SAE targets like 77 degrees and a different pressure. So whether you dyno in winter or summer, high or low altitude, with the same car, same mods, you should read the same. Std targets 60 degrees and a higher pressure. So you're always going to read a higher number. Based off of drag racing trap speeds, we've all pretty much come to a conclusion std is incorrect because if you could produce those numbers you'd of trapped better than you did.

So if I dyno 288whp on a mustang then dyno 320 on a dynojet with the exact same car. Go out an run it depending on how the car performs lets say trap speed, it'll determine which of those two dynos was more accurate with horsepower? And if so, then which dyno according to people who have DONE this, has been more accurate in reading horsepower according to their performance? Mustang or dyno?

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Mustang Dyno are known to be heart breakers and there are a ton of variables to take into account on the Mustang Dyno settings. I have a tread titled Mustang Dyno and you will see that I had 274 whp & 220 torque in the beginning and a week later (almost 30 degree drop in temp, several hundred more miles on the mods) I had 298 whp & 248 torque.

There are a lot of factors to take into account when getting a dyno: the dyno itself, weather, gas (type/make), tire traction, ECU accustom to the mods, and extra. I think you will be in the range of my beginning & end whp/torque on the Mustang Dyno possibly. At the end of the day are you satisfied with what was done and can you tell a difference after the fact. I notice that you did not mention this nor did anyone ask this, but you have a tune/or going to get a tune?

Half of those mods have been installed. The other half will be installed along with a tune. The car currently has no uprev tune and will be getting one.

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All right cool. After the tune put several hundred more miles and depending on the cost for a retune & the weather, I would recommend possibly getting a retune and you will more than likely see a difference.

On a mustang dyno, I am guessing you'll put down 302 without a tune and 312-318 with a tune

Correct. Dynojet with SAE.

See someone messed with the settings.

Weather will not change a dyno set to SAE or STD. It recalculates whatever temp you're at and spits out the numbers based on if you were dynoing in 77 degrees or 60 degrees. Only uncorrected will you see the temp diff.

Gas on a NA car will do nothing. The chance of knock is very slim with a good tune so you'll see no difference.

Lol tire traction on a sub 250tq car is no issue. I've seen traction issues on 1200hp GTRs though.

There's no such thing as ecu accommodations. When you tune a car you flash the ecu and dyno. Flash, dyno, flash, dyno. The ecu is set to what its set at. You don't finish a tune and miraculously gain power the next day because the ecu decided to change itself. This is a myth. I've tuned enough and checked power enough day to day to prove this. If anything you lose power. Like when you get a CEL from test pipes after a few miles after a reset. The ecu is continually seeing things are not going right so it richens the mixture then boom, CEL. Now depending on the type of CEL, a hard or soft CEL, the ecu will dump a ton of fuel or just a little. Point is you lost power from it. Once the MAF fuel curve is set, its set. You can drive all day everyday and watch the MAF scale and it will not change. WOT is also not like closed loop within the ecu. WOT is what we're talking about here on a dyno and trust me, once you set it, its set! Your driving around having the ecu "accommodate" for mods is doing nothing for the open loop map settings.

So what did it do?

It gets dynoed today. The pulley was not installed. They couldn't get it to budge AT ALL. They would have had to remove the entire front which would also add time and money. I dont think at this point that a pulley is worth that effort. So ill be getting dynoed with longtube intakes, full exhaust, high flow pipes, and headers. Ill post up

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looking for numbers, Will be right around 320 WHP :)

I wanna start out by saying that these guys are 1st class. Treated my like family and took care of any problems that they ran across. Good, reliable, and Fast workers. They have definitely earned my trust. Keith is a VERY down to earth guy and a perfectionist at that. Always great to have a guy with this attitude work on any car! I'd recommend AWDTuning to any guy here. Check them out!

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Good for you , I'm impressed!

Forgot to mention this was at about 60 degree weather.

For a NA car you should be happy!