16 replies to this topic

[Ricky2772]

qabout the VX n/a, does anybody the value for the final drive ratio (not sure its name in english...) ...it's the couple of toothed wheels inside the gearbox that, according to their ratio, lenghtens or shortens all the other 5 gears.... I want to make all the gears a bit longer, so I need to increase such ratio....it's usually described something similar to "13/46"

[TangoAlpha]

VX220 n/a gear ratios: 1st: 3.95:1 2nd: 2.02:1 3rd: 1.35:1 4th: 0.97:1 5th: 0.81:1 Final drive: 3.95:1

[garyk220]

VXT gearbox has longer final drive. Ratios for 1st to 4th are the same, 5th is very slightly different according to the press releases, but I'd be surprised if they did change this. Might be easier to source one of these?

Edited by garyk220, 22 June 2004 - 08:09 PM.

[Pidgeon]

According to my 2003 brochure, N/A 5th 0.81:1, Turbo 0.79:1, final drive 3.95 and 3.63. FWIW, the final drive on a 1500 Spitfire was 3.63:1, if we were improving acceleration at the expense of top end, the 1300 Spit was 3.89:1. Next was the 4.11:1 herald diff. I built a screamer once and used an early herald diff at 4.55:1

[Ricky2772]

tx folks, but the bit of info I'm looking for is this: this was taken as an example from the eliseparts short-ratio gearbox, and in the description it gives out these data: : Factory c/r gearbox: 4.20 (15:63) final drive what I am interested is the "15:63" bit of info, that means how many teeth has each of the two final drive sprockets. altering such ratio (that is, replacing one or both sprockets with more or less teeth) will allow to shorten or lenghten the whole gearbox action. same as replacing the front/rear sprockets in a motorbike to make it short-geared or a more relaxed cruiser.... In my case, inceasing the power substantially with the SC, I want to achieve a longer gearing so to make better use of first and second gear, otherwise too short, and also have a longer 5th gear, for better cruising capability and higher top speed.

Edited by Ricky2772, 22 June 2004 - 10:06 PM.

[minime]

ricky...you can get a 4.17 final drive for the f23 gearbox....its from a zafaira 2,2 f23 gearbox hope this helps

[minime]

ricky...you can get a 4.17 final drive for the f23 gearbox( this will provide a lower top speed but faster acceleration)...its from a zafaira 2,2 f23 gearbox hope this helps but if you want higher speeds the f23 in the turbo i think has a ratio of 3.6

[Ricky2772]

but if you want higher speeds the f23 in the turbo i think has a ratio of 3.6

so the gearbox is the F23 in both vx and vxt then.
tx minime, I will pass the info to my tuner that will inquire at opel....

he's asking for the 1-5 gearbox ratios of the VXT as well ...anyone?!?

Edited by Ricky2772, 23 June 2004 - 06:47 AM.

[Lambo]

I expect that you will have to change the pinion and crown wheel together as a pair.

[minime]

Posted on Jun 23 2004, 10:48
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I expect that you will have to change the pinion and crown wheel together as a pair.

the final drive comes in a kit and it sounds like what you have descibed above

[garyk220]

I built a screamer once and used an early herald diff at 4.55:1

Motorway driving must have been noisy

My old Nova I raced in modified saloons had 1.04 ratio 5th gear and 4.1 final drive. 5000rpm at 75mph and hit 7700rpm in 5th gear at the end of the straight in Knockhill. Fantastic! Accelerated quicker than my 2.2 VX.

[mags993tt]

Ricky, let me know how you get on. I find the gearbox is geared too low for road driving but for a circuit the only problem is the original rev limit meaning some short lived upchanges required where the NA would not have needed it. The top speed in the mid 140's with original rev limit is probably perfect for most circuits as you'd be getting to that speed just as you hit the braking zone. The power and torque characteristics of the supercharger (I haven't rolling roaded it but this is how it feels) both are still building as you hit the rev limit - you have to look at the rev needle as there isn't the usual feeling that there are no more gains to be had by staying in the lower gear towards the top of the rev range. So the absolute ideal scenario would be to strengthen the internals to take an extra 500 or so rpm and get a sixth gear for motorway cruising - that way you get to mid 150's in 5th too and of course better acceleration out of corners. Of course this is probably completely unrealistic from a cost point of view but I hope it conveys the feel of the SC car with NA gearing until you get yours up and running.

[Ricky2772]

Of course this is probably completely unrealistic from a cost point of view but I hope it conveys the feel of the SC car with NA gearing until you get yours up and running.

that is what I am trying to achieve...a cost-effective improvement over the way too short (IMO) gearing, even for standard NA.
I find first gear useless in most occasions, and in second you don't even hit 100kmh!!
on any track 1st and 2nd are outright out of the question, all you do is 3rd 4th.
I would love to employ 2-3-4 effectively, while 5th will be there for relaxed cruising or long straights like monza and such....
so, anybody has the brake-down of the VXT gearbox ratios?

[garyk220]

Of course this is probably completely unrealistic from a cost point of view but I hope it conveys the feel of the SC car with NA gearing until you get yours up and running.

that is what I am trying to achieve...a cost-effective improvement over the way too short (IMO) gearing, even for standard NA.
I find first gear useless in most occasions, and in second you don't even hit 100kmh!!
on any track 1st and 2nd are outright out of the question, all you do is 3rd 4th.
I would love to employ 2-3-4 effectively, while 5th will be there for relaxed cruising or long straights like monza and such....
so, anybody has the brake-down of the VXT gearbox ratios?

Same as NA for first four, 5th is slightly longer;

1st: 3.95:1
2nd: 2.02:1
3rd: 1.35:1
4th: 0.97:1
5th: 0.79:1
Final drive: 3.63:1


VXT gear ratios at 6500rpm are good for approximately;
1st 40mph
2nd 65mph
3rd 97mph
4th 135mph
5th 170mph

[dude]

maybe a sixspeed gearbox from the saab 9-3 aero should do the trick. this gearbox must be found in some opel/vauxhall model and probably easier to find than the saab-one. //anders

[minime]

ricky why dont you increase the rev limit? with the sort of power you are developing a rev limit of 7500 will give you 165mph car?

[Ricky2772]

ricky why dont you increase the rev limit? with the sort of power you are developing a rev limit of 7500 will give you 165mph car?

tx minime & gary,
well, I'm not really a rev freak....
what I like the best is a meaty, low-mid delivery.
6500rpms is way enough for me, also keeping rpms above 5500, the 2.2 really guzzles fuel like crazy, and SC could (and will) make things worse, so I'm trying to achieve a decent compromise, so not to have to go out and refuel every 5 laps or so at the Ring....

tomorrow I will drive by Delta-M in switz, to sort out the defective parts...along with the modified extra-injectors mounts (now installed ahead of the charger instead on the intake manifold) they will also provide a new ECU mapping, more performing.... it MIGHT be the same developed along with Courteney, but not sure....

Edited by Ricky2772, 23 June 2004 - 12:36 PM.