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#11 |
![]() Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,680
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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
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'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 |
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#12 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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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/
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#13 |
![]() Join Date: Jul 2012
Location: Allentown, PA
Posts: 309
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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.
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'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. |
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#14 |
![]() Join Date: Jul 2017
Location: West Chester, PA
Posts: 378
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Seems to me losses should be proportional to rpms. Might not be exact, but maybe good enough for govt work.
Sent from my SM-N920V using ZR-1 Net Registry mobile app
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1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold) ![]() |
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#15 | |
![]() Join Date: Dec 2004
Location: San Ramon Ca
Posts: 32
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Here ya go, this is a stock California smog car with no cat backs. The time slips are not my best but consistent. Last edited by Wide_One; 07-22-2018 at 07:23 PM. |
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#16 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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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.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#17 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#18 |
![]() Join Date: Jan 2010
Location: Mystic CT
Posts: 2,622
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#19 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Here's a very good example of a stock 91 dyno. It was of a previous member Don Yoakem. 334rwhp
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 03-08-2024 at 02:10 PM. |
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#20 | |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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That's with flowmaster exhaust and possibly a tune...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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