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Chassis Drive train, Brakes, Steering and anything else chassis wise |
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25th May 2010, 03:44 PM | #1 |
The H
Jap Spec SZ - Auto Aerotop (NA) Join Date: Jan 2007
Location: Norwich
Posts: 47
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Lexus GS300 gearbox
Hi guys,
After some advice on gearboxes, as I'm getting fed up off only having 4 gears in my SZ, and the gearbox topping out at 135! I know that the lexus GS300 has the same 2JZ-GE engine that my supe has, but it comes with a 6 speed auto box. Is this likely to be a straight forward switch with the gearbox, as the bell housing should fit easily, if not be identical. The transmission tunnel may need a little work, but hopefully nothing major, as I will try and get the plastic gear selector cover and fabricate one to fit the supra fasacia. Will I need the gearbox control thingy from the lexus, as the one in the supe will be set for a 4 speed auto box? Also, does anyone know what the GS300 gearbox can handle in BHP? So many questions! lol |
25th May 2010, 06:44 PM | #2 | |
Administrator
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Interesting idea.
Are you sure it's not the cars speed limiter stopping you go greater than 135? Quote:
It's not a swap that i've heard of before so would be interested to know how you get on. As you say, mechanically everything should line up (may need to shorten or extend the prop) it will just be all the ancillary items which would take a bit of work.
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25th May 2010, 06:57 PM | #3 |
Old Timer
Jap Spec GZ - Auto Aerotop (TT) Join Date: Jul 2004
Location: Worcester
Posts: 2,089
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Topping out at 135???
Is the n/a auto the same as the tt? I think they are... If I'm gunning it my car reaches for 4th at about the speed you say your box is out of puff. Sorry if this sounds like a dumb question but you've not got the over drive switched off on the gear stick have you? (little button should be in) |
26th May 2010, 10:10 AM | #4 | |
The H
Jap Spec SZ - Auto Aerotop (NA) Join Date: Jan 2007
Location: Norwich
Posts: 47
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Quote:
When you say ancillary items, are you talking about thepanel that sits over around the gear selector on the transmission tunnel? Or have I completely overlooked something important? |
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26th May 2010, 10:20 AM | #5 | |
The H
Jap Spec SZ - Auto Aerotop (NA) Join Date: Jan 2007
Location: Norwich
Posts: 47
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Quote:
As far as I am aware, the N/A auto box is different to the TT auto box. There was a link on a different thread that showed the gear ratio's and max HP that both auto boxes could take as well as the manual ones. The TT auto box is a lot stronger and can handle quite a bit more power. When I was looking in to doing a NA to TT conversion, I could of used my existing box, but needed to add a couple of internal bits to strengthen it. The car has had some engine work done, nothing major, but I'm figureing that 6 gears would increase top end as well as improving fuel consumption. Plus the GS300 is a semi auto with a knock forward/knock back to change gears (which makes the small boy in me very happy!! ). I like the auto box, as it's a damn sight quicker off the lights than a manual, and it is a lovely lazy drive on long journeys. Last edited by The H; 26th May 2010 at 10:22 AM. |
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23rd July 2010, 11:11 PM | #6 |
Senior Member
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isn't the diff different as well think it has a low ratio so would make it slower at top end but faster gettin there instead of changing the auto box just change the diff to a tt one that would give you a high top end
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