Where can I find Ignition maps for the RB20?

[cachanilla86]

I'm going to use Mega Squirt on my car, but I can't find any timing maps for this engine...where can I fin them?

Thanks everybody...and sorry for my bad english.

[SamuraiSam]

You find them on the dyno. Put the cells you will access in cranking to stock timing numbers (look in your FSM), ie, the really low load and low rpm numbers. Remember that ignition timing generally increases with engine speed and decreases with load, especially peak cylinder pressure, as you build your basemap. Pay attention to where similar setups make peak torque, and build your basemap accordingly.

Good luck using any stock Nissan CA/RB or SR cam angle sensor without some serious homework and modification...
Modified by SamuraiSam at 7:24 AM 3/10/2009

[cachanilla86]

Good luck using any stock Nissan CA/RB or SR cam angle sensor without some serious homework and modification...

Modified by SamuraiSam at 7:24 AM 3/10/2009

I'm not going to use the CAS, im going with Ford EDIS-6...but friend is going to do all the tuning, so he asked for the ignition table/map for the RB20. And we dont have a Dyno here in Mexicali.

[SamuraiSam]

No dyno? You will not be able to have a properly running car.

[PorkChopExpress]

actually get the mega squirt, come back and i will post up some pics of the fuel and timing maps

[cachanilla86]

actually get the mega squirt, come back and i will post up some pics of the fuel and timing maps

I know there is very little information about the megasquirt install on RB engines, so I'm documenting everything I can.

[cachanilla86]

This is what I have in my hands right now:



And the EDIS-6. The Mega Squirt is a V 3.0, ready to use with EDIS. I dont really know if the relay board will work with the 3.0 MS

My project started 1 month ago, when i bought the rear 5 lug conversion from a wrecked Z32. I don't even have the S13!! Only parts, and a RB20 that was torn apart... I HAVE A DREAM!!

(Z32 VLSD+ wheels + brake rotors + RB20 intake manifold and other parts)

[PorkChopExpress]

oh you already have it.

[cachanilla86]

PorkChopExpress: THANK YOU, now...my friend wants to know what the X axis is measuring.

He is using MS on a VG33 300ZX (Z31), T4 turbo but stock distributor ignition, the car runs surprisingly good...it was tuned without a Dyno

[PorkChopExpress]

ill be honest with ya man, if he doesnt know what the load scale is and how its calculated i wouldnt have him tune your car.

i dont care what his previous accomplishments were.

[cachanilla86]

ill be honest with ya man, if he doesnt know what the load scale is and how its calculated i wouldnt have him tune your car.

i dont care what his previous accomplishments were.

this guy is not super fine tuning the car, he's just going to set up the megasquirt, and the x-axis in megasquirt is in kPa (wich represents engine load), he has never used nistune so he doesnt know how is managed in that system (he's assuming maf voltage to bits or something), he wants to interpolate and use an aproximate of the spark timing in kpa because we're not going to use a MAF sensor

[SamuraiSam]

Ignition timing should be the last thing on this guy's mind as he's setting up a basemap. As I said earlier, all you need is for about 1/10th of the map to be close to correct (low load and cranking areas). Nailing the 'required fuel' number is much more important (and damn near impossible.) Megasquirt's "VE" table is not actually a representation of volumetric efficiency. You will find out why as you work into positive pressure. See what happens with your 130% VE at moderate boost.

Are you using an internal MAP or an externally wired MAP?