hey guys im thinking of buying another diff for my ea, my cars a 3 speed auto, i got told the diff ratios are shit on these (as are the transmissions) so i want to upgrade to make it a bit quicker, i dont care about top end speed all the much, i just want to be able to get off the line quicker and have a repectable 0-100 time. any one got any ideas??
what model e-series came with a shorter ratio diff??? I would like lsd too?? if any one has any suggustions and knows what model it came out on feel free to add your opinion.
also how much does a second hand diff cost from a wrecker???
Some EB XR8's came with 3.27's as standard like mine before I changed it. But you cant go past a 3.45 for drivability and performance. Problem is where to find one in good condition!
Beware of going too high in ratio as you torque will be used up too early as you accelerate.
Anything between a 3.23 to a 3.45, 3.7's maybe should be fine for your current setup.
I have had my car with a 3 speed and 3.23 diff. It was a huge improvement over the 2.77 diff. At 100km/h it sat on 2700rpm. I would not suggest anything much higher then that.
If you are not concerned with driving the car on the freeway, and don't care about rpm.. a set of 3.9's or 4.11's with a few breathing mods like exhaust, intake (cam would be good) will have you a nice quick car!
Ive got 3.08's (4speed Series 2 EA) and sit at arround 1700rpm at 100kmh, and still find it slow off the line, and as the 3 speed has the same 1/2/3 ratios as the 4speed i wouldnt go for 3.08's if your making a change. 3.23/3.45 would be the way to go.
I got a bif tag hanging off mine that says 3.45:1 - It can't be the wrong transducer gear because it came straight out of rollins car, even if we mixed them up, how can the tacho start reading 200rpm higher at the same speeds?
Keep in mind guys that the diff tag can easily be changed, so there is a chance it could be wrong.
Best way to check is by turning the tailshaft and compring the ratio of turnes from it to the wheels.
Sorry to take this sort of off-topic but I fear that my rpm reading/speedo is slightly out.
History - I had the car dyno'd a while back when I had my 3.08:1 single spinner, and the speedo check showed that my speedo was out by 4%, at 100kmh on my speedo my actual speed was 104kmh.
Calcs - My current tyre set up 225/50 has a diameter of 610mm ( measured ) which at 100kmh turns at 870rpm.
The tailshaft then turns 3.45 times faster at 3000rpm to which the gear box converts 4th at 0.68 and the engine should be at 2050rpm.
Now the problem here is that I am showing 90 rpm slower at the same speed as 1950rpm at 100kmh. Which is 4%, now as far as I can tell, the dyno operator explained to me that my speedo was reading slow, but usually on a stock car it reads fast.
My car is now reading fast, so I've shifted my error by 8% in the wrong direction.
Two wierd things about this, 1) if I put the 3.08 gear back in by mistake then there would be no change, 2) the 3.45 gear should have changed the amount by 11.2%.
Now the only thing that makes sense is that the tyre size is 5% smaller than stock, in which case woul dmake the reado read ~5% fast, which would marry in with the fact that 1950rpm x 1.05 (adding 5%) equals ~2050rpm. The very rpm/speed combination I am after.
So in short, me speedo is still out by 4% or so and its got nothing to do with the ratio change, its just furked!
I agree aaron, you'd have real street weapon with that combo!
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