.7 +/- 5 % and vary from car to car.

John B

iTrader: (10)

Out of curiosity, why would a stroker have a different A/F for best power?

EuG

Well, A/F is different at different rpms. You want to be a bit richer at peak TQ.
Anyway, if you wanna check mine out click on the dyno numbers in the sig for the graph….

Cmarsh93z

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John B:
<strong>Out of curiosity, why would a stroker have a different A/F for best power?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">My thoughts exactly. And why do you have 02 volts posted....I assume you think they are accurate enough for comparison <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Chris

SLED28

iTrader: (7)

<img border="0" alt="[guns]" title="" src="graemlins/gr_guns.gif" /> JOHN!
I talked to Wade and he said he's talked to you about this. Your combo needs low-mid 12 A/F's! The car will run leaner at the track then on the dyno. If its starving so to speak you will not run the MPH... I would listen to your engine builder first <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

<small>[ October 16, 2002, 09:32 AM: Message edited by: SLED28 ]</small>

John B

iTrader: (10)

PSJ, WHY DON'T YOU ATAP YOUR MOTOR ON THE STREET AT WOT.....asking for the umteenth time <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" /> At least this way you can comepare to your dyno runs!

MelloYellow

Gen3 my experience is 12.6-12.8:1

13.0-13.2 didn't help and increased detonation.

Pro Stock John

iTrader: (34)

Yeah I'm at 13:1 and the feeling is that it's too lean for the track under true load.

I'm planning to redyno with the new target AF that Wade suggested.

Pro Stock John

iTrader: (34)

John B, there are not a lot of places where I can do a full on 1/4 blast near Chicago, and we are most concerned with 3rd gear high speed AF's... And I got arrested for 110/55 zone a few years ago so I don't screw around like I used to on the street.

Anyone else?

John B

iTrader: (10)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">there are not a lot of places where I can do a full on 1/4 blast near Chicago, and we are most concerned with 3rd gear high speed AF's... And I got arrested for 110/55 zone a few years ago so I don't screw around like I used to on the street </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ahhhhhh,, understand but this missing data piece is vital for a good analysis, otherwise, we are assuming that this is okay and it might not be. If you need to take a one hour cruise somewhere to get out "in the boon docks", these key data points in high gear will tell us plenty! Good luck!

Redline-Motorsports

iTrader: (3)

Most stroker motors are usually setup for making big power. The compression is usualy bumped pretty good to make the numbers so we like to run them a bit richer to better control the cylinder temperatures. Kind of the same way a superchargered motors are setup at A/F's of 12.7-12.9 with an LS engine.