Juddering

[Gary Anderson]

Hi guys needing some advice on what this could be I will also post the spec of the car in the post along with as much as I know as I haven’t owned the car more than a week.

ok so bought this car a few nights ago knowing there was a issuewith the gearbox 5th gear is knackered(you need to hold it in place or it crunches) but the guy gave me a spare gearbox and told me the one on it was a lsd box.

anyway so after having the new fuel line fixed from sos motorsport in Falkirk as it spilt as I was coming home from buying the car I noticed something strange while on boost

so what seemsto be happening once I am around 4/5k rpm on full boost it feels like the boost is on one min then off then back on again consistently I am
Not getting a smooth progressive delivery off power and I have even tried this with changing the settings on the apexi avcr to a/b still the same could anyone point me in the right direction to what it could be?
On the attach ment it has the spec list of the car

[Sam44]

Hi.

Sounds like fuel cut (over boost conditions) and around the point the td04 makes full boost pressure. 

First I'd remove the spark plugs and check they all look the same none blackened or damp with fuel. Then check your waste gate/boost pressure regulator system & intercooler system. 

Nice spec list. 

Edited May 26, 2020 by Sam44