Jerky at low RPMS

rednek01 · 08-12-2009, 12:55 PM

Quote:

Originally Posted by m4a1mustang

I was just thinking about this today and whether or not I should post it here to see if anyone else felt it. +1 rep for reading my mind.

As far as I know, this is normal. Sometimes it happens, sometimes it doesn't. It all depends on how you roll out of the clutch and how much throttle you have applied. My Mustang GT didn't do it with stock 3.27 gears, but when I swapped them out for 4.10s it did buck a bit at times.

Man 4.10's are tempting me so bad!

I think the issue is low end torque there isnt enough for the 3.31 gear in the back of yalls cars or mine for that matter and so the engine is somewhat stalling a bit or struggling. also I think the throttle by wire in both of our cars has a hard time staying smooth at the low low RPM levels.

Nice parallel between our cars tho kind of interesting

m4a1mustang · 08-12-2009, 12:56 PM

Quote:

Originally Posted by rednek01

Man 4.10's are tempting me so bad!

I think the issue is low end torque there isnt enough for the 3.31 gear in the back of yalls cars or mine for that matter and so the engine is somewhat stalling a bit or struggling. also I think the throttle by wire in both of our cars has a hard time staying smooth at the low low RPM levels.

Nice parallel between our cars tho kind of interesting

4.10s and the Mustang will absolutely come alive. I went from running 14 flat with a bone stock 2003 GT to 13.6 with 4.10s. They effectively bitchslapped the car awake. You'll LOVE them.

rednek01 · 08-12-2009, 01:31 PM

Quote:

Originally Posted by m4a1mustang

4.10s and the Mustang will absolutely come alive. I went from running 14 flat with a bone stock 2003 GT to 13.6 with 4.10s. They effectively bitchslapped the car awake. You'll LOVE them.

I think with 4.10's I will dip into the 12's so that would be exciting

Red370 · 08-12-2009, 01:46 PM

Quote:

Originally Posted by rednek01

I think with 4.10's I will dip into the 12's so that would be exciting

my buddy Brian has 4.10's, Vortec SDS, headers, exhaust, and to date his best time is 12.9, he says the 4.10's are great for low end tq, but fall flat on their face in the upper RPM range. They might knock a tenth or two off your time, but dont expect miracles, he says he misses his top end.

m4a1mustang · 08-12-2009, 02:01 PM

Quote:

Originally Posted by Red370

my buddy Brian has 4.10's, Vortec SDS, headers, exhaust, and to date his best time is 12.9, he says the 4.10's are great for low end tq, but fall flat on their face in the upper RPM range. They might knock a tenth or two off your time, but dont expect miracles, he says he misses his top end.

The only issue on a FI car with the 4.10s is you had to shift to 5th (overdrive on the Mustangs) at about 112 MPH.

rednek01 · 08-12-2009, 02:37 PM

Quote:

Originally Posted by Red370

my buddy Brian has 4.10's, Vortec SDS, headers, exhaust, and to date his best time is 12.9, he says the 4.10's are great for low end tq, but fall flat on their face in the upper RPM range. They might knock a tenth or two off your time, but dont expect miracles, he says he misses his top end.

I know a couple of people running 12.8's with CAI, tune, and 4.10's and thats on street tires. I may go with 3.73's tho for a little bit of balance and maybe F.I. someday

m4a1mustang · 08-12-2009, 02:04 PM

Quote:

Originally Posted by rednek01

I think with 4.10's I will dip into the 12's so that would be exciting

With good tires I would think so.