LS4 / F40 swap - fieroguru (Page 203/203)
fieroguru NOV 17, 10:02 PM
Another weekend of some WOT runs!

I wanted to do a WOT run in 1st, 2nd and 3rd so I could compare them.

1st gear is pretty much wheel spin city. If I floor it, wheels spin, and I hit the rev limiter. Peak boost was 6 psi.
2nd gear - if I floor it at 2000 rpm, the rear tires will fight for traction but they hold - peak boost was 7.3 psi. If I floor it in the 3K to 4K range, wheel spin city. The road had a pretty good crown, so once the tires lit up, the rear started to creep to the right side.
3rd gear - hammer down, tires hold, and you rocket to 120+ mph.

Now granted, the tires are 8 years old and past their prime. It also was about 65 degrees, so cooler than the tires really would like. I am planning to buy some new tires next spring.

The E40 has a table where I can slow the opening rate by gear, but not sure it will be enough. This car really needs some kid of boost by gear and/or traction control (or awd).

Also learned that if I press the clutch right before the 7300 rpm rev limited, the engine will overshoot the 7300 rev limit.

Peak RPM: 7560
Peak Boost: 8.0
Peak TQ: 608
Peak HP: 768

There wasn't much of a difference between the power curves between 2nd and 3rd gears.



As we head into winter, I have a rather significant upgrade for the car - probably in the January time frame.
https://www.haltech.com/pro...bel-ls-suits-gen-iv/


While on the HRPT this year, I spent some time talking with a sales rep at Haltech. They impressed me with all the built in features (wideband closed loop, boost control, boost by gear, traction control, flex fuel, cruise control, etc. I picked up the Rebel LS and harness several months back, but wanted to fully vet the E40 before going aftermarket.

FieroWannaBe NOV 20, 06:42 PM
I recently acquired the same unit.
Let me know what you figure outnas far as the VSS. They limit the number of teeth to 50.
I think the pulses per mile input will still work though.
I also hope you are able to set the timing offset with the LS4 timing cover. (I will be using the an LS7 cover).
fieroguru NOV 20, 08:12 PM

quote
Originally posted by FieroWannaBe:

I recently acquired the same unit.
Let me know what you figure outnas far as the VSS. They limit the number of teeth to 50.
I think the pulses per mile input will still work though.
I also hope you are able to set the timing offset with the LS4 timing cover. (I will be using the an LS7 cover).



Good to hear others are taking the plunge as well.

I was planning to add a reluctor ring to one of the front wheels, so I can do the same for the rear. I wanted the front one to enable traction control, but haven't looked too deep into it to know if it will work with just 1 input from each end of the car.

I switched from the LS4 timing cover to the LS2 one with the last round of upgrades, so no concerns with that.

[This message has been edited by fieroguru (edited 11-20-2024).]