What rear diff ratio?

db · Post by db » Thu Mar 12, 15 10:59 am

Colwyn Bay to Santa Pod, 180 miles.
4.55's
No sound deadening.
Fibreglass hood.
Thrush mufflers with side exits.
Windows open.

Bliss

Les Szabo · Post by **Les Szabo** » Thu Mar 12, 15 11:08 am

Remember it well myself Paul, 4.30's with 26" tall tyres, 4000rpm at 55.mph, I wouldn't quite call it bliss, and that was only about 25miles!, only did it the once!!!!......2 B fair, you do have 31" tall tyres, makes all the difference, and on that note....are you driving it to the NATS?

Les

Dave-R · Post by **Dave-R** » Thu Mar 12, 15 12:23 pm

MilesnMiles wrote:Dave 3.91 gears -Cornwall to Santa Pod =290 miles@ 3,700+
Chris Evans pleeze

SPR to Newcastle. 250 miles. 4000rpm (90mph) or as much as I could get away with late on a Sunday evening.

Or York. 90 miles @ 95mph.

Utter bliss.

db · Post by db » Thu Mar 12, 15 1:19 pm

Les Szabo wrote:Remember it well myself Paul, 4.30's with 26" tall tyres, 4000rpm at 55.mph, I wouldn't quite call it bliss, and that was only about 25miles!, only did it the once!!!!......2 B fair, you do have 31" tall tyres, makes all the difference, and on that note....are you driving it to the NATS?

Les

Yeah, them tall tyres made it a lot more bearable.
I'm definitely driving to the Nats mate, the big question is... am I driving it home again after

Dave-R · Post by **Dave-R** » Thu Mar 12, 15 1:26 pm

db wrote:
I'm definitely driving to the Nats mate, the big question is... am I driving it home again after

Shame I will not be there to see it this year. Hope that clutch holds out for ya.

db · Post by db » Thu Mar 12, 15 1:36 pm

Thanks!
I'm wrestling with clutch choice at the moment.
£350 will get me the same dual friction Ade's using, Trusting my old flywheel to not explode...
Or £600 ish for a twin plate with new flywheel...

Les Szabo · Post by **Les Szabo** » Thu Mar 12, 15 3:25 pm

db wrote:
Les Szabo wrote:Remember it well myself Paul, 4.30's with 26" tall tyres, 4000rpm at 55.mph, I wouldn't quite call it bliss, and that was only about 25miles!, only did it the once!!!!......2 B fair, you do have 31" tall tyres, makes all the difference, and on that note....are you driving it to the NATS?

Les
Yeah, them tall tyres made it a lot more bearable.
I'm definitely driving to the Nats mate, the big question is... am I driving it home again after

Yes mate you ARE driving it home this time!!.....pay the money Paul, (easy to say), but get the whole lot, do the job once, and I'll see you there on Saturday blasting up the track

...just take it easy first off till you get the hang on the bite and hook of the car and whats required to stop it bogging., walk before you run!. And go through everything before you run it, valve lash, new plugs? gap, timing etc. etc.

Les

drewcrane · Post by **drewcrane** » Thu Mar 12, 15 6:15 pm

Since changing the rear is not really a long job, it can be done fairly fast with the right tools,( I did it in Kayente Arizona) how about changing gears at the track

.

I have a set of 3:55,s for the track, but I cruise with 3:23,s ,most of the time,kills the low end torque of a 440 but the top end..............

Les Szabo · Post by **Les Szabo** » Thu Mar 12, 15 6:25 pm

When I was racing in Street class 2 brothers with a roadrunner would do the same, drive there and change their diff to 4.10's before racing, not for everyone though!

Cannonball · Post by **Cannonball** » Thu Mar 12, 15 7:09 pm

Les Szabo wrote:When I was racing in Street class 2 brothers with a roadrunner would do the same, drive there and change their diff to 4.10's before racing, not for everyone though!

I used to do it with my charger 440-6 3.23 gears street tires 130 mile drive to pod race it the saturday as is 13,1,s all day swap diff at midnite or thereabouts to a 4,10 and slix and run 13.0s sunday not much diff there guys then swap the 3,23,s back in to drive home,,,

Les Szabo · Post by **Les Szabo** » Thu Mar 12, 15 7:27 pm

would've thought gears/slicks worth .5 at least???????

GJUK · Post by **GJUK** » Thu Mar 12, 15 8:40 pm

Cannonball wrote:
Les Szabo wrote:When I was racing in Street class 2 brothers with a roadrunner would do the same, drive there and change their diff to 4.10's before racing, not for everyone though!
I used to do it with my charger 440-6 3.23 gears street tires 130 mile drive to pod race it the saturday as is 13,1,s all day swap diff at midnite or thereabouts to a 4,10 and slix and run 13.0s sunday not much diff there guys then swap the 3,23,s back in to drive home,,,

hardcore!

Mick · Post by **Mick** » Thu Mar 12, 15 9:29 pm

Cannonball wrote:
Les Szabo wrote:When I was racing in Street class 2 brothers with a roadrunner would do the same, drive there and change their diff to 4.10's before racing, not for everyone though!
I used to do it with my charger 440-6 3.23 gears street tires 130 mile drive to pod race it the saturday as is 13,1,s all day swap diff at midnite or thereabouts to a 4,10 and slix and run 13.0s sunday not much diff there guys then swap the 3,23,s back in to drive home,,,

Yeah but that's when you were young Duncan.

db · Post by db » Thu Mar 12, 15 10:57 pm

Les Szabo wrote:
db wrote:
Les Szabo wrote:Remember it well myself Paul, 4.30's with 26" tall tyres, 4000rpm at 55.mph, I wouldn't quite call it bliss, and that was only about 25miles!, only did it the once!!!!......2 B fair, you do have 31" tall tyres, makes all the difference, and on that note....are you driving it to the NATS?

Les
Yeah, them tall tyres made it a lot more bearable.
I'm definitely driving to the Nats mate, the big question is... am I driving it home again after
Yes mate you ARE driving it home this time!!.....pay the money Paul, (easy to say), but get the whole lot, do the job once, and I'll see you there on Saturday blasting up the track ...just take it easy first off till you get the hang on the bite and hook of the car and whats required to stop it bogging., walk before you run!. And go through everything before you run it, valve lash, new plugs? gap, timing etc. etc.

Les

You bet

I know I should get the proper setup, I just need to psyche myself up to blowing such a big chunk of cash!
Sorry about the huge thread hijack by the way

sinny · Post by **sinny** » Tue Mar 24, 15 9:58 am

I've just switched from 3.91 to 3.23 as mine will be on the street & 3,600rpm+ at 65mph becomes tiring very quickly!