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I'm trying to understand my timing map in my tune. This is all new to me, so I'm trying to pick this up as quickly as possible. So as I understand, if I subtract 14.7 from my map reading, (Psia) it will give me psi (boost pressure) . Is this correct? If so it looks like I'm at 23*@10 lbs boost? Is this too much timing? Cammed ly6/whipple 2.9. Car has ran fine, AFR is 13.5 idle , 12.2 -12.5 cruise, 11.0-10.8 @WOT . AITs are 20-30 over ambient. I recently added meth, and was trying to fig out what I could change to increase power. I'm also worried about being too fat@WOT for the meth. Below is a screen shot of my timing map.
What box is highlighted with the key on? That will tell you if you subtract 14.7# for atmospheric pressure. You need to read the plugs to see where your at.
What I can't understand is down the bottom it says base advance 14
Total advance 18 . So is it 18 or 23? I know it's a little rich, I was going to try to lean it out a little myself. I did mess with the idle a little , now it's 13.8-14.2 . Is there any way I could read the plugs on the street? Only been to the track a few time @ street nite. Not sure if I can pull over after a run and swap plugs . Busy as hell there
You are in the 14* timing cell. It could be putting in 4* extra degrees to raise the rpm. The Rpm during that shot is 736. What is your commanded rpm?
It idles around 750-800 . Cam is 224/238 .578 .593 115 Lsa
Fuel is 93 e10. I'll have to look at commanded rpm. When I took that pic the Ac could have been on. I don't have it wired to raise rpm w/Ac on yet.
It idles around 750-800 . Cam is 224/238 .578 .593 115 Lsa
Fuel is 93 e10. I'll have to look at commanded rpm. When I took that pic the Ac could have been on. I don't have it wired to raise rpm w/Ac on yet.
If you are not on a dyno and can't see how the power changes with timing and you don't have knock sensors you need to learn how to read plugs. You could be knocking now and it could be hurting your power. 22-24* is on the high end of where you could end up. You don't need to be starting out your tune there.
That's what I was thinking . This is the tune mast sent me after I installed whipple. (It's their cam , etc) I haven't really messed with it except to lean it out @idle a little. It's got knock sensors etc.. it pulls timing w/ high IATs etc... at least it did when it was n/a. He told me the tune needed to be cleaned up I just haven't gotten around to it yet. I'll work on the AFRs and try to learn to read plugs or at least post some pics . the car weighs 4050 and traps 130 . It's been together for a year .I wanted to enjoy it for a while before messing with it, but it's time to get it dialed in
Well if you are using all their products I would hope they would be close on their tune.
If you can save the original tune you can always back it off some and work the timing back in until it is optimized. 10psi 130 trap at that weight is pretty good start. How much faster do you think you should be?
Well if you are using all their products I would hope they would be close on their tune.
If you can save the original tune you can always back it off some and work the timing back in until it is optimized. 10psi 130 trap at that weight is pretty good start. How much faster do you think you should be?
Not really sure . I guess i just wanted to lean it out a little so I would see some gains from the meth, and make sure I'm not leaving a lot on the table. I also wanted to add a couple lbs of boost
Mast is a disaster and there's plenty of horror stories in FL about them. Drop your timing to 10 degrees at WOT and low 11's AFR as stated and check knock and plugs. Then start adding timing until you see the plugs look reasonable.
05-24-2017, 06:33 PM
Help me decipher my timing map 
