I know it is a huge amount, as evidenced by I30tMikeD's dyno numbers, but does anyone know actual figures? I would like to use JWTs figures as a measuring stick to help figure out how much I should pull. Even though JWT's timing retard is obviously severe overkill.

I've got my car back on the road, tuned a roughAFR from idle to redline up to 15psi, from 11.2 to 11.8 across the board. I'm going to do some more fine tuning this week and get her to around 11.5 across the whole range.

I've begun to think I'm pulling more timing that necessary. I've talked to a couple very knowledgable (but non maxima) people and showed them the graph in the all motor forum of the stock ECU timing advance and they said "holy crap your car runs so little advance." I'm beginning to think the 7 degrees I'm pulling at 12psi, and the 8 degress im pulling at 14psi is excessive. That's what these other folks that I talked to though as well, given that the VQ30 runs so little advance anyways. Based on that graph it shows timing to be as little advanced as 13 degrees from 3600-4000rpm, right in my prime spool zone. Minus 7-8 degrees which I'm pulling, and I've only got like 5-6 degrees of total advance in that area.

Any opinions on this?

Here is the graph of stock timing. The orange line is stock ECU.

 

Since its getting a lot cooler up here, you might be able to not pull as much, but go back to pulling more timing when its warm.

 

Neal,
This will probably be the typical not-wanted answer, but oh well - here are the two things I would suggest:

1. If you really want to know definite timing in boost and higher rpm's, put it on a load bearing dyno (such as dyno dynamics) and set it to maintain a set rpm and boost, or just turn accelleration to very slow and pull the top end and check it mechanically - timing light.
Problem is, knowing the advance is not going to do anything for you. If it's at 5 or 55, this means nothing even when you want to play the "comparison" game.
2. If you want to really do something with timing, again a load bearing dyno is your best bet. I can't remember if the maxima emanage setup will allow you to advance timing, but atleast you have retard and less retard to adjust. Tune it by torque for MBT, but keep knock-limiting in mind if you are on pumpgas depending on boost etc!
*If you really want to make the power, and safely, and not worry about knock limiting... fill it with C16 and you now you can tune for MBT, as I don't see anyway for it to be knock limited before best torque. You could even turn the boost up some

By dyno tuning ignition, you can gain safety and power. Getting the ignition advanced to optimum, the engine will be happier running - and of course make more power

My last concern is emanage being a piggyback. I'd keep a close eye on variables changing the ecu advance. You wouldn't want the computer to be advancing one thing on the dyno, and change later because of modifiers (such as intake temp, coolant temp etc? not sure what all the stock ecu references for timing modifiers)

Hope this helps.


PS. I had one other concern I want to run by you sometime regarding the nitrous setup on that car! I've got to run right now, but I'll call/im/pm you later regarding it

 

Data from my JWT ECU, **** poor advance.

4250 8
4575 10
4963 10
5325 10
5675 10
5975 10
6263 10
6475 10
6725 10

 

Hmm I wonder how long it took to make that map.

 

well the magic number looks like 10 so i will say 10 minutes.

 

Good info, thanks Matt.