RVR Base Ignition Timing

[MDK87]

Hi lads,

My RVR HSG Auto is sitting at around 2deg BTDC with the timing check connector grounded with ~750RPM @ operating temp and no load in neutral.

These don't have an adjustable C.A.S like the 6 bolt engines. How can I correct the base timing?

I've adjusted the closed position TPS value to ~0.5V as I do with VR4's.. - Is this correct?

Reading through some old posts, Rob (EVO00X) mentions the need to ground a pin in the OBD port when setting the idle speed via the BISS. I know that we must do this with VR4's as well, but I never noticed a difference grounding it vs not grounding on GVR4's anyway. Out of interest, what does it do?
And does anyone know which pin in the RVR OBD port this is?

Lastly, does anyone have factory schematics or ECU pinouts for this car?

Thanks in advance.

 

[4piknup]

You cant set the biss screw without knowing the isc position. You need the position as the position changes when you move the screw. Ie, if you screw the biss in, the position climbs and visavis. You need the position correct, so it has enough adjustment range for every situation. (I think you adjust it to position 30?, thats like saying 30% open.) Also, the ecu has programmed in say position 5 for hot start, or position 70 for winter morning. If the 30 setting is wrong it offsets all the other start points also. Also, the isc may be bottoming out or topping out too often, I think this is bad for the coils (inside the isc) long term.

Idk about adjusting base timing. You sort of cant do anything.

 

[vr401]

Couldn't you use evoscan option?

 

[4piknup]

Pinouts are similar to evo 1-3. Except maybe fuel pump or something.
there is a few write ups on here about rvr wiring.

 

[White Knight]

Fuel pump and solenoid.... 8 and 33 from memory.
Just sent you a text Mo, but that head has been off in the last 2 years and Mike was messed around a bit with it when it was put back together....

 

[4piknup]

Better check the cam timing then, and also maybe the balancer has shifted on the rubber.

 

[MDK87]

Ahh ok, so it sets the ISC to a default position.. Cool that makes sense, cheers Jack.
I'll just ground it at the ECU if I have to. Is it the 'airflow reset' wire?

All four coils in the ISC tested out ok at ~36ohms.
The first thing I did was verify that the cam timing was correct. Which in turn I guess means that the balancer hasn't shifted.

Looks like I'll have to get Evoscan Mio. I've also got some serious pinging on low RPM + medium-high load. So I should be able to see if the knock sensor is doing anything. So base ign timing can be adjusted through Evoscan?

Ian, so all the pinouts are the same as Evo 3 except that pins 8 and 33 are switched? I tried searching for this info but I couldn't find anything solid.

Thanks for your help guys.

 

[4piknup]

There is nothing to ground. You log isc position and adjust biss till isc position is 30.
more info here:
https://www.ecmtuning.com/wiki/idlesurge

 

[4piknup]

The outer ring on the balancer can slip on the inner.
if you are sure the cams are correct, line them up and see where the balancer points.
Because the cams would have been aligned with the mark on the crank gear without the balancer installed

 

[MDK87]

There is nothing to ground. You log isc position and adjust biss till isc position is 30.
more info here:
https://www.ecmtuning.com/wiki/idlesurge

I don't have ECMlink so I can't tell where the ISC is. I thought the service manual instructed grounding of a wire when setting BISS, that's all.

The outer ring on the balancer can slip on the inner.
if you are sure the cams are correct, line them up and see where the balancer points.
Because the cams would have been aligned with the mark on the crank gear without the balancer installed

Yes, I aligned the cams and checked that the mark on the outer ring of the balancer lined up with the TDC mark on the plastic cover, and it did so I'm guessing it hasn't shifted. There are specs on a label under the bonnet for base ign timing.. but there is no way of adjusting it.. Kinda stupid. :S

 

[vr401]

You have option in evoscan to adjust base idle.
Also, you can log ISC with evoscan.

 

[4piknup]

I dont know any other way to set biss. The factory use a machine.
im pretty sure evoscan will give you isc position.
It does make a difference when they are set. Certainly to idle up and hot/cold starts.

 

[xjokux]

Biss screw is usually in the middle. If you cant read isc value, adjust till idle is still at base rpm

Thats what ive noticed when tuning with ecmlink. Most things will relate with each other. Just make sure tps and throttle cable are set right and no leaks