Dyno'd today, thanks Locobob.

[XfireZ51]

Originally Posted by efnfast

Hard to say on SOTP, it was almost 6 months in between drives with the new top end parts. Also should add, Marc chip done with exhaust, and redone for the porting. Marc may have gotten a little aggresive, we think we saw some detonation at between 6k and 6500. -Steve

I'd be surprised about that. Did you run a WB O2 with the runs? Detonation usually happens somewhere right around torque peak. Likely why u see a bit of a sag in the torque curve at the rpm before it continues further up.

[efnfast]

Originally Posted by XfireZ51

I'd be surprised about that. Did you run a WB O2 with the runs? Detonation usually happens somewhere right around torque peak. Likely why u see a bit of a sag in the torque curve at the rpm before it continues further up.

We had some fluttering in the curve at top end. He suspected detonation. A/F was about 12.5 when it happened. Didn't feel it, just see it on the curve.

[XfireZ51]

Originally Posted by efnfast

We had some fluttering in the curve at top end. He suspected detonation. A/F was about 12.5 when it happened. Didn't feel it, just see it on the curve.

You will usually see "fluttering" especially at top end. There's fluctuations that could have something to do w traction on the roller etc. There's also "smoothing" which is part of the software. I've bumped my timing up to 34d+ at top end and motor did not detonate, it just dropped in power. I'm pretty sure Marc's cal is more conservative than that. 12.5 is a bit fat IMO, but that will also be dependent on whether the overall tune is rich or lean. I'd also want to see what plugs look like.

[efnfast]

Originally Posted by XfireZ51

You will usually see "fluttering" especially at top end. There's fluctuations that could have something to do w traction on the roller etc. There's also "smoothing" which is part of the software. I've bumped my timing up to 34d+ at top end and motor did not detonate, it just dropped in power. I'm pretty sure Marc's cal is more conservative than that. 12.5 is a bit fat IMO, but that will also be dependent on whether the overall tune is rich or lean. I'd also want to see what plugs look like.

Thanks Dom, eases my mind to think I'm not detonating at 6 grand.

[1990 quasar blue]

Originally Posted by efnfast

OBX ceramic coated headers and OBX exhaust.
SAE adjusted, but it was a perfect day and there was no correction. -Steve

Thanks. If you want to meet up in epping one day let me know.

[XfireZ51]

Originally Posted by efnfast

Thanks Dom, eases my mind to think I'm not detonating at 6 grand.

Steve,

Obviously you pull a few plugs and just make sure there's no aluminum pitting in the ceramic.

[efnfast]

Originally Posted by 1990 quasar blue

Thanks. If you want to meet up in epping one day let me know.

Where in MA are you?

[efnfast]

Dom, the plugs look to have sort of a grey color to them. The two I pulled have gone from the .0050 (at Marc's recomendation) to .0060. Iridium plugs.

[1990 quasar blue]

Originally Posted by efnfast

Where in MA are you?

South coast. About 1/2 hour from the cape.

[efnfast]

Originally Posted by 1990 quasar blue

South coast. About 1/2 hour from the cape.

Headed to Worcester next weekend.
Epping to watch the races, or Epping to race? -Steve