Project86- My first (and probably not the last) Rebuild

[TitaniumTT]

I agree with Bill, yes the BNR's can get to that level, but using the S5 turbo is really pushing it to it's limits. To me, anything over 350/375 and you really need to start looking at components that alot of people wouldn't think to look at changing to get to 400.

As for the porting, I would shy away from an agressive streetport, if you want to keep the driveability manners, I would only give the intake ports a little tickle and not change the timing very much at all, in fact, I wouldn't change the opening at all. I WOULD port the exhaust, however I wouldn't change the closing. Basically, I wouldn't change the factories overlap at all.

I would look at other turbo's too, GT35R of course comes to mind with some of the TO4's etc etc, and anything over 350 I think the stock mani is really choking the engine and the turbo. I have the data to support that on the factory twins and I suspect it to be similar on the S4/5 mani's as well.

Here's what I would do, I would do it in stages. You obviously need an engine, turbo, intercooler, ecu.

If you have an ECU and a harness, than I would run the girl pretty much bone stock until you have the coin/time to upgrade things. With an Rtek, I wouldn't go farther than upping the exhaust, and intercooler, and I would certaily spend some time on the dyno pulling some timing out and getting the L's dialed in. I wouldn't do anything farther than a BNR on an Rtek and I would figure out a way to log EMAP too. I would do this to make sure that you're not pushing the turbo too hard, or choking the engine.

Next step is prep for more ponies. This would include fuel, ignition, intercooler and ECU. Keep in mind at this point you're still running a pretty stock ECU but you'll be able to get the most out of the setup. For an ECU, MoTeC all the way, take a look at the M2R as you can get into one of those for slightly more than a haltech/microtech, but of course I would rec one of the M"hundred" series becuase of the software, it's just incredible.

So now you've got a cherry engine, all the supporting mods in place, it's time for the ponies - tubular mani and a real turbo.

It may take you a year or two to get there, but you'll do it safer, and you'll have a more reliable setup at the end of the day, as opposed to a setup that is constantly pushed to it's very limits