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-   -   A good day at the dyno... (http://zr1.net/forum/showthread.php?t=28506)

Pete 11-14-2017 11:37 PM

Re: A good day at the dyno...
 
WOW,nice job:dancing
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. :fahne:
Pete

XfireZ51 11-14-2017 11:48 PM

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/

Top Toy 11-15-2017 08:34 PM

Re: A good day at the dyno...
 
Who's got some Dyno results from bone stock cars? Comparing those numbers to the factory eating (375 or 405) should give us a better idea of our driveline losses. My first Dyno run back in the day with cat back exhaust only was 363 RWHP. Guessing 350 RWHP bone stock. That would be about a 14% loss.

tiegsd 11-15-2017 08:40 PM

Re: A good day at the dyno...
 
Seems to me losses should be proportional to rpms. Might not be exact, but maybe good enough for govt work.

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Wide_One 11-17-2017 12:29 PM

Re: A good day at the dyno...
 
Quote:

Originally Posted by Top Toy (Post 270764)
Who's got some Dyno results from bone stock cars? Comparing those numbers to the factory eating (375 or 405) should give us a better idea of our driveline losses. My first Dyno run back in the day with cat back exhaust only was 363 RWHP. Guessing 350 RWHP bone stock. That would be about a 14% loss.


Here ya go, this is a stock California smog car with no cat backs. The time slips are not my best but consistent.

XfireZ51 11-17-2017 05:01 PM

Re: A good day at the dyno...
 
Pete and I were noodling this a bit, and based on typical trap speeds(~112mph) for stock LT5s for 375 hp motors, we figure motor is actually more like 400chp.
Typical chassis dyno results for stock 375hp motor have been ~ 330RWHP.
That's ~17-18% loss, so GM assumption appears to work out.
Makes you want to get your hands on those original dyno sheets.

LGAFF 11-17-2017 06:53 PM

Re: A good day at the dyno...
 
http://www.zr1.net/forum/showthread....ight=dyno+mods

Mystic ZR-1 11-17-2017 07:38 PM

Re: A good day at the dyno...
 
Quote:

Originally Posted by XfireZ51 (Post 270839)
....
Makes you want to get your hands on those original dyno sheets.

Perhaps a Christmas card to Betty at the NCM would help?

XfireZ51 11-17-2017 11:07 PM

Re: A good day at the dyno...
 
Here's a very good example of a stock 91 dyno. It was of a previous member Don Yoakem. 334rwhp

LGAFF 11-17-2017 11:11 PM

Re: A good day at the dyno...
 
Quote:

Originally Posted by XfireZ51 (Post 270850)
Here's a very good example of a stock 91 dyno. It was of a previous member Don Yoakem. 334rwhp


That's with flowmaster exhaust and possibly a tune...


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