Tremec T-56 in a 6.0ltr facelift XJ-S Coupe
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Actually, part of the beauty of the Richmond 6-speed is that it's NOT a double overdrive transmission. 5th gear is 1:1, and mine is geared so that 6th is 0.86:1
From a performance standpoint, I just don't see any reason to have overdrive in both 5th and 6th, like the Tremecs have. Double overdrive is a feature aimed at fuel economy, and face it...if anyone bought, or modified their V-12 powered XJS for fuel economy purposes, they need to go sit in a corner till they get their mind right
From a performance standpoint, I just don't see any reason to have overdrive in both 5th and 6th, like the Tremecs have. Double overdrive is a feature aimed at fuel economy, and face it...if anyone bought, or modified their V-12 powered XJS for fuel economy purposes, they need to go sit in a corner till they get their mind right
LOL, this made me laugh.
IMO the only reason you would use a double O would be if you had a 4:1 or lower (numerically higher) ring and pinion. which is exactly why theyre using them in modern 4 bangers and big V8 cars.
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That's just my opinion though.
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Mguar (06-21-2023)
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I've put together a spreadsheet with the relevant information showing engine speeds with the various ratios etc etc. is there anyone who'd have a look at this spreadsheet if I email it? A) to confirm my formulas/calculations are correct & B) to try & help me understand the effects the different ratios/combinations will have on acceleration.
I'd like the engine to be turning less revs at 80mph than it is currently but I'm also looking to improve the acceleration through the gears - I guess I'm wanting the best of both worlds really.
Thanks
Mike.
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I've put together a spreadsheet with the relevant information showing engine speeds with the various ratios etc etc. is there anyone who'd have a look at this spreadsheet if I email it? A) to confirm my formulas/calculations are correct & B) to try & help me understand the effects the different ratios/combinations will have on acceleration.
Check your private messages. I have an Excel spreadsheet you will want to see and play with.
#46
Here are a couple of T5 sites I found helpful.
COOL CATS » Celebrating the 1983-88 Mercury Cougar » Modifying : Ford Borg-Warner T-5 Manual Transmission Data
TTC: TREMEC Transmissions
COOL CATS » Celebrating the 1983-88 Mercury Cougar » Modifying : Ford Borg-Warner T-5 Manual Transmission Data
TTC: TREMEC Transmissions
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the best way to go is going to be the bell from www.5speeds.com and a ford t5 from a 5.0 or a cobra which are about 1000 rebuilt which is what i am running, and i spinn the 275s without any problem and the trans is still there
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Jagzilla,can you reveal some of the details of what you used to get that trans behind the 12? I'm trying to get some kind of 6 spd behind a 6.0L. The new t56 can be had with 2.97 1st and the two top gears can be easily changed out for .80 and .68. The main concern for me is the shifter on the R.O.D being so bulky. How did it work out for you?
Last edited by Jagman99R; 05-07-2013 at 01:44 PM. Reason: directing comment to member
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Jagman99R (05-08-2013)
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I have a ZF 6 speed originally fitted to the ZR1 Corvette, with custom made V12 alloy bell housing and paddle clutch/AP racing semi organic clutch that would fit nicely.
You just need the XJS manual pedal box assembly, alter the prop length and talk money to me
It was originally bought to convert a Lynx Eventer into the ultimate 'station wagon' with 7lt TWR Engine, 200mph was projected...Still got lots of stuff left as it didn't get off the ground...
You just need the XJS manual pedal box assembly, alter the prop length and talk money to me
It was originally bought to convert a Lynx Eventer into the ultimate 'station wagon' with 7lt TWR Engine, 200mph was projected...Still got lots of stuff left as it didn't get off the ground...
Intriguing thread. Might just be my project now..... still not finished ;-)
Can you come back to me on this one? Any info is welcome!
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