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Rb25 Cas Problem?

modb

By modb,
in Engines & Forced Induction

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modb Rookie

modb

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It's not stock haha it has pistons, rod bolts, head studs, as of yesterday it has a cosworth head gasket, 750cc injectors, Greddy intake, Borgwarner 7670 1.22AR, Nistune, top mount manifold and lots of other goodies. But I guess what I'm wondering is whats the proper way to set the base timing with the RB25det S2 TPS, that has the idle switch built in.

Ben C34 Grand Master

Ben C34

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I always thought that ben but I did a car the other day (conpletely standard R33 RB25 with standard manual ECU) and with TPS unplugged it was fluctuating 4-5degrees on idle. Any idea on why?

What was it idling at?

modb Rookie

modb

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Its an RB25det swapped into an R32 running an RB20 harness and ECU with NISTune, and when I unplug the brown bottom plug on my TPS the idle jumps up 500RPM. And as i said it was an RB25 S2 TPS with the idle switch built in.

17221921073_8587b9442e_z.jpg

And when i use my timing light on it it has the CAS almost fully advanced to get the 15deg. The car also idles at 1000-1200RPM and when i unplug the TPS it jumps to 1500-2000RPM as well.

Edited by modb

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