Thread: Timing Maps for Tuning

has anybody checked realtime with a timing light at full boost and see what you are actually running. these timing maps are peaking real high for turbo cars. either one the base is way off or the cars are pinging like pistons falling out. when your at peak load the cars are at 30 degrees timing under boost.

Even for an 8.5cr motor?

With my last tune (Vadim's Tune V1 - 7 PSI), I seemed to have no audible knock or any issues.

this map has 28 degrees of timing at 5 psi dont you think its a tad too much. The only time I see this is if the car mechanically is not synced to the ecu. A stock sr20det map has 8 to 11 degrees in that area. Bump it up a few degrees for some more power maybe not 18 degrees.

supercowboy, are you comparing the stock DET ignition map at 65 TP? Because 65 TP on the stock map may not correlate to 5 psi depending on the MAF used, and the K-value used. Frankly, trying to compare these TP maps with one another is just about useless unless you know you're using the same TP scale, K-value, and MAF.

I'm starting to wonder how useful it is to even post them on the forum.

However running 28 degrees of timing at 135 kPa (5 psi) seems well within the realm of the norm for a 8.5:1 SR20DET engine with restrictive stock cams/valves.
And the other map that has 22 degrees at 170 kPa (10 psi) is right there too in my opinion.
Maybe you're not used to dealing with such low pressures on such crappy flowing engines?

I need to post up my current ignition map once I'm confident with it. You might like it better. It has 13 degrees at 170 kPa (10 psi) right now.
But I have a 9.5:1 SR20DE+T with the low port head/intake and a '91 cam so maybe that's closer to what you're used to seeing?

I can only confirm the "unattributed GT3076R DET Tune" AEM ignition map was checked with a timing light for accuracy at idle and there's no reason to believe it would be off anywhere else since anything to pull timing was disabled and it's not like AEM is known for significant ignition timing jitters or wavering at high load or rpm.

Check out Calum's map though, but I don't have TP to boost relations on that map, so it's as good as useless as Ben said.

In reality though, your never really in any of those area of the map. The only way to constantly be in the 5psi column is by finding the right gear and pressing the gas perfectly without forcing it to run over to the next column.

Now I did use Ethalapy's guide for base, then built upon it. I need a real knock light though.

I did verify my timing with my timing light too, 15*. Unless my timing light is whack. But It seems to be showing accurately with other SR20's that used it on.



I believe he is looking at the PSI correlation to the TP and column. If I could datalog the Pressure, it would make this a much easier process.

But your right Ben, maps with no boost relation are useless since TP is an ever changing number for every setup. As long as we modify the K value our TP values will never be accurate. Now Tunercode goes away from touching K values, thus Tunercode users should start having similar TP relations to boost pressure.

Once I get my setup running I'll start posting those timing maps, which would be far more helpful imo.



Which reminds me, I will need to use a basemap on my new setup (O2 induction mani and external gated).

I see what he's saying. Calum has 15-17 degrees at torque peak (5,200 - 5,600 rpm) and 69 TP whereas you have 28 degrees at torgue peak and 65 TP. That's a huge difference. But the problem is, 65 TP on one of these maps has almost no relation to 65 (or 69) TP on another map because of how the different MAFs and K-values fuck with TP.

That's no excuse. The area should be tuned properly even if you don't spend more than split seconds there on your way through it. It's not even hard to do. Well, maybe on the TP maps it is. (Is it hard to tell I despise TP?)

I've currently been reworking my timing map as well to try to improve my gas efficiency while cruising and a few other places. I agree that ditching TP for say a boost scale would be a metric shit ton easier. I am super interested in TunerCode to see how that will help. Most definitely will be a future purchase of mine!

Yup I know it's no excuse, but I've had no audible knock to worry about it. But with new flow mods I will definitely look into using the lighter version of Ethalapy's timing.



Once TunerCode supports a MAP yup, but Dave said it's up to the tuner to decide what the voltages translate to still. So what I'm getting is, even with a MAP we might not be so fine and dandy as we hope.

What Dave said is it will be up to the program side to determine the map sensor correlation!

Which means that I can have a drop down menu in NismoTronic for the end user to select the current map sensor that he is using and it will create the appropriate boost reading given the current map sensor voltage.

So it will simply come down to selecting your map sensor in the program and it will automatically scale it for you. Can't get any easier than that!

It will be a direct translation to the ECU right? No need to go through a bunch of calculations?

I would be fine with using MAF's and if we could get a direct translation of 4.5v = 10 psi of boost for say a z32 MAF. But I understand that need for calculation values too.