Fordmods Logo

WILL 20'S AFFECT MY DYNO READING 

 

Page 3 of 3 [ 36 posts ] Go to page Previous  1, 2, 3

 
Posted: Mon May 19, 2008 3:14 am 
Getting Side Ways
Offline
User avatar

Age: 37

Posts: 1063

Joined: 22nd Aug 2006

Gallery: 20 images

Ride: FG XR8, F6 F6 ute, XR5T, Capri

Location: Perth
WA, Australia

update on the 295s on dyno
ended up running with them

the gearbox shat itself lol (auto)

made a pathetic 257rwhp @ 5000rpm and 500Nm @ 1450rpm
Top
 Profile  
 
 
Posted: Mon May 19, 2008 11:06 am 
Getting Side Ways
Offline
User avatar

Age: 41

Posts: 10829

Joined: 17th Apr 2005

Gallery: 34 images

Ride: BF MK11 XR 6 TURBO ZF 6spd

Power: 225 rwkw

Location: glenwood/sydney
NSW, Australia

Tocchi wrote:
update on the 295s on dyno
ended up running with them

the gearbox shat itself lol (auto)

made a pathetic 257rwhp @ 5000rpm and 500Nm @ 1450rpm
sad to hear... what box you going to do now? upgrade btr??
Top
 Profile  
 
 
Posted: Mon May 19, 2008 11:11 am 
Getting Side Ways
Offline

Posts: 6113

Joined: 8th May 2007

fordfreak ef wrote:
Tocchi wrote:
update on the 295s on dyno
ended up running with them

the gearbox shat itself lol (auto)

made a pathetic 257rwhp @ 5000rpm and 500Nm @ 1450rpm
sad to hear... what box you going to do now? upgrade btr??


i think he's going a T5
Top
 Profile  
 
 
Posted: Mon May 19, 2008 11:23 am 
Getting Side Ways
Offline
User avatar

Age: 41

Posts: 10829

Joined: 17th Apr 2005

Gallery: 34 images

Ride: BF MK11 XR 6 TURBO ZF 6spd

Power: 225 rwkw

Location: glenwood/sydney
NSW, Australia

t5 are not as strong as the BTr's.. but i guess one could always upgrade the T5.. a t5 driven sensibly can last awhile.. even behind boosted applications if driven with care...
Top
 Profile  
 
 
Posted: Tue Sep 02, 2008 8:51 am 
Oompa Loompa
Offline

Posts: 35

Joined: 25th Aug 2008

Location: Grafton
NSW, Australia

Rim size has nothing to do with it , it's the rolling circumference that will alter the figures . 20's would have a low profile tyre fitted that would have a similar height to the standard wheels that came on the car . Unless the Dyno guy's are uploading the "actual" rolling circumference of the tyres you are paying for a lie . The rollers are measuring twisting torque transmitted by the wheels , cars need to be tested in direct 1-1 . A set of 4-1 diff gears will give a huge output figure compared with a set of 3-1 gears in the same car . That's why 3.55-1 ratio diff gears are used for towing and 2.78-1 ratio for cruising and economy , it's all about twisting torque .
Top
 Profile  
 
 
Posted: Tue Oct 21, 2008 10:08 pm 
Getting Side Ways
Offline

Age: 49

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

BigCav wrote:
4dlvr wrote:
according to my physics teacher the torque curve will drop but the peak kw number should slightly increase


your teacher is sadly mistaken and should go back to uni i think.

agreed

Quote:
however at the treads where a dyno is reading the motors not physically making any more power at the motor because of big wheels is it.

u can dyno tune your car in first gear or in 5th gear u will get the same rwkw, so what would changing the rolling circumfrence do, absoluty nothing as its the same thing as different gearing.

agreed

Quote:
u will lose power with those 20's, not because ratio's and speeds have changed but because you have greater rolling resistance due to the additional weight in the wheels.

The added weight of bigger wheels as a proportion of the whole car is small, and therefore so too is the potential increase in rolling resistance. The rolling resistance may not actually increase or may reduce due to bigger wheels having a tendency towards a lower rolling resistance.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 3 of 3  [ 36 posts ]  Go to page Previous  1, 2, 3

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Sat Mar 30, 2024 1:39 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names