Power limit GSL-SE Diff
06-16-17 | 02:40 AM
#1
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Instrument Of G0D.
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From: omnipresent
Power limit GSL-SE Diff
Ok, its a s3 rx7, last dyno-ed at 436rwhp (13b turbo) Running stock s3 diff with Guru torsen, starting to make noises, i suspect the (fairly new) bearings and possibly the gears.
Ive taken it to a diff specialist, my options are;
1) Build the existing diff with billet axles, replace collapsible sleeve with a pinion spacer, and box in or gusset the housing - $2500
2) Build a borg warner diff (dont ask me the designation lol all i know is its form a vl commodore) with a clutch lsd or a locker. $3000
3) Build a Hilux diff with an eaton truetrac $4000
Monetary values are australian and fairly competetive, both options 2 and 3 are fairly well proven to take a bit of horsepower, but option 1 is my favorite if anyone can convince me it will be able to take a hard launch on 225 wide r-compound tyres?
I have actually been running the s3 diff with the turbo engine for years and it does get noisey after a while but has never let go. But the +400hp thing is fairly recent. No one has ever managed to pop a Guru Torsen as far as I'm aware so can probably rule that out as a weak point.
All help and insight appreciated.
Ive taken it to a diff specialist, my options are;
1) Build the existing diff with billet axles, replace collapsible sleeve with a pinion spacer, and box in or gusset the housing - $2500
2) Build a borg warner diff (dont ask me the designation lol all i know is its form a vl commodore) with a clutch lsd or a locker. $3000
3) Build a Hilux diff with an eaton truetrac $4000
Monetary values are australian and fairly competetive, both options 2 and 3 are fairly well proven to take a bit of horsepower, but option 1 is my favorite if anyone can convince me it will be able to take a hard launch on 225 wide r-compound tyres?
I have actually been running the s3 diff with the turbo engine for years and it does get noisey after a while but has never let go. But the +400hp thing is fairly recent. No one has ever managed to pop a Guru Torsen as far as I'm aware so can probably rule that out as a weak point.
All help and insight appreciated.
Last edited by WANKfactor; 06-16-17 at 02:46 AM.
06-16-17 | 09:41 AM
#2
You should check with bad_83, as I know he has run high HP turboed rotaries and been through some
diff issues. I bet he can tell you some things about weak points in the rearends.
diff issues. I bet he can tell you some things about weak points in the rearends.
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WANKfactor (06-16-17)
06-16-17 | 06:32 PM
#3
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Instrument Of G0D.
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From: omnipresent
Thanks Mr Farrell, I sent him a PM.
Open to all opinions on this. The diff builder says the billet axles will be good for silly hp, and the gears will be fine once a pinion spacer is installed.
My theory is the housing and tube flex is chewing out bearings so would like to strengthen that. But I'm having a hard time believing the stock gears will be good at 5 or 6 times the power they were designed for for a long time.
That said the diff in its current configuration lasted pretty well with 330hp behind it. Never broke an axle, did have it rebuilt a couple times over the years - once for a chipped tooth in the ring gear due to bad adjustment, once due to chewed out axle bearings, which was fairly recent. The new bearings didnt last very long btw.
Open to all opinions on this. The diff builder says the billet axles will be good for silly hp, and the gears will be fine once a pinion spacer is installed.
My theory is the housing and tube flex is chewing out bearings so would like to strengthen that. But I'm having a hard time believing the stock gears will be good at 5 or 6 times the power they were designed for for a long time.
That said the diff in its current configuration lasted pretty well with 330hp behind it. Never broke an axle, did have it rebuilt a couple times over the years - once for a chipped tooth in the ring gear due to bad adjustment, once due to chewed out axle bearings, which was fairly recent. The new bearings didnt last very long btw.