- Thread starter Lobster
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Eoynteenie
Planning an Advent4
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http://www.renault4.co.uk/gordini-gearbox.htm
Malcolm has been there and done it, Derek at Renospeed F6 has a 5 speed as well.
I think is mainly for the 5th gear to relax on cruising in the modern day, as doing the M3 with my Rene was not fun at playing it safe at 50mph and having the engine screaming when you do push it to the national speed limit.
Malcolm has been there and done it, Derek at Renospeed F6 has a 5 speed as well.
I think is mainly for the 5th gear to relax on cruising in the modern day, as doing the M3 with my Rene was not fun at playing it safe at 50mph and having the engine screaming when you do push it to the national speed limit.
malcolm
& Clementine the Cat
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There are 2 different boxes. Mk1 R5 GTL has a 5 speed box with higher ratios than the R5 TX. On the TX 5th gear is a similar ratio to the 4th gear in the R4 GTL. I'm not sure if the R4 van has lower ratios than the R4 GTL.
I'm using the R5 GTL box in the Gordini. 5th gear is a good for cruising but 3rd is too high for messing around on back roads. Don't think the 1108cc engine would pull the high ratio. Might swap for a TX gearbox. I'm building a TX at the moment so I'll see what that's like first.
I'm using the R5 GTL box in the Gordini. 5th gear is a good for cruising but 3rd is too high for messing around on back roads. Don't think the 1108cc engine would pull the high ratio. Might swap for a TX gearbox. I'm building a TX at the moment so I'll see what that's like first.
Azazello
habitué
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The lower ratios on the van is anyway linked to the lower compression of the engine?
This argument sounds quite interesting to me, cause I think I am going to "enlarge my engine" from 956 to 1108, fitting new pistons and stuff. But my tl engine has a compression of 8,3 while the GTL engine has a compression of 9,5, and my mechanic is not sure we can reach that precise value... so I am wondering what will happen if I end with a 1108 engine with a lower compression than the original GTL...
This argument sounds quite interesting to me, cause I think I am going to "enlarge my engine" from 956 to 1108, fitting new pistons and stuff. But my tl engine has a compression of 8,3 while the GTL engine has a compression of 9,5, and my mechanic is not sure we can reach that precise value... so I am wondering what will happen if I end with a 1108 engine with a lower compression than the original GTL...
Lobster
Enthusiast
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Could be yes. My van has an engine from an R5 anyway (+ R5 carb etc) so it shouldn't be a problem to fit the GTL gearbox in that case?
angel
Enthusiast
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I downloaded a copy of the 354/HA1 gearboxes from the French R4 club forum, which was quite enlightening about gear ratios...
There actually were 3 final drives for the 5-speed box, 3,1:1 (like on 4 GTL), 3,44:1 (R4 956) and 4,125:1 (like on F6). 1st, 2nd, 3rd are exactly the same ratios as on the 4-speed, 4th is slightly lower and 5th is taller than our 4th (overdrive at 0,949:1). This one with a 3,1:1 final drive would make a really long-legged top gear, only suitable for descents with the normal GTL engine. Or perhaps would be suited to a GTL with the Hennessey hot-up kit.
The final drive on the F6s was the lowest available (4,125:1), simply because the van had to haul 400kg of load, and start on steep inclines loaded... So Lobster, you may se impressive difference by simply fitting a 956 gearbox (like Andrea's) with the 3,44:1 final drive. I guess GTL's 3,1:1 final drive may be too tall for the F6s aerodynamics, but then you already have an R5 engine and may prove itself fine...
There actually were 3 final drives for the 5-speed box, 3,1:1 (like on 4 GTL), 3,44:1 (R4 956) and 4,125:1 (like on F6). 1st, 2nd, 3rd are exactly the same ratios as on the 4-speed, 4th is slightly lower and 5th is taller than our 4th (overdrive at 0,949:1). This one with a 3,1:1 final drive would make a really long-legged top gear, only suitable for descents with the normal GTL engine. Or perhaps would be suited to a GTL with the Hennessey hot-up kit.
The final drive on the F6s was the lowest available (4,125:1), simply because the van had to haul 400kg of load, and start on steep inclines loaded... So Lobster, you may se impressive difference by simply fitting a 956 gearbox (like Andrea's) with the 3,44:1 final drive. I guess GTL's 3,1:1 final drive may be too tall for the F6s aerodynamics, but then you already have an R5 engine and may prove itself fine...