Rods sapphire cosworth
19-12-2018 | 10:28 PM
#161
PassionFord Post Troll
Joined: Feb 2014
Posts: 3,120
Likes: 316
From: Scotland
hi mark
dont you think that the shorter gearing will give you the impression that it’s faster as it will arrive at the Rev limiter sooner rather than actually spending time in parts of the Rev range that make its most power? Say it makes a good spike of power and torque at 6k rpm but with short gears it just wants to Rev like an n/a car with no torque? Possibly quicker 1-2nd gear but not once it’s on the move?
19-12-2018 | 10:31 PM
#162
PassionFord Post Troll
Joined: Feb 2014
Posts: 3,120
Likes: 316
From: Scotland
Only reason I’m asking as it reminds me on my mates Impreza ra, it had a 4.44 final drive and it went from 1st to 4th in a rediculously short period of time but in the real world once moving it wasn’t actually as fast as it seemed.
19-12-2018 | 10:44 PM
#163
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
ive just done a gear speed calc
245/40/18 tyres, 8000 rpm
diff , 1st , 2nd , 3rd , 4th , 5th
3.54 , 60 , 91 , 135 , 172 , 210
4.09 , 52 , 79 , 116 , 149 , 182
3.77, 4.09 or 4.55 is available its just a retro fit of an xj40 crown wheel and pinion into the old case, food for thought
245/40/18 tyres, 8000 rpm
diff , 1st , 2nd , 3rd , 4th , 5th
3.54 , 60 , 91 , 135 , 172 , 210
4.09 , 52 , 79 , 116 , 149 , 182
3.77, 4.09 or 4.55 is available its just a retro fit of an xj40 crown wheel and pinion into the old case, food for thought
Last edited by scoooby slayer; 19-12-2018 at 10:48 PM.
19-12-2018 | 10:52 PM
#164
Mark that's correct as we kept blowing diffs in our Monaro at 706bhp and I called rod in for advice and he told me it was a Salsbury power locker 10.5 out of a Daimler limo but there also in a series 1 and 2 v12 Daimler and early v12 xjs any way we fitted one and no now diff issues lol
Last edited by Jay,; 19-12-2018 at 10:53 PM.
20-12-2018 | 01:20 AM
#165
I've found that life I needed.. It's HERE!!
Joined: Aug 2004
Posts: 1,100
Likes: 34
From: midlands
The power lock jag diffs are great one of the strongest out there ,that’s why all the v8 hot rods back in the day used to use them till the 9 inch became popular,very very strong,but be nice to have a couple of crown wheel an pinions to interchange for gearing
20-12-2018 | 02:22 AM
#166
Advanced PassionFord User
Joined: Nov 2014
Posts: 2,439
Likes: 330
From: Hertsfordshire
Some interesting discussions going on.
I see American muscle cars all the time, I have thought about getting one at some point.
One of my mates picked up a 1973 pontiac, interesting car at times when he's not having to work on it. I'm waiting to hear what he will do as he will most likely be deported back to the Uk next year
I see American muscle cars all the time, I have thought about getting one at some point.
One of my mates picked up a 1973 pontiac, interesting car at times when he's not having to work on it. I'm waiting to hear what he will do as he will most likely be deported back to the Uk next year
20-12-2018 | 08:00 AM
#167
PassionFord Post Whore!!
Joined: Jun 2003
Posts: 5,472
Likes: 223
From: Marlow Bucks
hi mark
dont you think that the shorter gearing will give you the impression that it’s faster as it will arrive at the Rev limiter sooner rather than actually spending time in parts of the Rev range that make its most power? Say it makes a good spike of power and torque at 6k rpm but with short gears it just wants to Rev like an n/a car with no torque? Possibly quicker 1-2nd gear but not once it’s on the move?
The scooby was rally car gearing topping out at 120mph so quite a difference and yes scooby to short.
I truefully think Rods would be insane for the road on short gearing.
Mark
20-12-2018 | 09:50 AM
#168
Advanced PassionFord User
Joined: Jul 2003
Posts: 2,051
Likes: 89
From: Sutton
hi mark
dont you think that the shorter gearing will give you the impression that it’s faster as it will arrive at the Rev limiter sooner rather than actually spending time in parts of the Rev range that make its most power? Say it makes a good spike of power and torque at 6k rpm but with short gears it just wants to Rev like an n/a car with no torque? Possibly quicker 1-2nd gear but not once it’s on the move?
then your ready for the next gear hence being faster.
The rev range still stays the same, you don’t lose revs because you have a lower geared diff, you could still rev it to 8/9k or whatever the limiter is....
My saff is on a 4.3 diff and I’ve sent the speedo well off the clock, I do have modded t5 box though with different gears in it
Cheers Paul
20-12-2018 | 12:46 PM
#170
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
If I can get the 245/40/18 tyres on the back with rods diff it's gonna do 135 mph in 3rd at 8k lol
It's gonna need the tallest/widest tyres I can get on to try and get some grip I think
Last edited by scoooby slayer; 20-12-2018 at 12:47 PM.
20-12-2018 | 12:47 PM
#171
10K+ Poster!!
Joined: Mar 2013
Posts: 10,837
Likes: 1,033
From: Guildford
I know the oppliger close ratio box on the 4x4 cossie with 3.9 diffs and 16 inch wheels gives 20mph per 1000 rpm in 5th which would be way too short for Rod's car as it would top out 180mph at the limit but it does mean there is plenty of scope for 200 mph on normal box ratios and shorter diff.
20-12-2018 | 12:57 PM
#172
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
Tyres will make a huge difference aswell
235/40/17 with the 3.54 is 201 mph at 8k revs
245/40/18 with the 3.54 is 210 mph at 8k revs
235/40/17 with the 3.54 is 201 mph at 8k revs
245/40/18 with the 3.54 is 210 mph at 8k revs
Last edited by scoooby slayer; 20-12-2018 at 01:01 PM.
20-12-2018 | 01:01 PM
#173
10K+ Poster!!
Joined: Mar 2013
Posts: 10,837
Likes: 1,033
From: Guildford
That probably sounds bang on. I guess you could have a long top gear and lower for the rest as long as it doesnt drop off the power curve...after all I doubt you will do 200mph runs all that often compared to the rest of the usage?
20-12-2018 | 01:04 PM
#174
Advanced PassionFord User
Joined: Jul 2003
Posts: 2,051
Likes: 89
From: Sutton
There's one on eBay for Ł120 that's a complete whole late diff second hand so condition unknown and only crown wheel and pinion of any use, there is also a complete early Salisbury rear diff available retro fitted with a 4.09 rebuilt with power lock for Ł1050
If I can get the 245/40/18 tyres on the back with rods diff it's gonna do 135 mph in 3rd at 8k lol
It's gonna need the tallest/widest tyres I can get on to try and get some grip I think
If I can get the 245/40/18 tyres on the back with rods diff it's gonna do 135 mph in 3rd at 8k lol
It's gonna need the tallest/widest tyres I can get on to try and get some grip I think
Cheers Paul
20-12-2018 | 01:07 PM
#175
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
There is also a 235/40/18 nankang ar1 or r888s
I will contact the diff builder, as long as it's something they can build if/when I need it then I can wait til I get the car, but if it's a gotta get it while available will buy the 4.09 now ready and shelf it
20-12-2018 | 01:17 PM
#177
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
Take a look at the gearing Carl has posted and you will see how tall it is geared and then look at shorter gearing speeds and that’s at 8k there can be another 500rpm on top.
The scooby was rally car gearing topping out at 120mph so quite a difference and yes scooby to short.
I truefully think Rods would be insane for the road on short gearing.
Mark
It's 224 mph at 8500 rpm
lol
20-12-2018 | 02:27 PM
#179
I've found that life I needed.. It's HERE!!
Joined: Aug 2004
Posts: 1,100
Likes: 34
From: midlands
Tbh if you run a proper slick not nesasary a drag slick you will still get massive grip and you don’t need wide tyres ,look at the vids I posted there on standard rims on one so 7 j wide,I ran Avon slicks on my escort more of a hill climb circuit tyre but work really well.
20-12-2018 | 02:33 PM
#181
Advanced PassionFord User
Joined: Jul 2003
Posts: 2,051
Likes: 89
From: Sutton
I think you would struggle with that width and profile even on a 17 inch rim tbh.
Esp with the trackday style tyres as they come up a lot bigger in the sidewall and width than normal road tyres.
I have 205/45/17’s fitted and there ain’t loads of room left...
could just be a case of trial and error fitting with the perfect offset wheel and trying different tyres widths
Cheers Paul
20-12-2018 | 02:36 PM
#182
Advanced PassionFord User
Joined: Jul 2003
Posts: 2,051
Likes: 89
From: Sutton
Tbh if you run a proper slick not nesasary a drag slick you will still get massive grip and you don’t need wide tyres ,look at the vids I posted there on standard rims on one so 7 j wide,I ran Avon slicks on my escort more of a hill climb circuit tyre but work really well.
The maltese cars run proper drag slicks with the mega soft sidewalls.
Not track slicks
Cheers Paul
20-12-2018 | 02:58 PM
#183
cossie fan (unluckerly)
Joined: Nov 2009
Posts: 9,798
Likes: 434
From: hampshire
I think the car worked well with it’s gearing. I know mark said once while talking too him a 3.9 would liven it up on the road but if you went in it you certainly wouldn’t think wow that’s got the wrong gearing lol. Too me up on the move which in a road car is the only thing you should be worried about it was with no doubt in my mind 1000cc bike fast. I’m interested to see what Carl’s take on it will be as he has had some very fast cars
20-12-2018 | 03:02 PM
#184
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
Hate to say it buddy but I can’t see a 235/40/18 fitting either.
I think you would struggle with that width and profile even on a 17 inch rim tbh.
Esp with the trackday style tyres as they come up a lot bigger in the sidewall and width than normal road tyres.
I have 205/45/17’s fitted and there ain’t loads of room left...
could just be a case of trial and error fitting with the perfect offset wheel and trying different tyres widths
Cheers Paul
The following users liked this post:
STeve (20-12-2018)
20-12-2018 | 05:13 PM
#189
Thread Starter
10K+ Poster!!
iTrader: (4)
Joined: Jun 2006
Posts: 10,211
Likes: 415
From: st neots cambridgeshire
I think the car worked well with it’s gearing. I know mark said once while talking too him a 3.9 would liven it up on the road but if you went in it you certainly wouldn’t think wow that’s got the wrong gearing lol. Too me up on the move which in a road car is the only thing you should be worried about it was with no doubt in my mind 1000cc bike fast. I’m interested to see what Carl’s take on it will be as he has had some very fast cars
I will certainly need some practice, I haven't driven a stick shift in anger for must be 5 years
lol
20-12-2018 | 05:55 PM
#192
PassionFord Post Troll
Joined: May 2004
Posts: 3,386
Likes: 64
Going from a 235 to 245 will only require 5mm if it touches with the 245's on the outside
You need the RIGHT bodyshop thats all
20-12-2018 | 06:27 PM
#194
I've found that life I needed.. It's HERE!!
Joined: Aug 2004
Posts: 1,100
Likes: 34
From: midlands
oh I thought he ment for quarter mile,my bad, then again F1 cars run slicks if it was for top speed run,also a lot of the Maltese do run Avon’s been attending there over 10 years hence me using them but some obviously like a drag slick
20-12-2018 | 06:46 PM
#195
The Salisbury 4HA/U there are loads of ratios spread across 3 different crownwheel carriers. From around a 2.6:1 all the way to a 6:1 😳
Rods diff system was created by Brom as I recall, the jag concept that Brom got was copied off mine when he was working with Sean Bicknell who was looking at mine at my house about 12 years ago.
Rods diff system was created by Brom as I recall, the jag concept that Brom got was copied off mine when he was working with Sean Bicknell who was looking at mine at my house about 12 years ago.
20-12-2018 | 06:50 PM
#196
10K+ Poster!!
Joined: Mar 2013
Posts: 10,837
Likes: 1,033
From: Guildford
A chap I know paid Ł14k to have the McLaren factory bring a set of tyres and full factory support for a 240mph attempt in his Mac F1, he managed 220 but has since maxed it and is the fastest recorded customer on a road (autobahn). Evo mag covered it along with a 200+ run in his Carrera GT
tyres do do some weird things at really high speed.
tyres do do some weird things at really high speed.
20-12-2018 | 06:53 PM
#197
10K+ Poster!!
Joined: Mar 2013
Posts: 10,837
Likes: 1,033
From: Guildford
Carl, will you be happy for us all to continue to call it Rod’s car? Personally I like to think of owners of important cars as the next custodian so to me it is fitting to still call it Rods car...for the history....what are your thoughts.?...it is kind of the same when people refer to the old escos on here by its old plate ending...YUM.
