Close Ratio Gearboxes...
Discussion
...the TVR ones that is. I keep reading about them on the Sagaris, and other S6 powered cars that have them retrofitted. It interests me that they will do 60+ in first and 100 in second, meaning a more "wide torque band friedly" set up.
Anyway, my question is this: Surely this gearbox would fit the characteristics of a 4.5 (mapped would be better still) more than those of the S6??? Does anyone know what the costs are for one?+ fitting if poss??? Surely that would be quite beneficial to a 4.5 Cerb??
Anyway, my question is this: Surely this gearbox would fit the characteristics of a 4.5 (mapped would be better still) more than those of the S6??? Does anyone know what the costs are for one?+ fitting if poss??? Surely that would be quite beneficial to a 4.5 Cerb??
I'm not sure what the costs to retrofit one of these gearboxes are but I can wholeheartedly recommend them! The overtaking ability is simply stunning in second gear but I'm seldom brave enough to knock it down to first to overtake 30-40mph traffic for fear of falling off of the road.
The only downside is that you have to give it a few revs for a fast getaway from standstill otherwise it will bog down.
I'm not sure if it's the CR box or the Red Rose specification that makes this car seem so much faster than my last 4.5.
Richard
The only downside is that you have to give it a few revs for a fast getaway from standstill otherwise it will bog down.
I'm not sure if it's the CR box or the Red Rose specification that makes this car seem so much faster than my last 4.5.
Richard
BCA said:I'm not getting this -- what you described sounds like a wide ratio gearbox to me.
...the TVR ones that is. I keep reading about them on the Sagaris, and other S6 powered cars that have them retrofitted. It interests me that they will do 60+ in first and 100 in second, meaning a more "wide torque band friedly" set up.
carl_w said:
...the TVR ones that is. I keep reading about them on the Sagaris, and other S6 powered cars that have them retrofitted. It interests me that they will do 60+ in first and 100 in second, meaning a more "wide torque band friedly" set up.
I'm not getting this -- what you described sounds like a wide ratio gearbox to me.
Thats why I said "The TVR ones that is" because it seems wrong to my mind too, surely a close ratio box are ones where the ratios are closer and therefore the possible speeds in each gear are lower?? better for accel if theres low torque... so yeah, TVR stylee box is what im on about.
Typically CR gearboxes have higher first and lower fifth or some combination so that first gear is more like second and then subsequent gearchanges only reduce the revs by a little to keep the engine well into the power band. I had a custom one made with straight cut gears for the 520 and I drop only around 1750 to 2000 revs in gear changes. Each gear change means the engine is pretty well on peak torque after the change and this makes for some exciting acceleration.
Getting off the line is like driving off in a normal second. Lots of revs needed.
Getting off the line is like driving off in a normal second. Lots of revs needed.
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