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BoxxerSix's Avatar
 
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G50 vs G90(90 or 96)

In retrospect to power holding(torque) capabilities, do you guys think it's worthwhile spending the money on a newer GT2/GT3 based transaxle, or just sticking to my guns and getting a rebuilt G50 with some internal work(P.M. steel syncros, gearset, etc)

I've been working on developing a hybrid/custom Porsche project car here for myself. Mid engine, RWD, single turbo LS1, ~600crank HP/tq. Car will probably weigh in the neighborhood of 2-2100lbs. Think Factory Five GTM in a different skin..FF claims to have used a G9096 in their prototype GTM with the LS7(~505hp)(and said to have paid $4500 for it according to a Grassroots article?!?!!?)

My dealer cost on a new G90.96 is ~$12K which I've heard is capable of holding that kind of power reliably. Would you trust a built and refurbished G50 to hold that 600-650 mark with ease and reliability??? Oil coolers and the supporting anchilaries are already here for such a transmission endeavor, I'm just talking about the main guts of the transaxle itself.

Eh......I don't know Post your thoughts or comments...
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Old 04-08-2007, 09:01 PM
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I think that may be too much power for a normal G50.
However the G50/50 & the G50/52 would be OK. But not the G50/00 to G50/03
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg

Last edited by NathanUK; 04-09-2007 at 02:44 PM..
Old 04-09-2007, 02:20 PM
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Quote:
Originally posted by NathanUK
I think that may be too much power for a normal G50.
However the G50/50 & the G50/52 would be OK. But not the G50/00 to G50/03

Yea i'm not even considering a 50/0x. 50/50 is just a rare box. A built 930 box is out of the question as well... I wouldn't mind a 50/20 if i was re-assured that it would hold the torque, but i'd like to keep the total on this piece under $10K. I'd imagine adding an Quaife and a billet diff cover would help a bit, as would a direct oiling system to the gearset but I'd "sleep better" knowing hard facts.

I know very little about the GT3 derivative of this gearbox other than it was apparently designed from the 993 GT2 box which we know holds stupid power.

I'd love a 993 6 Speed, but they're far and few between it seems. Even G50/20's are getting scare(damn you Ultima guys!!! )
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Old 04-09-2007, 07:31 PM
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The normal Carrera G50 will hold that kind of power! What do you think Juan's car had? It was just a blown Carrera! So's Mike Rombotis's twin turbo Carrera! Mine also has the normal '87-'89 G50 too. They are very tough boxes
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Old 04-09-2007, 11:12 PM
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600hp single turbo ls1 will put down 600+ ftlbs of tq the last one we did on a stock z06 single turbo gt4088 on 8 psi just for some refrence
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Old 04-10-2007, 10:52 AM
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Wow, I am surprised that Juan's car had a plain G50. Considerign the money spent I would have thought it was a stronger box.

AFAIK the G50/50 and G50/52 are the best, even stronger than a 993 box.

I just found out the G50/20 is a 993 6speed.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg

Last edited by NathanUK; 04-10-2007 at 02:52 PM..
Old 04-10-2007, 02:25 PM
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Of all the "G" boxes I will say the stronger is the G50/50, but it is a 5 speed, the G5020/21/23 etc. they also can handle the torque, I have use them in 800 hp builts without any problems, in the later you should install a billett side cover, it will help stabilize the ring & pinion under high torque loads, also on both type of trannys the synchros should be replaced with steel ones, Candy.
Old 04-10-2007, 06:57 PM
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Quote:
Originally posted by ssetek
600hp single turbo ls1 will put down 600+ ftlbs of tq the last one we did on a stock z06 single turbo gt4088 on 8 psi just for some refrence
Zo6 LS6 engine? Good flowing heads I'm using a GT4094R and building my headers right now for the setup. TMIC is next. Shooting for 6-650 for now on the LS1(Eagle crank, Manley rods, Mahle pistons) and using meth injection. Few other top end parts to keep it all together, but nothing crazy. The math i did estimates .8 bar will get me those numbers. Going to try keep stock port heads(stainless valves) and possible stock cam.

good info though, always nice to know what others are doing and what the outcome is
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Old 04-10-2007, 07:09 PM
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Quote:
Originally posted by Candelaria
Of all the "G" boxes I will say the stronger is the G50/50, but it is a 5 speed, the G5020/21/23 etc. they also can handle the torque, I have use them in 800 hp builts without any problems, in the later you should install a billett side cover, it will help stabilize the ring & pinion under high torque loads, also on both type of trannys the synchros should be replaced with steel ones, Candy.
I'm definitely going to use the P.M steel syncros, and oil cooler with pump. I've heard of and seen these billet diff covers on a couple Ultimas and was considering that too, along with a good differential(Quaife).

I'm thinking of having Dan @ Hairy Dog Garage setup this transmission. Great guy that really knows his stuff. I trust him more than myself when it comes to the transaxle internals.

Thanks!
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Old 04-10-2007, 07:18 PM
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Try to use the Paul Guard diff., (clutch type), in my opinion the torque biasing diff. is useless on high torque applications, but if you still want to use it, use the Guard stuff, much better quality, imho, Candy.
Old 04-10-2007, 07:29 PM
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Yep, Paul Guard has a great reputation for the big bhp cars trannies.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 04-11-2007, 11:26 AM
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Quote:
Originally posted by BoxxerSix
Zo6 LS6 engine? Good flowing heads I'm using a GT4094R and building my headers right now for the setup. TMIC is next. Shooting for 6-650 for now on the LS1(Eagle crank, Manley rods, Mahle pistons) and using meth injection. Few other top end parts to keep it all together, but nothing crazy. The math i did estimates .8 bar will get me those numbers. Going to try keep stock port heads(stainless valves) and possible stock cam.

good info though, always nice to know what others are doing and what the outcome is
that was a stock ls6 zo6 with meth injection,

built motors like you are doing you will just run out of turbo brfore you run out of engine, we did a built 408 lsx block with a 42r and put down 855rwhp on pump gas
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Old 04-11-2007, 07:04 PM
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Awesome, good info guys! Looks like I might actually get this car moving, that is as soon as I build the frame for it
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Old 04-12-2007, 10:38 PM
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The later gearboxes- G 96 are cable shift and more trouble than you need to go to. The 993 TT box is the one you want if you are going to 6 speed . The 5 speed G50/52 is the stongest of them all and will without question do the job.
The " normal 993 6 speeds the G 50/20 & 21 will do the job if you are not repeatedly violently shifting or standing starts.. You can upgrade these boxes to essentially the same internal spec as 993 TT box( which in itself is essentially the the same as GT3 or 996TT) Hope that is all clear!
Old 04-14-2007, 07:44 PM
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