Top speeds on track (atmo engines)

Rocket man.

Are you on a 2.0l now G? Throttle bodies?

What size road tyres and track tyres do you use?

 

speeds above are with an 1.8 kr on ITB's, 2.0 seems to get to those speeds quicker

rev limiter is 7.5 k

road tyres 195 45 15

track 195 65 15

 

Our rocco is geared to do 116mph at 7500rpm in top and it does Donington in low 1:20's.

It should be slightly better aero than the Mk1 Golf aswell.

 

I`m no expert but would say the 90mm would be OK, I`ve had them for six years hard use (with Quaife ATB) and only replaced two oil seals.

... what`s the difference between the Kaz and a Quaife ATB ?

 

Spot on Mike...Silvertone GP is F' Quick!

 

good to see you you back graham

 

I wouldn't mind a few more views on using the 90mm flanges with a strong diff, I may have to venture this way if I can't find any cabby/rocco driveshafts. 6 years hard use sounds good enough for me!

Regarding the differential, the Kaaz is a clutch plate type differential, the Quaife requires slip to occur before it locks, whereas the Kaaz works full on from ~60lb/ft of torque. Lifting a wheel over a kerb, the Kaaz stays locked.

More info, probably explained a lot better, on the Kaaz here.

 

Cheers bud

You can use the STD shafts and machine the inner end to take the 100mm CV's.

I did this on my car and never had a problem.

 

Thanks for the info ..

Sounds like the Kaaz would work the drivetrain a little harder.

 

i'll let you know what speed i hit up the straight at knockhill on monday night. if it's dry i'll have the intermediates/slicks on the 13's i doubt i'll hit the top of 5th but might get close if i can bullet out the hairpin and trust the brakes enough.

 

Thanks for that Graham. Quite an easy task? Any dimensions/images of how it needs to be?

Certainly will it seems, that's why I'm a little concerned with the CV/driveshaft strengths and which route to take. Although it is near standard engine output figures for now.

 

I can’t remember the exact amount to be taken off but it’s about 1.5mm off the shoulder that the CV sits against and enlarge the circlip slot by .5mm.

Don’t go buy those sizes, if you put the 100mm CV on the shaft you will see what needs to be taken off right away.

I did this back when i first built the car and never had a problem with it.

 

I get about 120ish on the speedo at Goodwood
about 115 at combe and
about 120 at donny.

Thats a mk2 9A on k-jet with an O2A raddo 16v box and 195 50 15 tyres.

 

A good thread this. Its something I'd been meaning to ask for a while.

So it seems like a top speed of no more than 130mph (obviously depending on power) is needed for the majority of circuits in the UK.

What final drive will achieve 130mph @ ~7200rpm in an 020 box?

 

Thanks again Graham.

A 4.1 final drive ratio will see 130mph @ 7200rpm on 195/50/15's.
(4.2/127mph, 4.46/119mph, 4.64/115mph)

 

Cheers mate.

Which boxes are they available from and how ease are they to swap?

 

will have to see what gears & fd to put in a box for my 2.1 8v to top out at about 120-125 at 6300

 

I dont think any of these are standard ratios, I think the shortest OE one is 3.89(?) As found in the Mk1 1.6 GTI gearboxes and a couple of others.

Available ratios were found on the Bildon site, Ring and Pinion Sets.

 

A standard Mk1 1.6 GTI gearbox (3.89) would take you upto 120mph @ 6300rpm Mike.

a Mk2 16v '2Y' 3.67 equates to 127mph @ 6300rpm.

Both on 195/50/15.

 

thanks for that mate (copied that info onto my HD).

I gave away a 1.6 box a few years back.......