Gen 3 2.9L Whipple S550 Mustang GT Dyno Results - VIDEO INSIDE -

[Trevor@FatFab]

Hello everyone,

We at Fathouse Fabrications recently finished up installing a Gen 3 2.9L Whipple Supercharger kit on our customer's 2016 Automatic S550 Mustang GT. The only other modifications to the car are Roush Axle-Back Exhuast and billet OPG's. We tuned the car conseratively on 91 octane because it was getting shipped overseas, and on 9 psi the final results were 673 rwhp and 559 rwtq.

Below is the dyno video as well as some photos of the install.

 

[smashedheadcat]

That afr makes me cringe.

 

[GNBRETT]

on a dynojet that seems awful low.

 

[Tifosi2003GT]

So weird that you would buy a 2.9L blower and only run 9#'s...

 

[DarkMach1]

I wouldn’t push it. Add E85 and longtubes= 750 easy

 

[Ben@fatfab]

This is a safe tune at low boost for 91 octane, no sense in pushing it. Its also stock throttle body. The big throttle body is worth quite a bit of power.

AFR is perfectly fine for this setup

 

[smashedheadcat]

There is nothing conservative about 12.5ish to 1 at peak torque and roughly 13:1 througout the meat of the power curve on 91 octane.

 

[scott_0]

That afr makes me cringe.

I feel the same way, lean is mean as they say, I'd have a hard time with that a/f if I were the owner

on a dynojet that seems awful low.

this is only a stage 1 kit, I actually think the numbers are on the high side........




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[DarkMach1]

Who cares what Dyno sniffer says? Go by Lambda.

 

[Ben@fatfab]

It’s stock exhaust tail pipe reading. They are full closed loop and it’s 0.79 lambda

Tail pipe reading is usually 0.7afr leaner than actual and cats will make it read even more lean. So really no use in even having that on there. It’s not used I just forgot to remove it from the dyno graph before I saved it as a jpeg.

We know what we are doing and the car is tuned very safely.

 

[CobraBob]

You aren't rookies, Ben. Hopefully your overseas customer will be very pleased with the work you did. Nice numbers for a safe 91 octane tune. Just curious, what country is it being shipped to?

 

[Ben@fatfab]

Nice numbers for a safe 91 octane tune. Just curious, what country is it being shipped to?

Somewhere in Europe. I believe they have higher octane there we just have no way to test with it so we wanted to tune conservatively with 91 oct so he will be fine on any grade he uses there.

 

[DarkMach1]

It’s stock exhaust tail pipe reading. They are full closed loop and it’s 0.79 lambda

Tail pipe reading is usually 0.7afr leaner than actual and cats will make it read even more lean. So really no use in even having that on there. It’s not used I just forgot to remove it from the dyno graph before I saved it as a jpeg.

We know what we are doing and the car is tuned very safely.

Some are still living in the early 2000s judging tunes by tail pipe sniffers lol

 

[smashedheadcat]

It's not really "living in the 2000's" going by the tailpipe, it's simply looking at what was posted. I appreciate the OP clearing up his commanded lambda setting though. I lived in Switzerland for a few years, and the fuel there is typically 98 octane. Provided the OEM sensors are functioning properly and see .79 lambda, this is a great spot to be in on 98 octane.

Something to keep in mind:

I understand most enthusiasts with any age on them have sort of calibrated their minds around the old 14.64 stoich (E0) pump gas. I'd be pretty confident in assuming that the tailpipe sniffer/readout is calibrated to read off othat scale as well.

For reference
.89 is 13.0 = OUCH (shown on the dyno graph)
.82 is 12.0 = Not conservative on 91
.79 is 11.56 = Sort of conservative on 91
.75 is 10.98 = Conservative on 91

You have oxygen sensors (that are not lab-grade) that each report an average of the lambda on a bank of four cylinders. Odds are, you've got a lean cylinder and you've got a rich one. The leaners cylinder may not be conservative at all.