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Overboosting Stock Computer?

Drift Freak

By Drift Freak,
in Engines & Forced Induction

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Drift Freak Collaborator

Drift Freak

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Hi guys, the other day i put a HKS 2540 on my RB20 R32 and got it going :) I haven't got the wastegate connected so it boosts of its head :D When she gets to about 13-14 psi it coughs and splutters bad like its got a boost cut??? my question is does the standard computer have a boost cut or something of the like? God i can't wait till my Power FC turns up :D And also the new HKS turbo doesn't have a wastegate line fitting on the compressor housing like the standard turbo where should i connect my new wastegate pressure line?? Any help is greatly appreciated :)

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BHDave Grand Master

BHDave

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The standard computer does not have a boost cut and you dont want to get your wastegate signal from the same point as the bov or boost gauge signal.

You need to take the wastegate signal from before the throttle body, not after, the closer to the compressor outlet the better. Get a nipple brazed into the compressor outlet pipe.

I'd suggest that the missfire is due to slightly rich mixtures, 15 year old coils, and plugs (and gaps) not suited to the level of boost you are running.

Drift Freak Collaborator

Drift Freak

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Cheers guys, I tried what RB SANDY said and disconnected the blow-off valve, works well by allowing the extra pressure to escape.

BHDAVE thanks mate you confirmed what i was thinking, i need to remove the compressor housing and either tap a thread for the nipple or get one braised on. Cheers guys your input is much appreciated :)

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