Tires affecting dyno numbers?

Reply Subscribe

Thread Tools

Search this Thread

Sep 4, 2002 | 04:47 PM

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Tires affecting dyno numbers?

How much will changing tires affect dyno numbers? I.E. from 195-55-15 to 205-50-15.

Sep 4, 2002 | 04:51 PM

uNF$@#!

Honda-Tech Member

Joined: Jan 2000

Posts: 9,684

Likes: 1

Re: Tires affecting dyno numbers? (B2FiNiTY)

friction + extra weight = more rotational mass.

you planning to dyno?

Sep 4, 2002 | 04:53 PM

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (Soup ****)

Yeah...I might wanna hold off on the tires until after the dyno day,

Sep 4, 2002 | 04:53 PM

Cosworth

Honda-Tech Member

Joined: May 2001

Posts: 6,402

Likes: 0

From: Fairbanks

Re: Tires affecting dyno numbers? (B2FiNiTY)

so negligible that it's nothing to worry about.

It'd be one thing if your wheels + tires weighed 40lbs each.

Sep 4, 2002 | 05:05 PM

disordeR

Member

Joined: Jul 2001

Posts: 2,809

Likes: 0

From: CA, usa

Re: Tires affecting dyno numbers? (Soup ****)

tire pressure affect it?

Sep 4, 2002 | 05:11 PM

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (disordeR)

Tire pressure will. I believe the higher the pressure the higher the numbers.

Sep 4, 2002 | 05:13 PM

Cosworth

Honda-Tech Member

Joined: May 2001

Posts: 6,402

Likes: 0

From: Fairbanks

Re: Tires affecting dyno numbers? (B2FiNiTY)

Quote:

Tire pressure will. I believe the higher the pressure the higher the numbers.

wth?!

Trending Topics

1999 Civic D15Z6 - spark plug colors? high HC on emissions

6

202
Help with flasher relay

9

418
Any tiips on how to remove electrical connectors from their mount?

2

132
new to me 99 accord

14

818
94-97 jdm accord black housing headlight bulbs?

3

5.3k

Sep 4, 2002 | 05:15 PM

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (Cosworth)

The key is less resistance.

Sep 4, 2002 | 05:16 PM

ActiveAero

Paragraph Alert

Joined: Mar 2001

Posts: 5,575

Likes: 2

From: Oil rig, middle of the ocean

Re: Tires affecting dyno numbers? (B2FiNiTY)

Quote:

Tire pressure will. I believe the higher the pressure the higher the numbers.

That's probably only true if you go from like 5psi to 35psi. Any reasonable psi would probably be unnoticeable.

Sep 4, 2002 | 05:20 PM

#10

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (ActiveAero Ninja Edition)

True. But does anyone have info on tire sizes or weights?

Sep 4, 2002 | 05:41 PM

#11

jond

Honda-Tech Member

Joined: Oct 2000

Posts: 4,406

Likes: 0

From: Brooklyn, NY

Re: Tires affecting dyno numbers? (B2FiNiTY)

You can figure the diameter here:
http://robrobinette.com/tire_diameter.htm

The 205s will be somewhat smaller

Sep 4, 2002 | 05:45 PM

#12

jond

Honda-Tech Member

Joined: Oct 2000

Posts: 4,406

Likes: 0

From: Brooklyn, NY

Re: Tires affecting dyno numbers? (jond)

This doesn't have the same widths, but you can see that going from 185 to 195 is between 2-3lbs.

Thus around 8whp you would lose with the 205s?

http://www.miata.net/faq/tire_weights.html

[Modified by jond, 9:45 PM 9/4/2002]

Sep 4, 2002 | 05:57 PM

#13

rainmanEK

big strong guy

Joined: Feb 2002

Posts: 3,455

Likes: 0

From: LUTZ, fl, usa

Re: Tires affecting dyno numbers? (4MATIC)

Quote:

yah its weird..but when ever I get some new tires. I feel a loss of power

its because the extra grip!!!

Sep 4, 2002 | 06:11 PM

#14

TypeR 599

Honda-Tech Member

Joined: Oct 2001

Posts: 9,342

Likes: 0

From: So., Ca.

Re: Tires affecting dyno numbers? (B2FiNiTY)

D...no matter what you're still going to dyno low

Sep 4, 2002 | 06:40 PM

#15

Driver

Honda-Tech Member

Joined: Jun 2001

Posts: 173

Likes: 0

Re: Tires affecting dyno numbers? (jond)

Quote:

So if I dynoed at 170.4 with the 205's I should be close to 178 whp with the 195's ??? Or am I dreaming

Sep 5, 2002 | 05:32 AM

#16

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (01-1214)

I'll just dyno with the new tires. Numbers aren't really all that important.

Sep 5, 2002 | 06:40 AM

#17

Flux

Honda-Tech Member

Joined: Dec 2000

Posts: 5,108

Likes: 0

From: Denver, CO, USA

Re: Tires affecting dyno numbers? (B2FiNiTY)

You guys are Dyno ******...

Sep 5, 2002 | 07:14 AM

#18

newt2

INSERT TITLE HERE

Joined: Jan 2000

Posts: 1,600

Likes: 0

From: Littleton, CO, USA

Re: Tires affecting dyno numbers? (B2FiNiTY)

Size won't matter but weight will.

Dynos can calculate your effective gear ratio from the rpm count on your engine and the rpm of the roller.

Sep 5, 2002 | 07:18 AM

#19

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (newt2)

Too late now...going to change out the tires today. Maybe I'll put down less than stock numbers

Sep 5, 2002 | 08:04 AM

#20

B2FiNiTY

Thread Starter

Honda-Tech Member

iTrader: (2)

Joined: Mar 2001

Posts: 38,367

Likes: 1

Re: Tires affecting dyno numbers? (B2FiNiTY)

The tires are 3 lbs more than stock. What's the formula for calculating how much hp difference?

Reply Subscribe

Related Topics

Thread

Thread Starter

Forum

Replies

Last Post

Tires for dyno....

FastechAccord

Drag Racing

May 13, 2018 05:43 PM

Tires for dyno?

Steeve_Civic

Drag Racing

Aug 30, 2014 02:56 PM

need tips for good dyno results tomorrow

pho:20

All Motor / Naturally Aspirated

Feb 22, 2006 09:34 PM

(Warning: Noob Q) Dyno Results?

DeusXmachina

Tech / Misc

Jun 17, 2004 01:35 PM