A good day at the dyno... - ZR-1 Net Registry Forums

Top Toy · 11-14-2017

So, Todd, your results suggest that driveline loss is closer to a fixed number (approximately 50 for our cars?) rather than a percentage of FWHP. Correct? Awesome numbers, btw!

Pete · 11-14-2017

WOW,nice job

I just have a couple questions since you don't have corrected numbers then maybe you should dyno in the summer on a 100 degree day with 100% Humidity and tell us what the numbers are on that day.
This is why we have corrected.

Dennis,something is going on with the fuel or wideband?

Show me your 1/4 MPH i'll tell you your corrected WHP.

Pete

XfireZ51 · 11-14-2017

Very interesting article on parasitic losses. I don’t believe u can have a fixed loss # regardless of power. More power=more heat which = greater loss. Plus there’s a difference between steady state and one where u are constantly accelerating which is typical for chassis dyno.
Not disputing Todd’s observations, but I gotta think GM has seen enough of this stuff to make an “educated” guess.

Anyway, here’s a good read.

http://www.superstreetonline.com/how...in-power-loss/

11-14-2017	#1
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 308	Re: A good day at the dyno... So, Todd, your results suggest that driveline loss is closer to a fixed number (approximately 50 for our cars?) rather than a percentage of FWHP. Correct? Awesome numbers, btw! __________________ '95 ZR-1, aqua/gray, #167 368 LPE/Haibeck, Web cams, Stainless Works headers, B&B Fusion exhaust, 18" Fikse wheels, Alcon brakes, lowered. 491 SAE RWHP.

11-14-2017	#2
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,667	Re: A good day at the dyno... WOW,nice job I just have a couple questions since you don't have corrected numbers then maybe you should dyno in the summer on a 100 degree day with 100% Humidity and tell us what the numbers are on that day. This is why we have corrected. Dennis,something is going on with the fuel or wideband? Show me your 1/4 MPH i'll tell you your corrected WHP. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

11-14-2017	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: A good day at the dyno... Very interesting article on parasitic losses. I don’t believe u can have a fixed loss # regardless of power. More power=more heat which = greater loss. Plus there’s a difference between steady state and one where u are constantly accelerating which is typical for chassis dyno. Not disputing Todd’s observations, but I gotta think GM has seen enough of this stuff to make an “educated” guess. Anyway, here’s a good read. http://www.superstreetonline.com/how...in-power-loss/