Steeda's Bullitt Mustang Dyno Test & Tune

[Shipey]

We are looking at possibly having the tune available in the next couple of weeks - we have a final couple of tests we need to do on it before we can release it.

Stay tuned for more info.

Best Regards,

TJ

Will the tune be emission legal?

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[tj@steeda]

The rims should be available late Q1 this year. We will have a formal announcement when they are available.

Best Regards,

TJ

 

[tj@steeda]

Will the tune be emission legal?

I will have to get with our tuning dept. & see what they are planning for.

TJ

 

[rcl4668]

Thanks so much TJ!

 

[Dusten]

Assuming about 15% loss, though I think modern manuals may be closer to about 12%, it's roughly 535-540 crank. Same as some GT500's. Interesting that we are already catching up with supercharged 5.4L's from like ~8-10yrs ago. Also more than the GT350.

Gale Banks has a pretty good story about this issue. Power loss isnt a percent. Typically transmissions and rear ends rob a set amount of power, not a percent. So as the power level goes up, the gap between engine and rwhp doesn't increase.

 

[Jetset335]

I noticed in the video that stock tune red lined at 6900 rpm vs 7900 rpm for steeda tune. I wonder if that's why the top end HP is so much higher. I does look like solid gains through out the graph.

 

[Idaho2018GTPremium]

Assuming about 15% loss, though I think modern manuals may be closer to about 12%, it's roughly 535-540 crank. Same as some GT500's. Interesting that we are already catching up with supercharged 5.4L's from like ~8-10yrs ago. Also more than the GT350.

Loss in a manual is around 11%. So, 457hp/0.89 = 514 crank hp. Stock dyno was 435 hp/0.89 = 489 hp. Not too shabby. I also noticed they stoppped the factory test at a low rpm. There was probably a few more ponies to be found in there if they ran it to redline.

 

[Idaho2018GTPremium]

Gale Banks has a pretty good story about this issue. Power loss isnt a percent. Typically transmissions and rear ends rob a set amount of power, not a percent. So as the power level goes up, the gap between engine and rwhp doesn't increase.

I didn't read Gale Banks' story about this. However, I'm inclined to disagree. The more power an engine makes, the harder it twists on the metal and gearing and other drivetrain bits. Thus, the amount of friction goes up with higher power, thus, it has to be a % loss. It's not simply a set amount of power that is lost. I generally use 11% for manuals and 12.5 or 13% for autos. And keep in mind, you don't simply multiply the rwhp by 1.11 or 1.125 (or 1.13). That would be a bit short, because the % loss is based on the crank hp value, not the rwhp value. Thus, you have to divide by 0.89 and 0.875 (or 0.87 if you assume 13% for the auto), respectively to calculate approximate crank hp values.

 

[BrettT]

Loss in a manual is around 11%. So, 457hp/0.89 = 514 crank hp. Stock dyno was 435 hp/0.89 = 489 hp. Not too shabby. I also noticed they stoppped the factory test at a low rpm. There was probably a few more ponies to be found in there if they ran it to redline.

Yes, it looked like they stopped at 7,000rpm. Carl Widman said in one interview I saw that the Bullitt makes power right to redline, so yes they likely left some on the table.

 

[Dusten]

I didn't read Gale Banks' story about this. However, I'm inclined to disagree. The more power an engine makes, the harder it twists on the metal and gearing and other drivetrain bits. Thus, the amount of friction goes up with higher power, thus, it has to be a % loss. It's not simply a set amount of power that is lost. I generally use 11% for manuals and 12.5 or 13% for autos. And keep in mind, you don't simply multiply the rwhp by 1.11 or 1.125 (or 1.13). That would be a bit short, because the % loss is based on the crank hp value, not the rwhp value. Thus, you have to divide by 0.89 and 0.875 (or 0.87 if you assume 13% for the auto), respectively to calculate approximate crank hp values.

Banks stated he tested it, and saw repeated results. And it wasn't a story, it was in an interview.

 

[TomLake]

Thanks so much TJ!

Got the Tune from James! Get the Tune! Awesome!!

Tom

 

[rcl4668]

Got the Tune from James! Get the Tune! Awesome!!

Tom

Congrats Tom! Can you or James shed some light on how to order and install the tune? Thanks in advance!

 

[Bullitt0819]

Two questions:
1) is it 50-state--i.e. California--legal?
2) what octane requirement (note the Bullitt will run on 87 in a pinch; sometimes, that's all you can get)?

 

[TomLake]

Congrats Tom! Can you or James shed some light on how to order and install the tune? Thanks in advance!

Go on Facebook - Tuning by James or the Web! He is in Florida. Tell him I sent you!

 

[TomLake]

Two questions:
1) is it 50-state--i.e. California--legal?
2) what octane requirement (note the Bullitt will run on 87 in a pinch; sometimes, that's all you can get)?

I know its a 93 Octane tune! Give him a call!

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