Quote:
Originally Posted by toohighpsi
I can't see what a lash cap does on a stock system unless there is some amount of lost motion within the cam follower. With a smaller base circle cam it's completely understandable.
With a completely stock LT1 fuel system the most I was able to make was ~620 RWHP. It's important to note that I'm running at standard conditions on most days. I'm at 100 ft above sea level with a temp normally right about 65F, so there isn't really much of any dyno correction - the car is making the power that the dyno displays. When testing at higher altitudes you could get a higher RWHP number on stock parts but that would be because of the correction factor that is applied by the dyno to the data.
I'm now running the stock LT1 injectors in the Camaro with the Lingenfelter Big Bore HPDI fuel pump to the tune of 690 RWHP which is the point where the low pressure system was down to under 30PSI (didn't run out of fuel, but wasn't comfortable to go further). We are switching to the ZL1 in-tank pump right now and I'll get back on the dyno to see if the stock LT1 injectors will go 700 RWHP with the help of the ZL1 in tank and Lingenfelter big bore pump.
Now in my mind, I have a tough time recommending the LT4 pump, on my Z06 with TVS 2300 the LT4 fuel pump lost capacity at just over 650 RWHP (I thought that 700 would be in reach). With the cost of the LT4 pump at about $800 it seems like the best choice is to go right for the Lingenfelter Big Bore pump along with LT4 injectors as the injectors still had capacity left when the LT4 HPDI pump gave up the ghost. I'm thinking there is 750 RWHP capability with Big Bore pump and LT4 injectors on an otherwise stock engine (good fuel of course).
Lingenfelter has a really big set of injectors that they recently released, capable of over 1K HP if I remember correctly.
I am working on additional fueling for the Camaro beyond that point and will be happy to share as soon as I have some performance data on it.
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Looking forward to your thoughts and results on the ZL1 pump. I just put mine in.. not fun if you have big hands LOL..