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Originally Posted by serialk11r
Okay so I didn't see anyone talking about these, but I think these are good places to pick up efficiency. Low boost turbos tend to have ****tier backpressure under cruise, if you can get an electronically actuated wastegate for them that would help. I imagine in the real world you only relieve a small amount of pressure but you have a large displacement engine so a small amount of pressure adds up to a lot of loss.
If I'm not mistaken the LS1 has "single cams" (1 for each cylinder bank with exhaust and intake lobes on it)? In that case retarding the cam doesn't work since that would increase the overlap and interfere with combustion stability. You might want to look into a regrind that cuts off a little of the overlap but maintains the same intake closure. If possible having the intake valves close even later is "ideal" in some sense, probably increases your top end power too.
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I'll talk to my tuner about opening the wastegate electronically under cruise. I suspect my backpressure however is way lower than most so not sure if there will be much gain. I have full race 4 into 1 headers with merge 3" collectors going into twin 3" mandrill bent stainless pipes that have no sharp bends, that then via a smooth collector step down to a single 3" pipe to pick up velocity and into the turbo at the back. The only backpressure will be getting gas through the turbo opening itself and out the turbine.... turbos offer little resistance and will even flow enough to run if seized. Likewise the intake coming back has no sharp bends and steps up to maintain flow.
re Cam. Single cam OHV. Cam has negative 6 degrees overlap so there is no overlap. Picked up 50hp at the wheels with it so unlikely to improve it any further there. I think the big gains now will be better injectors perhaps helped by more ignition. After that it'll be small incremental things with diminishing returns I suspect.
re getting a bike - lol. Crotch rockets are cool, however although I am an organ donor I'm not ready to lose any yet. Have you seen Kiwi drivers? Bike riders are high risk around here.
If I needed to save money I'd buy a hybrid. This is about chasing power and efficiency for fun not a question of whether I can afford the gas. I don't even look at the gas pump price, I'm only interested in how much I put in the tank
