3.9 diff top speed

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Discussion

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
What can one expect from a 3.9 diff ratio over the standing mile at TR.04 cv8 600bhp.

EmmaJ

4,525 posts

145 months

Saturday 18th April 2015
quotequote all
To beat me off the line but I'll wave as I past you once we hit 120+

If previous experience of going up against another 3.9 diff equipped Monaro

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
EmmaJ said:
To beat me off the line but I'll wave as I past you once we hit 120+

If previous experience of going up against another 3.9 diff equipped Monaro
Possibly true emmaj but just wondering what the top speed would be from a 3.9 diff over the mile

V8TFT

335 posts

182 months

Saturday 18th April 2015
quotequote all
3.91 diff, 5th gear, 7000 rpm, theoretical max speed of 185.

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
V8TFT said:
3.91 diff, 5th gear, 7000 rpm, theoretical max speed of 185.
Thats way more than i thought possible.ok will give it a good go on the day.drivinglaugh

V8TFT

335 posts

182 months

Saturday 18th April 2015
quotequote all
That's only if you get to 7000, which I am guessing is your redline. You should be close to that but you will loose 3mph per 100 revs below it.

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
V8TFT said:
That's only if you get to 7000, which I am guessing is your redline. You should be close to that but you will loose 3mph per 100 revs below it.
Rev limiter already set a 6.9k

TheLeatherman

322 posts

164 months

Saturday 18th April 2015
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jameshsv said:
What can one expect from a 3.9 diff ratio over the standing mile at TR.04 cv8 600bhp.
600 bhp at wheels or flywheel???

With an auto (so 0.7 FDR) and 3.9's I did 166+mph at 6200 rpm I think from the look of my log file.

Edited by TheLeatherman on Saturday 18th April 22:03

Xpuffin

9,209 posts

204 months

Saturday 18th April 2015
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V8TFT said:
3.91 diff, 5th gear, 7000 rpm, theoretical max speed of 185.
That doesn't sound right...
Sure that numbers not a 3.46 diff.

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
TheLeatherman said:
600 bhp at wheels or flywheel???
Flywheel

TheLeatherman

322 posts

164 months

Saturday 18th April 2015
quotequote all
600 fwhp = 480 rwhp I guess on a good day. Far more than I had at 350 rwhp in my CV8 last year at TR, so I would have thought you'll pass 180 mph???

I have 585 fwhp (as measured on an engine dyno when we built the motor) in my ute. It runs 10's as driven to the track, when I lived in Oz. The issue I have with it for TR, apart from trying to get it registered, etc in time, is that it has a big stall converter, and so it'll lose a ton of power. I would love to see it get up to near 180 mph though scratchchin

Edited by TheLeatherman on Saturday 18th April 22:22

jameshsv

Original Poster:

5,844 posts

159 months

Saturday 18th April 2015
quotequote all
TheLeatherman said:
600 fwhp = 480 rwhp I guess on a good day. Far more than I had at 350 rwhp in my CV8 last year at TR, so I would have thought you'll pass 180 mph???

I have 585 fwhp (as measured on an engine dyno when we built the motor) in my ute. It runs 10's as driven to the track, when I lived in Oz. The issue I have with it for TR, apart from trying to get it registered, etc in time, is that it has a big stall converter, and so it'll lose a ton of power. I would love to see it get up to near 180 mph though scratchchin

Edited by TheLeatherman on Saturday 18th April 22:22
Would be great if you could bring it to TR leatherman

gsd2000

11,515 posts

182 months

Sunday 19th April 2015
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Xpuffin said:
That doesn't sound right...
Sure that numbers not a 3.46 diff.
MM6 gearbox not an M12 smile

I think its about right using the top speed calculator

7000rpm with an MM6 gearbox and 3.46 diff is around 205mph according to the top speed calculator i have, but that doesnt take into effect weather etc so wont be 100% accurate

jameshsv

Original Poster:

5,844 posts

159 months

Sunday 19th April 2015
quotequote all
gsd2000 said:
MM6 gearbox not an M12 smile

I think its about right using the top speed calculator

7000rpm with an MM6 gearbox and 3.46 diff is around 205mph according to the top speed calculator i have, but that doesnt take into effect weather etc so wont be 100% accurate
So i could get a reasonable result