Computer Questions????

jack · 11-13-2004, 12:19 AM

I have a friend that would like to do a few things to his cobra without computer help. I was told today that the 2.93 pulley would not need a chip or programmer but with the 2.80 you would? Is this correct? He would like to add the 2.93 pulley, air filter and maybe a UPR idler pulley. This came from a reputable shop. thanks for the help

ausie · 11-13-2004, 08:09 AM

I would be cautious about changing the boost without checking the fuel/air curve to make sure you are running where it should. You don't want it to run too lean so I would at least dyno it for the mod. Just my opinion.

InfamousSVT · 11-13-2004, 08:15 PM

I'm not sure about that, but I've been told that the Cobra's run pretty rich from the factory, so I guess a little bit more air wouldn't hurt! Just to be safe I'd get the air/fuel ratio checked though!

**Firme** · 11-13-2004, 09:30 PM

You can run higher boost on the 03/04's with the stock PCM, AS LONG AS IT KNOW WHATS GOING ON.

for some enlightenment on the subsject, read this post

http://www.svtcobraclub.com/forums/s...ead.php?t=5909

in the bolded area, the third paragraph, counting the first line.

SVTcobra04 · 11-15-2004, 08:07 AM

cars shore are smart these days.

InfamousSVT · 11-15-2004, 08:30 AM

Quote:

Originally Posted by Firme

You can run higher boost on the 03/04's with the stock PCM, AS LONG AS IT KNOW WHATS GOING ON.

for some enlightenment on the subsject, read this post

http://www.svtcobraclub.com/forums/s...ead.php?t=5909

in the bolded area, the third paragraph, counting the first line.

Oh, so that's how it's supposed to be done

??? I still don't completely understand, that's why I'm glad there are people like Jerry out there!

ORANGE CRUSH · 11-16-2004, 07:27 PM

03 and 04 Cobras come with a 3.65" pulley with approx 8-10 Lbs of boost. These cars do run alittle rich but to be safe always get a Dyno tune if you change the pulley. You can go down to a 3.4" pulley and get 10 -12 Lbs and be relitively safe or go down to a 3.2" pulley with 11 - 14 Lbs and may be close to detination at high temps. DO NOT go under a 3.2" pulley without a chip and Dyno tune.

cobra2112 · 11-16-2004, 10:14 PM

My 04 air to fuel (on the dyno) started around

13.2:1 @2500rpm
12.4:1 @4500rpm
11.6:1 @6200rpm

pretty steady slope down as rpm went up. The dyno tech seemed to be ok with the numbers and said its running on the safe side. With talking to some friends they told me 13:1 range is pretty lean. They did not mention anything to do with rpm though. Just wondering what you guys think. The car has a pulley(6lb), predator tune, CAI, and throttlebody.

11-13-2004, 12:19 AM	#1
jack Registered User Join Date: Oct 2004 Location: Rutledge, TN Posts: 141	Computer Questions???? I have a friend that would like to do a few things to his cobra without computer help. I was told today that the 2.93 pulley would not need a chip or programmer but with the 2.80 you would? Is this correct? He would like to add the 2.93 pulley, air filter and maybe a UPR idler pulley. This came from a reputable shop. thanks for the help

11-13-2004, 08:09 AM	#2
ausie Don't let the dog drive Join Date: Apr 2004 Location: Kinston, NC Posts: 1,883	I would be cautious about changing the boost without checking the fuel/air curve to make sure you are running where it should. You don't want it to run too lean so I would at least dyno it for the mod. Just my opinion. __________________ 2004 SVT Cobra, Silver, February 2004 SVT Build # 2485 out of 3768 SLP Loudmouth Cat-back UPR double lock firewall adjuster UPR GMS extreme double hook quadrant Wheels: Ford SVT 10th anniv. wheels (track duty) SVE 10th anniv. style 17x9F, 10x10.5R BBS RK Plasma 18x8.5F, 18x10R (retired) (retired) 2001 black SVT Cobra, October 2001 missed but not forgotten

11-13-2004, 08:15 PM	#3
InfamousSVT Registered User Join Date: Oct 2004 Location: Gastonia, NC Posts: 1,960	I'm not sure about that, but I've been told that the Cobra's run pretty rich from the factory, so I guess a little bit more air wouldn't hurt! Just to be safe I'd get the air/fuel ratio checked though! __________________ 1994 Black on Black SVT Coupe 2004 SVT Cobra Competition Orange - SOLD 1979 Ghia Coupe - SOLD 1994 Chevy S-10 - DailyDriver

11-16-2004, 07:27 PM	#7
ORANGE CRUSH Registered User Join Date: Sep 2004 Location: Northwest Houston Posts: 1,140	03 and 04 Cobras come with a 3.65" pulley with approx 8-10 Lbs of boost. These cars do run alittle rich but to be safe always get a Dyno tune if you change the pulley. You can go down to a 3.4" pulley and get 10 -12 Lbs and be relitively safe or go down to a 3.2" pulley with 11 - 14 Lbs and may be close to detination at high temps. DO NOT go under a 3.2" pulley without a chip and Dyno tune. __________________ 2012 Comp Orange BOSS #199 Mods Track Key, Airaid CAI, Magnaflow AB, FR-P springs, MM CC plates, FR-relo Brackets, J&M LCA, J&M adj-Panhard bar, MGW shifter

11-15-2004, 08:07 AM	#5
SVTcobra04 Registered User Join Date: Oct 2004 Location: md Posts: 205	cars shore are smart these days.

11-16-2004, 10:14 PM	#8
cobra2112 Registered User Join Date: Jun 2004 Location: Northeast Philly Posts: 53	My 04 air to fuel (on the dyno) started around 13.2:1 @2500rpm 12.4:1 @4500rpm 11.6:1 @6200rpm pretty steady slope down as rpm went up. The dyno tech seemed to be ok with the numbers and said its running on the safe side. With talking to some friends they told me 13:1 range is pretty lean. They did not mention anything to do with rpm though. Just wondering what you guys think. The car has a pulley(6lb), predator tune, CAI, and throttlebody.

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