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Contour Enthusiasts Group Archives Forums General Dyno and Drag Anyone know dyno loss going from 16 to 17 rims?

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Re: Anyone know dyno loss going from 16 to 17 rims? #580894 03/21/03 09:50 PM
Joined: Feb 2003 Posts: 23 Somerset Pa C CMAC New CEG\'er
CMAC New CEG\'er C Joined: Feb 2003 Posts: 23 Somerset Pa	If you run a lower profile tire and the outside diameter of the tires(16vs17)is the same, shouldn't the output at the wheels be the same or higher with whichever wheel/tire combo is lighter overall?Just a thought. 2000 Contour SE,All stock and lots a fun,But I have plans

Re: Anyone know dyno loss going from 16 to 17 rims? #580895 03/21/03 10:19 PM
Joined: Nov 2002 Posts: 3,506 San jose, Ca R Roz 1999 SVT-C Hard-core CEG'er
Roz 1999 SVT-C Hard-core CEG'er R Joined: Nov 2002 Posts: 3,506 San jose, Ca	You have to factor in weight too....and how the weight is disributed between the tires and rims....and what your asking about best combo, do you want peoples opinions??? Reason i ask is becasue i think most of the people here use a different tire and rims brand ( ok maybe just different rims). Roz 3.0 SVT hybrid...all the fixens...Track/Race ready very soon!!!!!! 20,000 + miles

Re: Anyone know dyno loss going from 16 to 17 rims? #580896 03/22/03 11:00 PM
Joined: Aug 2002 Posts: 208 Mountain Top, PA E ezsvt OP CEG\'er
OP ezsvt CEG\'er E Joined: Aug 2002 Posts: 208 Mountain Top, PA	Interestingly enough, I changed my tires today to the 17s, and weighed both sets of tires/rims. The SVT 16" w/Blizzak Tires were 40 pounds each The SSR 17" w/Firehawk SZ-50EPs were 35 pounds each. For me 5 pounds less per wheel, I think the numbers might stack up ok for the dyno. 00 SVT Contour: SHM LT headers, LSD, Spec Stg 3...dyno:190.3whp sold 02/04 04 Subaru Baja Turbo 5-spd 00 Camaro SS 393cid: 510rwhp/469rwtq, 11.16 @ 124.95(hit 1-2 limiter) www.erikz.org

Re: Anyone know dyno loss going from 16 to 17 rims? #580897 03/23/03 12:55 AM
Joined: Mar 2001 Posts: 464 The land of B18s T TheGSRGuy_dup2 CEG\'er
TheGSRGuy_dup2 CEG\'er T Joined: Mar 2001 Posts: 464 The land of B18s	Find a Dynapack dynamometer. The dyno attaches directly to the hub and therefore any suspension and wheel problems are not shown in the dyno. They are rather rare though. Dan Acura Integra GS-R w/mods Former owner of a 95 SE

Re: Anyone know dyno loss going from 16 to 17 rims? #580898 03/23/03 01:09 AM
Joined: May 2000 Posts: 15 Rockford, Michigan N ngm_dup1 New CEG\'er
ngm_dup1 New CEG\'er N Joined: May 2000 Posts: 15 Rockford, Michigan	Take a look at the Tirerack article in the latest edition of "Grassroots Motorsports". The writer details pros & cons using a Mazda Miata and going from 13" to 15" wheels. For now, I'll keep my 15" wheels on my ES and focus on higher performance tires. Nathan

Re: Anyone know dyno loss going from 16 to 17 rims? #580899 03/23/03 02:39 PM
Joined: Mar 2003 Posts: 22 D DanN_dup1 New CEG\'er
DanN_dup1 New CEG\'er D Joined: Mar 2003 Posts: 22	Originally posted by ezsvt: The SVT 16" w/Blizzak Tires were 40 pounds each The SSR 17" w/Firehawk SZ-50EPs were 35 pounds each. For me 5 pounds less per wheel, I think the numbers might stack up ok for the dyno. Even with the same tire diameter, bigger wheels (or wider) will cause a loss of wheel HP (what you measure on a chassis dyno) BECAUSE THEY MOVE WEIGHT/MASS FARTHER FROM THE AXIS OF ROTATION. Even if the weight is the same, it will have require more inertial force to move..that is more torque (and thus HP, because they relate directly). This will increase "driveline" losses. In ezsvt's case, I would guess that the 5 lb weight loss would probably make things about even between 16 & 17s...I would guess no power loss. SSRs are amoung the lightest..very nice choice. 1999 Amazon Green SVT A few mods...179.2 FWHP so far

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