The great gearing question

So a tranny was thrown in with the super nifty ABF 16v (teaser shot here: http://www.mack73.com/rally/stageIII/IMG_5102.jpg)

So now I've got a choice between two different gear sets. As a complete novice I don't want to screw this up .... so which gear set would be the best. The final drive will be the same between the two.

Here are the specs:

CDA:

1 3.30
2 1.94
3 1.31
4 1.03
5 .84

AYK:

1 3.778
2 2.118
3 1.429
4 1.029
5 0.837

In listening to all of John's "advise", I know I'm after the shortest possible (AYK) but would the CDA have any advantage? My main reason against the CDA is its 3rd gear ratio

---

-Jason

mack73 Wrote:
-------------------------------------------------------
> So a tranny was thrown in with the super nifty ABF
> 16v (teaser shot here: )
>
> So now I've got a choice between two different
> gear sets. As a complete novice I don't want to
> screw this up .... so which gear set would be the
> best. The final drive will be the same between the
> two.
>
> Here are the specs:
>
> CDA:
>
> 1 3.30
> 2 1.94
> 3 1.31
> 4 1.03
> 5 .84
>
> AYK:
>
> 1 3.778
> 2 2.118
> 3 1.429
> 4 1.029
> 5 0.837
>
> In listening to all of John's "advise", I know I'm
> after the shortest possible (AYK) but would the
> CDA have any advantage? My main reason against the
> CDA is its 3rd gear ratio
>
> 94 Golf
> www.Mack73.com


You mean advice?
4th and 5th are just rounding off differences, 3.7 wit anything short would be REALLY short so by default the higher firs and second of the CDA work work better with a short final drive.
Ehaddya getting for final?
Do the gear x final thing.
Post results

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Heres a nicey graph

The lower lines are the AYX code transmission.
Road speeds are estimates based on 195/50/15 tires and a stock 3.67 final drive.



Edited 2 time(s). Last edit at 09/22/2006 05:26PM by Carl S.

john vanlandingham Wrote:
-------------------------------------------------------
> You mean advice?
> 4th and 5th are just rounding off differences, 3.7
> wit anything short would be REALLY short so by
> default the higher firs and second of the CDA work
> work better with a short final drive.
> Ehaddya getting for final?
> Do the gear x final thing.
> Post results
>
> John Vanlandingham
> Sleezattle, WA, USA
>
> Vive le Prole-le-ralliat
>
> www.jvab.f4.ca

Ah yes advice.... I guess that's what I get for growing up in the spell check age :/

Only thing easly attainable is a 4.24 but that's not much. What ratio's can you get John? Oh and you'll have to hook me up with some suspenders in the future

---

-Jason

mack73 Wrote:
-------------------------------------------------------
> john vanlandingham Wrote:
> --------------------------------------------------
> -----
> > You mean advice?
> > 4th and 5th are just rounding off
> differences, 3.7
> > wit anything short would be REALLY short so
> by
> > default the higher firs and second of the CDA
> work
> > work better with a short final drive.
> > Ehaddya getting for final?
> > Do the gear x final thing.
> > Post results
> >
> > John Vanlandingham
> > Sleezattle, WA, USA
> >
> > Vive le Prole-le-ralliat
> >
> > www.jvab.f4.ca
>
> Ah yes advice.... I guess that's what I get for
> growing up in the spell check age :/
>
> Only thing easly attainable is a 4.24 but that's
> not much. What ratio's can you get John? Oh and
> you'll have to hook me up with some suspenders in
> the future
>
>
> 94 Golf
> www.Mack73.com
I've seen a place in UK selling 4.46 which would be a good compromise so that first isn't completely useless. That's about another 9% shorter and if you think that you'll doubtless end up with taller tires, probably 7-8% taller then every little bit helps.
And sure no problem on the suspenders, I just ordered another 20 feet of steel for the 40mm inserts and I also ordered steel for the 50mm inserts I have 46 of.
So now there is choice.
Now remember theres lead time on the 40s as Bilstein build the inserts when I order them, and the 50s I have have all sorts of various damp settings so to be spot on with what we know we want, they have to be revalved so there's a 3 week thing, too.

So plan and give me as much lead time as you can.

You can feel free to call or drop by, I'm just down by the airport.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Perfect thanks for the info John. CDA sounds like the ticket

I might want to even go a bit higher than a 4.46 if they make one, maybe something in the 4.6 range. I'd still be maxing out in the 120-130 range with a 4.46

I'll be in touch about the suspenders, it will be a little bit until I've got the dough for them - gotta get a better welder and cage before I think about all of the rebuild purchases

---

-Jason

mack73 Wrote:
-------------------------------------------------------
> Perfect thanks for the info John. CDA sounds like
> the ticket
>
> I might want to even go a bit higher than a 4.46
> if they make one, maybe something in the 4.6
> range. I'd still be maxing out in the 120-130
> range with a 4.46
>

>
> 94 Golf
> www.Mack73.com
Well maybe think about 5th as just for transits, much lower (bigger number= lower) than 4.46 and first gear starts being really short.

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

ok this gearing stuff is starting to make more sense, the problem isn't the R&P - its the wide ratio OEM gearing, and no matter what R&P is chosen, its not going to make up for it - so I guess I should maximise all the available gears to put the typical speeds in a proper place in a gear (not at the top or bottom)

---

-Jason

If you throw the gearing up onto a graph (such as Quaife's little program available at www.quaifeusa.com or the Home Site which excapes me at the moment) you'll see that, generally speaking, the higher gears are spaced closer together. So a shorter R&P is still beneficial even with a stock transmission.

---

Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.



Edited 1 time(s). Last edit at 09/25/2006 10:46PM by Pete.

Yes good point - Its all about which gears I want to use - 1-4 or 2-5 to get the closer gearing up top

---

-Jason

Hey Mack,

In reading the notes here, I'd recommend that you go with the CDA and the mid-4's gearing. Then you have a chance to use all 5 gears. You would only reach 5th on occasion, but 1-4 would be very useful. And don't be worrying about calculating speeds over 100-105 in a rally Golf.

As a point of ref, we are going with a 2.95-1st/.083-5th in a new car.

Regards,
Mark B.