sounds dumb and you can believe me or not. ok well the shop did my dyno but the graph didnt print. I have a pic on my cell phone of the Hp that i made. I did 3 pulls on MUSTANG DYNO. the best one was 202whp and 143tp. this was to the wheels. the guy said its about a 5% loss in power due to the load the dyno puts on the trans. Last weekend i ran my car on street tires. the run is in my sig.

What do you guys think??


Modified by Greg50Lt at 10:27 PM 4/24/2008

 

I think one of our dynos is drastically wrong. Being that I only made 180whp with I/RH on a Mustang Dyno as well.

And I KNOW there is no exhaust out there that creates and extra 20WHP on our Sis.

Then again 5% loss in power is extremely low for a Mustang Dyno since they are supposed to simulate real world conditions more accurately. That's why my shop factored a 18% to 22% loss on their vehicles(20% average).....and I saw several different dyno charts from different vehicles to see if they were actually telling the truth.

 

they said based on my tq it was abouta 5-8% loss. and no none of my dynos were wrong. first one was 193 second awas 196 then i hit 202. im not lieing. i mean i kno your dyno was 180 but your numbers were low IMO and i think a lot of ppls opinions.if you want the pic that i hace on my cell fone ill post it for you

 

I never said you were lying. I said our shops are callibrating the dynos differently.

Your mustang dyno is reading at or slightly above most Dynojet dynos.

Weird. But I still believe you though.

 

sorry i read what you rote again and saw that i read wrong. my bad but heres the pic anyways

 

Good numbers Greg

I got this pic when you sent it to me last night, thanks man.

 

That's sick.

 

wait. so you're getting this with just I/E or did i miss something?

nice work my friend.

 

I'm not going to bother doing the math here... but if you both used the same dyno, and one person is on 5% resistance, and the other person was on ~20% resistance... shouldnt that show that your cars are probably running within ~5-10hp of eachother in reality?

 

yea realalisticly. but we are roughly the same. i have a catback and he dosnt. jaeplam, i/e you missed RH but thanks. but they said that with the resistance out the car has about 210-215. The company said that average loss is 15%. this is mostly on higher tourque cars he said. he said i sould expect a 5-8% loss due to our cars being low tq. either way im happy. i cleared the 200 mark w/out the reflash. Thanks IT guy n/p and thanks Mario. If you still wanna meet up to hear it let me kno.

Thanks everyone for the compliments

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Greg50Lt &raquo;</TD></TR><TR><TD CLASS="quote">The company said that average loss is 15%. this is mostly on higher tourque cars he said. he said i sould expect a 5-8% loss due to our cars being low tq. </TD></TR></TABLE>

Negative. The resistance factors calculated into a true Mustang Dyno are un-biased towards high or low torque cars. They simulate real world conditions that affect these cars pretty much the same way.

The shop I went to had several different cars ranging from low torque (S2000, Integras) to High torque (Corvettes, Mustang Cobras).....all which lost relatively the same percentage of power to the wheels. There was never a drastic difference between the imports and domestics.

 

The general rule of thumb I've seen is 15% for FWD, 20% for RWD, and 25% for AWD

because the amount, location and size of driveline components matter. 2 halfshafts and an intermediate shaft attatched to a differential built into a tranny has much less loss than say 4 axles, 2 differentials and a driveshaft. RWD has a driveshaft that causes more loss than a FWD car without a driveshaft

 

or shops were the same b/c they did honda/acura and they vettes and cameros and ****. but they did comp. to the rwd V8 to and FWD 4cyc the 4cyc had less loss then the v8. IDK no real way to settle it but if i did have a 15% loss to the wheels that would mean that i am 232whp. im not so sure that my car is putting down that much. IDK the only thing that i can do is get it dynoed on a dynapack and see what i get and compare the diff. but RICO your shop said 18% loss and u made 180 so that means realistic you would hvae 212. thats about the same as mine with a 5% loss.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Greg50Lt &raquo;</TD></TR><TR><TD CLASS="quote"> but RICO your shop said 18% loss and u made 180 so that means realistic you would hvae 212. thats about the same as mine with a 5% loss. </TD></TR></TABLE>

Actually an 18% loss to put me at 180WHP would mean that I have 220HP at the flywheel.

A 5% loss to put you at 202WHP would mean that you only have 213HP at the flywheel.

How could you have LESS power when you have an exhaust and I don't???

Something's not right.

 

18%loss on your .18 times 180 is 32.4 which gives you 212.4hp. my 202 times .08 gives me 16.6 whicjh equals 218.1. my car has 6more hp. but if i had a 18 % loss it would be 202 times .18=36.6 so 238. is my math wrong?? Im serious thats how i was figureing it out lol. so.... check what i did and tell me what you think. i think it makes sense!?!?

i think that the way my car was calibrated it lost 5% so 218 and your car was calibarated diff so you got a 18% loss so 212. thats how im thinking rite now but how would they hae calibrated diff. its the same dyno? also my intake was modified to fit in the engine bay so its not the factory k&n but i dont see how that made a diff and the exhasut.

 

Negative....

18% of 220HP is 39.6.

220 - 39.6 = 180.4. Meaning I lost 18% of 220HP to land at 180WHP.

5% of 213HP is 10.65

213 - 10.65 = 202.35. Meaning you lost 5% of 213HP which put you at 202WHP.

Another way to do it would have been to divide .82 (the difference of 18%) into 180WHP. And .95 the difference of 5%) into 202WHP. Doing that gives you the same values rounded as stated above.

180WHP / .82 = 219.5HP

202WHP / .95 = 212.6HP

Your math was right....you're just multiplying into the wrong value. You have to multiply the percentage loss by the FLYWHEEL HP to find out what the loss to the wheels is....which is your final result.

Now lets say for ***** & giggles that we use my 18% loss into your WHP value.....then that would mean that your flywheel HP is 246 and some change. And there's no way you could pick up 49HP from I/RH/E boltons.

So that means one of our shops is using the incorrect percentage value in calculating the loss to the wheels.

Spooky!



Modified by RICO_ at 4:36 PM 4/25/2008

 

i guess your maht makes sense. and yea its nuts that the shops are differnt. but hey aw well. im almost positive no let me reprahe taht I GUARENTEE i dont have 246 to the fly. They use that dyno on there built k24 eg hatch and it gets in the 3's and runs a 11.2 so...
EDIT that shop can do nething with a honda/acura. they can even make K pro work in the SI. he offered to do it for me but its pricy. Im not even going to explain whathe has to do but imagine rewiring the whole car over again.

 

RICO idk i think that more ppl need to chime in specually some1 good in math to help us out. b/c if you find the diff one way tthen you should be able to do the oppisite and get what you started with. (kinda hard to understand but think about it)

 

I hear you. Now i'm not a genius....but I am pretty good in math and i'm almost positive that my way was the correct way of determining the actual flywheel HP.

Since I am losing 18% according to the shop then that means my car is actually only outputting 82% of it's potential.

82% of 220HP is..........180.4

My way has to be right.

But any math nerds that want to chime in feel free to do so to let us know which one of us is right.

Greg....I don't think your numbers are wrong.....I just think that the shop gave you the wrong information regarding the % loss that they factor into their results.

I think it may be slightly higher...probably closer to about an 11% loss to the wheels.....since that figure would put you at 227HP to the flywheel. Fairly modest since you have the benefit of an exhaust and I don't.


Modified by RICO_ at 5:13 PM 4/25/2008

 

RICO_ is right.
why dont you go to a shop with a dynojet so you can get accurate readings, and not have to guess whats actual and whats factual? you are paying these shops to do you this service, am I missing something here?

 

ok thanks so RICO what are my mnumbers. and the place to get the highest numbers is a Dynapack. but the lier free and best tunign is a mustang dyno.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Greg50Lt &raquo;</TD></TR><TR><TD CLASS="quote">ok thanks so RICO what are my mnumbers. and the place to get the highest numbers is a Dynapack. but the lier free and best tunign is a mustang dyno.</TD></TR></TABLE>

It's not where you can get the highest numbers......it's where you can get the most ACCURATE numbers. And typically that is supposed to be at a Mustang Dyno......but I wouldn't necessarily say that your shop qualifies given the ridiculously low power losses that they factor into their results.

And judging by the way they treated you prior to your arrival.....I would try to steer clear of them.

I don't doubt your car has slightly higher power than mine. I just think your shop did a few things wrong in producing the numbers.

 

yea. well time prior: they have a old lady as secretary and she was out sick and the other guy that works there was working on a customers camaro. but the guy that actuall puts the cars on the dyno and does the pulls is from a diff shop. hes the cool guy and gave me a few pointers on what to do my car. They are also friedns with teh guy that runs a 14.1 in a stock 4door. and hes a great driver let me tell you. but yea maybe after the reflash ill go and get antoher shop to do the pulls on a mustang dyno and see what they get.

 

How do you like you're K&N sri? Im thinking about getting one soon. Where did you pick it up from?

 

i picked my V1 up from a shop online a while ago but i ended up finding another one for like 50bucks on ebay so i bought that incase nething happend to mine. Its a good intake just i needed to cut it and now it fits perfect.