06-23-2010, 05:32 PM
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#13 (permalink)
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A True Z Fanatic
Join Date: May 2010
Location: SLC, UT
Posts: 1,671
Drives: '08 Evo X | '10 370Z
Rep Power: 20
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Quote:
Originally Posted by Jordo!
Yes -- without question, FI will reduce the overall longevity of the engine (i.e., substantially greater cylinder pressure creates considerable additional stress on the entire motor -- especially rods, crank, and pistons).
On the other hand, with a bad tune, detonation and preignition can kill the motor in seconds.
Now will FI, even with a "perfect" tune, reduce longevity by 100K miles or 300K miles? That appears to be unknown.
Has anyone found something resembling the upper limits of what the motor will tolerate before breaking due to overpower -- as in, will break something even with a seemingly knock free tune?
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Well even with a really good tune, fuel starvation can kill an engine in seconds. The stock fuel system sump design (ignoring having upgraded pumps, lines, etc) is not capable of fueling a car making 2x stock power. You really need a fuel accumulator or revamped fuel pickup design to safely run a ton of power over stock. I've yet to encounter any budget sports car that had such a fuel system design stock.
Evo's have this issue... my project car before that had the very same issue. I'm sure the 370Z is no exception. In fact, unexpected fuel starvation has always been the biggest engine killer I've come across while tuning turbo cars.
Uphill onramp + 0.7+ g's of acceleration = fuel starvation. Not to mention power under cornering on a road course.
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