Front brakes for a Harrison

[Merv and Sharon]

Warren, I am also getting the Nissan R32 diff that Warwick fits. More than pleased with its reputation. It seems to have 4.1 ratio. Using a calculator and planning to use the T56 6 speed gearbox (and 17" wheels, etc) I have been working out that I seem to do OK at the rpm @ 100km/h 'test'. This is mainly because the T56 6th speed is supposed to be about 0.5. Does this make sense or should the Nissan rear end be reduced?

[400TT]

You will also need to see how suitable 1st gear is, i.e. whether it is too low. Also whether 2nd gear is suitable for low speed corners etc etc.

Then as you mentioned above, is overdrive(5th or 6th) suitable for cruising, can you get into it at suitable speed and not be running too many revs at cruising speeds. You also find there is always a sweet spot for cruising revs where the engine/exhaust is quietest.

For track use, then correct gearing makes a huge difference, different tracks favour different gearing both for corners and top speed down the straights.

Like most things, it's all a compromise and personal preference comes into it as well. So it might be something you need to road/track test yourself first.

[Merv and Sharon]

Thanks Craig. Yes on paper it looks well managed with the low ratio diff and the O/D 6th on the T56, but in between is where the interest may lie. I guess one can always alter diff ratios later, depending on needs.

Merv

[WKB]

Merv,
There are some big power nissans that are used in all types of motorsports using the R200 differential.
The R32 GTST rear end that is mainly used has a 4.3 to 1 ratio. The R32 GTR rear end has a 4.1 to 1 ratio. GTR rear ends can be used but as there are slight differences between the GTR and GTST rear ends and there is a fair bit more fiddling around to fit them(I speak from the experience of fitting a GTR rear end).
A couple of cobras I know that have 4.6 ltr quad cam fords and GTST rear ends that use second gear to take off most of the time. One has a T56 and the other one has a T45 gearboxes.
As Craig said the best way to find out what is right is to drive the car first, then modify if needed to suit your needs.

Warren

[400TT]

Warren's understating the differences between GTS-T & GTR rear-ends. Just about everything is different between them. You would think Nissan would have kept as much the same as possible, even the way the carrier mounts in the cradle is totally different. You also have another very similiar rear-end to the GTR, that's the R32 GTS-4. I've just recently been GTR diff shopping and it's a nightmare. Seems the easiest way to spot a GTR diff(from GTS-4) is to look for the LSD oil sticker. Or if it's not there, try and turn the drive shafts to confirm LSD type.

In my books the only reason to chase a GTR diff is to get the (very impressive) mechanical LSD. All the rest are viscous LSD. The 4.1 ratio can be considered a bonus I suppose.

You can see why most Harrison owners just use the GTS-T rear. GTR rear is just not worth the hassle.

The same goes for people thinking that front R32 GTR calipers are the same as R33 GTS-T calipers, they look similiar, but have numerous differences, one difference can cause some inconvenience when upgrading to bigger rotors. R32 GTR caliper is better for bigger rotors, but the R33 GTS-T caliper looks to be a stiffer unit, so who knows which is the best.

[Merv and Sharon]

Thanks guys! Seems leave well enough alone and see what one gets. The T56 seems to have good cruising capability on paper. The only question is if first gear is useable. Time will tell.

Merv