Gt HP boost Options

[devilsden97]

Whats the best bang for your buck, to increase your hp in a 5S-FE motor?(totally stock) How much HP upgrade should i be looking at? (with whatever your suggestion is.) And does putting Super or Premium gass really effect hp enough for it to matter?

[Boss-Celica]

Ok first off I'm a friend of this guy's SN. I have done many swaps and also rebuilds of motors and it takes more then bolt ons to build a good motor. First off the power doesnt come just from pistons its also the head, You can mill the head to increase compression, Then you can port out the intake port (DO not polish! this decreases the chances that your fuel will atomise with your air to form a good mixture) Then lighten up the head, put ferrea valves and stiffer valve springs and lighter valve retainers, nowadays a good machine shop can make you a set. Polish your exhaust ports and port them too, to increase exhaust exit airflow. You also need to tune the camshafts to have a good duration so your valves are open enough to shoot enough air. Then balance your crank, the 5sfe crank is pretty weak because it wasn't balanced (it has a freaking harmonic balancer because of this) as good as it should have been, knife edge that crank too to help reduce drag in the oilpan. all you guys that have turbo and say that an NA 5sfe is worthless don't know crap! try rebuilding a motor and get into all the smaller engineering details that'll free HP up, just the head alone can be made to flow as good as a 3s head, also for the record a 3s head bolts onto the 5s and lowers the comrpession all you need is the head, 3s belt tensioner, 3s oilpump, and 3s headgasket but it needs to be modified for the 5s coolant ports using a drill and file. Watch for my company coming out with parts for the 94-99 celica soon and watch our progress on the 5sfe and 5sge and you'll be shutting your mouths.