Mustang Doesnt Coast Well - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 05-20-2012 Thread Starter
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Mustang Doesnt Coast Well

Call me crazy, but it seems that every other car I drive coasts very well when letting off the gas going 60+ MPH. When I am coming up to a ram to get off of the highway, I can let off the gas at around 200-300 feet and any car (except my Mustang) will coast onto the ramp.

My Mustang is a different story. As soon as I let off the gas it seems to drastically lose power, and does not coast well at all as if something is holding it back. If I let off the gas to coast to a ramp 200-300 feet out, I find myself having to give it more gas.

Would this be due to drag since I have heavy ass 315s in the back? Possibly dragging brakes?


It's a Mustang GT. A Ford product. Need I say more?
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post #2 of 6 (permalink) Old 05-20-2012
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Originally Posted by NJ98GT View Post
Call me crazy, but it seems that every other car I drive coasts very well when letting off the gas going 60+ MPH. When I am coming up to a ram to get off of the highway, I can let off the gas at around 200-300 feet and any car (except my Mustang) will coast onto the ramp.

My Mustang is a different story. As soon as I let off the gas it seems to drastically lose power, and does not coast well at all as if something is holding it back. If I let off the gas to coast to a ramp 200-300 feet out, I find myself having to give it more gas.

Would this be due to drag since I have heavy ass 315s in the back? Possibly dragging brakes?
Put the car in neutral, don't set the e-brake, jack up the rear, and try to turn the wheels. They should turn without too much resistance. There will be a little resistance due to the drivetrain, but you should notice if the brakes are sticking. Do the same for the front end. My front driver side caliper is sticking slightly, while the passenger side turns just fine. I don't really notice it while I am driving, though I ought to get it fixed soon. I just don't feel like paying someone to do it when I can do it myself. Just gotta get around to it, lol! Anyway, Come back to us after you've checked this.

Also, if you haven't already, maybe changing the transmission and gear fluid could help? I doubt it would have any effect, but who knows!


2003 Mustang GT
Intake & Exhaust: K&N FIPK CAI, Mac O/R H-Pipe, Custom Catback w/ Magnaflow Magnapack Mufflers.
Suspension: H&R Super Sport Springs, KONI STR.T Shocks & Struts, J&M Caster Camber Plates, Steeda Bumpsteer Kit, UPR Elite LCA's & UCA's.
Performance: BAMA 93R Custom Tune, FRPP 4.10 Gears w/ Terminator spec T-Lok.
Planned Mods: FLSFC, Eibach Sway Bars, Throttle Body, Plenum, Rims.
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post #3 of 6 (permalink) Old 05-20-2012 Thread Starter
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Thanks for the feedback. The gear oil should be good as I recently got 4.10s and it has FRESH Royal Purple back there. The tranny fluid was changed a year ago, and is still red.

I'm pretty sure the brakes in the back are SHOT. The calipers, pads and rotors. I have squeaking back there while the car is moving, and the floating brackets are seized I think. Also, not too long ago a brake pad just fell out while driving I chewed up the inside of the drive side rotor. Threw another pad in there as it was winter, and I was too cold/lazy to pull everything out for replacement. Maybe it's time.

I have the Bullet calipers and setups for the fronts, so maybe I should do everything in one shot.

It's a Mustang GT. A Ford product. Need I say more?
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post #4 of 6 (permalink) Old 05-20-2012
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Well, a new set of brakes should definitely be a priority for you, regardless! Safety is important

2003 Mustang GT
Intake & Exhaust: K&N FIPK CAI, Mac O/R H-Pipe, Custom Catback w/ Magnaflow Magnapack Mufflers.
Suspension: H&R Super Sport Springs, KONI STR.T Shocks & Struts, J&M Caster Camber Plates, Steeda Bumpsteer Kit, UPR Elite LCA's & UCA's.
Performance: BAMA 93R Custom Tune, FRPP 4.10 Gears w/ Terminator spec T-Lok.
Planned Mods: FLSFC, Eibach Sway Bars, Throttle Body, Plenum, Rims.
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post #5 of 6 (permalink) Old 05-20-2012
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my car while the clutch is in or in neutral coast just fine, try doing like DJA said and try to spin the tires and feel for any stiffness in the turning

2016 Mustang GT 5.0 Magnetic Metallic Performance Package
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post #6 of 6 (permalink) Old 05-21-2012
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Like started above check to make sure you can free wheel all wheels. Do you have the same problem when costing in neutral?? Remember when your in a gear and you go into a cost you will get resistance from the lower rpm drag of the engine, unlike an auto.

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DB-Performance Tune: 634rwhp @ 6000rpm , 609rwtq @ 4000rpm, (500rwtq @ 2500rpm)

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