minmad78

Hi There,

I am buying a Coyote crate motor for my 67 rebuild and after viewing the engine dyno results (not chassis) was wanting to know if anyone else has seen the flat spot created in the torque curve when the cam phasing is changed?

Its very noticeable and more so with headers and flash tune on the factory ecm. My dyno guy says that the effect is a direct result of the phasing, and without remapping the Ford parameters for the VVTi completely all he can do is move it up or down the curve.

Any comments would be appreciated either relating to engine vs chassis dynos, cam phasing, mapping etc etc

Thanks in advance from an enthusiast from NZ

Blown CS

I'm no expert, but what is your A/F ratio right when the dip starts. Curious if it could be knock retard.

FastRedPonyCar

mine is not nearly that pronounced but there is a slight flat spot in the curve. I don't FEEL it though when driving.

I would contact Shaun at AED. I feel like he's become more or less the community's favorite/guru when it comes to tuning the coyote. If anyone could address this, it would be him.

minmad78

Thanks - I guess I will have to wait unti it arrives and see what its like on our dynos here....

It sounds reasonable that the phasing is the cause, just didnt think Ford would have let it be so pronounced.

CHeers

DarrenGT

that is an explanation i heard while mine was on the dyno.

minmad78

so were you able to do anything about it (and what) or did it get left if you were just recording the output?

DarrenGT

didn't do anything about it. he did some winkydink calculations to guess what it might be, but that's it. i'm not modding my motor for a while.

SMOKE46

I have a hesitation at ilde if I push pedal quick but nothing through powerband increase. Either it's fuel or timing I'll see when I take it in, only have 1 K on it for miles

RC13GT

If you want to turn the Coyote into a beast, delete VCT, get phaser lockouts, and then have custom cams and a Dyno tune. Deleting VCT allows for much more tuning of the cams, and you won't have a flat spot in the curve.

SMOKE46

THANX for info but don't wanna mess with warranty I have extended too. oh no ! If I could only get my old tuner to come up from FLA. he would get it out he tuned my Lightning 12 years ago & it hasn't even burbed, he was a Ford mastertech who had his own shop in Long Island NY

RC13GT

Whoops, quoted the wrong person. I mainly meant that for the OP. I don't want to screw with my engine either. Suspension and other things, yeah, but not the engine.

minmad78

Well my engine is on its way to NZ - sea freight from Philly - so now to get the chassis finished to accept its new heart!

wish me luck.....

DarrenGT

Good luck!

Blown CS

Im sure you will enjoy, best of luck.

zeroaviation

Would need to see the datalog to give any feedback.

cheers,
-Matt

BBM3

I am no expert either.
Were is the torque curve? The Y-Axis is labeled HP
Is the X-Axis miles per hour?
I am accustomed to seeing plots with RPM on the X-Axis and HP and Torque on the Y-Axis.