Mr DOHC
New Member
hey all, I need some help. This may be a bit wordy so excuse me if this doesn't make much sense.
I have myself a VP ute with a mild 355 and auto, it was built as a torquey streeter, never a race car. But it is just not as fast as I believe it should be even with the basic mods it has:
355
10:1
284 cam with YT rollers
HSV headers, HSV twin 2.25" dumped before the diff (y piece after headers is only 2.25")
215i injectors
Kalmaker
Stock auto with corvette servo
I took it to the track and without stalling it up (starts to spin at 1600) I left from idle and ran 14.88 @90 on a 31 degree day.
The car feels almost as quick overtaking at 1/2 throttle as it does at full throttle.
Tuning issue:
I've tuned it as it was a dead-set daily and tuned mildly. I cannot give more than 20 degrees timing above 3600 rpm without it detonating and reducing power significantly. This doesn't sit well with me as this is a massive drop from what I have been told it should/could run. Or is it the cam/355/stock manifold creating such big cylinder pressure, combined with the shitty headers at 3600-4400 and it just causing it to choke?
I don't have cash to just throw at a car at the moment to hope it fixes ****. If I can get an idea as to what any of you guys think it might be so I can have something to look at
I have myself a VP ute with a mild 355 and auto, it was built as a torquey streeter, never a race car. But it is just not as fast as I believe it should be even with the basic mods it has:
355
10:1
284 cam with YT rollers
HSV headers, HSV twin 2.25" dumped before the diff (y piece after headers is only 2.25")
215i injectors
Kalmaker
Stock auto with corvette servo
I took it to the track and without stalling it up (starts to spin at 1600) I left from idle and ran 14.88 @90 on a 31 degree day.
The car feels almost as quick overtaking at 1/2 throttle as it does at full throttle.
Tuning issue:
I've tuned it as it was a dead-set daily and tuned mildly. I cannot give more than 20 degrees timing above 3600 rpm without it detonating and reducing power significantly. This doesn't sit well with me as this is a massive drop from what I have been told it should/could run. Or is it the cam/355/stock manifold creating such big cylinder pressure, combined with the shitty headers at 3600-4400 and it just causing it to choke?
I don't have cash to just throw at a car at the moment to hope it fixes ****. If I can get an idea as to what any of you guys think it might be so I can have something to look at