I don't know, but I would think not. My accountant calls it "special advertising" on my tax returns, or something like that.

With 3.9 ratio
Holinger: with 265/650R18 slick @ 8500rpm limit

Ratio Diff Mph Kph
2.570 3.909 8500 64 104 Dia 25.6in 650mm
1.990 3.909 8500 83 134
1.600 3.909 8500 103 166
1.350 3.909 8500 123 197
1.140 3.909 8500 145 234
1.000 3.909 8500 166 266

Holinger: with 280/655R18 or 310/655R18 slick @ 8500rpm limit

2.570 3.909 8500 66 106 Dia 26.1in 663mm
1.990 3.909 8500 85 137
1.600 3.909 8500 106 170
1.350 3.909 8500 125 201
1.140 3.909 8500 148 238
1.000 3.909 8500 169 272

Holinger: with 290/675 slick @ 8500rpm limit
2.570 3.909 8500 67 108 Dia 26.6in 675mm
1.990 3.909 8500 86 139
1.600 3.909 8500 107 173
1.350 3.909 8500 127 205
1.140 3.909 8500 151 243
1.000 3.909 8500 172 277


With 4.08:1 ratio
Holinger: with 265/650 slick @ 8500rpm limit
Dunlop 265/650R18 Slick
2.570 4.083 8500 62 99 Dia
1.990 4.083 8500 80 128
1.600 4.083 8500 99 159
1.350 4.083 8500 117 189
1.140 4.083 8500 139 224
1.000 4.083 8500 158 255

Holinger: with 280/655 slick @ 8500rpm limit
Dunlop 280/655R18 Slick and Dunlop 310/655R18 slick
2.570 4.083 8500 63 101 Dia
1.990 4.083 8500 81 131
1.600 4.083 8500 101 163
1.350 4.083 8500 120 193
1.140 4.083 8500 142 228
1.000 4.083 8500 162 260

Holinger: with 290/675 slick @ 8500rpm limit Dunlop 290/675R18 Slick
2.570 4.083 8500 64 103 Dia
1.990 4.083 8500 83 133
1.600 4.083 8500 103 165
1.350 4.083 8500 122 196
1.140 4.083 8500 144 232
1.000 4.083 8500 165 265

There is a good spread of speeds available for the circuits we visit. Philip Island is without a doubt the quickest apart from Bathurst, with Sandown and Sydney MotorSport park the next quickest and Winton and Mallala are the slower tracks.

I probably won't bother with 675 tall tyre and use the 655 diameter tyre as the standard (280 on the front and 310 on the rear, both on 10.5" wheels), and use 3.9 FD ratio at Philip Island and Bathurst, and the 4.08 elsewhere. Using a smaller diameter tyre helps lower CoG without having to raise suspension pivot points.

13.4:1 compression ratio, how high r u aiming for your engine speed? 9k?

We will run this engine on E85 as even FIA 107-octane (RON measure) Race Fuel at $7/litre is not OK on this spec.

I will set the ECU to limit engine speed at 8500rpm, with a steering wheel button to give me another 300rpm "on demand".

You got plenty of speed without having to worry about running out of gear on long straights. :D

Update #1 added, reflects results of dry-sump research

Jesus man this is serious car porn

Yeah, rich man's porn

Why do you think it has taken me 4 years to put aside the readdies to fund this build ....

Been planning for a long, ling time, and now is the time to start the spend.

An apt old adage is that all good things come to those who wait ....

Hell yea. Im in the same boat with my build. Probably take me just as long, but nothing as badass as your build. Cheers my friend.

Subd!!!

Update #2 added to post #2 .... Dry-Sump ordered, Jenvey ITB inlet manifold ordered (DBW option included), still in discussion with Haltech about Elite ECU being set up for VQ37VHR so I can then back-port to VQ40HRGA when built. I'll go back and edit the original post to make it line up wit the updates eventually. Lots on at present (work, personal and motorsport lives).

August 13th update - Z34 off to Haltech for forensic VQ37VHR CANbus sniffing.

PWR now offer a race spec radiator for Z34 that is straight-in fit for OEM radiator, race version does not have air-con condensor, based of the sample we sent them for my car. See PWR Performance Products | Aluminium Radiators, Intercoolers, Oil Coolers for catalogue details (should be up today/tomorrow).

Is Haltech unaware that they already have a platinum 2500 running a VHR??

This will be a full replacement ECU to run the entire car, NOT just a piggy-back over the OEM ECU.