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Old 10-23-2007, 10:19 AM   #1
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2001 Mustang GT

I recently just purchased this and added new air intake, I know the exhaust was modified cause it sounds way to loud for normal gt (sounds awesome) Havent had a chance to roll under there and see what the previous owner did to it yet... Any advice to give me so I can know what mods the former owner did, perfamce chip, gears, throttle, etc.. It runs about 3000 rpm at 80 mph... Also need advice to how hard/easy installing a styling bar is?
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Old 10-23-2007, 10:21 AM   #2
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Re: 2001 Mustang GT

3000 rpm at 80 ... I'm guessing you may have 4.10 gears. To check to see if it has a chip look at your PCM behind the passenger kick panel. If you have one you'll see it.
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Old 10-23-2007, 10:31 AM   #3
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Re: 2001 Mustang GT

Cool Thanks!
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Old 10-23-2007, 11:02 AM   #4
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Re: 2001 Mustang GT

You can also try this Interactive RPM and MPH Computation or this one Ford Mustang: Mustang Tech: Calculators & Decoders: Calculate Gear Ratio


80 MPH with 4:10 you should be turning 3,800 RPM with 28 inch tires (You need to know your tire Diameter to get the correct reading ),With 26 inch tires with 4:10 at 80 MPH your turning 4240 RPM

I doubt you have 4:10's more like 2.73, 3.08
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Old 10-23-2007, 11:26 AM   #5
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Re: 2001 Mustang GT

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Originally Posted by Herbstang View Post
You can also try this Interactive RPM and MPH Computation or this one Ford Mustang: Mustang Tech: Calculators & Decoders: Calculate Gear Ratio


80 MPH with 4:10 you should be turning 3,800 RPM with 28 inch tires (You need to know your tire Diameter to get the correct reading ),With 26 inch tires with 4:10 at 80 MPH your turning 4240 RPM

I doubt you have 4:10's more like 2.73, 3.08
Herb ... you forgot to change the transmission gearing ratio. Those RPM's you quoted are for 3rd gear in an auto and 4th gear in a manual. You need to change the "1" to .7 for an auto or .67 for a manual.
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Old 10-23-2007, 01:17 PM   #6
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Re: 2001 Mustang GT

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Herb ... you forgot to change the transmission gearing ratio. Those RPM's you quoted are for 3rd gear in an auto and 4th gear in a manual. You need to change the "1" to .7 for an auto or .67 for a manual.
Damn Your Good !!!!!. using the .67 and 25 inch tire I got 2955 I stand corrected Now all we need to know is it a auto or stick and tire size for the 2nd link to get the gear ratio
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Old 10-23-2007, 08:44 PM   #7
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Re: 2001 Mustang GT

Not sure of tire size yet.. Only had 2 weeks and with work an such havent really checked it out.. Havent even scraped glue from window stickers... It is an auto (i know, i know.. I wanted a stick but also yellow drop top, n didnt wanna drive cross country for it) so suto worked... wasnt on freeway today buy at 65mph it was at jus over 2500 rpms... im almost pos its at 3 going 80 if i can recall... I wanna get a new throttle body, perhaps 75mm but everyone says I will get a sticky gas pedal.. hmmm
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Old 10-23-2007, 09:04 PM   #8
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Re: 2001 Mustang GT

i have a 75mm accufab t-body and my gas pedal isnt sticky, but i have a cai and a 75mm upper intake plenum.
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Old 10-23-2007, 09:07 PM   #9
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Re: 2001 Mustang GT

How did it change he acceleration? Better from the start or in 3rd or 4th? I heard there sticky until there broken in? u install urself? if so how easy was it, looks pretty easy? I thin u have a vert, u got a stylin bar?
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Old 10-23-2007, 09:21 PM   #10
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Re: 2001 Mustang GT

no styling bar i am saving for a cage. yes i did everything myself xcept for paint and the body kit. i cant tell u how it helped xceleration cause i put on the t-body an x-pipe and a diablo predator, at the same time.
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Old 10-23-2007, 09:24 PM   #11
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Re: 2001 Mustang GT

can i ask y u would rather a styling bar over a 4 or 6 pt cage?
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Old 10-23-2007, 09:39 PM   #12
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Re: 2001 Mustang GT

never really looked into cages.... Just know stylin bar kinda breaks up the vert so it looks pretty cool... Hows the diablo working? u running 93 octane? ive nothing but bad about diablo..
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Old 10-23-2007, 10:07 PM   #13
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Re: 2001 Mustang GT

the diablo is good i guess i havent had it on a dyno yet or tried other tuners. yes it is the 93 octane tune. oh yeah i dont have overdrive enabled. it feels more responsive with out it
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Old 11-03-2007, 02:04 AM   #14
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Re: 2001 Mustang GT

i had a MAC Throttle body and had a sticky throttle (felt like pulling two magnets apart). for a n/a bolton setup the gains for a TB/Plenum combo are minimal at best, and not worth the issues if you get the sticky throttle, hanging throttle, etc.

at those RPM's its definately geared. i think a 4r70w with stock gearing (2.73s) in OD (4th) pulls like 2100rpm @ 80mph (thats what my tbird did at least).

this is the hardest part about buying previously modified vehicles. unless you knew the owner well or got a full list, its pretty hit and miss until you either figure it all out or replace parts anyways just to know that you did it, a "Peace of Mind" thing i guess. I had this issue when i got my 03 Cobra the first time, really didnt know what was done, pretty vague, then i sold it to a local and kept in contact, and now that i repurchased id i know exactly what was done, and the quality and workmanship behind said mods.
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