Tunning issue or 4l60e going out??
Tunning issue or 4l60e going out?? i recently finished doing a small simple h/c/i in my 98 ls1 z28. 243 heads/ls6 cam all suporting bolt ons no stall.it is untuned.when the car was stock when i would floor it it would shift perfect.now that i did the h/c/i i took it to the track only to have my rev limiter bouncing.it shifts perfect under normal driving but when you floor it it does not shift..any ideas?
I know its h/c/i but its nothing big thats why i assume the tune is not that bad.
Any input is appriciated thanks in advance.
I know its h/c/i but its nothing big thats why i assume the tune is not that bad.
Any input is appriciated thanks in advance.
Moderator
Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
I cannot figure out why a cam change might cause you to hit the rev limiter, but any cam change certainly requires a re-tune.
There is still a chance that your trans is slipping, but start with the tune, perhaps asking the tuner to raise your transmission line pressure too.
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
Anytime you speed up the motor's acceleration the trans needs a larger window between the commanded shift and the actual shift and the rev limiter, especially the 2/3. I command mine around 6150 and it takes till 6450/6500 before it actually shifts, remember thats a tiny amount of time though. Results are the same with a stock trans or a built one.
Last edited by 01ssreda4; Sep 24, 2013 at 11:05 PM.
I am having the same problem as soon as I did my install took it to a tuner who is terrible but near my area all he tells me is that he can build me a granny this and that I'm buying a software probably hp tuners and I want to see for myself I dont see how a h/c/i swap could do this but I guess anything is possible. My car shifted fine then I change some motor parts and on the first drive I noticed it.
