Quote:

---

These guys didn't have much luck on the chassis dyno

---

Quote:

---

411 rwhp.

They said a big converter like that will "hide" the true power numbers. I was told a tighter converter would show much bigger numbers on the dyno but could hurt et if I was not able to spool enough on the line.

---

Quote:

---

These guys didn't have much luck on the chassis dyno...

http://www.streetfire.net/video/fail-900hp-dyno_2181566.htm

---

Quote:

---

A dyno jet chassis dyno is a inertia dyno and thus measures power by rate of exceleration and engine RPM,(That is why you do the pull in high gear 1:1)

---

Quote:

---

Quote:

---

A dyno jet chassis dyno is a inertia dyno and thus measures power by rate of exceleration and engine RPM,(That is why you do the pull in high gear 1:1)

---

Any thoughts on the different of dynos and the type of tuning you can achieve.

The one with the 2 rollers (steady state?), I understand that you can hold a load at any given rpm and tune to that area

The one with the big roller (inertia?) would it extrapolate the data over the acceleration curve?

Are there benefits of one over the other
ie street/ strip (steady state)?
race car (inertia)
Carb versus Efi tuning?

I say tuning of an efi system on a 2 roller system dyno (street car) and there were able to hold load over a series of rpm ranges and adjust the timing/air-fuel for low to mid range and see immediate changes in #'s output.

This looked like a great system for a street strip car

Any thoughts?

---

Quote:

---

ya know AL I realy dont have faith in chassis dynos..I know I'll get flamed for what Im going to say but its thru experience that I have had..

one thing...who ever is going to do or does chassis dynoing had better know what they are doing...know the car first or whats in the engine like operating RPM...thats another key

we had the duster done when it had the 448 engine...we trusted the guy...were we wrong...he buzzed it up and said it was down on power from the year before...now how can this be...he changed jets and picked up some...then he adjusted the valves..and this is where it all went wrong..

he buzzed the engine so much...splitting my ear drums...like RPM I have never heard out of this engine...we were down on power so he popped the valve covers after he said he heard a noise inside while it was idleing...sure enough..spun bearings and now a slight vibration..

I pulled the engine to find a snapped rod and all sorts of internal damage...those were LY rods..told him they were...he buzzed that engine passed 8 grand...nice guy HUH??

I can see if the operator knows the engine or whats in it and knows how to tune...and has a good following..then I say fine...but I am still a firm believer on dynoing an engine after its been built to tune... and see how its all working together and to break it in...at least the bearings...and if its a flat tappet cam...

I know Im long here but that chassis dyno guy realy cost me a ton...and Im still Pissed..

---

Quote:

---

ya know AL I realy dont have faith in chassis dynos..I know I'll get flamed for what Im going to say but its thru experience that I have had..

one thing...who ever is going to do or does chassis dynoing had better know what they are doing...know the car first or whats in the engine like operating RPM...thats another key

we had the duster done when it had the 448 engine...we trusted the guy...were we wrong...he buzzed it up and said it was down on power from the year before...now how can this be...he changed jets and picked up some...then he adjusted the valves..and this is where it all went wrong..

he buzzed the engine so much...splitting my ear drums...like RPM I have never heard out of this engine...we were down on power so he popped the valve covers after he said he heard a noise inside while it was idleing...sure enough..spun bearings and now a slight vibration..

I pulled the engine to find a snapped rod and all sorts of internal damage...those were LY rods..told him they were...he buzzed that engine passed 8 grand...nice guy HUH??

I can see if the operator knows the engine or whats in it and knows how to tune...and has a good following..then I say fine...but I am still a firm believer on dynoing an engine after its been built to tune... and see how its all working together and to break it in...at least the bearings...and if its a flat tappet cam...

I know Im long here but that chassis dyno guy realy cost me a ton...and Im still Pissed..

---

I've only been on a chassis dyno once and after it
was strapped down and the sensors were in place...
the first thing out of the operators mouth was....
what do you want to turn it to

Quote:

---

the time i did it i was sitting in the car controling the rpm,s

---

I forgot I did it twice... once on the Woodward cruise...
they asked if I would display and run on the dyno...
in that one I was behind the wheel... but the second
time a operator ran it with me standing there

Quote:

---

ya know AL I realy dont have faith in chassis dynos..

he buzzed the engine so much...
I pulled the engine to find a snapped rod and all sorts of internal damage...those were LY rods..told him they were...he buzzed that engine passed 8 grand...nice guy HUH??

---

Quote:

---

Quote:

---

ya know AL I realy dont have faith in chassis dynos..

he buzzed the engine so much...
I pulled the engine to find a snapped rod and all sorts of internal damage...those were LY rods..told him they were...he buzzed that engine passed 8 grand...nice guy HUH??

---

C'mon now, you had bad operator not the dynos fault!


First question is always what's done to the engine and how high do you want to take it. If its a new tune we always do pulls in 500rpm steps after 6K to see where it falls off without going past. As for where they make HP you can tell when the car isn't making power and you should pull your foot out of it.


Maybe this topic should have been titled *Chassis Dyno operators!*

---

Quote:

---

the guy that did mine was a very arrogant owner/operator...I even told him that I would like to be in the car..he wouldnt hear of it..said insurance reasons..

I know AL would never let that happen..

---