B951S

I have been trying to get an understanding of what timing map to use in my Link 2 stand alone. The link requires discrete values in a load x rpm table as opposed to using a simple base timing + retard as a function of boost. Having read other posts about this, and looked at how the stock DME uses full throttle, idle and part throttle maps (8% to 55%) TPS, I have attempted to ‘copy’ the stock values a starting point.

I assumed that the stock non S map I looked at peaked at 12psi in the midrange and then tapered off to 8 psi at redline. The WOT timing values were then put in the correct load/rpm value on the link sheet. Less easy to covert were the TPS dependent timing values from 0-55% TPS as they don’t relate to a given manifold pressure. I then extended the trend down the load axis.

Anyway, the result was a map that pulled timing back to the 20’s at high boost / high RPM, and shows big advance in the light throttle (vaccum) high RPM loads. The stock program has as much as 39 degrees from 4-6,000 rpm at up to 40% throttle.

Does this look like a reasonable map?? I wonder how it stacks up against a guru chipset.

B951S

Let me put it another way, is the stock timing a good model to follow??
Travis, any input for me here??
Cheers

NZ951

I could not be more interestyed in this! B1951S, was my timing map I gave you far off?

superjet.1

dont use the stock timing it does not have enough retard in critical areas.I can get you a timing plot give me a few days to sort threw all my emais or call me.

NZ951

That would be great superjet!

B951S

superjet, you got a deal!! I think there is a few of us Link guys who would really appreciate this. Maybe you can post it so we can all get it and discuss it. This forum rocks

BoostGuy951

I would appreciate if you could post it on here, Travis. I would like to have a look at it as well.

B951S

After getting some advice and turboS maps from Danno, here is a S map translated onto a Link worksheet with the hiigher load zones extrapolated. From my reasearch, you need to dial in a 5degree valley at just around when the boost hits to keep the knock sensor from kicking in.

NZ951

Any luck on those timing values yet superjet?

NZ951

Calling Superjet!

BoostGuy951

B951S-

Are you running any Mechanical Timing Advance? Also, could you get a screen shot of the values and not just the graph. I would like to copy the chart value for value.

NZ951

True that BoostGuy. I still have the stock link values. I imagine they are safe but could do better. I dont really know how to tune timing...

Danno

Hey B951S, that looks pretty good! You might be able to scale up the ignition with RPM as well. Can't quite see actual ignition values of the high-load zone clearly, but I've noticed you can push it up to about 18-degrees there which comes to about 20psi?

Also remember that these numbers are offsets from base-timing. Due to the adaptor-board for the stock-triggers on the flywheel, base-timing is actually not zero-degrees TDC. There's a calculation you can make based upon the 4-position binary switch that comes up with some number you multiply the 5 to use an offset from the reference sensor mark of 58.4-degrees. So you end up setting base-timing to 3.4-degrees BTDC or 1.6-degrees ATDC, but not absolute zero. Then your tables are degrees away from this mark itself.

porshhhh951

danno!!!!!! damn have i ever missed you!@#$ sorry dont mean to sound gay.......man its good to have you back posting again

B951S

Dan
My understanding is The link 2 has a static timing value to look after the mechnical offset so the numbers in the table are absolute. Here is my latest after studying the more aggressive ROW midrage timing