power lost w/ 12bolt?
Re: power lost w/ 12bolt? I know everybody says that they lose rwhp when upgrading to the 12 bolt(I'd imagine its from inertial losses, ie turning a 7.5" ring gear vs a 8.875" ring gear) I don't know what the amount would be but like Bear said the 12 bolt will remove one of the driveline worries so you can let it hang out on the launch to make up for any losses on the dyno <img src="images/icons/smile.gif" border="0">
<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
Re: power lost w/ 12bolt? I was running 12.4's everywhere with a 10 bolt/4.10 combo and a alum. driveshaft on nitto's and launching at 3000 rpms. I installed a 12 bolt/4.10 combo with a steel driveshaft and couldn't better a 12.59 on ET Street launching at 5000 rpm's. I lost a couple tenths or close to it.
Tom
Tom
Re: power lost w/ 12bolt? I lost about 13 rwhp going from a stock rearend with 3.73 gears to my 12-bolt with 4.10 gears.
But, it was definitely worth it! Tow trucks suck.
Tony
But, it was definitely worth it! Tow trucks suck.
Tony
Trending Topics
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: power lost w/ 12bolt? I saw no difference in trap speed or ET when I went to the 9" from the 7.5" and again no difference when I went to the 12-bolt. I'm sure there had to have been some small loss but it was so small that I couldn't detect it.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Re: power lost w/ 12bolt? this sort of makes me feel better. i dynoed and was still aprox 10hp off. i know it may be nothigng to most of ya. but i got guys out there with just cams with 20hp over my heads and cam <img src="gr_sad.gif" border="0">
Re: power lost w/ 12bolt? Well if you liked that Colonel then here's a little more. With stock 3.42's in the 10 bolt it pulled 342rwhp...switched to the 4.10's and pulled 338rwhp on the same dyno with no other changes <img src="gr_images/icons/wink.gif" border="0">
Re: power lost w/ 12bolt? Dynoed 348rwhp(when I still had just bolt ons) with the stock rear and 4.10's...switched to Moser 12 bolt with 4.10's and went to 344rwhp on the same dyno with no other changes.
No noticable loss in ET or MPH at the track.
No noticable loss in ET or MPH at the track.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: power lost w/ 12bolt? [quote]Originally posted by Smoke_ur_5.0:
<strong>Dynoed 348rwhp(when I still had just bolt ons) with the stock rear and 4.10's...switched to Moser 12 bolt with 4.10's and went to 344rwhp on the same dyno with no other changes.
No noticable loss in ET or MPH at the track.</strong><hr></blockquote>
Now that's really good information since you didn't change the ratio. Makes for an apples to apples comparison. <img src="gr_images/icons/cool.gif" border="0">
<strong>Dynoed 348rwhp(when I still had just bolt ons) with the stock rear and 4.10's...switched to Moser 12 bolt with 4.10's and went to 344rwhp on the same dyno with no other changes.
No noticable loss in ET or MPH at the track.</strong><hr></blockquote>
Now that's really good information since you didn't change the ratio. Makes for an apples to apples comparison. <img src="gr_images/icons/cool.gif" border="0">
Re: power lost w/ 12bolt? Here's another direct comparison <img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" />
My 10 bolt with 3.73's made 405crwhp
After the install of "Strange 12 Bolt" I re-dynoed and came up with 394crwhp on the same dyno a few days later.
My trap speeds were off about 1 mile an hour, but the time didn't really change. Just goes to show ya how much track conditions play a roll.
Jim
My 10 bolt with 3.73's made 405crwhp
After the install of "Strange 12 Bolt" I re-dynoed and came up with 394crwhp on the same dyno a few days later.
My trap speeds were off about 1 mile an hour, but the time didn't really change. Just goes to show ya how much track conditions play a roll.
Jim
Re: power lost w/ 12bolt? I dynoed 2 RWHP less with my Strange 12-bolt with 3.42's vs. my 10-bolt with 3.42's. I then swapped out to a CFDS, and it picked up 2 RWHP, so I was right back to where I started. <img src="graemlins/gr_xmas.gif" border="0" alt="[santa]" />
__________________
