There is a shop that SS referred me to locally, but they mostly tune Vipers and Ram SRT-10s. They do seem knowledgeable with the R4 software however.

My question, is there anything that would differ in the tuning procedure with the Z (like would they need to know the a/f ratio for the vehicle)? I would like the vehicle tuned for reliability over power. Any help appreciated

 

If Split Second referred them , Im sure there wouldnt be a problem with them . With the Vortech set up . You might want to ask them what they think of doing a step up timing map . [ increasing timing retard as boost rises ] instead of the rpm base retard the Vortech comes with .

 

Booger, I thought you said stick with Fuel in first place and ignore timing (first order). And surely SS retards timing vs boost anyhow?

Stuck it to the UK tuners wrt fuel and timing, and their reply, which was comforting I suppose was, 'Who the f*ck are u trying to tell us what we've been doing for 30 years'

Time will tell but not hopefully expense

 

If I remember right , I think I said the opposit . Have them tune the fuel and leave the timing if they weren't comfortable and familiar with the R4 . In his case , he has some one that knows the R4 very well and will be able to tune every aspect of it

 

If they tune a lot of Vortech Vipers, they'll have no problem using the R4 software on the Z.

 

Map B has both rpm and boost as ordinates for ignition timing retard..

 

I didn't phrase my comment well; when I said 'stick with fuel' that meant stick to ONLY tuning fuel and leave timing tuning alone - for a first tune anyway.

 

agreed we tune Vipers here when installing the Paxton kit, the program is setup the same and everything they should have no problem tuing your car.

 

The timing on the stock R4 350Z tune is extrememly low...about 10 degrees of advance through most of the power range. There is great power to be made by also adjusting the timing as well, to a more reasonable level.

 

Thanks guys, you all have been a great help.

BTW, how's the traffic in Charlotte Sharif? I know here in CA with 622whp you couldn't do much, LOL jk (jealousy).

 

Also, does the dyno let you know if you are running lean/rich off the bat? Or do you need to know the vehicle's specification (e.g. A/F ratio)?

 

Haha...I'll never forget the horrific traffic on the 210, 101, 134, 10, etc...that starts at 2pm, and never seems to end.

Charlotte has a true rush "hour", and thats about it.

 

[QUOTE=Sharif@Forged]The timing on the stock R4 350Z tune is extrememly low...about 10 degrees of advance through most of the power range. There is great power to be made by also adjusting the timing as well, to a more reasonable level.[/QUOTE

The stock Vortech timing map starts timing retard at 5000rpm at [1] degree and steps it up every 500rpm after that ...2 , 4 ,6 10 ,15 degree's . If Im looking at the right stock map I have

 

[QUOTE=booger]So depending on where your stock ECU is setting timing...around 20-25 degrees at WOT towards redline, that could put you at 10 degrees of total advance at readline, which is too low. The only way to know, is to log the actual ignition timing with a scanning device.

The way Vortech did their stock timing map is screwy....not sure why they did that. Timing needs to follow the trq curve, moreso than RPM. Timing needs to advance towards redline, not retard...as the piston is moving faster towards TDC....and the spark needs to fire sooner in order to maximize power.
Ideally, peak cylinder pressure (power) occurs at roughly 14 degrees after TDC...and if you fire the spark too late at high RPM, you will loose power.

 

[QUOTE=Sharif@Forged]I think thats why they did it that way [ to be safe ] . As soon as you pass [ say 6500rpm and 6 degree's retard ] it starts reading the 7000rpm timing of 10 degree's retard and would put you at 12 degree's advance if you are at the ECU's 22 degree's advance at WOT...like most of us . Most every one I've talk to takes out timing with a SC at 1/2 degree per 1psi of boost as boost rises . Then holds it to redline when a certain advance is reached , even though boost is still rising . Im still looking for more info on timing and SC's

 

Surely you do want to be reducing timing advance as boost rises because at higher pressure and temperature in the combustion chamber, detonation (burning of the end gas well after normal burn, after peak cylinder pressure) will be more likely to occur. So you reduce timing advance to reduce this tendency.

 

I didn't quite understand your statement. You need to retard the timing as trq peak approaches, and then slowly advance the timing towards redline.

 

I must've misunderstood what earlier posts were saying - so to clarify, I agree with your statement above 100%.

The attached is roughly what I think the Vortech does - please contradict me or advise, if it does do this, why this is incorrect - I think it is the correct thing to do to minimise detonation at high boost.

I'm happy to pull the diagram and leave it with the first sentence if I'm wrong

 

Sharif
I understand why this would be best for a turbo set up [ boost is stable and holding to redline ] Would you take the same approach in a SC set up , when boost keeps rising to redline ?

 

Yes I would...but a slightly different slope. Timiing should follow the trq curve. I have noticed that the SC's tend to produce flatter trq curves towards redline, so I wouldnt advanced as quickly as I would with a TT setup and a rapidly dropping trq curve. But there still needs to be some advance towards redline, for the engine to operate correctly.