85 replies to this topic

[siztenboots]

would be much much cheaper to fit the 7 speed box

[NickB787]

what 7 speed are available for the z22se?

[siztenboots]

none at all , Getrag don't do a 7 speed manual and probably won't ever , hence much cheaper

[Rosssco]

Fit an F40 gearbox. eBay littered with loads of them for ~£100. Bit heavier, but supposedly stronger again than the M32. You will need to work out engine mounts (might be some compatiblity) driveshafts (custom probably cheapest) and gear-linkage. Oh, and I think the rear susbframe needs a mod..

 

http://www.ebay.co.u...=item35dcdd2d54

[siztenboots]

if you did go F40 then look for a saab donor for flywheel , shafts, bearings

[NickB787]

this was from the z22se site, quote Vocky same hassle though, Hassle,Hassle I fitted the M32 6 speed box, but the F40 will be similar to install. you need to find out if the F23 driveshaft CV splines fit the F40 gearbox, also if the clutch disc splines are the same otherwise it's just a case of adjusting the linkage to fit the new selector, the vx220 F23 cables fitted the M32 box with some minor adjustements, you could use the M32 gear linkage from any astra H 6 speed car

[NickB787]

Would have thought by now there would be a sequential box which would fit the z22se or one of its defendants without stupid amounts of money needing to be spent.

[Rosssco]

if you did go F40 then look for a saab donor for flywheel , shafts, bearings

 

Yep, and given the F40 is bolted to a Z20NET / B207, there should be a compatible clutch / flywheel option already available.

 

I understand the primary issue is that the diff casing is too big for the subframe, and wouldn't physically fit, meaning it would have to be notched or slighty modified in order to fit..

 

I am also unsure whether the ratios available are what you'd want. Standard ratios are likely no better for acceleration than a NA F23, although you'd have a long 6th for crusing / top speed..

Edited by Rosssco, 10 October 2014 - 10:09 AM.

[techieboy]

Might need a custom flywheel. I think it comes with a DMF from the factory. I chucked away the F40 that came with my original donor B207R.

[siztenboots]

I chucked away the F40 that came with my original donor B207R.

how far away did it land?

[techieboy]

Depends on whether it actually made it into the skip, or not. One of the guys at the local council tip was eyeing it up when I went to throw it in the "metals" skip and told me to leave it by the side instead.

[vocky]

F40 gearbox weighs considerably more than a F23 and it does indeed require the rear subframe to be cut and welded 

 

However the one off driveshafts required and the crap gear ratios might be the death knoll for this idea 

[Nev]

What's wrong with the f23 on a Z22 ??

[NickB787]

just be nice to have 6 speed but would prefer a sequential box just lots of money

[Nev]

Bah humbug! With your torque and power (and ample revs), surely gears are almost irrelevant. All this gear ratio nonsense is just guff that people with no torque & power gossip about as a misdirection from the real problem.

Edited by Nev, 10 October 2014 - 08:53 PM.

[vocky]

Bah humbug! With your torque and power (and ample revs), surely gears are almost irrelevant. All this gear ratio nonsense is just guff that people with no torque & power gossip about as a misdirection from the real problem.

Nev is quite correct, who needs gears, fit an automatic gearbox 

[Nev]

Having extra gears is generally something needed for cars with a narrow power band. For example to get the most out of a diesel where the power band might realistically only be 1500 RPM (like on my TDCi which is on song from about 1600 RPM but out of puff by about 3200 RPM). Another good example would be a HGV truck which would have a even narrower power band and hence have something like 7 to 9 gears. With a decent (high revving) petrol engine with non-wild cams the reverse is true. The advantage of raising you rev limit and having a wider power band from (I'm guessing here in Nicks case) is from approx. 4000 to 7500 RPM. Simply being able drive/rev between those 2 wider points reduces the necessity to be constantly changing gear in order to be in the sweet spot. This would be particularly true in Nicks case as a S/C'ed engine delivers such a nice flat torque line.

[vocky]

it's quite the opposite with a NA engined car, good gearing makes a huge difference 

 

But as you well know Nev on a high bhp forced induction car gearing is less important, so you might as well have an auto 

[Nev]

Clearly you need manual gears, so references to an auto box are just facetious. I can't imagine any sane person wanting an auto box in a VX, mind you after seeing the "I want aircon in my UK VX220" thread anything is possible. I haven't driven Nick's car, but I would imagine the marginal benefit of have 6 gears instead of 5 would be offset by the loss of acceleration for the 0.4 second whist making the extra gear change and the knock on effect of making the car unstable if you were cornering. This is why a wide power band is important, which almost certainly a Harroped Z22 has in abundance.

Edited by Nev, 11 October 2014 - 04:01 PM.

[oakmere]

Would have thought Nicks car would benifit from a turbo final drive as stage 4 turbos were slower with the 4.17 final drive. Nev your car would be better with a 3 speed auto like other drag racers 😄