AFGS with LE2
Thread Starter
Registered User
Joined: Jul 2004
Posts: 37
AFGS with LE2
Hi,
I'm looking for my missing herd horses (over 100 actually) so I'm very interested what are your AFGS with LE2 setup?
My AFGS is 311/6300rpm....
Is it possible that exhaust system would make so great restriction or maybe should I check cam phasing? I'll appreciate any input.
My setup:
LE2, relevant valvetrain, Edelbrock shorty, CAI, !CAT, 2 3/4" exhaust, MadZ28 program.
This is log from DataMater if somebody interested:
http://harry2517.no-ip.com/qndzia/po...t_z_garage.uni
I'm looking for my missing herd horses (over 100 actually) so I'm very interested what are your AFGS with LE2 setup?
My AFGS is 311/6300rpm....
Is it possible that exhaust system would make so great restriction or maybe should I check cam phasing? I'll appreciate any input.
My setup:
LE2, relevant valvetrain, Edelbrock shorty, CAI, !CAT, 2 3/4" exhaust, MadZ28 program.
This is log from DataMater if somebody interested:
http://harry2517.no-ip.com/qndzia/po...t_z_garage.uni
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Re: AFGS with LE2
The gas you are using is a contributing factor as well. You can't run as much timing on it and obviously, the car is not going to make the power it would make on normal 92/93. I will take a look at your datalogs too.
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Re: AFGS with LE2
I looked at your log and I found a 317 at 6150 if that makes you feel any better. 
The logs look just fine to me. (o2s look good, no knock retard) You are maxing out the stock injectors though. I've seen over 120% duty cycle on them.
With the gas you are running, shortys and automatic, I think your readings are not bad. We can try a bit more timing if you want.
Also keep in mind that the guesstimating formula people use is AFGS*1.1 and the result is RWHP, not flywheel HP, so the maximum AFGS reading you would normally get on this setup with LONG TUBES will be in the neighborhood of 350-360.
The logs look just fine to me. (o2s look good, no knock retard) You are maxing out the stock injectors though. I've seen over 120% duty cycle on them.
With the gas you are running, shortys and automatic, I think your readings are not bad. We can try a bit more timing if you want.
Also keep in mind that the guesstimating formula people use is AFGS*1.1 and the result is RWHP, not flywheel HP, so the maximum AFGS reading you would normally get on this setup with LONG TUBES will be in the neighborhood of 350-360.
Thread Starter
Registered User
Joined: Jul 2004
Posts: 37
Re: AFGS with LE2
thanks Ion, I didn't mentioned but these tests were performed on premium gas (92/93).
Right now i'm trying to locate the problem with so small afgs - I don't think that a little over 300 gps of air will support 400 RWHP... but this is why I'm asking here
Right now i'm trying to locate the problem with so small afgs - I don't think that a little over 300 gps of air will support 400 RWHP... but this is why I'm asking here
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Re: AFGS with LE2
You need a 6 speed with 3" exhaust/y-pipe and long tube headers for 400 RWHP. With what you have, I think you would be lucky to see 365-370 RWHP.
I sent you another file to try by the way.
I sent you another file to try by the way.
Thread Starter
Registered User
Joined: Jul 2004
Posts: 37
Re: AFGS with LE2
Originally Posted by madwolf
I looked at your log and I found a 317 at 6150 if that makes you feel any better.
The logs look just fine to me. (o2s look good, no knock retard) You are maxing out the stock injectors though. I've seen over 120% duty cycle on them.
With the gas you are running, shortys and automatic, I think your readings are not bad. We can try a bit more timing if you want.
Also keep in mind that the guesstimating formula people use is AFGS*1.1 and the result is RWHP, not flywheel HP, so the maximum AFGS reading you would normally get on this setup with LONG TUBES will be in the neighborhood of 350-360.
The logs look just fine to me. (o2s look good, no knock retard) You are maxing out the stock injectors though. I've seen over 120% duty cycle on them.
With the gas you are running, shortys and automatic, I think your readings are not bad. We can try a bit more timing if you want.
Also keep in mind that the guesstimating formula people use is AFGS*1.1 and the result is RWHP, not flywheel HP, so the maximum AFGS reading you would normally get on this setup with LONG TUBES will be in the neighborhood of 350-360.
but does this shorties make so great difference - beetwen 310 and 350 gps??
About injectors - I have to change them although I made tests with LM1 tool - at WOT there is consistent 10.2 AFR... So i think that injectors are ok right now.
Registered User
Joined: Jul 2001
Posts: 4,577
From: DeKalb, IL
Re: AFGS with LE2
10.2 AFR is VERY rich. You would see crazy black smoke out of the tailpipes if you had that AFR. Your logs definetely don't show a 10.2 AFR. It actually showed slightly lean at higher RPM, which makes sense. I added a bit more fuel in the new program. I don't know if your injectors will be able to pump it out, but a new log will show.
Yes, there is a BIG difference between long tubes and shorties, especially on a heads/cam car.
Yes, there is a BIG difference between long tubes and shorties, especially on a heads/cam car.
Last edited by madwolf; May 23, 2005 at 11:09 AM.
Thread Starter
Registered User
Joined: Jul 2004
Posts: 37
Re: AFGS with LE2
Originally Posted by madwolf
You need a 6 speed with 3" exhaust/y-pipe and long tube headers for 400 RWHP. With what you have, I think you would be lucky to see 365-370 RWHP.
I sent you another file to try by the way.
I sent you another file to try by the way.
What's more my gps are a little better then before HC (around 270/5900rpm from 245 after custom Y-pipe)..I'll try to remove cat-back system to see if it will make any diffrence..
Thanks for the new program
I'll try to send you pics of AFR from LM1 (or can send you log only if you have software).
Registered User
Joined: Aug 2003
Posts: 639
From: Amarillo, Texas
Re: AFGS with LE2
I have a M6 with LE1 heads, LE2.1 Cam, And the supporting mods....Longtubes, 30# Injectors, 58mm TB, Stock intake...
I see on average...360-380 AFG's.
I also dyno'd 417 RWHP......
Just giving you some info to go off of.
Joseph
I see on average...360-380 AFG's.
I also dyno'd 417 RWHP......
Just giving you some info to go off of.
Joseph
Thread Starter
Registered User
Joined: Jul 2004
Posts: 37
Re: AFGS with LE2
Originally Posted by madwolf
10.2 AFR is VERY rich. You would see crazy black smoke out of the tailpipes if you had that AFR. Your logs definetely don't show a 10.2 AFR. It actually showed slightly lean at higher RPM, which makes sense. I added a bit more fuel in the new program. I don't know if your injectors will be able to pump it out, but a new log will show.
Yes, there is a BIG difference between long tubes and shorties, especially on a heads/cam car.
Yes, there is a BIG difference between long tubes and shorties, especially on a heads/cam car.
here are pics from LM1 log:
http://harry2517.no-ip.com/qndzia/AF...th_with_XY.JPG
http://harry2517.no-ip.com/qndzia/afr1.jpg
http://harry2517.no-ip.com/qndzia/AF...en_4000rpm.JPG
Last edited by qndzia; May 23, 2005 at 01:42 PM.
Registered User
Joined: Nov 2001
Posts: 3,515
From: Kansas
Re: AFGS with LE2
Altitude makes a big difference as does air temp in MAF readings. I have seen as much as 360 with my LE1 heads, 224/230 cam in 40* weather but only around 320 recently with the 90* weather.
Registered User
Joined: Jan 2002
Posts: 1,743
From: Mission, Kansas
Re: AFGS with LE2
AFGS #'s can tell you roughly what you make but it's not always close. I was hitting 400+ at times on my le2/383 and I know it wasn't making that much power on the base tune seeing as it only did 115.6mph. Also, I saw a hotcam/lightly ported heads car hit 340afgs about a week ago but could only put down a 104mph with stall/gears/long tubes.
I heard about the afgs theory for the first time last fall from a post that Ion made and I datalogged a few cars and it didn't seem to add up correctly. Hell my buddies car only was doing 320 afgs but it put down 385rwhp/368rwtq, and that was datalogging on the dyno.
Have you actually dyno'd the car? Are you sure it has a 10.2 afr, did you have it wideband calibrated correctly?
I heard about the afgs theory for the first time last fall from a post that Ion made and I datalogged a few cars and it didn't seem to add up correctly. Hell my buddies car only was doing 320 afgs but it put down 385rwhp/368rwtq, and that was datalogging on the dyno.
Have you actually dyno'd the car? Are you sure it has a 10.2 afr, did you have it wideband calibrated correctly?