LOW dyno numbers?

**05gtoautoX** · 10-25-2008, 04:46 PM

I have a 06 GTO with an M6, and recently took it to a friends dyno-jet where it put down 347.73RWHP and 358.30RWTQ, I have pacesetter coated LTs, cat delete, 3in. off road mids, LMII mufflers and a K&N CAI. Now I do have nitrous(not on this particular pull) so this is supposedly a nitrous tune, but I was figuring it should have been closer to 36XRWHP/37XRWTQ. With a Zex 125hp. wet kit it put down only 427RWHP and 479RWTQ which I figured should be closer to 44X RWHP/ 49X RWTQ. Anyway, I'm only running a static 20deg. timing, and have my NGK tr6 plugs gapped at .037, the temp. was 62deg. F. with humidity around 14%. My AFR was a little rich at 10.4 across the board(on N20) from 3K-6200RPMs. Any suggestions? I'm hoping LS2tuner will give me some insight being the N2O guru he is.

**c5z28** · 10-25-2008, 04:49 PM

Dumb question but did you get your car tuned after the headers?

**05gtoautoX** · 10-25-2008, 08:12 PM

yep, street tuned.

**bgable** · 10-25-2008, 09:53 PM

sounds like your nitrous tunes killin your N/A power and dyno numbers...you have your dyno sheet to post?

**Sarge** · 10-26-2008, 04:39 AM

Tune.
Dyno numbers are over rated.

**383hatch** · 10-26-2008, 05:55 AM

10.4 is more than a little rich. Get the AFR where it needs to be and I bet your numbers will be spot on.

**shady milkman** · 10-26-2008, 07:34 AM

Originally Posted by Sarge

Tune.
Dyno numbers are over rated.

x2 they are only references for tuning..not to mention the mustang dyno shows lower numbers..and it could not be calibrated right either

**05gtoautoX** · 10-26-2008, 02:39 PM

I have the dyno sheet but I don't have a scanner, I guess I could take a pic and post and see how that works.

**Sarge** · 10-26-2008, 03:40 PM

Originally Posted by 383hatch

10.4 is more than a little rich. Get the AFR where it needs to be and I bet your numbers will be spot on.

I agree....11's is ok at WOT...or even 12's....10's are PIG rich.

**0rion** · 10-26-2008, 06:47 PM

Originally Posted by 05gtoautoX

I have a 06 GTO with an M6, and recently took it to a friends dyno-jet where it put down 347.73RWHP and 358.30RWTQ, I have pacesetter coated LTs, cat delete, 3in. off road mids, LMII mufflers and a K&N CAI. Now I do have nitrous(not on this particular pull) so this is supposedly a nitrous tune, but I was figuring it should have been closer to 36XRWHP/37XRWTQ. With a Zex 125hp. wet kit it put down only 427RWHP and 479RWTQ which I figured should be closer to 44X RWHP/ 49X RWTQ. Anyway, I'm only running a static 20deg. timing, and have my NGK tr6 plugs gapped at .037, the temp. was 62deg. F. with humidity around 14%. My AFR was a little rich at 10.4 across the board(on N20) from 3K-6200RPMs. Any suggestions? I'm hoping LS2tuner will give me some insight being the N2O guru he is.

yep, you're rich as hell. What was your N/A AFR like?

**05gtoautoX** · 10-27-2008, 11:32 AM

My N/A AFR is:

RPM 2500-- 3000-- 3500 -- 4000-- 4500-- 5000-- 5500-6300

AFR 14.0-- 13.5-- 13.14-- 12.8-- 12.5-- 12.1---- 12.0

kind of a crude table but you get the jist, I know I'm running rich but I do need a little extra fuel N/A when I do spray, it seems the the N20 kit fuel jets over compensate, so I guess I'll add maybe 1 or 2 degrees of timing and lean it out to around 11.8ish on the N20 side and try that.