Postby mtcookson » Thu Jan 24, 2008 7:21 am
Quote »8. Valve springs - Aftermarket allowed, stock O.E.M. retainers.[/quote]That right there might allow a bit of increase in performance, so to speak. What are you revving to? I didn't notice any limits on maximum RPM so you may consider getting some JWT valve springs and running the engine up to about 7,000 rpm. JWT does ecu tuning and bumps the rev limiter to 7,000 and, even though the VG doesn't breath all that well up top, it has been proven to make the cars equipped with it faster.
I'd also consider putting on a VG30ET oil pump. Should be legal and offers a bit more volume/flow, which might be a good idea if the engine sees high revs for extended periods of time.
I also didn't see any regulations on actual ignition timing. I'd bump the ignition timing up to squeeze every last bit of power out that you can.
Also consider trying to get that carb as tuned in as possible. If it happens to be putting a bit too much or too little fuel in, I'd do what you can to get the air fuel ratio as good as possible. If your dyno shop has a wide band o2 sensor setup, definitely get that hooked up as fuel tuning can help out quite a bit. The rules do allow carb mods as far as the floats, jets, etc. so I would definitely take that to your advantage and get the fuel tuned as perfect as possible. Try out different jets to attain different fuel ratios and see which one offers the best performance. Do this only after any other modifications to optimize those mods (ignition timing, higher revs, exhaust diameter, etc.)
Since no aluminum flywheels are allowed you may get the stock flywheel machined to reduce as much weight as safely possible. It isn't going to see much stress power and clutch wise so machining shouldn't hurt it.
Couple questions, what kind of race is this for? Seems like it could be pretty fun.
Also, what carb adapter are you using? Just so happen to have another member looking to run a carb on a TBI VG and that adapter would make it much easier.