On most dynojets a stock GT 5.0 seems to put down around
375-385 rwhp, and 30-40 more with intake and tune.

What are you guys seeing on for the Boss 302
Stock?
Intake and Tune?

Cheers

 

Stock - 390rwhp - Dyno'd 4 days after taking delivery.

 

Here are our numbers for cold air and tune on a Boss 302, done on our dynojet. Our tuning, our Boss specific cold air, 93 octane.

 

Wow, really only 390-395 rwhp?

My stock 2011 GT 5.0 laid down
383 rwhp on a dynojet when it had only 800 miles on it.

I would of thought the Boss would of put down more than just 10 rwhp more.
I know different dynos but still, I was thinking the responses would of been in the 400-410 rwhp range.
I know that's just "peak" power and what matters is the power under the whole curve and also at the top end for acceleration, as proven by the Boss running about .5-.7 seconds and 3-5 mph faster times in 1/4 mile runs over the GT 5.0

SteedaGus, thanks for the dyno plot.
Picking up 30 rwhp from a intake and tune is quite good.

 

Dyno numbers don't mean much. Way to many variables. Mine put down 398WHP on my friends dynocom. They are really a tuning tool and trap speed is a better indicator of performance gains. Two identical dynos will not read the same and results will vary based on many factors. Most dynos I have seen for stock Bosses have been in the 390 to 405 range with the exception of the one mustang dyno I have seen that was around 360 whp. Mustang dynos read low.

 

Trap speeds vary as much as dynos however.
I've used dynos for years to get an idea of what mods do and where they gain (or loss) power. And yes, tuning on a dyno is very helpful and what they do best.
But I've also spent a lot of time at drag strips and know that you can have 2-3 mph different trap speeds on the same night.
Actually, there are way more variables to affect trap speeds on any given day or night than what will affect dyno results.

The reason I asked about the dyno numbers here is I know the 11-12 GT 5.0 is underrated at 412 hp when it's probably closer to 420.
But wasn't sure if the Boss was as underrated at 444 hp.
But if 390-400 rwhp is a common result on a dynojet dyno, I'd say no, the Boss motor is not as underrated.

I'm also curious to see if the 2013 GT with it's new 420 hp rating is just a rating change to reflect what it's closer to in reality or if Ford actually did tune 7-8 hp more into the engine.
That will be hard to prove however, as 7-8 hp in a car with 412 hp to begin with is going to be hard to see on a dyno or on a strip.
Unless of course you have at least 5 2012 GT 5.0's and 5 2013 5.0's at a dyno shop and the 5 13 models consistently show a few more peak hp.

 

This guys base line on a mustang dyno was 356 on a mustang dyno and he ran a 12.3 at 117 stock. Granted, he is a good driver.

Burnin4

 

Stock with about 600 miles...

 

Must also be a good track.
One car mag got
12.3 @ 116.9
as well, so it's clear that time and trap is possible with a good track and good driver for the Boss 302.
I have a feeling 12.5's @ 115 is probably more like average.
But that's still quite a bit better than the
13.0 @ 111 average for a stock GT 5.0

I know Mustang Dynos read lower, I've done almost all my dyno runs on a dynojet.
But when I had my 335i I did baseline runs before mods and it put down
272 rwhp on a DynoJet and
251 rwhp on a Mustang Dyno
That's my old run I've ever made on a Mustang Dyno.

 

This dyno plot is a PERFECT example as to why if/when you go to a dyno you need to do AT LEAST 3 pulls.
Preferably you would of had a bit more time between each pull (like 4-5 minutes for a bit of cool down) but still, your car got STRONGER in the last two pulls over the first two.

That's quite common and tells me that the Boss 302 has an "adaptation" ability built in. Seems the first couple runs it pulled timing/cam profile a bit on the roller since the car was probably sensing something was "different".
Once it realized all was ok, it advanced the timing or cam profiles and made more power.

Good post, thanks for that.