hard studder on wot start around 44k

[shadow001dsm]

It has been a while since i posted here. (not sure if im in the right section anymore).

Heres the issue, under a wot pull the car will studder violently at around 4 to 5 k sometimes higher, its intermitent at what rpm it starts at. kind sounds like anti lag going off or a two step, i dont have a tune or a logging capabilities. mods are as follows.

exedy 2500
individual coil packs
front mount indercooler
evo III big 16g
blitz bov,(its venting to atmosphere, been like that for a long time and never had a problem till now).
fuel lab fpr (set to 40 lbs of fuel)>
no boost controller still stock boost
wally 255 lph
new head about 3k on it
no boost leaks
compression is fine

i think thats it please any and all info would be greatly appreiceiated.
If any one is in the phoenix AZ area your more than welcome to come look just send me a pm.

Forgot to metion that it wont boost past 5 psi,

 

['97 Cayenne]

do a boost leak test and check your plugs

 

[Diamond Star Werks]

Recheck your fuel pressure and your spark plug gaps. Check your plug wires as well for any bad spots. Try it with a cold car as well. Coils sometimes have issues when they get hot and not when cold.

 

[99gst_racer]

That studder is probably the crankshaft ejecting from the block if you're really spinning it to 44,000 RPMS (44K).

Could be a pig rich fuel spike. I've seen that on several other DSMs and it's usually right around 4000-4500 RPMs. It's going to be tough to determine without a way to datalog and/or monitor your AFRs.

 

[Diamond Star Werks]

That studder is probably the crankshaft ejecting from the block if you're really spinning it to 44,000 RPMS (44K).

Could be a pig rich fuel spike. I've seen that on several other DSMs and it's usually right around 4000-4500 RPMs. It's going to be tough to determine without a way to datalog and/or monitor your AFRs.

^Tis why I said to check fuel, pressure. I had mine too high before and it would still pull hard till it hit 4500 and it was, like a wall everytime at the same spot.

Lol @44k.

 

[98and01eclipse]

have you checked your turbo mine did that bosted to 8 max.
it stared to shurtter at 3500rmps and wouldnt go past 4500rpms
min blow a seal