03 Cobra rwhp...
11-28-2008, 07:51 AM
#1
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Join Date: Jul 2008
Location: Burnt Hills, NY
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03 Cobra rwhp...
OK, so I've never had my 2003 Cobra to the dyno, but I found this link to cal HP http://www.fastnuf.com/HP%20Est.html
....I've run my Cobra a few times at the track for a mag. shootout with the following:
3800 pounds w/driver & 3/4 tank unleaded racing fuel
2.93 BF pulley w/aux. pulley
JLT CAI
Canned SCT xcal2 tune from RWTD
Flowmaster CB
Nitto DR's
According to my best run of 12.09@117.6 my Cobra is making 482 rwhp (578 hp to flywheel)...Does sound about right??
Since those runs, I've added a Afco HE, PFab HE tank, Bassani catted X & I'm stepping up to Nitto 315 DR's....would like to see an 11.7-11.8
....I've run my Cobra a few times at the track for a mag. shootout with the following:
3800 pounds w/driver & 3/4 tank unleaded racing fuel
2.93 BF pulley w/aux. pulley
JLT CAI
Canned SCT xcal2 tune from RWTD
Flowmaster CB
Nitto DR's
According to my best run of 12.09@117.6 my Cobra is making 482 rwhp (578 hp to flywheel)...Does sound about right??
Since those runs, I've added a Afco HE, PFab HE tank, Bassani catted X & I'm stepping up to Nitto 315 DR's....would like to see an 11.7-11.8
11-28-2008, 05:31 PM
#4
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Join Date: Aug 2004
Location: Orange county, CA
Posts: 505
11-28-2008, 06:22 PM
#5
Banned
Join Date: Nov 2008
Location: AZ
Posts: 100
Don't bother with the headers. Headers are pretty much useless on our cars, until you get ported heads. Have you seen how small the exahust ports are on our heads? Compared to an LS car, they are TINY. You will see extremely minimal gains, with headers.
11-28-2008, 08:59 PM
#7
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11-29-2008, 08:28 AM
#8
6th Gear Member
Join Date: Dec 2005
Location: Florida
Posts: 5,893
If you have 475rwhp with a 2.93, intake/exhaust -- you're within about .5% of Cobra owners.
now maybe with a generous dyno, along with perfect weather.. but, I would say I am almost POSITIVE that your car is around 450 +/- (440-460 TOPS) ... Most cars with a 2.81 or a 2.76 upper pulley pull out high 450's... mine with: intake, exhaust, 2.81 put down 440 in crappy weather (high humidity)
I would stay away from headers... 400 for the headers, 130 for midpipe, and 400 for install.. better off porting your blower and saving money, or throw some nitrous in the car.
The internet program you used uses to many variables.. for instance.. my Mach 1 ran a 13.4 on one run and a 13.8 on another with close to the same 60" and close to the same trap (forget exacts).. the difference? I screwed up in the middle... lost the rear for a split second and had to lay off the gas for a second.. but was still able to make it up on the trap...
The only way to really know what your car is putting down is to pay someone 50 bucks to dyno the car... and if you go in there thinking you're going to see 475-485 you're going to be very disappointed.
now maybe with a generous dyno, along with perfect weather.. but, I would say I am almost POSITIVE that your car is around 450 +/- (440-460 TOPS) ... Most cars with a 2.81 or a 2.76 upper pulley pull out high 450's... mine with: intake, exhaust, 2.81 put down 440 in crappy weather (high humidity)
I would stay away from headers... 400 for the headers, 130 for midpipe, and 400 for install.. better off porting your blower and saving money, or throw some nitrous in the car.
The internet program you used uses to many variables.. for instance.. my Mach 1 ran a 13.4 on one run and a 13.8 on another with close to the same 60" and close to the same trap (forget exacts).. the difference? I screwed up in the middle... lost the rear for a split second and had to lay off the gas for a second.. but was still able to make it up on the trap...
The only way to really know what your car is putting down is to pay someone 50 bucks to dyno the car... and if you go in there thinking you're going to see 475-485 you're going to be very disappointed.
Last edited by xxkazp3rxx; 11-29-2008 at 08:31 AM.
11-29-2008, 08:54 AM
#9
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Join Date: Dec 2005
Location: Florida
Posts: 5,893
Sorry for the double post; but i wanted to break it up...
Using your website I took my best and worst run of the night... 13.470 @ 103.15 mph and 13.785 @ 101.11mph .. just to show you the variation... I used an arbitrary weight, as I really don't know how much my car weighs with me in it... I used 3665 lbs which is probably close to accurate (3465 for car - listed curb weight; 200 for me)..
at 3665 and a 13.470 1/4 mile I got 296rwhp... on the same run my trap was 101.79, and when I tell the cpu my trap was 101.79 it tells me I have 302rwhp...
at 3665 and a 13.785 1/4 mile I got 277rwhp... on the same run my trap was 101.11, and when I tell the cpu my trap was 101.11 it tells me I have 296rwhp...
Which shows two runs and 4 variations.. variations between the twn runs, and even within the same run! Because I have crappy tires and my wheels spin between shifts 1-2; 2-3; 3-4 my trap suffers.. showing me more or less rwhp according to this tool... So are you going to tell me that within 20 minutes my cars rwhp changed by 20rwhp!? That # is completely different. This tool is not a great one... and even though I don't have my exact weight, while that (the difference in the weight that I used and my actual drivers weight) would change the end number... it's not going to change the variation between the two runs and the 4 variations - the same gap in power would be seen, just with a different total number.
The other thing this doesn't account for is my 4.30 rear gear.. that will cause me to run faster, without changing my rwhp numbers in the least.. your 3.55 gears are going to get you faster then say, a GT's 3.27's but slower then someone with 3.73s.
The fact that you had luck with this tool in the past means absolutely NOTHING; pure coincidence. Don't trust it.
Using your website I took my best and worst run of the night... 13.470 @ 103.15 mph and 13.785 @ 101.11mph .. just to show you the variation... I used an arbitrary weight, as I really don't know how much my car weighs with me in it... I used 3665 lbs which is probably close to accurate (3465 for car - listed curb weight; 200 for me)..
at 3665 and a 13.470 1/4 mile I got 296rwhp... on the same run my trap was 101.79, and when I tell the cpu my trap was 101.79 it tells me I have 302rwhp...
at 3665 and a 13.785 1/4 mile I got 277rwhp... on the same run my trap was 101.11, and when I tell the cpu my trap was 101.11 it tells me I have 296rwhp...
Which shows two runs and 4 variations.. variations between the twn runs, and even within the same run! Because I have crappy tires and my wheels spin between shifts 1-2; 2-3; 3-4 my trap suffers.. showing me more or less rwhp according to this tool... So are you going to tell me that within 20 minutes my cars rwhp changed by 20rwhp!? That # is completely different. This tool is not a great one... and even though I don't have my exact weight, while that (the difference in the weight that I used and my actual drivers weight) would change the end number... it's not going to change the variation between the two runs and the 4 variations - the same gap in power would be seen, just with a different total number.
The other thing this doesn't account for is my 4.30 rear gear.. that will cause me to run faster, without changing my rwhp numbers in the least.. your 3.55 gears are going to get you faster then say, a GT's 3.27's but slower then someone with 3.73s.
The fact that you had luck with this tool in the past means absolutely NOTHING; pure coincidence. Don't trust it.
11-29-2008, 08:57 AM
#10
SVT Section Moderator
Thread Starter
Join Date: Jul 2008
Location: Burnt Hills, NY
Posts: 15,601
If you have 475rwhp with a 2.93, intake/exhaust -- you're within about .5% of Cobra owners.
now maybe with a generous dyno, along with perfect weather.. but, I would say I am almost POSITIVE that your car is around 450 +/- (440-460 TOPS) ... Most cars with a 2.81 or a 2.76 upper pulley pull out high 450's... mine with: intake, exhaust, 2.81 put down 440 in crappy weather (high humidity)
I would stay away from headers... 400 for the headers, 130 for midpipe, and 400 for install.. better off porting your blower and saving money, or throw some nitrous in the car.
The internet program you used uses to many variables.. for instance.. my Mach 1 ran a 13.4 on one run and a 13.8 on another with close to the same 60" and close to the same trap (forget exacts).. the difference? I screwed up in the middle... lost the rear for a split second and had to lay off the gas for a second.. but was still able to make it up on the trap...
The only way to really know what your car is putting down is to pay someone 50 bucks to dyno the car... and if you go in there thinking you're going to see 475-485 you're going to be very disappointed.
now maybe with a generous dyno, along with perfect weather.. but, I would say I am almost POSITIVE that your car is around 450 +/- (440-460 TOPS) ... Most cars with a 2.81 or a 2.76 upper pulley pull out high 450's... mine with: intake, exhaust, 2.81 put down 440 in crappy weather (high humidity)
I would stay away from headers... 400 for the headers, 130 for midpipe, and 400 for install.. better off porting your blower and saving money, or throw some nitrous in the car.
The internet program you used uses to many variables.. for instance.. my Mach 1 ran a 13.4 on one run and a 13.8 on another with close to the same 60" and close to the same trap (forget exacts).. the difference? I screwed up in the middle... lost the rear for a split second and had to lay off the gas for a second.. but was still able to make it up on the trap...
The only way to really know what your car is putting down is to pay someone 50 bucks to dyno the car... and if you go in there thinking you're going to see 475-485 you're going to be very disappointed.
No plans on adding headers! ...I did just install my Bassani Catted X, also came with the straight pipes if I need them! ....Never disappointed, well see what happens comes spring...my rule of thumb at the track is to pick up 1 mph = 10 hp, so, with my heavy Cobra and an additional 7.6 mph, I feel that's a little more then 450hp! ....How can my 91 GT be so close and when my Cobra was "stock" be sp close?
Last edited by Timspony; 11-29-2008 at 09:01 AM.