Whats up guys looking for some feedback.
Current mods on 06 6mt coupe are
z-tube/jwt popcharger
MD 5/16 spacer n Mrev2
Titek Test Pipe
HKS True Dual Exhaust

My wheel set-up is Work T1's on stretched tires. 9.5 front on 225/35/20 and 10.5 rear on 255/35/20. Alignment was done and im at -2.8 camber and toe is .13..Everything was centered and in the green.
I went with HP Logic and on their Mustang dyno i baselined 244 rwhp and and 212 torque.. After the Osiris I jumped to 252 and 218 torque. The gains were less than I expected but then again it is a Mustang dyno.. Im wondering with all my mods how much performance am I losing with my wheel/tire set-up? Im also slammed on tein flex coils. I just figured my car would've done a lot better than what it ran. Are my wheel/tire set-up killing my hp that bad or is this about the average for an 06 with my current mods? I run synthetic oil and 93 gas only.. Any feedback or advice is greatly appreciated. Thanks

 

Do some research on "unsprung weight" or "unsprung mass" and "rotational mass"...

 

umm okay, not sure as to why ur posting pics of ur car... Dunno what that has to do with the question i asked.

 

lol to make you feel better

my stock no rev up made 200. on the mustang. i almost cried.

 

lol yea i know mustang dyno is tuff...
Still wondering if I should switch to stock 19s cuz ive seen others with similar set-up and are over 260+...

 

well ive always heard if u got big wheels then ur losing about 15% on the dyno

 

Bigger the wheels, slower the car. Heavier the wheels slower the car. Stretchier tires, you know what I am getting at.

Although I am not sure you will notice anything on the dyno as the dyno is tracking your hp by how fast it gets your wheels around not how fast it grabs pavement and gets moving.... I'm not really sure though. Try slapping on your OEMs and see if you get higher numbers.

Maybe one of the tuning gods can shed some light...

 

Mike if you are hung up on the number, strap it down to a DJ and see what it makes. All dynos are different, and need calibration.

 

Well the numbers were alright.. Just kinda hung up on the gain from the Osiris tune which was like 8 hp n 6 torque.. Thought was gonna be more.. I guess now im wondering about my wheel set-up. How much im losing cuz of it compared to my stock oems.

 

Like suggested above, I think the easiet way to find out about how much power you're losing (if any) with your wheels, is to just dyno with them, change to your oem 19"s and then dyno again.

But even if the numbers dont show any changes, you're going from decently light to bigger and heavier wheels, so they're obviously going to affect your performance on the street. That's the price you have to pay for looking good, haha.

 

changing to oem 19s number will improved u gotta think the numbers are rwhp and of course heavy wheels take faster to turn ur wheels are more than likely 50 pounds heavier than stock add about 10% to 15% to ur numbers now and thats where u stand

 

^ No chance in hell that changing from his wheels now will yeild him 10 -15% on the reading of his numbers. The fact that they did a baseline with the same wheels and then osiris tune with the same wheels, means the wheels are a constant. The reading is correct the fact you are not happy with the power increase/tune is directly correlated to the tuner.

 

One needs the weight to tell. And the 255-55-20 is larger than oem. But Goblin is right. If the wheels/tires were on for both dynos, it's a constant.

 

Aite, but my gains is that normal for an Osiris tune? Is that the average gain on a Mustang dyno? Not sure if im unhappy.. It is a Mustang dyno but just figured it would've read way better. Can't say im disappointed with em cuz i have nothing to compare it to.