I have heard about the powerloss through numerous trannys out there and would like to get the chance to see the actual difference there too... but when my car is too heavy for a glide and too powerfull for a th350... well that kinda leaves you with a few options.
From: "Clint Hooper" <[EMAIL PROTECTED]> Reply-To: The Chevelle Mailing List <[EMAIL PROTECTED]> To: "The Chevelle Mailing List" <[EMAIL PROTECTED]> Subject: Re: [Chevelle-list] 12 bolt advice Date: Sun, 28 Sep 2003 23:56:27 -0500
You should be losing around 15% through a manual trans and around 18%
through an auto trans,unless you're really running a loose converter. On our
ZR-1's,we use a conversion factor of .85 to figure our hp at the clutch.
Sorry about the 3rd member goof. What I meant was a mag center section.
Another potential problem with Dana 60's is a small selection of gear
ratios. Lots of high numerical ratios but not many low numerical ones. A 9"
has the best selection there.
Yeah,Toyota does put some good stuff in their drivelines. Supra twin-turbos
are another example.
Clint Hooper
H&H Custom,owner
LT5 Registry Director
http://www.LT5Registry.net/
ACES #1650
http://dalesplace.com/misc/friends/clint_hooper.htm
----- Original Message -----
From: Capt Crunch <[EMAIL PROTECTED]>
> That is exactly what we did on a Mustang chassis dyno. Only differences
were
> a tiny amount of driveshaft weight/length and the rear ends (9" and 12b).
> Also a quick run through frictional lose through different types of gear
> cuts varifies this scientifically as well. Clint you are right that 5%
isn't
> much, but I know personally I get sick hearing that I'm losing 25% or
> sometimes more of my power through my drivetrain. Maybe I'm just to
uptight
> LOL.
>
> I have heard a lot of varying info on the d60 weights. I know that a
couple
> of the rear end companies report a d60 weighs only 15 or 20 lbs. more than
a
> HD case or back braced Ford 9" (no alum parts). Also an article in Super
Rod
> magizine (Oct. 2003) stated that a d60 weighed about 30 lbs. more then a
> back braced or HD casing 9", but I have never weighed them myself.
> Regardless though, this is unsprung weight and is not really a good place
to
> add weight. A Third member? a d60 doesn't have a third member... a Mopar
8
> 3/4 rear would have a drop out style carrier though.
>
> In the end I think it is kinda 4 of one and 2+2 of the other... comes down
> to preference. Overall I do agree with some of the others... the 12B will
> handle alot with some aftermarket axles, reinforcing cover,
> and welded axle tubes. I currently run a 8.2 BOP rear in my car with a
> reinforcing cover and so far so good... although we have yet to get the
> slicks on inlew of the DR's and the past combos have all been larger cube
> small blocks. This axle has bolt in axles similar to a 9" and the axle
> shafts actually test out stronger then a 12B. Weaknesses are obviously the
> pinion gear size and the stock posi units are pretty weak.
>
> On a side note: I still personally love the Toyota rear axles... those
> things are amazing! Axles shafts are bigger then a 9". Only reason I bring
> it up is a good friend of mine runs a 650 rwhp toyota truck... is turboed
> and is a 5 speed so he shocks the tires like mad launching... he recently
> bent the case on his at Joliet, but amazingly the stock thrid member and
> axles shafts were still mint.
>
> Mikey
>
> >From: "Clint Hooper" <[EMAIL PROTECTED]>
> >Reply-To: The Chevelle Mailing List <[EMAIL PROTECTED]>
> >To: "The Chevelle Mailing List" <[EMAIL PROTECTED]>
> >Subject: Re: [Chevelle-list] 12 bolt advice
> >Date: Sun, 28 Sep 2003 21:36:40 -0500
> >
> >On an engine making 500rwhp,5-7% would work out to be around 25-35hp. I
> >really find that hard to believe and would have to see the different rear
> >ends dynoed back-to-back to believe a claim like that. Even if it was
> >true,the weight difference of a Dana 60 would cancel everything out.
Those
> >things weigh a ton unless fitted with a mag 3rd member and chromoly
axles.
> >Clint Hooper
> >H&H Custom,owner
> >LT5 Registry Director
> >http://www.LT5Registry.net/
> >ACES #1650
> >http://dalesplace.com/misc/friends/clint_hooper.htm
> >----- Original Message -----
> >
>
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