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Hi folks,
Is there a simple way to drop the revs out of a trimatic without doing the diff and colour gear tooth change over, or complete rear changeover ? At 80-100kph I am pulling 3300 rpm with what is supposed to be a 308 diff. If crusin on the flat at 100-110 is 3300. Doing 80kmh up a hill its 3300.
Is there a simple way to drop the revs to say 2500rpm without going to 2.78 ? Is there a Trimatic overdrive conversion kit. Maybe a T400 will do ?
I wanna keep the T-bar look but add some smarts and reduce revs and fuel usage. I do a lot of work at 100kmh. So Byron & Dr T put your thinking hats on.
Cheers John
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What motor are we talking here John? If it is a turbo block 308, easy peasy, bolt a T700 from VN/VP behind it.
I have heard talk that you can now get adaptor plates to bolt the V6 T700 up to red motors...not a fan of adaptor plates myself, but may be w
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doesnt sound right to me. I think your diff is wrong... You think that top in the trimatic would be 1:1.
I have a 3.36 diff with a tri and at 100k's it is exactly 3000rpm. I would be checking out the diff gears first.
HTH
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I have had a T700 box behind my 202 runs beutiful with 3.55 diff however if you are running big horsepower I wouldnt recomend it I've blown 3 up before conveting to manual
good luck
charles
If all drivers were enthusiasts there would be less accident
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Oops sorry guys I knew I maybe a boo boo AFTER I posted.
It as a bog standard 253 M40 with standard carby. I double checked my ID plate and going by the plates is says GV3. My Monaro book says GV3 is 2.78 !!!!! Now I am confused I felt like I had a 308
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Tru bluhq, that woeks out right according to a gear ratio/speed program I have..
Working on an M40 having ratios of;
1= 3.13:1
2= 1.99:1
3= 1.36:1
4= 1.00:1
and a 2.78:1 diff..
3rd should be 78km @ 3500rpm (close) and 100km in 4th should be 3300 |
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Those who are a bit clueyer with their maths can correct me if I am wrong but a T700 has a 4th gear O/D ratio of 0.73:1 so a transplant would give you 100km @ 2410rpm.
Seems to me like that is a pretty big difference.
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What tyres are you running? This will drastically affect the engine speed. Also, when doing rev calc on an auto, don't forget converter slip. Although a trimatic is 1:1 the revs will vary for the same road speed dependant upon if the vehicle is cruising, |
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Hi Mr Void & Byron,
Yep those gearings are what I came up with too. A 1:1 in 4th as you say.
I run bog standard tyres too ! In fact I should sell the tyres on ebay they are something like 25yo rubbers. The 4 road tyres are Bridgestone Computer Cats
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Hi John,
Yep, 4th in a T700 is in the region of 0.75:1 so it will cut your revs by about 25% in top.
You can get an adaptor to fit one of the early T700 (pre-electrics) to an Aussie pattern block. You may need to rig up something to lock the convert
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Hi Qute,
I have found Castlreagh Street Shop in Melbourne has adapters. Will call then Monday to see if its worth the effort. I have changed the fluid, its clean. As for the bands I was told the unit was only serviced a short while ago. I have the GMH
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you should be doing about 2200 to 2300 rpm with a 2.78 diff in top gear (1/1 ratio) at 100 kph.
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Hi John,
Aren't you in Sydney? Aren't Dellows in Sydney too??
Did one of your Quaddies come off a Blue 253? It should then be jetted, etc. pretty close to right for your 253. If they are off 308's, you'll have to set them up for the 253.
450/465
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Hi all just my two cent's but I would find out what you a running in the ass end as it sounds to me that your running a 3.55 as this is the setup in my tonner but I do heavy towing with it Cheers Jim
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My Qtonner ran 3000 rpm at 100k, with a 202. I would get the tacho checked maybe its wrong. I can't believe a 253 is going to rev more than the 202, the tonners had the lowest diff ratio.
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Also the diff may have been changed and the plate could therefore be wrong. The best way to check ratio is to do a run to get oil warm, drain the diff, take the plate off the back and physically inspect the crown wheel and see what it is marked that way t
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Update for today.
I have checked the on-car VDO tacho with my old test unit that I have tuned all my cars with, and both match.
I have also chocked the wheels and jacked up the HQ. One full rev of the prop shaft doesnt quite make 3 full revs of the
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To JimBriarHill - i did take the cover off, just to be sure....its 2.78 !
To Johnperth - took 2 hours and a sh*tty wife to get it done. Jack the RHS body up, work upside down, scrape all the gasket off and remove this black sludge that smelt like hypo
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Hi mate, I noted that you have 2 spare manifolds with carbs. Are they for 202 red? I am from malaysia and would like to look for these thingys to improve my HZ Stato's perf and economy. My email ; [email protected]Cheers mate. H Mayer
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Hi Hatish,
Sorry the spares I have are for red V8s. Cheers, John
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