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Acceleration

Hammy 17 May 2013, 12:24pm
Hi as some of you know I have increased the rolling radius on my MX5 donor and was wandering what I can do to regain the acceleration lost because of it. Any ideas??
WorldClassAccident 17 May 2013, 12:53pm
Change gear ratios or possibly something in the rear diff?

Or the Clarkson solution MORE POWERRRRRRRRRRRRRRRRRRRRRRRRRRRRR!
Hammy 17 May 2013, 1:24pm
previous experience tells me diff but waiting for expert...
WorldClassAccident 17 May 2013, 1:48pm
[img]but waiting for expert...[/img]

then please don't wait for me but I would have thought the diff would be easiest although more power wouldn't hurt...
Hammy 17 May 2013, 2:08pm
power wont change the ratio and apart from forced induction Ive done every other mod
WorldClassAccident 17 May 2013, 2:24pm
Won't change the ratio, agreed, but will provide more power to spin the ratio you have but then it sounds like you have done that already. I shall step down and await an engineer.

Have a great weekend!
oxford1360 17 May 2013, 2:30pm
Acceleration may have gone, but the theoretical top speed with those rears must now be about 500mph.
tonyt 17 May 2013, 3:28pm
I looked into turbos awhile ago, but its expensive, around £2000 but I did find a self contained unit with no oil feed, not sure how they get away with this but it would be easier to fit.
redratbike 17 May 2013, 6:49pm
Change the diff i'd say find a different ratio one...must be different ratio's available....go pick the brains of the guys on the mx5 forum
landmannnn 17 May 2013, 8:56pm
Yeah, I think there are 4 different ratios, 1.6 engines the lowest.
mx5teo@planet.nl 18 May 2013, 6:32am
Use the diff from the NB 6 gear but then you need the axles as well.
Mister Towed 18 May 2013, 9:24am
Is the gearing so tall that it's undriveable?

Unless the motor is so peaky that it can't comfortably pull away from a standstill I'd be tempted to live with it.

If you're planning on drag racing or short circuit track days perhaps a second set of (smaller?) wheels with lower profile, sticky track rubber would address the issue, but on the road I wouldn't worry about 0-60 acceleration.

Once you're on the move just use a lower gear for overtaking, leave the boy racers to spin their wheels away from the lights outside Tesco and revel in just looking cool cruising in your stunning ride. :rockon:
Hammy 18 May 2013, 5:51pm
Mister Towed wrote:
Is the gearing so tall that it's undriveable?

Unless the motor is so peaky that it can't comfortably pull away from a standstill I'd be tempted to live with it.

If you're planning on drag racing or short circuit track days perhaps a second set of (smaller?) wheels with lower profile, sticky track rubber would address the issue, but on the road I wouldn't worry about 0-60 acceleration.

Once you're on the move just use a lower gear for overtaking, leave the boy racers to spin their wheels away from the lights outside Tesco and revel in just looking cool cruising in your stunning ride. :rockon:


No its still very drivable but I know from building my 7 that this is fixable and I like the challenge
Mister Towed 19 May 2013, 2:11am
Hammy wrote:
No its still very drivable but I know from building my 7 that this is fixable and I like the challenge


OK, I share that philosophy. For a bit of (very) old school tuning you could try methanol/water injection. That'll provide more power and torque throughout the rev range without breaking the bank. Or the engine. After all, it was good enough for the Supermarine Spitfire. :plane: