As above really, the IB5 box i'm going to be fitting has quite a short final drive (similair to an XR3i) and so will be high up in the revs at motorway speeds.
I was wondering if it's possible to fit a longer 5th gear retaining the final drive for 1st-4th acceleration? Or would this not work as there would be less teeth and so not engage properly?

Oh and if anyone knows where I can buy a BC/IB5 5th gear puller that would be very handy as I cant find one for shit!! lol

Cheers!

 

Yes it sure is mate, guy whos going to be building my box has messed around with several final drives to drives to bring the revs down on the motorway.Will find out what they are, iirc the last one he did was a 3.5 final drive which bought the revs down to around 2.5k at 80mph

 

I know you can change the final drive mate, but it's 5th gear itself that I wondered if you can change?
I'd like to keep the FD as 1st through to 4th gives nice quick acceleration but a longer 5th would be nice for motorway cruising etc..

 

Fairly sure it's possible, try a Ka 5th gear - that's really long. Mate of mine had a Ka turbo conversion he did himself, rebuilt his IB5 with ST150 gears 1 -4 and left the Ka's 5th gear in because it was so long, so he had loads of accelleration and a cruising gear.

 

Cheers mate but IIRC it isnt the 5th gear thats long it's the final drive on the lower model Ka's, might be wrong though, i'll check!

Cheers!

 

[QUOTE=
Oh and if anyone knows where I can buy a BC/IB5 5th gear puller that would be very handy as I cant find one for shit!! lol

Cheers![/QUOTE]

ill have one as well if you can find one cos ive looked alover as well, the gearbox man i was using keeps wanting me to bung him everytime i use his tool its no good. and he wont tell me were he got it!

 

i use a xr box lovely at acceleraying but crap on motorway im doin neary 5/6 k doin about 80 ! inless there is something else up

 

i had mine off ebay Ł25 same as tho looking for ages till i found one put a bid in and got it thought it was going to go for big money but it didnt

 

No probs mate!
Yeah thats why I want to keep the FD and 1st-4th just want a longer 5th if possible!
There are a few on the American ebay but they either want stupid money or wont fucking send to the UK

 

You can buy a 5th gear removing tool from here http://www.spxtools-shop.com/jlr/pro...nfo=p1149.html

But it isnt cheap! Ł70 plus postage

 

There is a 0.76 5th gear ( same ratio as RS Turbo 5th ) available for the IB5, I have a pair here for a custmer, try a 1400 Fiesta

 

I thats the one, ouch ill have to save some pennys for that one. thanks for finding it karlos

 

It has a 0.76 5th gear, I need a longer one! lol
The final drive is 4.25 which is great for acceleration 1st-4th but 5th needs to be longer for better economy on the motor way, or at least I would like it to be!
No probs, it took me fucking ages!

 

Not really helpful, but I've always found that a long final drive have given the best acceleration on a turbo car with good powerband.
As an extreme example. The best 0-100km/h times were achieved with using second gear only. When power is everywhere, shifting just loses time.
I've had all the ratios, started from 3.84 then to 4.27 and now happiest at 3.54.

 

http://www.fiestaturbo.com/forums/si...tion-vt183698/

 

I to have used all of those final drives and much prefer 4.27 for normal driving, it's just at cruise you are high up in the revs, 3.52 is a joke for road use I could do 20-110mph in 3rd gear when I was using that FD might as well have been an automatic! lol
It says in that thread that the diesel 5th is 0.76 which is the same as what I already have mate

 

well when my s1 is built ive got 3 mk3 xr3i gearbox'es to keep me on the road when my s1 box shits itself so will turn my car into the one wheel warrior lol

 

Ahh OK in that case you're stuck, 0.76 is the highest ratio 5th there is. You'd need to drop the final drive a touch to get what you want.

 

Classic!
Yeah I love my close FD too much, thats not going anywhere! lol
Not really a problem, just would have been nice to have a better 'overdrive' thats all

 

have a look on turbosport in the rs turbo section there is a sticky about rebuilding rs gearbox's where different gears are used, i think someone used escort ka puma and focus gears in one to get a proper sorted box

 

[quote=Karlos G;4935600]Classic!

yep should be great fun lol lets see if i can get the max 28psi from my stage3 t3....

and my mate ian ball is mapping my car in his spare time so should be good as hes a bit of a boost junkie lol

 

you could always lower your fd to the 4.06 one and then use the ratio's out of the 1.4 cvh motors that have shorter gears 1-4 and put your .76 5th in that should get you what you want quick 1-4 and a slightly longer 5th for motorway

 

Yeah thats a good idea, but to be honest I cant be arsed scrapping around finding and stripping box's, if I could have just bought a 5th gear from somewhere and fitted it whilst I was fitting the LSD then I would of, not a biggy really!
Cheers!

 

My S1 at 60 mph shows about 2k rpm nice and relaxed on the motorway

PaulT

 

Then you dont have a genuine S1 box or your tacho is well out!

 

Never said it was a genuine box tacho may be out but hey ho who cares

 

Then why did you tell me?? lol

 

i like that graph it clearly states that if i get my car to rev to 12,000rpm it will do 200mph in 4th, im off to the engine balancer lol!

 

......... lol

 

 

lol!
as said the series one box/gearset will not do 2k @60mph.
i have one and sits at 3.5k@ 70mph ish.
if this ever gets resolved then i'd like to know as fifth gear runs out of puff so easily.

 

Where web address did you get your calculator from karl?

 

I'll email it to you Geoff!
It was from the CTS website I think.

 

Does anybody know if these gearbox ratios are corret for a mk5 esort (cvh) 1.4 LX


1st 3.58,
2nd 2.04,
3rd 1.32,
4th 0.95,
5th 0.76

Final drive 3.82

 

nearly 3rd 1.35
f/d 3.84