Just to let you guys know, today it was proven on the dyno that wheel size affects hp. We have a Type-r @ the shop and dyno'd with 17" wheels and then with 15" wheels and the car gained an average of 15hp @ the wheels...........we dyno'd more than once to correct for errors.............

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Comptech exhaust
Comptech springs
custom air intake
18x7.5 Alstadts w/ 53mm offset
225/40/18 Kumho Ecsta Supras
153mph Top Speed
193hp @ the wheels

 

umm...im not sure i understand. you make a car lighter and it gets more horsepower? i understand if your car gets faster with smaller wheels because there is less inertia to spin from a standstill. so going from 5 passengers to 1 will increase horsepower too? hehe...not sure what wheels have to do with the engine.

TLracr

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Dark Emerald Pearl 2000 3.2 TL with Nav, Sebring Mufflers, Sebring Quad Sport Exhaust System, Factory Spoiler, HP Quantum Mirror Tint, 6 Disc Alpine CD changer, 16" 139C Pacer wheels, yokohama 215/55/16s, PIAA 1700x
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http://www.stanford.edu/~sevan9

 

Lighter whls will not increase overall HP of the engine ("at the fly(wheel)") but will increase the HP that the car can deliver to the ground. The HP "at the wheels" is what is usually checked by a dyno, although you could dismount the engine and put it on a stand to see HP at the fly.

So, lighter whls will spin easier, and therefore allow you to apply more HP to the whls. More specifically, you can put more TORQUE down to the whls with lighter whls. HP is just a mathematical derivative of torque. Torque is the stuff that makes your car jump off the line, and is what most people are referring to when talking about power. Torque=twist, HP=work.

But extra 15HP at the wheels? Man, the price of looking good just got higher! I'm assuming that the 17s were heavier...

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'01 pearlescent white TL
Wing, tint and cop-finder.
'88 White RX-7 Convertible
Permanent tinitus courtesy of Rockford-Fosgate.

 

i guess its worth that extra several hundred dollars to get forged aluminum instead of casts.

 

By experience, I know that wheel offset will affect HP!!!
So, correct offset is very crucial!!

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1999 Dark Emerald Pearl TL w/ nav
Factory underbody kit and rear spoiler.
Comptech springs, sways, headers and exhaust.
RS Akimoto Funnel Ram III Intake.
18x7.5 +48 5Zigen Heidfeld wheels with 225/40ZR18 Nitto NT-555 tires. Mounted with chrome McGard Spline Drive nuts.
Inspire Tail-lights with Polarg M-23 P8711R signal bulbs.
DEI Viper 550ESP Alarm
http://home.socal.rr.com/tada/socal28TL.htm

 

I'm going to assume that the overall diameters were different between the two rim-tire combinations. Otherwise I find it hard to swallow!

 

I'm pretty sure they were not different by much.

 

215/40/17's........and 205/50/15's and the 17" wheels were Niche Shocking Shoks, and the 15's were custom BBS race wheels

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Comptech exhaust
Comptech springs
custom air intake
18x7.5 Alstadts w/ 53mm offset
225/40/18 Kumho Ecsta Supras
153mph Top Speed
193hp @ the wheels

 

do you know the difference in weight?

 

Niche shocking shocks are much heavier wheels if memory serves me correctly.

 

Whoa whoa, I'm confused...you gained more horsepower with 17's or 15's?
Ed

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'99 TL Satin Silver/Ebony, Non/Nav, Comptech lowered, Comptech Air Filter Element, Inspire Tails, AEM Brake Pads all around

Pics of my TL
Pics of my Miata! Wadya think?

 

There must be a huge difference in weight btw the two sets of wheels!

 

Big time.........

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Comptech exhaust
Comptech springs
custom air intake
18x7.5 Alstadts w/ 53mm offset
225/40/18 Kumho Ecsta Supras
Plastic on grill color matched
153mph Top Speed
193hp @ the wheels

 

Wow! That is really awesome! Do you guys know if the Accord EX Alloy wheels are lighter than the Accord LX steel rims? I was always wondering my car dyno'd stock at 155hp when most people were telling me I should have gotten closer to 160hp.

Yet another reason to get the Racing Hart CP-035's!

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Brian =B-)
2000 Accord LX V6 Sedan White - 3,310 lbs w/ driver - 170HP & 160ft/lbs
- Eibach Pro-Kit (1.5" drop)
- Red AEM Short RAM Intake (8-10hp & 5-6 ft/lbs gain on a DynoJet)
- Red AEM Tru Power Pulleys (10hp @ 5,600rpms & 11ft/lbs @ 4,600rpms gain on a DynoJet)
- 15.45 @ 88.8mph (Track) [with AEM intake/pulleys] 0-60mph 7.2 sec (G-Tech) [with intake/pulleys]