25-05-12, 02:44 GMT+10#17 I wouldn't even bother with a A8 motor.. it's just wank factor lol.
Get a series 2 non turbo motor and use a 1.8mm cometic head gasket, it will drop the compression to 8:6:1.
There's a few guys on here running 9's on standard non turbo bottom ends. If you do break it, who gives a fk.. $150 and get another one.
Have a read through this.
Quote:
Originally Posted by 6BOOST
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If your engine isn't built yet, I'd highly recommend one of my head and cam packages, the cylinder heads flow 213cfm@28" with 1mm oversize stainless intake valves and 3mm oversize exhausts, 235 deg camshaft with suitable springs and collets and a JPC intake manifold, you'll need every bit of help in the airflow department you can get, and these are the highest flowing items on the market.
None of this is really a street car though, street to me would be a GT35 with 1.06 rear, rajab intake manifold, 3.5" exhaust, 8.6:1 compression and decent sized cam. You could expect a 7000rpm redline, full boost at 3700rpm, and 440-450rwhp on pump fuel and 23-24psi. It'd run 10's all day, be spastic on teh street, have more power than you could use on anything but slicks, and with race fuel up its tail and slicks, 520-540rwhp and 9.9's on C16 would be very possible.
and
I would stick with the GT35 with a 1.06 rear, and a rajab intake manifold. We have just stepped up from a GT30 with .82 rear on Andy's car, and also gone from an NA intake to a rajab, and the car has a Keas 3 speed and TCE converter. It has only had a base tune on 10psi, and after his first drive he said it is virtually no different to the GT30, either transbrake or footbrake, and fries the tyres at will. I've done much testing with camhafts and intake manifolds with my packages, and this one continues to be the one that has the best spool, being absolutely ridiculous and almost unusable, and true 9 sec potential on race fuel.
We will have dyno results from Andy's car tomorrow night on pump fuel, but I'd expect at least 430-450rwhp on 24psi or less. Its not just a matter of picking the turbo, you need to match it to the intake manifold ans the camshaft, and in this case converter. Get the whole lot right, and while it may only run the same time as tom **** or harry does, when your fishtailing up the road next to them waiting for their lag monster to come on it will be smiles all round;o) And as you have said, "street" is the order of the day.
On another note, I highly recommend you get some Spool rods, and he also has a piston and rod package, they are a very good unit, have been tested by LukeVL to meet or exceed the specifications for 4340 chromoly, and are used in some very big hp cars. With the CP pistons in his package, we shave .040" off the head and run a .053 cometic gasket to end up at 8.6:1 compression, another big factor in helping spool and hp.
So a list of mods I'd be doing to the ultimate street RB include:
6boost head, 1mm oversize intake, 3mm oversize exhaust valves, 213cfm@28"
LukeVL camshaft, 235deg@.050, 520" of lift
Rajab Intake
VPW fuel rail and injector kit
Spool conrods and .020" CP pistons
ARP Head and main studs
New nissan RB30 oil pump
N1 water pump
Cometic .053 head gasket
6boost GT35 turbo kit with 1.06 rear
Full 3.5" exhaust
Keas 3 speed auto with TCE 3300rpm converter
I'd expect from a lot of experience around 450rwhp pump fuel 23psi, full boost 3700rpm, transbrake within 2-2.5 seconds, 530-550rwhp on 30-32psi and C16, 10.7@127 in full weight calais pump fuel, 9.90@136 on C16 in full weight calais.
6BOOST
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