Avoneer
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| posted on 20/10/04 at 09:36 PM |
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Best Diff for Blade, R1 or Firestorm
Hi Guys,
I know this has been covered a million times, but someone please just point me in a good direction.
As I plan to build an ST Phoenix with either a Blade, R1 or a V2 Firestorm next year.
I have been collecting bits and now have a 3.92 diff, a 3.62 LSD and possibly a 3.38.
Which will be a best all-rounder for track and long distance runs?
I'm thinking 3.62 LSD.............
Cheers,
Pat...
[Edited on 20/10/04 by Avoneer]
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JoelP
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| posted on 20/10/04 at 09:57 PM |
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i would agree, though obviously i have no personal experience. I suspect the 3.9 would top out on straights, and the 3.38 might be too long. Unless
there were very fast straights. Seeing as the 3.6 is the cheap LSD one, you are best starting here. If you end up on a track popping it off the
limiter, you will know we were wrong!
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Avoneer
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| posted on 20/10/04 at 10:02 PM |
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Cheers Joel, how's the car coming on?
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Hellfire
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| posted on 20/10/04 at 10:03 PM |
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We have a 3.62 LSD on our's - it tops out at around 114-118 allegedly....
We get 0-60 just above 4secs (not confirmed) it seems about right for our purpose.
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Avoneer
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| posted on 20/10/04 at 10:05 PM |
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Oh yeah,
Will be using 13" wheels with 60 series tyres on (unless I can't get them over my rear calipers).
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alister667
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| posted on 20/10/04 at 10:33 PM |
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Mine (blade) is on a 3.62 open diff on tall 15" wheels, and I'm very happy with it. My friend Brian (also blade) runs 3.54 on 13"
wheels and reckons his is a little to low geared for the road and if he could easily get a higher geared english axel he would go for it.
My car (using speedcalc.xls) tops out allegedly at 130 or so, so cruising at 60-70 is fine and not too strained.
http://members.lycos.co.uk/alister667/
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JoelP
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| posted on 21/10/04 at 07:30 AM |
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quote:
Originally posted by Avoneer
Cheers Joel, how's the car coming on?
slow... i need to retire to get it finished!
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phelpsa
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| posted on 21/10/04 at 08:29 AM |
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quote:
Originally posted by Avoneer
Oh yeah,
Will be using 13" wheels with 60 series tyres on (unless I can't get them over my rear calipers).
Only 13" split rims will fit over the rear sierra calipers, as the rim is thinner.
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scotlad
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| posted on 21/10/04 at 10:37 AM |
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i can confirm my blade indy tops out at around 120 mph at 11750rpm on 15' wheels with 60 series tyres and 3.62 lsd. its about 5 mph slower on my
slick 60 series 14s. no change in 1/4 mile time on either wheel due to need for extra gearchange with the 14's would recommend lsd just for
the fun factor- does fabulous donuts!!!!!
[Edited on 21/10/04 by scotlad]
[Edited on 21/10/04 by scotlad]
[Edited on 21/10/04 by scotlad]
[Edited on 21/10/04 by scotlad]
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Crazy Jay
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| posted on 21/10/04 at 12:10 PM |
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Can any1 tell me wat an r1 or blade indy can do a 1/4 mile in? Just always wanted to know
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scotlad
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| posted on 21/10/04 at 12:13 PM |
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13.4 at last try, but clutch was on its last legs and slipping- new clutch fitted and hoping for 13secs- or less next time with a carb blade engine-
injected blade engine goin in over the winter
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Crazy Jay
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| posted on 21/10/04 at 12:20 PM |
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Holy shit! That'll beat a ferrari 360!! and all for a 20th of the price
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scotlad
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| posted on 21/10/04 at 12:24 PM |
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of course- what did u expect???? got whupped by a souped up sunny gti-r off the line only coz he had 4 wheel drive! gettin it off the line is
tricky- difficult balance between bogging down and wheelspin.
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jimgiblett
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| posted on 21/10/04 at 05:24 PM |
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Hi Pat,
R1 with 205-60-13 and a 3.38 will give you top speed of around 135mph.
The same with Blade engine will be about 10 mph slower.
Aerodynamics becomes quite an issue over 120mph.
I'm Running an R1 with 195-55-14 and 3.38 LSD and top out at approx 135 when I hit the limiter  You can get 3.18 diffs but the 2000-> R1
has quite a long 1st gear and felt it might be too much. Ideal solution would be a 98/99 1st gear and a 3.18 then who knows how fast it will go.
You can make a 3.38 LSD by putting the viscous unit out of the 3.62 LSD together with output shafts. That's what I had done by the nice guys at
Road and Race.
Cheers
Jim
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Avoneer
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| posted on 21/10/04 at 06:26 PM |
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Hi Jim,
Do you need any other bits to convert the diff or just the 3.62 and loads of money?
Think I will start with the 3.62 and 14"s and see what happens!
Not bothered about going over 120mph anyway!
Cheers,
Pat...
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jimgiblett
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| posted on 22/10/04 at 10:40 AM |
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Hi Pat,
Just take a 3.38 and a 3.62 down to Road and Race give them approx £80-£100 and come away with a 3.38 LSD. Road and Race are in Kent so may be a
little way from you.
"Not bothered about going over 120mph anyway" 
You will when you get on track
It's not just for the top speed but also to drop the revs in top when on the motorway. eg 5,900rpm and 6,300rpm at 70mph.
Save you fuel too !
Cheers
Jim
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