when my car was tuned back in august i wasnt hitting as much boost as i am now thats it's colder outside, I dont think im pulling enough timing now. Im hearing what i THINK might be detonation but not 100% sure, i hear the sound start at around 5000 to 5500 rpm. starting at 5k rpm im hitting 6 lbs and the R4 B map says im pulling 0 degrees of timing. next is 5500 rpm and hitting 7 lbs of boost and pulling 1 degree of timing. then 6k rpm hitting 8 lbs of boost and pulling 2 degrees of timing. does this sound right ? should i up the number in these cells and do a run to see if the sound goes away ?

thanks guys

 

I think you better pull some timing . Some one that knows will chime in , but it doesnt seem like enough at that much boost on a stock motor . The SS box pulls 1.5 degree's from signal delay . So at 5500rpm and 7psi you have 2.5 degree's pulled . I would think you need at least .5 degree's for every 1psi . Sounds like it was tuned to the edge of being safe . And the gas for this winter maybe not very good [winter blend ] . Are you on a stock block ? And are you running the 3.12 pulley ? Seems like alot of boost for the stock blower at that rpm

 

Thinking about it . I was pulling 5 plus the 1.5 for a total of 6.5 degree's when I broke a ringland on piston #5 . With a 11.5 to 1 A/F and at 9psi at 6,800rpm

 

1-2 degrees is not nearly enough being pulled, if i remember correctly, the ECU will normally run about 32-34 degrees advance at about 6000 rpms, around 28+degrees at 5000 rpm...

so, by you pulling 1-2 degrees, you are still most likely seeing a 30+ degree advance at high rpms!!! get the EU so you can see real time timing, much much safer way to tune!

hope that helps

 

Ive datalogged my timing with a OBDII and it shows 22 degree's of advance at WOT and advances 2 degree's after 6000 or 6500rpm

 

that's after you have PULLED timing, correct..that's what i see when i pull 11-12 degrees!

 

No..the OBD doesnt show what you have pulled with the piggyback . I could be wrong , but I believe thats what Ive been told several times

 

The signal for timing and fuel injector pulse are send thru the piggyback , and it alters it before sending it to the motor ...Correct ?

 

The stock timing is at around 26 degrees. Some people suggest to pull 1/2 degree per lbs of boost, but I decided to pull 6 degrees from 4k rpm to redline, and I'm only running 7.5 psi. Its always good to be safe.

Here's a slip of my stock timing at 6K rpm.

 

I've been told the same thing. The OBD reads the timing before its pulled.

 

I recommend pulling .75 degrees per psi if you want a straight up retard. If you want a step retard, this is what I recommend:

0 to 3 psi pull .45 per psi
3 to 5 psi pull .55 per psi
5 to 7 psi pull .65 per psi
7 to 9 psi pull .75 per psi
9 to 30 psi pull .90 per psi

 

is there any danger in trying this with my r4 software for now ? i mean, can you pull too much timing ? also in the r4 software, the cells, basically the number thats in the cells is the number of degrees im pulling correct ? so if at 5k rpm im hitting 6 lbs of boost i should be pulling an extra 9-10 degrees of timing ? how bad will this affect my cars speed and boost ?

 

Wonder why [2] cars are that much difference ? Mine being 22 degree's advance and your 26 degree's . Could that acount for the extra HP the Z has over the G ?

Backagain
do you have the R4 program ? or a copy of your file [ maps ] on your computer ?

 

Timing being pulled with a SC should be done differently than with a turbo car . It should mostly be done in a step up style . More retard as boost rises

 

yes i do boog.

 

PMed you

 

Im running the stock timing map with the 3.12 pulley. The only tuning was the a/f. I was under the assumption that MOST people tuning the vortech only adjusted the fuel map. Did you tuner tell you he adjusted timing as well as fuel?

 

it was done by a reputable company, im sure they adjusted it,

 

what octane you using?

 

93 octane. i will have an update later tomorrow, i had somone help me with the timing map. the noise i heard is now gone. i'll check with who helped me to see if he wants to say his name or he can chime in if he wants. im also hitting more boost now, found out the front plenum bolts under the engine cover were lose and the belt was a little lose. 9.4 lbs now at redline. steady boost linear graph now.