Built gearbox update page 3

Post by **newkid** » Fri Mar 04, 2016 2:41 pm

What's the best box to fit the mfactory bits into. Bare in mind that my cars a daily and not track.

Cheers

Dino · Post by **Dino** » Fri Mar 04, 2016 2:44 pm

M2f5... for a close 5th ratio

Or m2a4 for a longer 5th, better motorway cruising rpm (lower)

Ratios 1st-4th are identical between two boxes

Post by **Merlin** » Fri Mar 04, 2016 2:47 pm

Dino wrote:M2f5... for a close 5th ratio

Or m2a4 for a longer 5th, better motorway cruising rpm (lower)

This I would 100% agree with. Failing on getting hold of the M2F5 (UK 4th gen), the M2V5 (UK 97-98 5th gen) will work as well.

Edit - The M2V5 has longer 1st and 3rd gears so the M2F5 is better.

Post by **newkid** » Fri Mar 04, 2016 2:58 pm

Anyone know off hand what rpm I'd be at at 70? On the 2 boxes Dino mentioned? I'm presuming the m2a4 will be better for motorway cruising?

Post by **Merlin** » Fri Mar 04, 2016 3:00 pm

M2F5 + 4.64 FD @ 70mph is ~4500 RPM. MA24 will be slightly lower.

Post by **RattyMcClelland** » Fri Mar 04, 2016 3:15 pm

M2P4 with the 4.64fd at 70mph is at 4200rpm.

Post by **newkid** » Fri Mar 04, 2016 3:26 pm

Ok tried the mfactory calculator

m2f5 + 4.062fd @ 71mph is 3400rpm
m2f5 + 4.64fd @ 71mph is 3900rpm
m2a4 + 4.266fd @ 70mph is 3200rpm
m2a4 + 4.64fd @ 71mph is 3500rpm

this is based on 205/50/16

This sound about right?

Looks like m2f5 is the one then, doesn't look like a huge difference tho.

Post by **newkid** » Fri Mar 04, 2016 3:29 pm

@wurlycorner Got a M2f5

Post by **Merlin** » Fri Mar 04, 2016 3:35 pm

What happened to your S-SPEC gearbox that you thought was non-LSD?

Post by **newkid** » Fri Mar 04, 2016 3:44 pm

Thought I'd give it a try

Gave up when it went onto special tools about lash etc on bearings.