New here have a few questions!

TCB247 · December 7th, 2011, 02:29 AM

Okay, so I just bought a 99 cobra about two months ago. I wanted to get some opinions about the car. First off I love it and I used to be a big bowtie fan, however I am no longer! First things first. I did some research and I think the car has a 4.10 or 4.30 gear as running about 75/80mph on the highway I am just over 3k rpms. This could be wrong but just what I have gathered. The car has a Vortech E-trim kit on it. BBK long tube headers, full exhaust with high flow cats. Not really sure if any of the bottom end or heads have been messed with. The car only has 50k on it and Runs like a champ. I have no idea what kind of tune the car has and I havent had the time to take it to a shop. I was just wondering what some of you guys could predict as far as rwhp numbers the car might put down, and if I am correct about the gearing. Also the car has 295/35R18 I dont know if that inch is enough to really make that much a of a difference with the speedo. Any information/opinions would be greatly appreciated.
Oh, almost forgot. Would like to get some opinions on getting a new bottom end. I live in Atl GA and didnt know if I should go with a local shop to build it.

3valveStallion · December 7th, 2011, 03:32 AM

depending on what gear you were in, I think you have 3.73s , 4.10s are a possibility. all in all it sounds like you scored a nice Mustang & Welcome

azure mach! · December 7th, 2011, 03:40 AM

what PSI are you running your vortech at?

TCB247 · December 7th, 2011, 04:39 AM

3k at 75/80 is in 5th gear.
Umm I am not sure exactly how much boost. I really dont drive her too hard that much. But I know a few times I have glanced over at the gauge at 5-6k it looks to be about 8psi give or take. I would like to take it up to 12 or 14 once I get a forged bottom end.

Tang Stang · December 7th, 2011, 08:44 AM

If you want to know for certain what gears you have, place the rear axle on jackstands, place the transmission in neutral, and count the number of driveshaft revolutions it takes to make one complete turn of the tire. If the gears have been changed, you don't know if the speedometer has been corrected, so the XXXX rpm @ XX MPH isn't particularly accurate. The altered tire circumference will also throw that off.

TCB247 · December 8th, 2011, 01:34 AM

Anyone with a guess on rwhp?

glittle75 · December 8th, 2011, 05:55 AM

id say probly low 400s.

T.Richardson · December 12th, 2011, 03:37 AM

depending on how much PSI your running, I would say high 300 to the wheels.

swervo · December 12th, 2011, 03:43 AM

I would say mid to low 400s. I've seen many mach's with superchargers running around there with that much boost. I know my mach with twin turbo's and minimal timing put down 460 at the wheels. There is an awesome engine shop right there in Marrietta, GA called Proline Racing. Pro Line Racing

WickedSnake00 · December 12th, 2011, 08:36 AM

I plugged the numbers into one of the handy axle ratio optimization sheets I created for work and came out with this:

Assuming the T3650 has a 0.68 top gear, your tires are 772 rev/mi (295/35R18), I plugged those in to find approximate gear ratios.

80mph with 4.30:1 RAR puts you at 3009 RPM. Sounds about what you were guessing? If it were 4.10:1 it would only be 2869 RPM at 80 mph.

December 7th, 2011, 02:29 AM	#1
TCB247 Newbie Join Date: Nov 2011 Posts: 11 iTrader: 0 reviews	New here have a few questions! Okay, so I just bought a 99 cobra about two months ago. I wanted to get some opinions about the car. First off I love it and I used to be a big bowtie fan, however I am no longer! First things first. I did some research and I think the car has a 4.10 or 4.30 gear as running about 75/80mph on the highway I am just over 3k rpms. This could be wrong but just what I have gathered. The car has a Vortech E-trim kit on it. BBK long tube headers, full exhaust with high flow cats. Not really sure if any of the bottom end or heads have been messed with. The car only has 50k on it and Runs like a champ. I have no idea what kind of tune the car has and I havent had the time to take it to a shop. I was just wondering what some of you guys could predict as far as rwhp numbers the car might put down, and if I am correct about the gearing. Also the car has 295/35R18 I dont know if that inch is enough to really make that much a of a difference with the speedo. Any information/opinions would be greatly appreciated. Oh, almost forgot. Would like to get some opinions on getting a new bottom end. I live in Atl GA and didnt know if I should go with a local shop to build it.

December 7th, 2011, 08:44 AM	#5
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,960 iTrader: 2 reviews	If you want to know for certain what gears you have, place the rear axle on jackstands, place the transmission in neutral, and count the number of driveshaft revolutions it takes to make one complete turn of the tire. If the gears have been changed, you don't know if the speedometer has been corrected, so the XXXX rpm @ XX MPH isn't particularly accurate. The altered tire circumference will also throw that off. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

December 8th, 2011, 05:55 AM	#7
glittle75 Enthusiast 2003 Mach 1 Join Date: Apr 2011 Location: NC Posts: 726 iTrader: 0 reviews	id say probly low 400s. __________________ 2003 Azure Blue Mach 1 - KB, Suspension, Bolt-ons. 497hp, 460tq.

December 12th, 2011, 08:36 AM	#10
WickedSnake00 MM's king of Neon's 404 - car not found 17.81@87 Join Date: Aug 2010 Location: Diesel Engine Capital of the World, Columbus, IN Posts: 7,373 iTrader: 0 reviews	I plugged the numbers into one of the handy axle ratio optimization sheets I created for work and came out with this: Assuming the T3650 has a 0.68 top gear, your tires are 772 rev/mi (295/35R18), I plugged those in to find approximate gear ratios. 80mph with 4.30:1 RAR puts you at 3009 RPM. Sounds about what you were guessing? If it were 4.10:1 it would only be 2869 RPM at 80 mph. __________________ Official Secondhand Snake Build Thread Here Looks Like a Cobra, Sounds Like a Cobra, Tastes Like a Cobra, Not a Cobra. For Sale: P71 Interceptor motor

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December 7th, 2011, 04:39 AM	#4
TCB247 Newbie Join Date: Nov 2011 Posts: 11 iTrader: 0 reviews	3k at 75/80 is in 5th gear. Umm I am not sure exactly how much boost. I really dont drive her too hard that much. But I know a few times I have glanced over at the gauge at 5-6k it looks to be about 8psi give or take. I would like to take it up to 12 or 14 once I get a forged bottom end.

December 8th, 2011, 01:34 AM	#6
TCB247 Newbie Join Date: Nov 2011 Posts: 11 iTrader: 0 reviews	Anyone with a guess on rwhp?

December 12th, 2011, 03:37 AM	#8
T.Richardson Newbie 1996 Mustang GT Join Date: Dec 2011 Location: Hagerstown Posts: 19 iTrader: 0 reviews	depending on how much PSI your running, I would say high 300 to the wheels.

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