Pulley goes on wednesday. For those that have tuned after should i worry about the timing map or just the fuel. Im running the stock map right now and my wideband goes flatline rich over 6k. Im also running cdn. 94 octane all the time. TIA

 

Vortech's stock timing map...is ...-2 degree's at 5000rpm ....-4 5500rpm...-6 6000rpm...and -10 6500rpm . All of the maps Ive seen from good tuners , retard the timing via psi instead of rpm . It can be taken out more gradually . Find a good tuner...they will know how little of timing retard they can get away with and still be safe

 

Booger , are you sure Vortech stock timing is only on RPM and not boost also?? Map B has both RPM and Boost for timing...

 

Yes it does...but the stock map that comes with the kit pulls timing as I stated and not by boost . Most tuners will switch it to retard timing as boost rises....not as rpms rise . Im sure AAM tuned your timing this way

 

So the stock timing retard map B which has boost on the top column and rpm on the left column comes with timing retard based only on rpm?? What's the reason for boost? What am I missing??

 

If you looked at your B map . You will see 0 in all cells at 4500rpm or lower . And you'll see a 2 at 5000rpm across the whole boost range , left to right . Meaning no matter what boost level your at....at 5000rpm the SS box will pull 2 degrees of timing . If it was done by boost .Say 2 degrees at 5psi...no matter what rpm you are at , if you are at 5psi it will pull 2 degree's ...up and down . Hope it helps understand it

 

In thinking about it boost builds off rpm and MAF and is very linear. Below 4500 rpm little or no boost is possible. Under wot the rpm's increase while boost builds linearly. It's very repeatable/predictable. At wot boost builds linearly as rpm increases and therefore a set safe timing retard logic based on rpm makes sense. For a turbo application where boost is not linear with engine rpm a retard logic based upon boost is critical..

 

Well the problem is the SS box it self . Pulling timimg via boost allows you to do it more gradually . Every .5 psi.....Doing it via rpm ....you can only pull timing every 500rpms .Pulling timing out via boost results in a smoother power and trq. curve