Be4 Gear Ratios For 205 Tu3S Rally Car

[NEMCA 2]

Hi,

 

Can anyone advise a good gear ratio set up for a BE4 gearbox in 205 TU3s rally car. I've recently converted to a BE4 gearbox from a picasso. However, it is still standard ratios and I wish to make some changes as I now have the time.

 

Any info would be greatly appreciated

 

Neil

[dcc 855]

Find yourself a be4 cwp with a higher ratio, such as a 4.2, 4.42, 4.5, 4.7, 4.93...

 

I have found a few 4.93's & 4.7's in the past and a few 4.5's.

 

I think most gearsets are very similar in ratios

[welshpug 1,621]

*Lower ratio Dan, LOWER.

 

 

 

Which gearbox do you have Neil? there's a code on the front of the middle casing.

[NEMCA 2]

Hi Welshpug, ref. code - do you mean around the clutch fork area? I may have to get the sump guard of to check that!

 

Obviously the lower the CWP ratio the better for my needs but having had it out on Sat/Sun for the first event I find it is holding onto the gears for too long (2nd/3rd). I would like to get up the gears quicker and lose less revs in between.

 

I have been told the 206gti180 gears are a good place to start, can anyone confirm this?

[welshpug 1,621]

the gearset would be good but not the Final drive, 138 gti gearset is the same but a longer final drive again.

[NEMCA 2]

1st gear looks longer/different in the 180 (does that make sense).

 

Ok, so maybe a 206gti/180 gear set with as low a CWP as I can find?

 

Cheers

[dcc 855]

Iirc you can even fit be3 gearset and cwp, just use the be4 casing

[NEMCA 2]

Ok, first i'll try find out which BE4 gearbox I have and what the ratios currently are and then go from that. I'll get the code of the box laterthis week.

 

Thanks for your help so far

 

Neil

[And 15 1 Cars]

Gti180 has the 2.99 first gear the gti 130 has the 3.4 first (worse than the ma) I ran with full be4, gti180 gear set on a 4.9 there is also a 5.1 and they don't cost the earth genuine, (be4 stuff is the only stuff available from pug) I have just changed tho keeping the gti180 first and second plus input shaft and then gti6 3-5th and a be3 5.1 final drive it's so much better (so a mix of be3&4) some don't like the gti6 gears saying they are week but still easy to get and very close to the qualife set. If I do get repeated failures tho I will just switch to the qualife gear set.

Edited July 4, 2016 by And

[NEMCA 2]

Ok, cheers for that info - I could possibly have access to a GTI6 box shortly.

 

Out of curiosity, what spec engine are you running?

[And 15 1 Cars]

A tu3 still 1360 alloy block, putting about 130bhp at the fly, heavily modfiyed head, grp A Pistons, longer steel rods, tu5 late head, Kent pt02 (285 deg) cam soon to be changed for a pt03 as every one is going 16v, and feed through twin 40s,

 

To get the gti6 3-4 gear on the be3 shaft altho they are the same spilne the gti6 has a double spline as be4 so requires one of slides ground out spooks did it for me free as I got the final drive from them but the stock the 3-5 gears as sets to sell ready to fit in be3 5speed boxes. I just did it over winter and the 2 events I have done this year it's so much better hens why I am going wilder cam as had it in a few year ago and I couldn't drive it but think it will work now.

[NEMCA 2]

Lol, Sounds like a well sorted set up. Is that a silver top tu5 head? What ignition system are you running it on? Did you have any piston/valve clearance issues?

I fitted a Newman 290 cam and the valves were touching the pistons - had to pocket them!

[And 15 1 Cars]

Yeah sliver top but fitted with black top cam and followers, think it's the best head they did that's still readily available and has the bigger valves, it's on a modified dizzy from H&H really needs bodies and ecu tho next car maybe, only issues I had was the piston hitting the head so combustion chambers are completly altered but Pistons have a valve cut out that are fine for the 285 deg cam time in at 106-108 deg will find out with the 310deg one soon not much more lift just duration with it need more top end the gti6 5th and 5.1fd is 105mph @7500rpm

[NEMCA 2]

Hi Welshpug,

 

Its a 20 DL 67 BE4 which I have. Is that the correct code you were asking for?

[welshpug 1,621]

yes, that will help massively, might not be able to check servicebox as im in france till Monday evening