My #8 goes bye bye and who know's why - OP runs and hides

[Bmr4life]

Look what popped up today,

http://www.lonestarstangs.com/showthread.php?67420-96-12-sct-sf3-tuner-for-sale

Lol. And that price is way to high.

 

[UltraKla$$ic]

This thread

 

[pacettr]

Great thread. Will read again.

 

[NastyStang113]

Seer are you saying that the math always works out like that for torque and hp? Seems like the math rarely works out like that with the dyno graphs I've seen.

 

[302]

Seer are you saying that the math always works out like that for torque and hp?

I just did it with another formula and got pretty much the same thing he did. If you have RPM and HP and those are correct i do not see why the math would not always work.

EDIT: Also taking the same formula( HP=(TQ(n*m)(2pi)RPM)/33k gets you approximately the "norm" for his mods...

 

[NastyStang113]

Do you have a graph where it works out because I wasn't able to? Maybe I'm just doing it wrong. LOL

 

[pacettr]

Seer are you saying that the math always works out like that for torque and hp? Seems like the math rarely works out like that with the dyno graphs I've seen.

100% of the time. IIRC dynos measure tq and the use the formula to extrapolate hp (or vice-versa).

 

[WTFchuck]

i vote ultraklassic calls lund and reports back with why GjOnD knows why #8 is poppin bottles

 

[302]

Do you have a graph where it works out because I wasn't able to? Maybe I'm just doing it wrong. LOL

Are you converting the newton meters to pound feet? I came out with 534~ NM which approximates to 393 lb*ft

 

[NastyStang113]

Maybe I don't have the right formula. What's the formula if you're dealing with lb ft from a graph?

 

[pacettr]

Maybe I don't have the right formula. What's the formula if you're dealing with lb ft from a graph?

hp = (tq*rpm)/5252


note that at 5252 rpm hp and tq will ALWAYS be =

 

[302]

This is how i did it...

 

[Seer]

Seer are you saying that the math always works out like that for torque and hp? Seems like the math rarely works out like that with the dyno graphs I've seen.

ALWAYS... it's physics

 

[Seer]

This is how i did it...

I *feel* you are using the wrong HP number. You can't say peak torque at 4175 rpm = peak HP at 6275 rpm.

You have to look on the graph and state how much torque is needed to create the amount of HP at peak torque. At 4175 rpm, his car was making ~305 hp.

I'm using the formula: TQ = (HP*5252)/RPM

 

[302]

I *feel* you are using the wrong HP number. You can't say peak torque at 4175 rpm = peak HP at 6275 rpm.

You have to look on the graph and state how much torque is needed to create the amount of HP at peak torque. At 4175 rpm, his car was making ~305 hp.

I'm using the formula: TQ = (HP*5252)/RPM

I just used the information given from the dyno chart and plugged it into the formula. I assumed the HP@RPM=TQ@RPM all values being equal and given, and we all seem to agree the TQ numbers are off. But hey, we all passed algebra in high school...

 

[Seer]

I just used the information given from the dyno chart and plugged it into the formula. I assumed the HP@RPM=TQ@RPM all values being equal and given, and we all seem to agree the TQ numbers are off. But hey, we all passed algebra in high school...

it's not far off.. but that dyno is wonkey lol.

I had a run when I plugged in my ghost cam tune, that it shook the tach read off mid run, so for some odd reason it showed me making 415rwhp at 16,000 rpm. So, it couldn't give me an accurate TQ calc.

 

[NastyStang113]

Well that's why I was using the wrong RPM... I was never good at math in school. I always had a hot smart gf to do it. LOL

 

[pacettr]

it's not far off.. but that dyno is wonkey lol.

I had a run when I plugged in my ghost cam tune, that it shook the tach read off mid run, so for some odd reason it showed me making 415rwhp at 16,000 rpm. So, it couldn't give me an accurate TQ calc.

What's "wonkey" about it?

 

[Bmr4life]

What's "wonkey" about it?

??? We've been talking about whats wrong with it for the last 10+ posts. HP and TQ graphs do not correlate.

 

[stkjock]

wow the engineer geeks out in force!!