New Dyno #'s

Bad Pony · 01-16-2003, 02:17 PM

Finally got my car to a dyno after changing the pulley on my E-trim to a 3.125 and installing the AFM powerpipe. First off, let me say I never expected to pick up 6psi going from a 3.3 to a 3.125 & AFM PP but that's what I got, I now have a whopping 14psi to play with.

1st run- 485rwhp/420rwtq A/F @ 7400rpm 12.5/1

3rd run- 503rwhp/465rwtq(25shot) A/F @ 7200 12.6/1

JMS has my rev limiter set to 7500 but I backed out on the nitrous run early.. no sense in pressing my luck

This was still using the 8psi tune, I don't know if anything else can be gained by retuning since the A/F #'s looked so good.

I'm still pleasantly surprised with the outcome...

BAD PNY · 01-16-2003, 02:53 PM

Joey are you still using the stock internals... Nice numbers BTW.

Haven't seen you around much lately?

tcrews · 01-16-2003, 04:31 PM

Is that A/F ratio on the dyno or on the street? On the dyno isn't that a tad high as once you put the car under load (on the road) you'll really be seeing an A/F of 13.0-13.5 if it's 12.5 on the dyno.

Other than that....VERY nice numbers....

Bad Pony · 01-16-2003, 06:00 PM

all stock internals Bad Pny

Tom, until about 7k rpms the a/f was well into the 11's, matter of fact from 4750 to 7k it was between 12.0 and 11.1, at 7k it was still at 12.0/1. I'm not sure if what you say is true or not, never heard anyone mention that but I don't hear alot

smashedheadcat · 01-16-2003, 06:23 PM

Dear Goodness!!

That's just right up my alley!!!

smashedheadcat · 01-16-2003, 06:24 PM

The numbers that is

Bad Pony · 01-16-2003, 06:29 PM

double post, deleted

smashedheadcat · 01-16-2003, 06:43 PM

Nice setup you've got there Bad Pony. Real NICE!!

tcrews · 01-16-2003, 08:00 PM

It's when the engine has to actually move the car vs. just spinning the dyno-rollers....this is known to cause your A/F ratio to change between .5 and 1.0 (+) over what your dyno A/F ratio was.....

Unfortunately for me I wasn't aware of this until after my dynotune and I flatlined at 12.5:1 from about 5,500-6,500 where we ran out of fuel. This basically put me running up to 13.5:1 A/F when on the street and bye-bye engine!!!

Excellent numbers....and the tune sounds good to me.

Big Daddy · 01-16-2003, 10:09 PM

Bad Pony, Great numbers!! Are you planning on coming to the drag day in March??

NO 5 OH · 01-18-2003, 10:28 PM

Quote:

Originally posted by tcrews
Is that A/F ratio on the dyno or on the street? On the dyno isn't that a tad high as once you put the car under load (on the road) you'll really be seeing an A/F of 13.0-13.5 if it's 12.5 on the dyno.

Other than that....VERY nice numbers....

I'd have to agree with Tom on this one too. On tuning with my "four banger car" several reputable tuners said that you really didn't want the A/F going much about 11.80. After that you'd be running on the ragged edge and be looking at detonation... which would ultimately spell disaster.

But nice numbers too Joey. I'm with Greg... you coming to the Spring Drag Day?

Bad Pony · 01-21-2003, 05:20 AM

Not sure I will make it but we'll see what happens. I'll have my LT's on by then regardless

01-16-2003, 02:17 PM	#1
Bad Pony SCMC Member Join Date: Jun 2001 Location: B'ham, AL Posts: 291	New Dyno #'s Finally got my car to a dyno after changing the pulley on my E-trim to a 3.125 and installing the AFM powerpipe. First off, let me say I never expected to pick up 6psi going from a 3.3 to a 3.125 & AFM PP but that's what I got, I now have a whopping 14psi to play with. 1st run- 485rwhp/420rwtq A/F @ 7400rpm 12.5/1 3rd run- 503rwhp/465rwtq(25shot) A/F @ 7200 12.6/1 JMS has my rev limiter set to 7500 but I backed out on the nitrous run early.. no sense in pressing my luck This was still using the 8psi tune, I don't know if anything else can be gained by retuning since the A/F #'s looked so good. I'm still pleasantly surprised with the outcome... __________________ 99 Cobra Coupe #3526 Black/Med.Parchment SCT by Bamachips.com Vortech E-trim/3.125 Pulley AFM Powerpipe/BBK Twin 65mm TB BBK LT Headers/Shorty X-pipe Bassani Catback Tokico Drag Struts/HAL Drag Shocks Steeda Race Wing/Cobra R Hood Raxles 1/2 Shafts 490rwhp/412rwtq MGW Poster Child SCMC#233

01-16-2003, 02:53 PM	#2
BAD PNY Registered User Join Date: Jun 2001 Location: Manheim, Pa Posts: 139	Joey are you still using the stock internals... Nice numbers BTW. Haven't seen you around much lately? __________________ 1998 Laser Red Vobra Convertible 11.51 @ 122.29 "yea it makes power" 2001 Sunset Orange Trans Am WS6 2002 Electron Blue Z06 Phoenix Performance T1 enhanced

01-16-2003, 04:31 PM	#3
tcrews Moderator Join Date: Jun 2001 Location: Lexington, SC Posts: 878	Is that A/F ratio on the dyno or on the street? On the dyno isn't that a tad high as once you put the car under load (on the road) you'll really be seeing an A/F of 13.0-13.5 if it's 12.5 on the dyno. Other than that....VERY nice numbers.... __________________ Tom Crews 1997 Cobra Coupe #3672, SCMC #82 571 rwHP 462 rwTQ ------- 1998 Cobra Convertible 264 rwHP 268 rwTQ Tom's SVT Cobra Page

01-16-2003, 06:00 PM	#4
Bad Pony SCMC Member Join Date: Jun 2001 Location: B'ham, AL Posts: 291	all stock internals Bad Pny Tom, until about 7k rpms the a/f was well into the 11's, matter of fact from 4750 to 7k it was between 12.0 and 11.1, at 7k it was still at 12.0/1. I'm not sure if what you say is true or not, never heard anyone mention that but I don't hear alot __________________ 99 Cobra Coupe #3526 Black/Med.Parchment SCT by Bamachips.com Vortech E-trim/3.125 Pulley AFM Powerpipe/BBK Twin 65mm TB BBK LT Headers/Shorty X-pipe Bassani Catback Tokico Drag Struts/HAL Drag Shocks Steeda Race Wing/Cobra R Hood Raxles 1/2 Shafts 490rwhp/412rwtq MGW Poster Child SCMC#233

01-16-2003, 06:23 PM	#5
smashedheadcat Registered User Join Date: Oct 2001 Location: Geneva, Switzerland Posts: 1,727	Dear Goodness!! That's just right up my alley!!! __________________ Josh 2003 Oxford White Cobra Coupe Twin Turbo Solid Axle Automatic Return Fuel System 1997 Triple Black Cobra Convertible Forged and Blown. 511rwhp 398 rwtq Sold

01-16-2003, 06:24 PM	#6
smashedheadcat Registered User Join Date: Oct 2001 Location: Geneva, Switzerland Posts: 1,727	The numbers that is __________________ Josh 2003 Oxford White Cobra Coupe Twin Turbo Solid Axle Automatic Return Fuel System 1997 Triple Black Cobra Convertible Forged and Blown. 511rwhp 398 rwtq Sold

01-16-2003, 06:29 PM	#7
Bad Pony SCMC Member Join Date: Jun 2001 Location: B'ham, AL Posts: 291	double post, deleted

01-16-2003, 06:43 PM	#8
smashedheadcat Registered User Join Date: Oct 2001 Location: Geneva, Switzerland Posts: 1,727	Nice setup you've got there Bad Pony. Real NICE!! __________________ Josh 2003 Oxford White Cobra Coupe Twin Turbo Solid Axle Automatic Return Fuel System 1997 Triple Black Cobra Convertible Forged and Blown. 511rwhp 398 rwtq Sold

01-16-2003, 08:00 PM	#9
tcrews Moderator Join Date: Jun 2001 Location: Lexington, SC Posts: 878	It's when the engine has to actually move the car vs. just spinning the dyno-rollers....this is known to cause your A/F ratio to change between .5 and 1.0 (+) over what your dyno A/F ratio was..... Unfortunately for me I wasn't aware of this until after my dynotune and I flatlined at 12.5:1 from about 5,500-6,500 where we ran out of fuel. This basically put me running up to 13.5:1 A/F when on the street and bye-bye engine!!! Excellent numbers....and the tune sounds good to me. __________________ Tom Crews 1997 Cobra Coupe #3672, SCMC #82 571 rwHP 462 rwTQ ------- 1998 Cobra Convertible 264 rwHP 268 rwTQ Tom's SVT Cobra Page

01-16-2003, 10:09 PM	#10
Big Daddy Registered User Join Date: Dec 2001 Location: Asheville, NC Posts: 4,885	Bad Pony, Great numbers!! Are you planning on coming to the drag day in March?? __________________ 2008 Shelby GT500 White w/Blue Stripes STOCK AND STAYING THAT WAY! Kenny Brown '01 Cobra S Serial # 01-047C True Blue Performance Forged Short Block FR500 Heads & Cams, Fluidyne Radiator McLeod Clutch and aluminum flywheel Aluminum Driveshaft, UPR adjustable clutch cable GT40 Fuel Tank & pumps, Kenne Bell Boost-a-Pump, 60lb injectors, Vortech T-Trim W/After Cooler, 2.9" RR Pulley Anderson Power Pipe, Accufab Throttle Body (USELESS IMHO), MGW Shifter with the blue handle KB Oil Cooling system, KB Differential Cooler Autometer Phantom boost and fuel pressure guages Kenny Brown Aero Kit, Kooks LT Headers H-Pipe with H-flow cats, Bassani Cat Back Snow Boost Cooler T56 Six Speed Tranny MGW BLING-BLING interior stuff 645RWHP and 558RWTQ

01-21-2003, 05:20 AM	#12
Bad Pony SCMC Member Join Date: Jun 2001 Location: B'ham, AL Posts: 291	Not sure I will make it but we'll see what happens. I'll have my LT's on by then regardless

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