26 replies to this topic

[MEAGY]

Well finally got it up & running after a few problems but what can i say but....wow! I never thought it would make as much a difference as it has, im up into fifth before im usually in fourth it seems like. i couldnt comment on the mph as my speedo is fooked but it definateely accelerates noticably quicker. The only thing is now i think i need a 6th gear, it tops out out far to quickly lol...be nice to see what what speed im actually doing at what revs so the next job is to find out why the speedo has stopped working! oh yeh...& the LSD also works very well

[speedster]

You and vocky will have to have a shoot-out! Whose gonna be the first with paddles?

[cheeky_chops]

Whose gonna be the first with paddles?

Like the VAG DSG?? Do vauxhall do one? That would be cool but heavy imo

[speedster]

Yup, something similar.

Here's a bloke doing electronics for a steptronic conversion
CLICKY

[MEAGY]

You and vocky will have to have a shoot-out!

Whose gonna be the first with paddles?

i kind of wished i`d listened to him with keeping the 6speed now as i cant help but think im going to top it out on the straight on some tracks!

This is also a good opportunity to thank vocky for all the advice he`s given me via pm over the last few weeks, top guy & a fountain of knowledge

[MEAGY]

You and vocky will have to have a shoot-out!

Whose gonna be the first with paddles?

i kind of wished i`d listened to him with keeping the 6speed now as i cant help but think im going to top it out on the straight on some tracks!

This is also a good opportunity to thank vocky for all the advice he`s given me via pm over the last few weeks, top guy & a fountain of knowledge

[vocky]

lowering the final drive ratio on the F23 to 4.17 is much cheaper and easier to do compared with fitting the M32 box, but the M32 does have better gearing

[Guy182]

lowering the final drive ratio on the F23 to 4.17 is much cheaper and easier to do compared with fitting the M32 box, but the M32 does have better gearing

on the NA the 4.17fd may be good however on the turbo it makes no difference apart from emaning u change gears more, which inturn means 30-90 times are slower due to an extra gear change..

unfortunately i had to pay to have the final drive swap done to confirm this

[MEAGY]

Seriously? mine feels much faster, lowering the ratio means it get there guicker doesnt it?

[Guy182]

unfortunately not. just means you change gear more, it gets there in the same time.

[tony1]

hi mate glad you finished it,hows the engine have you notice much diffrence it might be the engine that makes it feal faster ,my one felt much smoother and rev'd much better the the zlet engine

[vocky]

the turbo has a lower rev limit, I think 6450rpm so.. std 1 - 37 2 - 65 3 - 98 4 - 136 5 - 167 4.17 1 - 32 2 - 57 3 - 85 4 - 119 5 - 146 I'm sure you're 0 - 85 time will be better with a 4.17 than a 3.63 diff or your 30 - 85 time will be less. does your vxT seem better through the gears, that's what lowering the final drive is all about, acceleration not top speed. wasn't the fastest accelerating car courtenay had on their rolling road a vxT with a 4.17 diff

Edited by vocky, 27 March 2008 - 08:09 AM.

[MEAGY]

Well the gears are definately shorter, wether thats what makes it seem faster its hard to tell! Guy would know as he has one of those timer things dont you? I wouldnt think courteneys would sell it & state 17% better acceleration on their website if it in fact did nothing for the car!? The engine has a different sound to it, a bit deeper then the old one but it revs nice with the balancers removed & with the lightened flywheel. It also has th vxr turbo on it that i never had before so i could be anyone of these thats making it feel faster i guess. I changed so much at once i couldnt dream of pinpointing something out. All guy changed was the FD & put in an LSD so he would have a much better idea if the mods works or not. Everywhere i drive the revs seems higher than it was previously, wether thats good or bad who knows but i know on thing & thats im so glad to get my car back on the road ive missed it like mad over the last month or so!!

[N17VES]

the turbo has a lower rev limit, I think 6450rpm so..

std
1 - 37
2 - 65
3 - 98
4 - 136
5 - 167

4.17
1 - 32
2 - 57
3 - 85
4 - 119
5 - 146

I'm sure you're 0 - 85 time will be better with a 4.17 than a 3.63 diff or your 30 - 85 time will be less.

does your vxT seem better through the gears, that's what lowering the final drive is all about, acceleration not top speed.

wasn't the fastest accelerating car courtenay had on their rolling road a vxT with a 4.17 diff

I don't think its quite as simple as that, it about finding the most efficient gearing power in the car. The turbo in standard form has different gearing to the n/a because of the extra torque the car produces. If the car has a lot of torque (which a stage 4 does), then the car would probably benefit with a diff lower than 3.63. The 4.17 diff might work a whole lot better on a standard turbo.

Courtenays test is done in the same gear - not a fair comparison in my opinion when gear ratios have changed.

[Guy182]

yes the fastest car 40-100 wa with the the final drive

but thats just in fourth gear, its faster as you are at a higher rpm at 40mph and therefore in the peak power/torque range.

the 0-*** speeds are pretty much identical

the in gear speeds are slower due to extra gear changes.

40-100 is quicker in fourth, (i,e if you was exiting a corner at 40) but then with the original 3.63FD youd start in third and change to fourth and have similar time so its basically pointless

see http://www.type116.c...opic.php?t=3090

im sure if you put in 2 cars with the same NA torque curve one with 3.95 and one with 4.17, the NA would benefit from the Final drive swap.


http://vlsicad.ucsd....i/perf_est.html

1st 3.58:1 2nd 2.02:1 3rd 1.35:1 4th 0.97:1 5th 0.79:1
vx2.2 = 3.95
Weight: 2050lb (vxt)
co.ef - 0/38(?)
frontal - 17(?)

[vocky]

just got back from taking my vx to the mot, had to warm it up beforehand of course, all I can say about the lower gearing on a 2.2 is wow still getting used to it, now the kevlar clutch has bedded in, but it was worth every penny

Edited by vocky, 29 March 2008 - 10:10 AM.

[cheeky_chops]

Meagy - did you go for the regal IC in the end? Just wondered if you had measured any temps?

[Lou1s Cyphre]

Dear All I have a dilemma as you may have gathered I have ordered a 4.17 final drive from Courtenays, however based on Guys findings and his honest posts on the subject, if you were in my position would you still go ahead with the changeover? I will be having an LSD installed anyway whilst the gearbox is out and ignoring any financial implications re-stocking charges etc. Your opinions welcome

Edited by Lou1s Cyphre, 30 March 2008 - 07:18 PM.

[Guy182]

lou1s, are you off work this week at all? if its good weather tomorrow i could meet you somewhere and you could drive it and see what you think? how much are you going to have to pay to cancel the item. to be honest.. for road use, the diff isnt really noticeable anyway

Edited by Guy182, 31 March 2008 - 10:19 AM.

[Lou1s Cyphre]

lou1s, are you off work this week at all? if its good weather tomorrow i could meet you somewhere and you could drive it and see what you think?

how much are you going to have to pay to cancel the item.

to be honest.. for road use, the diff isnt really noticeable anyway

Guy thanks for the offer, ufortunetly I am at work this week. I have spoken to Courtenays and Mark is going to look into the cancellation costs, however as it is a special order they might not be able to cancel it anyway.

On the road doesn't the diff stop the inside rear wheel from spinning?

Also could you E-mail me you RLTC settings as it would be interesting to see how they compare to mine.