How much HP / tenths do you you lose but swapping to 12 bolt or 9inch ?
09-24-2007, 01:17 AM
#1
TECH Enthusiast
Thread Starter
iTrader: (6)
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 572
Likes: 0
Received 0 Likes
on
0 Posts
How much HP / tenths do you you lose but swapping to 12 bolt or 9inch ? How much HP are you expected to lose when you switch to a 9inch or a 12 bolt rear end ?
I'm guessing since the rear end in heavier, youre gonna lose some hp on the dyno and run a few tenths higher in the 1320 ?
I'm guessing since the rear end in heavier, youre gonna lose some hp on the dyno and run a few tenths higher in the 1320 ?
09-24-2007, 01:37 AM
#2
TECH Addict
iTrader: (6)
Join Date: Aug 2006
Location: Schiller Park (NW burb of Chicago)
Posts: 2,310
Likes: 0
Received 0 Likes
on
0 Posts
dyno numbers are usually meaningless, it varies car by car, the gears, m6 or stalled auto, etc...as for dyno times, you should be able to run better...with a stronger rear, you can launch the car better than if you pussyfoot around trying to extend the life of your 10 bolt... if you can cut better 60ft times, hopefully you can pull a better quarter...
09-24-2007, 10:23 PM
#3
TECH Fanatic
Its going to be Infinitesimal.
Why is it that everyone splits hairs over this very question ?? Its not going to make you any faster... or any slower for that matter. If anything... a 9 will be slower due to it being more inefficient from the pinion being further off centerline and it being a little heavier.
Why is it that everyone splits hairs over this very question ?? Its not going to make you any faster... or any slower for that matter. If anything... a 9 will be slower due to it being more inefficient from the pinion being further off centerline and it being a little heavier.
09-25-2007, 07:48 AM
#5
12 Second Club
iTrader: (14)
Join Date: Sep 2005
Location: ILLINOIS
Posts: 1,193
Likes: 0
Received 0 Likes
on
0 Posts
Well I would think for me going from a 10 bolt on nittos with stock 3.42 to a 12 bolt or a 9 inch with 4.10's and some mickey thomsons would shave a couple tenths not add them.
09-25-2007, 12:35 PM
#7
Originally Posted by chicane
Its going to be Infinitesimal.
Why is it that everyone splits hairs over this very question ?? Its not going to make you any faster... or any slower for that matter.
Why is it that everyone splits hairs over this very question ?? Its not going to make you any faster... or any slower for that matter.
Trending Topics
09-26-2007, 12:59 PM
#8
TECH Fanatic
Yup yup.
The air temperature and local air density changes will effect your times more than the addition of a 9" or 12bolt differential.
.2 is more likely related to the driver than anything else.
The air temperature and local air density changes will effect your times more than the addition of a 9" or 12bolt differential.
.2 is more likely related to the driver than anything else.
09-26-2007, 07:34 PM
#10
11 Second Club
iTrader: (11)
Join Date: Sep 2004
Location: Cincy, Oh.
Posts: 200
Likes: 0
Received 0 Likes
on
0 Posts
I killed my 10 bolt on the run right after my first 12.9; car was stock heads/cam then. Got the 9" in, got used to it, pinion set right, etc. and ended up with a 12.4. It helps when you can leave the line at whatever RPM you want without having to worry about the rear end breaking.
I'll admit, I am really curious what kind of dyno #s the car would put down now with a 10 bolt.
I'll admit, I am really curious what kind of dyno #s the car would put down now with a 10 bolt.
