Closs2sx

I have done the following mods to my 2015 m7 z06 with 2800 miles on it
Cnc ported throttle body
Halltech intake
Arh 1 7/8 long tubes with x pipe to axle and no cats
Ngk plugs
Msd wires
Ati damper and 15% over drive lower

Dyno jet dyno showed 626 hp 657 torque at wheels
It was 78 out and intake air temps were warm at 94
Wondering if this is about what I should expect or should it be more
Boost was 14.5 till about 3k rpm then dropped to 12 until 5.5k then jumped back to 14.5 I assume belt slip?
What is the best option to help with slip?
Gonna order a chiller for heat
Did same mods to my dads 13 zl1 m6 and he's at 598 hp and 568 tq on same dyno in similar temps but his lower pulley was a 10% and he was at a consistent 11.5 on boost
I was kinda looking for 675 ish but I guess I was wrong
I have heard the c7 m7s are tough to tune
Tunner did for get to shut off the po158 in the tune so 8 miles from shop it threw a Check engine light
Would that keep numbers low? Or are my numbers about right?
Same tuner did my dads car and has been great and is even coming to me on a Saturday to fix the tune to not look for the p0158 so I have no complaints
He is a good tuner has lots of experience with the Lsa but not much with lt4 so I'm wondering if he's missing something or if my code caused the lack of power or if I'm about right where I should be?

Thanks
Brett

Higgs Boson

could be right depending on location, weather, dyno, dyno settings, tune etc etc it's not like you made 500 but really the intake, pulley and headers are your only power mods....

Closs2sx

I realize that the intake pulley and headers are my only power mods but I did the same to my dads zl1 and it put down 598 on the same dyno in same conditions so he picked up about 98 rwhp with only a 10% pulley I put a 15% on. Based on the fact that the intake claims to give 40 I got 26-36 hp from headers and pullley. Maybe I'm wrong but it doesn't seem right to me

Higgs Boson

tune is a major factor, completely different ECMs and many aren't very good at tuning them. and yes, I mean many that ARE good at the older stuff don't have complete control of the new stuff.

E92 and direct injection.....not a lot of fun, IMO.