possible 1/4 mile time increase
Thread Starter
Instructor
Joined: Sep 2007
Posts: 218
Likes: 7
From: Tonbridge, Kent
possible 1/4 mile time increase
Hi,
At the moment i have run 13.4 @ 105 mph on a concrete track over the 1/4 mile, with 400bhp & 390 ft lb with a 2400 stall converter in a th200r4 trans, and a 3.08 diff and stock type BFG'S.
I am changing to a 3.55 diff and i'm wondering what sort of drop in 1/4 mile E.T'S i'd be looking at with the different diff ratio?
The cccuk are doing a race series this year and i'm looking forward to running at santa pod for the first time and geting some traction off the line.
Peter
At the moment i have run 13.4 @ 105 mph on a concrete track over the 1/4 mile, with 400bhp & 390 ft lb with a 2400 stall converter in a th200r4 trans, and a 3.08 diff and stock type BFG'S.
I am changing to a 3.55 diff and i'm wondering what sort of drop in 1/4 mile E.T'S i'd be looking at with the different diff ratio?
The cccuk are doing a race series this year and i'm looking forward to running at santa pod for the first time and geting some traction off the line.
Peter
Last edited by knodty; May 14, 2009 at 05:09 PM.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 218
Likes: 7
From: Tonbridge, Kent
It should say on my profile what i have done!!
454 + 30 FLAT TOP PISTONS, EDELBROCK PERFORMER RPM SERIES, 750 CARB, HEADS, INTAKE AND CAM.
Last edited by knodty; May 14, 2009 at 05:14 PM.
Safety Car
Joined: Oct 2004
Posts: 3,924
Likes: 735
From: Youngstown Ohio
Hi,
At the moment i have run 13.4 @ 105 mph on a concrete track over the 1/4 mile, with 400bhp & 390 ft lb with a 2400 stall converter in a th200r4 trans, and a 3.08 diff and stock type BFG'S.
I am changing to a 3.55 diff and i'm wondering what sort of drop in 1/4 mile E.T'S i'd be looking at with the different diff ratio?
The cccuk are doing a race series this year and i'm looking forward to running at santa pod for the first time and geting some traction off the line.
Peter
At the moment i have run 13.4 @ 105 mph on a concrete track over the 1/4 mile, with 400bhp & 390 ft lb with a 2400 stall converter in a th200r4 trans, and a 3.08 diff and stock type BFG'S.
I am changing to a 3.55 diff and i'm wondering what sort of drop in 1/4 mile E.T'S i'd be looking at with the different diff ratio?
The cccuk are doing a race series this year and i'm looking forward to running at santa pod for the first time and geting some traction off the line.
Peter
http://www.tciauto.com/Products/Tech...alculators.asp
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
thank you..
Le Mans Master
Joined: May 2002
Posts: 5,086
Likes: 786
From: Lebanon Township New Jersey
When I changed from 3.08 to 3.73 gears, my best ET dropped almost 5 tenths. That was on BFG TA radial street tires. I actually ran a few 12.80s on those tires, at 104/105 but ETs were very erratic. On drag radials I've gone 12.68, with very consistent 12.7s. Your 60 ft times are the key.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 218
Likes: 7
From: Tonbridge, Kent
and it was done on a chassy dyno (rolling road) and it was giving about 340 bhp at the wheels if i remember right!! and final engine figures were given through the drag created through the diff and trans i think. So i doubt i'll get much more that 1/2 sec off my times over the 1/4 mile depending on traction and 60 ft times.
Never had any 60 ft times yet as the only track i have run at is not that great
Roll on the pod
for you repliesPeter
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