Discussion
Have come across this "simple" conversion for LS engines to retrofit variable valve timing http://www.hotrod.com/how-to/engine/hrdp-1007-gms-.... Looks like it could be an interesting mod to help with drivability on higher power specced cams.
What are peoples thoughts on it?
What are peoples thoughts on it?
R8VXF said:
I don't know tbh, this is my first V8 and haven't modified it yet. Was hoping for some collective wisdom
I do drive my car round town a lot so really need the low speed to be nice but would like big top end numbers.
I've just had the AFM (displacement on demand) bits stripped out of our engine, and replaced with conventional parts. Not quite the same, but when you think that an LS3 red lines at 6500revs, yet an L76 redlines at 6k revs, then GM obviously thought it was a weak spot.I do drive my car round town a lot so really need the low speed to be nice but would like big top end numbers.
Keep it simple.
KMud said:
I have bumped the spark about +10 degrees in the low airflow/low rpm regions of the spark tables and it really beefed up my low end, possibly too much. I may dial it back a little. VVT would be lovely, but...
you on cable or electronic tb? it did seem very weak timing low down but I suppose it helps keepin itt smooth if you have an etc try mapping the ram rates but dont go silly and never set any of it to 100%R8VXF said:
I don't know tbh, this is my first V8 and haven't modified it yet. Was hoping for some collective wisdom
I do drive my car round town a lot so really need the low speed to be nice but would like big top end numbers.
Just chuck it at WP and let them sort it.I do drive my car round town a lot so really need the low speed to be nice but would like big top end numbers.
I am very happy with the result.
stigmundfreud said:
you on cable or electronic tb? it did seem very weak timing low down but I suppose it helps keepin itt smooth if you have an etc try mapping the ram rates but dont go silly and never set any of it to 100%
Cable. I'm not sure what point I was making...I guess just if it's weak around the idle area, it may be beefed up with spark unless it's already maxed out with a donkey dick cam. I'm not sure I lost much/any smoothness since that seems mostly related to transitions from base spark to the high/low octane tables, but it's more eager (straining at the leash). I am on LS1B where life is simple...If it's a big engine with a big cam, and we're talking more optimising power through the rev range I could see VVT being worthwhile.
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