Quote:
Originally Posted by Chrysler kid
It really depends on driving style. If this is a long commuter all highway miles very few stops he would see more benefit from the taller gearing and steelies with disc covers
If this is a mixed city and highway driving there really is not much point. City driving you would want shorter gears and the light weight wheels from a hx or vx to require less effort to accelerate.
With my d15b s40 lsd trans on my hx this winter I'm getting 36.8 mpg all city driving. Lean burn kicks in at 52mph and with 45mph speed limits I can usually hit a clean lean burn atleast once on my trips for a few minutes
There is also a thread back in the depths of this forum where a hx member did install a vx trans into his car, I believe he was hoping to turn 2k rpms at 60mph similar to a vx model but noticed he was still turning close to 2200 rpms. He concluded that the trans swap which he intended as an upgrade was more work than it was worth and didn't really net him any benefit.
Lean burn is rpm and speed sensitive on the hx ecu. It only engages in final gear during certain conditions above 2300 rpm or 55mph-78mph. There was also a member who did install a few resistors into his vss sensor to trick the ecu but again I don't recall him updating his posts or fuel log after that
Now if his factory lx trans is on the way out then I would say yes to swap them but he hasn't mentioned that
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You make some good points.
My DX trans is fine, ISB is nice and tight and the trans is very quiet.
I did not know that the lean burn factored in speeds. I have read the opposite but it really seems to be quite the mixed bag of theories.
I will have MPGUINO + Ultra gauge. I will keep a close eye on things and come up with my own theory on what parameters the ecu likes to get into lean burn.
I do not drive a lot of highway on my daily commute, a short stretch here and there so a really tall FD would probably be more frustration than it's worth at this point.
Who knows, I may do this whole swap and see zero improvement.
We shall see.