What The Most Bhp Known For A Be3 Gearbox

[aarontrophy 26]

Thinking out the box a bit but what bhp will a be3 1.9 box take? Understanding that it will cost a bit to build

 

Cheers guys

 

Hoping 600 bhp but......

[welshpug 1,622]

its torque that kills them not BHP, they were originally rated for low 200's LBFT IIRC.

Edited September 7, 2014 by welshpug

[crossflow 2]

Its the casings that become the weak points. wouldnt go much more than 210 lbft even with a dogbox

[allanallen 528 2 Cars]

My supercharged car (1900 box) has run 200lb happily for 5 years now but the power delivery is gentle on that and I drive it with a bit of sympathy.

A mate is running nearly 300lb through his 1600 box now, the power delivery is vicious and he has little mechanical sympathy, no issues so far.

Edited September 11, 2014 by allanallen

[Tom Fenton 1,525]

Another one running over 200ftlb 1600 turbo, and the power delivery isn't gentle and in many cases neither is the driver.

Al interested to see how Drew gets on with his lasting.

In my mind you are torque limited most of the time by the tyres anyhow!

[allanallen 528 2 Cars]

Correct, once he's got an LSD in it may well be a different story! The kid bloody murders it every where!

 

And yes, you're a rough bastard as well!!!

[dcc 855]

Wasn't there a guy on here with the twin turbo supercharged mi which was circa 900bhp on a be3?

[allanallen 528 2 Cars]

Ha ha ha ha ha

 

I think in it's 1000000bhp incarnation it had a Sherpa box

[RossD 43]

BE4 (And thus probably the BE3) is rated to 250NM by Peugeot Citroen (I'll dig out the link / document when i can find it). There's obviously a bit of a margin there though. 250NM is about 185 lb/ft.

Thats not to say if you put 251NM through it its suddenly going to fail, but i expect reliability and longevity are going to be compromised the more torque you have.

[JeffR 51]

Here you go Ross-

 

 

Allan, I'm guessing yours is a low boost? Sounds like your mate has the Lynx h/b kit. About 400hp & 280ft/lbs torque.

 

Does it make a difference which gearbox casings you use? I've got S16 ones which have more ventilation holes around the bellhousing. Dunno if they're any stronger internally though.

[allanallen 528 2 Cars]

Here you go Ross-

 

 

Allan, I'm guessing yours is a low boost? Sounds like your mate has the Lynx h/b kit. About 400hp & 280ft/lbs torque.

 

Does it make a difference which gearbox casings you use? I've got S16 ones which have more ventilation holes around the bellhousing. Dunno if they're any stronger internally though.

No! Wash your mouth out young man! Mine is a mi16 with an eaton m45 making around 7.5psi, my mates is a gti6 with a t28 making just over 10psi.

 

The lynx kits are a lot kinder on boxes due to the way the power is produced, the torque comes in very gradually and rises very linear with the revs.

Edited September 14, 2014 by allanallen

[adman 5]

slightly of topic i know but we are hoping to use an ml5t box on a t16 engine, but does anyone know of a plated diff available for these?

[Miles 331 1 Cars]

Not at the moment, 3J where thinking about it but the numbers are too low at the moment

[adman 5]

I think Gripper are in talks about developing 1 also if they can get enough interest.

 

Would rather not take this route but has anyone ever fitted a gearbox from an alternate manufacturer that can handle the torque involved?

[Anthony 1,000]

For what it's worth, the 306 diesel boys are routinely putting 250lbft+ (and some in excess of 300lbft) through BE boxes and they don't seem to be suffering gearbox failures, despite in a few cases a distinct lack of mechanical sympathy.

 

Some of those cars have done significant mileage since being tuned suggesting no particular longevity issues either under normal road use.

[adman 5]

yeah but this is mainly going to be a track toy, and i may be wrong but i can't imagine a BE liking the torque and rpm involved. Plus the gearing from the diesel box will be miles out from what we want.

Edited September 16, 2014 by adman

[Tom Fenton 1,525]

That torque level is at a lot lower engine speed and hence power level though, so in terms of energy there is less work being done by the gears despite the torque being similar.

Allan and I were discussing this, it seems the supercharged 306 boys have problems with 2nd gear?

[Anthony 1,000]

Allan and I were discussing this, it seems the supercharged 306 boys have problems with 2nd gear?

That on the 5 or 6 speed 'boxes Tom? The 6-speed units use finer pitch gears from what I understand and it's far from unheard of for them to strip cogs even on a standard car (typically 3rd AFAIK) so wouldn't be much of a surprise that they would fail with a whole chunk more power/torque going through them.

[welshpug 1,622]

3rd and 4th is the typical supercharged fail in the 6 speed unit, I've heard of it in a naturally aspirated 2.0 rally car running a 5 speed box with the gti6 3/4 cluster in it to totally munch 3rd, plate diff and rally cut slicks!

[allanallen 528 2 Cars]

Yeah it's the gti6 3rd/4th doofer that Ash is/was having reproduced but straight cut and dog engagement. Possibly a recipe for disaster but we shall see!

[Tom Fenton 1,525]

I think that 3rd and 4th in the GTI6 box are the same as the 5 speed boxes as the main casing is the same. I think it must be 5th that is smaller as it and 6th have to fit in the end casing, which is the bit that differs in the 6speed boxes.

[welshpug 1,622]

the thing that differs is the depth of the teeth on the 3/4 cluster in the 6 speed box, most have a lower tooth count and taller teeth.

 

you have to remember that the box is 55mm longer, so I don't think 5th and 6th are narrower at all.

[Miles 331 1 Cars]

The later box's have finer teeth for refinement as there's less gear clonking for a teccy term, 3 & 4 are bad as are 5 and 6, 1 and 2 are OK thou and use the deeper cut gears.

God knows why some people use the GTi6 3 and 4 in there rally box's, yes it's CR but reliable as a chocolate teapot.

The same goes for the larger input shaft bearings, Yes good in one way but the case's break between the bearing's then, some used metal plates to try and hold them together but this never worked.

The Dog gears are in full production, I have made up a box for a customer with these in there, The idea of Dog and Syncro is odd to say the least, but if it works all well and good

[allanallen 528 2 Cars]

Haha, yeah it'll be odd when you get muddled and try and do a clutchless 1st to 2nd at 7.5k

[adman 5]

Even if the gears they had made up are any good, It will only move the weakness to the next point which will be the casings.

Hence why i'm looking at fitting the ML5T box.

Think i may need to try and start a group buy for a plated diff to at least see if its fees-able.