#1
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diff and gearbox
im looking for info for my build i would like to know what would be the best diff 7" or 7.5" and what would be the best ratio and which gearbox mt75 or type 9 5 speed or 4 speed thanks
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#2
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A good starting place is probably what engine you would like - Do you have any preference? Car engine or bike engine?
Are you going to be using a donor car, or collecting part individually? Will the build be sierra or mx5 based? |
#3
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well im going down the sierra route but hoping to put a 2 litre zetec in it as im only just starting i need a lot of tips and help i suppose
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#4
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Options
This site will certainly help with regards to fitting a Zetec, http://toyne.org.uk/zetec-engine.html
I would go with the type 9 box as gives you more room for your feet, Good luck with your build and have fun.
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Be Lucky, Mike. |
#5
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thanks mate
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#6
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The book chassis is meant for the 7" diff, but if you had a 7.5" one, you could easily make the diff mounting plates a bit wider to accomodate that.
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Albert Haynes Roadster FAQ | Haynes Builder Locations Gallery, build thread in Lithuanian / via Google Translate. |
#7
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thanks i havent got the diff yet but ill probably get the 7"
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#8
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i would think the 2 main questions would be
1. what engine are you planing to use 2. what do you plan to use the car for? |
#9
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Diff ratios most common are the 3.6 & 3.9
If fitting drum brakes the push in type if discs bolt on type Gearboxes ratios are generaly spaced to far apart as they are designed to launch a heavy saloon car with 4/5 people and luggage of the line meaning if you run a 3.9 diff 1st is all finished by 20/25 mph but 3rd is good and you can max the revs in 4th, 80 is about 4000rpm in 5th I fitted the V6 type 9 with bellhousing spacer, 1st still a bit low and tyre/wheel size can help The MT75 ratios are even wider and would suit the 3.6 diff better [Type 9 (1.3-2.3) 1st 3.65 2nd 1.97 3rd 1.37 4th 1 5th 0.82 Type 9 (2.8 inc 4x4 ) 1st 3.36 2nd 1.81 (this is the ratio that lets the 2.8 go over 60 in 2nd ) 3rd 1.26 4th 1 5th 0.825 Type 9 (P100 HD) 1st 3.91 2nd 2.29 3rd 1.38 4th 1 5th 0.82 There is a T9 diesel box too, but I'm unsure of those specs (I'd imagen its something like the P100 box) I do know it has stronger bearings and a 0.75 5th MT75 (2.0 DOHC and 2.4 V6) 1st 3.890 2nd 2.082 3rd 1.342 4th 1 5th 0.822 MT75 (2.9 V6, 2.5 diesel AND 2.0 4x4) 1st 3.608 2nd 2.084 3rd 1.363 4th 1 5th 0.829 The MT75 ratios are 100% correct There are gear ratio calculators on line and as wheel & tyre choice affect overall speed in gear and your engine red line it would be worth having a look |
#10
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thanks guys
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