decat & diff question.
Discussion
I run 245/35/18 rears with a 3.73 diff.
I get exactly 75 mph (Speedo) at 3,000 rpm in 5th. I'm curious to see what other people are seeing at 3,000 rpm in 5th.
I have the TVR Power exhausts and am considering decats plus Power's decat chip.
My question is, does anyone run this combo (Decats + power pipes) or heard this combo? Car is 4.0 RR engine. One minute i'm certain i'm getting them, then the next minute i'm worrying about the car being too loud. Car is only ever used as a toy not for commuting.
I get exactly 75 mph (Speedo) at 3,000 rpm in 5th. I'm curious to see what other people are seeing at 3,000 rpm in 5th.
I have the TVR Power exhausts and am considering decats plus Power's decat chip.
My question is, does anyone run this combo (Decats + power pipes) or heard this combo? Car is 4.0 RR engine. One minute i'm certain i'm getting them, then the next minute i'm worrying about the car being too loud. Car is only ever used as a toy not for commuting.
smithyl23 said:
I run 245/35/18 rears with a 3.73 diff.
I get exactly 75 mph (Speedo) at 3,000 rpm in 5th. I'm curious to see what other people are seeing at 3,000 rpm in 5th.
I have the TVR Power exhausts and am considering decats plus Power's decat chip.
My question is, does anyone run this combo (Decats + power pipes) or heard this combo? Car is 4.0 RR engine. One minute i'm certain i'm getting them, then the next minute i'm worrying about the car being too loud. Car is only ever used as a toy not for commuting.
Sounds like a standard gearbox with a 0.8:1 ratio (actually should give 74mph).I get exactly 75 mph (Speedo) at 3,000 rpm in 5th. I'm curious to see what other people are seeing at 3,000 rpm in 5th.
I have the TVR Power exhausts and am considering decats plus Power's decat chip.
My question is, does anyone run this combo (Decats + power pipes) or heard this combo? Car is 4.0 RR engine. One minute i'm certain i'm getting them, then the next minute i'm worrying about the car being too loud. Car is only ever used as a toy not for commuting.
The speeds will vary from just over 80 mph to less than 72 mph I suspect.
Try this great excel spreadsheet from Graham Varley... click here
It shows all the different combinations of std box, c/r box, 3.46 diff, 3.73 diff, 3.9 diff.
I had a 3.73 diff with a std box, which was a bit quicker than standard Tams.
I now have a c/r box & a 3.9 diff. Which at 3000rpm I'm doing 70mph.
The difference? Well you lose a bit of the top end but how many times will you do 185ish????
But acceleration now is a different league...
This is how they all should have been from the factory.
74mph @ 300rpm looks like a c/r box & 3.73 diff to me
FB
Edited to add hyperlink to grahams website
It shows all the different combinations of std box, c/r box, 3.46 diff, 3.73 diff, 3.9 diff.
I had a 3.73 diff with a std box, which was a bit quicker than standard Tams.
I now have a c/r box & a 3.9 diff. Which at 3000rpm I'm doing 70mph.
The difference? Well you lose a bit of the top end but how many times will you do 185ish????
But acceleration now is a different league...
This is how they all should have been from the factory.
74mph @ 300rpm looks like a c/r box & 3.73 diff to me
FB
Edited to add hyperlink to grahams website
Edited by Fly Boy on Thursday 20th August 18:24
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