SR20DE Block with Neo VVL head and acceleration issues

[NiCoXis]

I just registered to the forum, and I’d like to start by asking for some help 🙂

I have a Nissan Primera (also known as Infiniti G20). Originally it had a standard SR20DE but I’ve done couple of mods to it, Neo VVL head swap, high performance 4-2-1 extractor, Fujitsubo High flow exhaust and a JWT Pop charger.

Bellow are some pictures of the head swap process, which my mechanic did.

My issue is that acceleration acts weird, specially when cold. Just pushing gently on the gas pedal it starts accelerating and then it decelerates (no matter if I push it further down).

The problem is reduced when the engine gains temperature (harder to notice), and it only seems to disappears when going WOT.

I’ve looked for vacuum issues but found nothing. I’m thinking it may be a problem with my injectors being dirty or not mounted correctly, but that’s just guessing on my part (I’m a car newbie).

Any ideas on what

Topic

[EricTheCarGuy]

Thanks for the update. I don’t have a lot of experience with those clutch kits however they usually have pretty stout pressure plates which can be hard on the clutch hydraulics. Also keep in mind that your drivetrain may suffer from the increased power you’re running through it. Welcome to the world of performance and an empty wallet, have fun doing it though.

[NiCoXis]

haha looks like a no turning back point 😀 Actually I’ve learned A LOT through this project, in the end experience is where you get the most from.

Thanks for the advice!

[Author]

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