MA Gearbox Ratios

[mischief]

vtr box all the way then lol

[Lippy]

Originally Posted by Mr_P

AFAIK the final drives are easily changed from box to box.

but does the dinal drive effect all of the gears??? I wanted to know if you could just change the 5th gear if anyone can answer that one?

Cheers for the reply Mr_P thought as thats interesting that it can be changed easy enough... might be able to just fit a new xsi final drive to my vts box???

[raunchz]

Originally Posted by Lippy

but does the dinal drive effect all of the gears??? I wanted to know if you could just change the 5th gear if anyone can answer that one?

Cheers for the reply Mr_P thought as thats interesting that it can be changed easy enough... might be able to just fit a new xsi final drive to my vts box???

yes

you can change 5th, but need the matching pinion shaft end gear (this needs to match the end length of the input shaft)

can fit a xsi final drive to vts box - need to swap the pinion shaft and diff over.

I've just fitted a 0.767 5th to an S1 box, but had to change the input shaft too so box apart job.

[Lippy]

Originally Posted by raunchz

yes

you can change 5th, but need the matching pinion shaft end gear (this needs to match the end length of the input shaft)

can fit a xsi final drive to vts box - need to swap the pinion shaft and diff over.

I've just fitted a 0.767 5th to an S1 box, but had to change the input shaft too so box apart job.

Ah so it can be done that you use s1 box for acceleration but a larger 5th gear for economy and motorway driving!?!

what does the .767 give in 5th gear? top speed and revs wise? Id be happy if 5 th was completely gutless but quiet and low revving tbh!

[geoffgti88]

Originally Posted by raunchz

good luck with it - you'll be after a diesel box then ? IJOKE !!!!!!!!!!!!!!!!!!!!!!

The deisel box is no stronger than any other MA box.

[raunchz]

Originally Posted by Lippy

Ah so it can be done that you use s1 box for acceleration but a larger 5th gear for economy and motorway driving!?!

what does the .767 give in 5th gear? top speed and revs wise? Id be happy if 5 th was completely gutless but quiet and low revving tbh!

I'll work it out when I get a sec, its 10% different to the oem 5th. I'll be selling my s1 box when I get home but want to run it on my car to check it's all okay first (as I've fitted new synchro's and uprated input shaft bearings)

Basically the gearbox is just like a bike. The front gears are like the FD (although larger fd = rev quicker but with less top speed) and the rear gears are just like the normal car gears.

So you can see that by changine the front gears (fd) you completely change the rpm for each speed and how quick you accelerate and your top speed

[Toad]

Originally Posted by RAFkev

What do you mean by your last sentence? No different?

Surely if (for example, so dont quote me) a standard vts box will do 60mph on the limiter in 2nd, an S1 box on the same engine would do a few mph less? But would get there a little quicker?

Forget about speed and think about RPM.

Let's say you have a VTS box and an S1 Rallye box. Same ratios, but the S1 box has a much higher final drive. Drive to 7000rpm in 3rd gear on both boxes, and then shit into 4th. The RPM will drop by the exact same amount as the ratios are identical.

I higher final drive does still have a useful advantage, even if it's got the same ratios. When tuning an N/A set up to likes of 160bhp / 190bhp, the engine will not be overly peaky, but it will have a greater tendancy to bog down in low RPM areas. The higher final drive will make it easier / quicker to get into the power band if you find yourself in too low of an RPM. But it will also go through the power band quicker too...

Taking a peaky engine as an example, which produces its power between 7000 and 8500rpm. What use is a gearbox which when shifted at 8500rpm, it falls all the way back to 6000rpm? This is where a closer ratio box would be required. It's worth noting that the higher RPM achieved before shiting, the greater the rev drop will be.

[CbVtR]

sorry to jump in on a thread guys, I have read all the posts but I have a question, I do alot of motorway miles but I'm after a bit more get up and go from my vtr, am I better off with a vts box or a lightened flywheel or my vtr box,

[Toad]

You can't have your cake and eat it I'm afraid.

If you do a lot of miles, stick with the VTR box.

[CbVtR]

yeah I thought as much, but would a light flywheel make a difference on a vtr box accel wise?

[Toad]

It's one of the latter tuning areas to look at. So no, it won't make much of a difference.

[piranhamatt]

wait so my furio can do 141mph...? faster than the vtr and s?

[Oc2]

Originally Posted by piranhamatt

wait so my furio can do 141mph...? faster than the vtr and s?

No... the 1.4 box is good for 141mph, not the engine mate

[boz]

so what would a vts, running 16s with 195/40/16 and a vtr box and raised rev limit, get top speed?

bhp not count towards the figures??

[Steve]

Originally Posted by boz

so what would a vts, running 16s with 195/40/16 and a vtr box and raised rev limit, get top speed?

bhp not count towards the figures??

i have joes spreadsheet on my old PC al dig it out for you

[lukesaxo]

i have a standard vtr and got 126 mph out of it would a vts box make a higher top speed forgive if iam talking crap lol

[raunchz]

I wouldn't imagine so

[stuartm]

I have what i thought to be a completely standard vts, but looking at the charts on the first page it seems i have a vtr box on it, as at 7200rpm it's showing 70mph on the speedo. Even stranger it will keep on going to 7800rpm & it's almost doing 80mph. 80mph in 5th it's doing 3600rpm, it does accelerate well(some said it would be slow as feck) on a known bit of road to me my previous rx8 would hit 100 by the roadsign & the vts does 95.
Are both the dials out(seems right with missus car & other traffic)?
If not why would it rev round that far, the car looks standard, no exhaust, filters etc.
p.s. & im getting between 42-45mpg
I feel like im telling porkies but it all is true, anyone get rid of my doubts(no sticker on the box, so i can't check the code)

[RAFkev]

As you can see by my sig below I have a few things done to the car.

I can only just hit 60 in second at around 7500rpm(ish). I have standard box and standard 15" vts alloys.

[KieranYeh]

I knew i could hit 160..

SEE THAT EvERYONE furio: 160
VTS: 141

That MUST mean furios are far quicker than vts's at red line 5th when they are drag immune.