Detonation after tuning: Need opinions!

[Stephen31201]

I had my 2006 Roush supercharged mustang tuned by a reputable company. They noticed on the dyno that my belt was slipping pretty bad above 5k rpm. I paid the $500 fee and ordered an 8 rib kit. Upon installation I noticed it made boost earlier and definitely no longer slipped on the bid end. Had him retune. I drove it home and it seemed fine, but I really didn't have anywhere to try it out. A couple days later I drove out to the country and made a couple runs and it was detonating again. I have attached a pic of the log I made. Its showing 20+ degrees of timing which seems high to me for a supercharged motor on 93 octane. Please look at this and tell me what you think and see. I am knew to tuning so I may not be seeing things correctly. Thanks in advance!

 

[07 Boss]

If it's knocking why don't you have any readings on the knock sensors, that should automatically pull some timing. And yes 20* is a lot. I think we turned my car down to 15* or 16*. I know guys run a couple more degrees but we turned it down to keep power levels in check. I would have someone else take a look at your actual tune that this reputable shop has done for you. And they shouldn't have charged you to have their tune looked at and adjusted for issues. It's not like you threw another part on there and had to have adjustments made for it.

 

[retfr8flyr]

I agree with 07 Boss, you shouldn't have been charged just to tweak his own tune for something he told you was needed. I also think that's way too much timing for pump gas. I think I would give up on this "reputable shop" and contact Lito, to look at your data logs and fix your tune.

 

[Stephen31201]

Yeah, I kinda thought it wasn't right to charge me again and definitely not that much for 20 mins of retuning something that wasn't right initially in my opinion.
I tried to take out a couple of degrees from the 4000-8000 section that he left adjustable but when I do it puts the car in limp mode. Aggrivated is an understatement.

 

[BruceH]

Unfortunately the term "Reputable Shop" can mean anyone who pays advertisement fees. The sad reality is that most reps are earned through paying protection money to forums. The protection money gets bad reviews and experiences expunged.

Do what Earl said and get in touch with lito. Cut your losses now.

I'm not seeing the scale for rpm and timing. Having over 20 degrees of spark is quite normal at lower rpms and lower loads. Do you know if your knock sensors are turned off?

 

[Stephen31201]

Is spark different than degrees of timing or is that the same thing? Did you see my pic in the first pic? I am assuming he turned them off because they aren't showing any knock but you can definitely hear it at 5k and above. Ill send Lito a message and see what he can do.

 

[weather man]

Might want to pull the plugs and inspect. Audible knock over 5,000 RPM can toast shit fast.

 

[hamish]

How much boost is your motor seeing?
I'm pushing 20-21* with my current tune @ 10psi, no issues.

 

[Stephen31201]

I'm running a 10lb/3" pulley and seeing about 6#s. 20-21* on pump gas? Seems like most of what I read, everyone is saying 15-16* on boosted cars, but I know every single one is different.

 

[eighty6gt]

Based on my experience the higher timing numbers work with these engines, maybe that goes out the window when you install camshafts or something.