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View Full Version : Whats wrong with my snake?


Black2003Vert
05-21-2006, 12:04 AM
I have an 03 Cobra that was dyno tuned by Murillo Motorsports in San Antonio. At the time it had the Steeda cold air box, Reichard racing 2.80 upper pulley, ported blower, and a set of Flows. I then added an off road H-pipe, Magnaflow catback, and it only made 442 at the wheels. Two weeks ago I added the C&L pipe, Accufab throttle body and plenum, lightning force heat exchanger, and a 4 lb lower. I raced a guy with intake, upper pulley, exhaust, x pipe, and diable tuner, and he smoked me. Does anybody know whats up with my car?

03slidewayzSVT
05-21-2006, 12:11 AM
there is something seriously wrong with your tune :eek: or you have something wrong in the motor:doubt: ..... mine made 522/551 with almost everything you have:) Where do you live?????

InfamousSVT
05-21-2006, 04:28 AM
What kind of tune do you have? A/F ratio etc....

Also, the 442rwhp numbers may be due to the type of dyno you were on. Either way it doesn't matter, but you should get a new tuner. I don't know your location but I'd try searching and talking to another tuner that could help you out. :thumbsup:

blk04cobra1
05-21-2006, 01:13 PM
It looks like on their website that's it's either a Mustang dyno or a dyno dynamics...if this is the case, then your numbers are probably dead on, just would read a little higher on a dynojet. It still seems however that your "area under the curve" may be struggling if you cant keep up with a lightly modified cobra. If you can post up your dyno graph, it may help us try to shed some light for you :thumbsup:

FactoryFreak197
05-21-2006, 03:56 PM
I was just in that area, its hott, you need to take the air temperature in mind, you numbers will be down one of my original dyno numbers was 473, and 496 tq, and when it was redynod about a month ago when its was hott, it dropped down to 452, and 480 tq. My recent numbers are 490 and 508 tq, recheck your air/fuel was it pretty steady in the 11.5 to 12 range, that where mine is, I have similiar mods, and mine is a vert. like yours. The car is heavier too, you need to take into account that as well. my mods include 2.76 billetflow upper pulley, ford gt pumps, Kooks longtubes, LFP intercooler reservoir and HE, Billetflow IRS brace, SCT tune by HPP racing, MGW shifter, with a stock eaton and now lowers. Try putting it on a diet, im doing the rear seat delete and Chrome-moly tubular K-member.:D

cobrabob
05-22-2006, 07:29 PM
What is your psi at? Sounds like a possible blow buy in your blower. With your mods, you should be at least 13-15 psi.

Black2003Vert
05-23-2006, 01:21 AM
there is something seriously wrong with your tune :eek: or you have something wrong in the motor:doubt: ..... mine made 522/551 with almost everything you have:) Where do you live?????


San Antonio, TX

Black2003Vert
05-23-2006, 01:22 AM
It looks like on their website that's it's either a Mustang dyno or a dyno dynamics...if this is the case, then your numbers are probably dead on, just would read a little higher on a dynojet. It still seems however that your "area under the curve" may be struggling if you cant keep up with a lightly modified cobra. If you can post up your dyno graph, it may help us try to shed some light for you :thumbsup:
It was a dyno jet

Black2003Vert
05-23-2006, 01:24 AM
What is your psi at? Sounds like a possible blow buy in your blower. With your mods, you should be at least 13-15 psi.
I'm not sure. I still have the factory boost gauge. It pegs past 10 lbs

Linn@Amazon
05-23-2006, 12:51 PM
is it hard to say without having any data to look at to see what is going on with the car..did they datalog any of the dyno runs? what is your timing and A/F?


does seem low for your mods if it is a Dyno Jet

Riversnake
05-23-2006, 02:48 PM
Def sounds low. I made 479hp/498tq with exhaust, CAI, 2.80 upper and SCT tune at Dynospeed (conservative tune).

cobrabob
05-24-2006, 10:49 AM
I had to go with a Auto Meter to get a proper reading on my boost. If the vains in your blower are even slightly worn you will loose boost, results less power. The internals of these engines are pretty much bullet proof. The tune can be tricky. Installed my auto meter was $225, not much for a good reading.