998 More Power
Posted 12 August 2019 - 11:59 AM
Posted 12 August 2019 - 12:21 PM
I'd say go for a modified small bore head to keep the port sizes sensible and not have to worry about pocketing the block. You'll get a nice increase in mid and top end without loosing out at the low end.
A large bore head will develop more power at the top end but if you're on the standard gearing for an '89 model that isn't going to help too much. You may sacrifice some fuel efficiency too.
Posted 12 August 2019 - 01:18 PM
The cylinder head's the key to increasing performance. Get that right and any other mods will be far more effective.
You'll need to rolling road it afterwards to get the right needle in the carb and tweak the ignition timing to fully reap the benefits.
That HIF 44 is too large for the state of tune of your engine. You only really need one this size when they're very highly tuned.
A cam change would make a difference too but that's really an engine out job. A fairly mild cam would be best with the high gearing you have.
Posted 12 August 2019 - 03:07 PM
Posted 12 August 2019 - 03:15 PM
The ideal FDR for a 998 with some modifications is a 3.44:1 FDR. Then a better cam will work well when combined with a well gas-flowed head.
Posted 15 August 2019 - 10:33 AM
A lightened flywheel will not provide any more power, but it will allow you to accelerate more quickly.
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