When I dynoed my 05 truck in my sig it put down 270 hp and 505 ft lbs with my quad box on 0 so there was only boost fooling going on there. With the quad box on 100 I dynoed 381 hp and 685 ft lbs. I just saw someone say they put down 3?? hp and 7?? ft lbs with only a cold air and exhaust. I was on 35 inch tires and dynoed in 5th gear. I do not know what brand the dyno was. I did not know that was an issue.

 

That sounds about right for stock. Mine dynoed 277.8hp/517.7tq with the box turned off. That was with a htb2 62/12 turbo.

 

278/515 stock 100%

 

mine did 307 0r 317 with just the phat shaft 66 turbo

 

Solar Yellow, you may have read a thread where I mentioned mine.

Factory stock mine dyno'd at 280 hp and 528 torque. With air and exhaust upgrades mentioned in my signature it dyno'd on 4-1-06 at 320/771.

That is a gain of 40 hp! Kinda surprized me. And the torque number really surprized me.

I don't have any other boxes, chips etc. on mine at this time. Im Still running stock fuel supply and turbo. Hopefully soon I will get tranny and fuel upgrades then let the real BOMBING begin.

 

Hey, I don't wanna burst your bubble, but you need to know how that dyno measures torque.

You did not gain 243ft lbs of torque with a intake and exhaust.

That particular sytle Mudtang Dyno measure engine torque measured at the wheel. They use a strain gauge and not a calculation based on rpm. So in other words you probably need to take your torque number and subtract from 25-30 from it and it will be correct.

I also think the dyno was slightly high, but there is no way to know for sure?

I wished I could claim that dyno was 1000% correct, but I am slightly skeptical, at least on the torque.

There was a 05 truck that made 452/1069 with a race box, exhaust and intake. While I would like to claim that for every truck I do not think it is going to happen. The torque is for sure wrong. If you take 25% from it, the number is at least believable. That puts it at just over 800 ft lbs.

the 25% represents the drivetrain loss.

Also the fact of a dyno reading high or low makes no difference as long as you measure your gains on the same dyno. The number gained will be accurate even if it is high for a stock number.

I would get on a dynojet next time you can. They are not good to tune on, but for repeatability across the country they are great.

 

QZilla,

Thanks for the insight. I really don't know much about the dynos. My numbers when the truck was stock were measured on a dynojet at 280/528 in 4th gear.

This dyno in Emory on 4-1-06 is a Mustang. My first two runs I was in overdrive and it kicked down into 3rd and then shifted back to 4th and had some really screwed up numbers. Really low and wild looking graphs but they deleted them off and just gave me a sheet with the 3rd run.

On the 3rd run, I put it in 3rd gear by hitting the tow/haul mode and that is the numbers they said it ran. 320/771. I can maybe post a pic of the graph of the results if it would help any.

I was expecting about 300hp and something bigger than 528 on tq with the Air/exhaust. I don't doubt what you are saying may be true on the TQ number.

The Mustangs vs. the Dynojets appear to be two totally different animals.

I don't really understand how the dynos work and I felt like I was being rushed out of there so they could move on to the next dyno...since there were so many to do and had been done. Nature of a "Dyno Day" I guess.

 

My 05 did 417/827 with just a TST box nothing else, stock air box and exhaust the box was set on 6/5 and the tranny was slipping.

CRIS

 

yeah i didnt think my torque numbers sounded right 547hp/1375 ftlbstrq.
but still was impressed with hp.

 

texaspower19 ,you made 500 + hp and your sig says sbc and fass on the way.what turbo you running now ? did you make those numbers without fuel pump or clutch mods?

 

stock turbo, stock clutch, quad stnd, bd with crazy larry, ats intake manifold, quad cold air, and straight pipie is what i dynoed with.

 

unbelievable

 

thats all i got believe it or not. ican send you the full size dyno sheet emial if you want.

 

Can anybody else with some extensive experience with Mustang Dynos make any comments as to why the numbers would NOT be accurate for me and TexasPower19?


Why would the numbers be reading high? If anything it would seem like they would read low.

 

I do not necessarily think the numbers are not accurate. I believe them to be 100% accurate.

The problem is knowing what formulas they were using to measure torque. In most terms torque is calculated using a formula based on horsepower at a certain RPM. This Mustang measured it using a strain gauge. The formula they used is to tell you Engine Torque measured at the rear wheel. It is accurate, but it is not telling you rear wheel torque. To dervie that you need Mustangs formula. I would assume a 25% loss.

Of all people I would wish the torque numbers to be right. I mean a single box making over 1000 ft lbs of torque at the tires. Do you believe that?

So I am not saying they are not accurate, you just have to know what you are measuring.

The only way the hp should be off is if the dyno is uncalibrated or the curve or numbers were read off of the wrong gear. On a Mustang the formula they use is only accurate in a 1:1 scale. It does not compensate for gear ratio like the Dynojet does.

Other than that the hp numbers are totally within reason.

If someone thinks they read high then why were their trucks there actually making less than expected?