Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Vararam
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Tuning / Diagnostics -- engine and transmission


Reply
 
Thread Tools
Old 02-26-2010, 10:39 PM   #1
Danny5
 
Danny5's Avatar
 
Drives: 10 2SS, 08 Sienna, 12 Sonic
Join Date: Nov 2009
Location: Glendale, AZ
Posts: 101
Running too rich!

It took 9 dyno pulls to finally get a 370hp number, but every pull showed the same problem.

My car is definitely running too rich!

Same car on the same day ran almost perfect fuel numbers. But mine is running at 12:1. Its very frustrating.

Any theories? Bad O2 sensor maybe???

__________________
It could be that the purpose of your life is to only serve as a warning to others. Ashleigh Brilliant
Danny5 is offline   Reply With Quote
Old 02-26-2010, 10:41 PM   #2
Danny5
 
Danny5's Avatar
 
Drives: 10 2SS, 08 Sienna, 12 Sonic
Join Date: Nov 2009
Location: Glendale, AZ
Posts: 101
Here is the same type of car (LS3) with same mods (muffler delete) on the same dyno, same day!

__________________
It could be that the purpose of your life is to only serve as a warning to others. Ashleigh Brilliant
Danny5 is offline   Reply With Quote
Old 02-26-2010, 10:50 PM   #3
nhra stocker
 
nhra stocker's Avatar
 
Drives: 69,10 camaro 71 chevelle
Join Date: Jul 2009
Location: Shelbyville, IL
Posts: 722
I had 3 pulls on a Dyno jet , Bone stock and my first pull was 10.8:1 AFR and the second two picked up to 11.2:1 ! I think its just the random factory settings??? I made 380rwhp and 383 rwtq. Same dyno another stock LS-3 had 12.5:1 with 6 less hp and 8 less on the tq.
__________________
2010 Camaro SS RS M6 Bone stock 12.58 at 110mph http://www.camaro5.com/forums/showpo...&postcount=263
1971 Chevelle SS 454 365hp NHRA C/SA 10.73 at 122
1969 Camaro (427 ZL-1 clone) M-22 being built
1982 Siverado 4x4 454 Mud truck stock class 3.66 sec in 150' of mud
nhra stocker is offline   Reply With Quote
Old 02-26-2010, 11:16 PM   #4
Danny5
 
Danny5's Avatar
 
Drives: 10 2SS, 08 Sienna, 12 Sonic
Join Date: Nov 2009
Location: Glendale, AZ
Posts: 101
I am not so concerned about the power difference as I am the AFR values. It sounds like your car is pretty similar...
__________________
It could be that the purpose of your life is to only serve as a warning to others. Ashleigh Brilliant
Danny5 is offline   Reply With Quote
Old 02-27-2010, 04:59 AM   #5
Roger Ramjet
Motor Head
 
Roger Ramjet's Avatar
 
Drives: CTS-V
Join Date: Feb 2009
Location: So MD
Posts: 494
I think your AFR is fine. It's the other car I would worry about - leaner than 12.8 is dangerous.
__________________
History Camaro's: 83, 93, 95, 98, & 10.
Roger Ramjet is offline   Reply With Quote
Old 02-27-2010, 05:10 AM   #6
Roger Ramjet
Motor Head
 
Roger Ramjet's Avatar
 
Drives: CTS-V
Join Date: Feb 2009
Location: So MD
Posts: 494
I don't like it when shops use the STD horsepower correction factor. That method artificially inflates measurements when temp is above 60 F. They did give you the ambient conditions. So, I would use the SAE HP correction method to get a more accurate indication of power produced.
__________________
History Camaro's: 83, 93, 95, 98, & 10.
Roger Ramjet is offline   Reply With Quote
Old 02-27-2010, 05:56 AM   #7
Wvallediego
 
Wvallediego's Avatar
 
Drives: Inferno Orange 2010 RS SS
Join Date: Nov 2009
Location: uas
Posts: 408
wOW, YOU GUYS/GALS ARE TECHies!
Wvallediego is offline   Reply With Quote
Old 02-28-2010, 08:23 AM   #8
DSteck
Account Suspended
 
Drives: 2006 Corvette Z06
Join Date: Feb 2010
Location: St. Louis, MO
Posts: 587
If the dyno was using a tail pipe sniffer, then I wouldn't believe anything the AFR shows at all.

Your factory O2 sensors won't really control wide open throttle fueling (however, there's a caveat to that).

Beyond all of that, though... if you're flogging the crap out of a car, it's going to start using Cat Overtemp Protection, dumping fuel to try and keep the cats from melting and breaking apart.

Last edited by DSteck; 02-28-2010 at 08:36 AM.
DSteck is offline   Reply With Quote
Old 02-28-2010, 09:25 AM   #9
69lt1bird
 
69lt1bird's Avatar
 
Drives: 1969 Pontiac Firebid
Join Date: Aug 2009
Location: Lapeer, MI
Posts: 89
Factory FWHP is rate at 426, you made 370 RWHP like most LS3 Camaro's do. With roughly 15% driveline loss that puts you right where you should be.
__________________
Free HP Tuners Beginners Tuning Guide

Michigan Snowmobiler
1969 Firebird: 7.55@97.93 1/8 1.70 60 ft.[/COLOR] EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me
69lt1bird is offline   Reply With Quote
Old 02-28-2010, 11:33 PM   #10
Danny5
 
Danny5's Avatar
 
Drives: 10 2SS, 08 Sienna, 12 Sonic
Join Date: Nov 2009
Location: Glendale, AZ
Posts: 101
Yes it was a tailpipe wideband. I am still running richer than any Camaro tested at this facility. I would trust the reading on a purely comparative basis.

I know my HP numbers are where they should be. Thank you for pointing that out. I would like to keep this thread OT and limit comments to people's experience with AFR on the V8s.

Thanks!
__________________
It could be that the purpose of your life is to only serve as a warning to others. Ashleigh Brilliant
Danny5 is offline   Reply With Quote
Old 03-01-2010, 09:12 AM   #11
StlRomAniaN

 
StlRomAniaN's Avatar
 
Drives: IOM 2010 Camaro 2SS/RS
Join Date: Mar 2009
Location: St. Louis
Posts: 1,782
Quote:
Originally Posted by 69lt1bird View Post
Factory FWHP is rate at 426, you made 370 RWHP like most LS3 Camaro's do. With roughly 15% driveline loss that puts you right where you should be.
Sorry bro, but FWHP?! Really? It's rated 426 HP at the 'Crank' aka the engine. There is no power being distributed to the front wheels as you said.
__________________
StlRomAniaN is offline   Reply With Quote
Old 03-01-2010, 09:23 AM   #12
Steve@Vectormotorsports
 
Drives: Firehawk
Join Date: Jun 2009
Location: Port Huron
Posts: 213
Quote:
Originally Posted by Danny5 View Post
Yes it was a tailpipe wideband. I am still running richer than any Camaro tested at this facility. I would trust the reading on a purely comparative basis.

I know my HP numbers are where they should be. Thank you for pointing that out. I would like to keep this thread OT and limit comments to people's experience with AFR on the V8s.

Thanks!
I believe DSteck has already answered your question, I would put the cat over temp as my suspect as well.
Steve@Vectormotorsports is offline   Reply With Quote
Old 03-01-2010, 09:29 AM   #13
DSteck
Account Suspended
 
Drives: 2006 Corvette Z06
Join Date: Feb 2010
Location: St. Louis, MO
Posts: 587
Quote:
Originally Posted by StlRomAniaN View Post
Sorry bro, but FWHP?! Really? It's rated 426 HP at the 'Crank' aka the engine. There is no power being distributed to the front wheels as you said.
FWHP = Flywheel Horse Power
DSteck is offline   Reply With Quote
Old 03-01-2010, 06:30 PM   #14
69lt1bird
 
69lt1bird's Avatar
 
Drives: 1969 Pontiac Firebid
Join Date: Aug 2009
Location: Lapeer, MI
Posts: 89
Hmn, flywheel horsepower I figured everyone knew that, Opps, I will explain it better next time.

I also have plenty of tuning experience, if 12:1 is the richest they have ever seen on that dyno, they haven't tuned many new Camaro's or that wideband is way off.
__________________
Free HP Tuners Beginners Tuning Guide

Michigan Snowmobiler
1969 Firebird: 7.55@97.93 1/8 1.70 60 ft.[/COLOR] EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me
69lt1bird is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Running Rich GRSCAMARO Mechanical Maintenance: Break-in / Oil & Fluids / Servicing 7 02-25-2010 04:42 PM
Running out of things to do to my Camaro BaylorCamaro 5th Gen Camaro SS LS LT General Discussions 53 02-22-2010 08:30 AM
Anyone running Long Tubes in New Jersey? robertway USA - NY / NJ / PA 11 01-25-2010 08:04 PM
L99 running rich after minor mods? monza66mo Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 3 11-30-2009 11:56 AM
Header Installation Concern - Delayed Tune DNA Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons 12 08-25-2009 04:31 PM


All times are GMT -5. The time now is 07:09 PM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.