are u sure bout this?

 

LOL no clue thats what I'm asking...advancing would have to give you some sort of gain I would "assume" since retarding the timing takes away power normally...BUT if we are talking about 1 or 2 hp then to me thats just not worth the effort or gas to drive up to the dealership then pay them however much they will charge to do this...but again lol for 5+ hp why not

 

bump

 

I definitely wouldn't advance my timing in socal with our sh!tty 91 octane...

 

i have two identical maps on my utec, i advanced the timing on one of them two degrees across the board. i too am interested in exactly what kinda hp gains this will have, i am going to the dyno again soon as i get my utec wideband next week... ill keep ya posted

 

Yes for sure I would only advance your timing if you can buy 93 octane.


I have played with the timing alot on the dyno and to tell you the truth, it only helps if you can really fully tune it. Bumping it on the consult will help it in some areas and it may not even be noticeable. I think it might help the fuel mileage a little. Someone at Nissan told me that the base timing on the ecu was set for 91 octane, so it was not uncommon for them to bump timing if ask by the customer in places where you can get 93. Once under load and in real driving situations the computer controls all the timing and it is not known what affect base timing has on it when it is actively controlling timing anyway. I can tell you just because you bump it 2 on the consult it does not bump it 2 across the board. I have all kinds of consult printouts of dyno runs that shows this.

 

From our experience tuning NA 350Z, there is almost no power to be made by advancing the timing with pump fuel....even if you advance it a significant amount. The vast majority of the gains are made by enhancing the AF curve, and we're able to get major trq and power gains through the power band. The best gains in the midrange 20+, and about 12-15whp improvement up top.

 

OK Thanks for clearing it all up...basically its a waste of time and money if you have to pay for it...just get a piggyback ems...got it!

Russ

 

Ditto. So UTEC anyone?

 

One question Sharif, higher octane needs more energy to ignite, so retarding the timing after your put higher octane rating fuel should be desirable, right ? Unless you increase the compression ratio to increase the thermal energy added due to the extra compression to negate the effect of the higher octane fuel.

What is the timing angle set at before the TDC for the VQ engine, know its variable, but for idle lets say?

Thx.

 

Adding higher octane fuel, without changing the timing, can result in a slight power loss (most higher octane fuels burn slower). With higer octane fuel, you need to run more ignition timing advance, not less. Higher octane fuel burns slower, so you need to ignite the charge sooner...rather than later...in order to achieve peak cylinder pressure at roughly 15 degrees after TDC.

 

Thanks for clearing that up, I dont why I was thinking advance means closer to TDC than away from TDC. But if you advance the timing too much, then the combustion is working against the compression, so getting it pressure to peak out at 15 deg after TDC is very important.
How do you actually tune that, of course without giving out the proprietary info? If you could just explain the process for my knowledge and others members.