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Dec 17, 2020 22:20:06 GMT
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Sometimes the smallest first steps are the greatest. Nipped round the parents tonight to get the car ready to be moved to mine at the weekend. Took awhile but managed to get the rear section of the roof lined up and a few welds to hold it. The front section is bolted to the windscreen frame. You can see where the roof was originally cut off. I’m not sure what was used to do this? Sthil saw, hacksaw or maybe a blunt ice cream scoop. It wasn’t pretty anyway.     Once it’s home I can then tidy it up and make some pieces to fill the gaps. There are two patches of rust that will need attention but are straight forward enough as do the drip rail on the drivers side.  The rear valence is resembling a sive so that needs replacing but I’m pretty sure we have one in the loft. Having a good look round it and apart from the two floor pans and a piece on the bulkhead that pretty much sums up the major welding. Did manage to find the old trusty bead roller to. Proper piece of kit.  Fingers crossed she will be home by Sunday dinner. |
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Dec 20, 2020 19:47:23 GMT
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Omega gearboxes are a direct fit.
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Omega gearboxes are a direct fit. I believe so. Think it’s the 2.5 or 3.0 v6 box. Need to see what the omega diff ratio is then compare that to the scooby diff il be using to see if we’re in the right ball park. |
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You can also get plates for around £120 to fit an RX8 box, theres not much room between the small triumph chassis rails around the gearbox so size will also need to be a consideration.
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You can also get plates for around £120 to fit an RX8 box, theres not much room between the small triumph chassis rails around the gearbox so size will also need to be a consideration. Yes I’ve seen these. £115 seems a bargain. Apparently the ratios in the 6speed usually mean 1st gear is redundant on most swaps. |
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I have a surplus RX8 5 speed. I decided it wasn’t going to fit in my GT6 though.......
Subaru R160 come in 4.11, 3.9 and 3.54 IIRC. Latter is fairly rare.
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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3.9 scooby one should match up with the omega box
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So after a few hours researching and calculating we have a few options.
Looks like the most common Subaru r160 diff is the 3.54. These usually come with a viscous lsd so not all bad. So where does that leave gearing. Basing it on the smallest tyre I’d ever think of running (195/45/13) and a rev limit set at 6500rpm, the 3 box options are as follows.
Omega r28/r30
1st - 28mph
2nd - 50mph
3rd - 79mph
4th - 109mph
5th - 129mph
Rx8 5 speed
1st - 31mph
2nd - 54mph
3rd - 78mph
4th - 108mph
5th - 135mph
Rx8 6 speed
1st - 28mph
2nd - 48mph
3rd - 70mph
4th - 91mph
5th - 108mph
6th - 137mph
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Considering the gt6 top speed was barely over 100mph (107mph) and a engine pushing just over 100bhp any of these boxes will be suitable. Probably rule out the 6speed. So leaves either a rx8 5 speed or the Vauxhall r25/r30 box. Think it will come down to packaging it all in.
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With the Saab engine it'll easily top out all of those. Although the GT6 isn't a terribly slippery shape by modern standards, it does have a teeny tiny frontal area so winds up not being that bad aerodynamically.
With 200hp on tap you'll probably be capable of somewhere over 150mph.
Still, it's likely all about packaging. Personally I'd be leaning towards trying the Omega box first as it's a direct fit so you won't have the 1.5" adapter plate spacing the gearbox back (or engine forwards). Not sure how the rest of the box compares to the RX8 'box though, so the other could fit better. Not sure!
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sonus
Europe
Posts: 1,392
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Cool project! Regarding the choice of gearbox I'd chose the one that suits accelartion and shift points between 1st, 2nd and 3rd best, possibly nice rev range at 70mph cruising speeds. Max possible top speed wouldn't be my reason for choosing. I've driven my 1968 TVR Vixen at 191 km/h on the autobahn in Germany and once is enough for me, never again!
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Current
1968 TVR VIXEN S1 V8 Prototype
2004 TVR T350C
2017 BMW 340i
Previous
BMW 325d E91LCI - sold
Alfa Romeo GTV - sold
Citroen AX GT - at the breakers
Ford Puma 1.7 - sold
Volvo V50 2.0d - sold
MGB GT - wrecked by fire
MG ZT 1.8T - sold
VW E-golf Electric - sold
Mini Countryman 1.6D -sold
Land Rover Discovery TD5 - sold
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Outright top speed isn’t something I’m overly bothered about. I drive a hgv doing abnormal loads so my usual pace is 40mph so 80 seems warp speed to me 🤣. I agree a nice 70mph and Rev range is better coupled with a nice group for quick blasts through the gears. Although next to a zetec motor the rx8 box is a fair length in comparison to the omega box.   Another plus to the omega box is that the gearstick is remote so I can move the position either forward or rearward to suit the driving position where as the rx8 is fixed. The benefit of a gt6 (or small chassis triumphs) is that they don’t have a gearbox tunnel just a moulded cover that screws in separately. So although bulky a new aluminium cover could be made to cover the omega gearbox without having to cut in to the propshaft tunnel that looks like I’d have to do to fit the rx8 box with it’s extra length. |
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Is it a B234R or the low pressure turbo? If you download TX suite for the ecu, you can fine tune anything in the fuelling tables, boost control via the APC and injector and spark timings (remember to always use resistor plugs though).
The Saab water pumps don't really like >5500rpm due to cavitation issues at higher speeds.
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Interesting about the pumps! Wonder if there's aftermarket ones with different blade geometry.
Ah, I can see why people struggle to fit the RX8 box. The chassis narrows quite quicky after the stock gearbox. I bet it's doable, but not without clearancing the chassis.
Omega box looks a better bet as it's so short.
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Not read all the way through, but if it helps there is a five speed rx8 box from the 192 model?
I know what I say next might not make me popular, and even force me to get my coat, but if you're not going to have a six cylinder (it really should have a six cylinder IMHO!) why not have a look at the low power rx8 engine and gearbox? Or the full on one (231bhp) as the shorter length of the engine might allow for the length of the gearbox?
It would still be unique (or at least part of a very exclusive club!)
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The wiring for the Saab conversion is very simple, as long as you have the correct engine loom there's only 3 connections to be made.
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