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strengthening the BTR 4 speed 

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Wed Apr 06, 2011 2:28 am 
Oompa Loompa
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No probs. I'm always anal with my research before doing any thing to my car

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Wed Apr 06, 2011 6:26 pm 
Getting Side Ways
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im guessing the clutch packs start slipping and burn them selvs out

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Wed Apr 06, 2011 9:55 pm 
Getting Side Ways
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Nice info indeed, shame they can't put a decent 1st gear in them!

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 12:22 am 
Oompa Loompa
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fairlane6970 wrote:
Nice info indeed, shame they can't put a decent 1st gear in them!


I agree, I used to think it was a power problem
but once i put the xr6t engine in I realized it
was gearing. however a 3.75 or 4.11 diff ratio
should help that

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 12:45 am 
Getting Side Ways
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Spot on, anyone on here got a BA BTR with 3.7's?

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 12:14 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

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I have the factory 3.45 LSD in my EF, and it's OK, but not quite enough to overcome the tall first gear of the BTR. Rather than go for a higher diff ratio, I had my stock torque convertor hi-stalled to 2900rpm (under $300 excl removal & installation) - and it really wakes the beast up. Snaps straight into the power band (cam is one step hotter than the XR6). Plus, lock-up still works as normal, so fuel economy on the highway is unaffected.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 1:04 pm 
Getting Side Ways
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What causes them to break is box flex. When you get box flex due to high amounts of torque it increases the clearances between gears and ends up causing chipping and fracturing of the gears, then KABOOM.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 6:21 pm 
Getting Side Ways
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Shifteh wrote:
im guessing the clutch packs start slipping and burn them selvs out


Basically yes, the chief problem with these boxes is that it dies when it gets too hot... I recommend any BTR should have a big external cooler.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 6:37 pm 
Getting Side Ways
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the sam wrote:
What causes them to break is box flex. When you get box flex due to high amounts of torque it increases the clearances between gears and ends up causing chipping and fracturing of the gears, then KABOOM.


So that heat sink pan I mentioned could be a goer.. it's supposed to stiffen the box.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Thu Apr 07, 2011 7:37 pm 
Getting Side Ways
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locknut wrote:
the sam wrote:
What causes them to break is box flex. When you get box flex due to high amounts of torque it increases the clearances between gears and ends up causing chipping and fracturing of the gears, then KABOOM.


So that heat sink pan I mentioned could be a goer.. it's supposed to stiffen the box.


Yeah that should help keep together better. Some reinforcement might also be a goer if you can work it in. Its the same as the t5 boxes. Weak aluminium.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Sat Apr 09, 2011 3:48 pm 
Oompa Loompa
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Mate in regards to the btr box flexing and causing issues i haven't heard this before.

I have heard that the t5's flex and this causes third to hit the housing
and cause hell. I have been told the biggest problem with the btr's
is cooling and oil flow.

also another big issue with the 4 speed is the radiator splitting internally
and mixing coolant with your atf.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Sat Apr 09, 2011 7:12 pm 
Getting Side Ways
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Yep got a Transco cooler fitted as soon as I bought the car.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Sat Apr 09, 2011 11:08 pm 
Getting Side Ways
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the sam wrote:
What causes them to break is box flex. When you get box flex due to high amounts of torque it increases the clearances between gears and ends up causing chipping and fracturing of the gears, then KABOOM.


you got any more info on this?
iv never heard btr gears chipping and fracturing..
im pretty sure your confused with the t5 here..
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 Post subject: Re: strengthening the BTR 4 speed
Posted: Sun Apr 10, 2011 9:20 pm 
Getting Side Ways
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I'm running the BTR97LE in my EL and it's currently pushing 220+rwkw. The box is stock and mechanically unmodified. I do however have my v500 controlling the BTR so the box is correctly programmed to cope with the extra power & torque and it's still functioning fine with all the abuse I give it daily. I guess what I'm saying is that while the BTR can always be mechanically modified to cope with lots more grunt, just programming it correctly allows it to function far better than OEM factory programming does, preventing any unnecessary strain on the BTR.

 

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 Post subject: Re: strengthening the BTR 4 speed
Posted: Mon Apr 11, 2011 10:58 am 
Getting Side Ways
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jaysway wrote:
the sam wrote:
What causes them to break is box flex. When you get box flex due to high amounts of torque it increases the clearances between gears and ends up causing chipping and fracturing of the gears, then KABOOM.


you got any more info on this?
iv never heard btr gears chipping and fracturing..
im pretty sure your confused with the t5 here..


Sorry, i meant that is what happens with the t5, but i assume with the same casing construction material you would see some similar results?

 

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