Rb25 Cas Problem?

[modb]

So recently I've built my rb25, but it feels sluggish, I've noticed that the CAS is almost to one side and i always thought they were supposed to be in the middle. Can anyone tell me what causes the CAS to to not be centered i guess?

[KiwiRS4T]

If you think the timing is wrong put a timing light on it. Is it a stock rebuild ( stock ecu etc)?

[modb]

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.

[hardsteppa]

Changes to exhaust cam, eg via adjustable gear, will have it off centre.

[modb]

It has the stock exhaust and intake cam

[Ben C34]

We should stop guessing then untill you decide to provide as much info as possible.

[Ben C34]

As for how to set timing, disconnect tps at idle locks timing to 15. Use a lead between plug one and coil.

How have you done it? Was it tuned the way it is?

Why do you care?

[iruvyouskyrine]

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?

[Ben C34]

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?

[iruvyouskyrine]

700-900rpm

[AngryRB]

Yeah should be in middle... maybe its a bandaid fix for somthing

Edited August 10, 2015 by AngryRB

[modb]

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.

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 August 10, 2015 by modb

[KiwiRS4T]

The position of the CAS is not really important if the timing is right. Ask your tuner (you did get it tuned when you fitted the Nistune????).