Welcome to the North American Subaru Impreza Owners Club Thursday October 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 09-21-2007, 12:48 PM   #1
redrex2002
Scooby Specialist
 
Member#: 118915
Join Date: Jun 2006
Chapter/Region: Tri-State
Location: Rochester, NY
Vehicle:
2002 wrx
srp

Default flat torque curve?

hey guys this is the best place i could thing of to put this. but what i am wondering is, i have read a coupple times on these boards about people with flat torque curves. what i am wondering is why that is a good thing i would figure that you would want your torque curve to increase as much as possible to help keep power up top? if someone can explain this to me that would be great.
* Registered users of the site do not see these ads.
redrex2002 is offline   Reply With Quote
Old 09-21-2007, 12:53 PM   #2
bboy
Scooby Specialist
 
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

A flat torque curve will net a linear HP curve, the car is very controlled and has a wide power band. Cars don't naturally have flat torque across the RPMs, but they can be tuned to.

This is a tuning question not a built motor one.
bboy is offline   Reply With Quote
Old 09-21-2007, 12:57 PM   #3
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

it actually more a of built motor question than tuning one...the only way to really correct it as far as tuning goes is to have a constantly increasing boost pressure after hitting peak VE...the added boost will then try to keep the VE's at the same level...
so really, for the most part, comes into intake and exhaust manifold tuning, ports, turbo sizing, cams and rod ratio...
what you choose here makes all the difference to how that torque curve will look...tuning can only correct a little.

A flat torque curve will help to maintain a steady acceleration rate and allow for more driveability.

have you ever driven a car where it pulls hard down low and then starts to feel sluggish towards the top end? that is the torque curve falling off...real engine builders, racers and tuners, who know what to look for, read the torque curve, and not the hp curve, as it directly (nearly) relates to exactly what the engine is doing.

Last edited by Homemade WRX; 09-21-2007 at 01:10 PM.
Homemade WRX is offline   Reply With Quote
Old 09-21-2007, 03:52 PM   #4
Jeremy@Cobb
Scooby Newbie
 
Member#: 106514
Join Date: Feb 2006
Default

Camshafts and headporting have the most to do with this for Subaru's, tuning also has some effect.

This is really ideal for a road coarse, constantly in and out of gears and fluctating rpm's.

With a broad torque curve the car will be more predictable.
two cars equal, except differnt power bands
1- Having 500ftlbs for 1500-2000 rpms
vs
2- Having 500ftlbs for 3000+ rpms

On a road coarse the second car has the advantage.

It is more likely for the second car to be pushing more power at all times, in and out of turns with rpms fluctuating.

- J.
Jeremy@Cobb is offline   Reply With Quote
Old 09-21-2007, 07:45 PM   #5
redrex2002
Scooby Specialist
 
Member#: 118915
Join Date: Jun 2006
Chapter/Region: Tri-State
Location: Rochester, NY
Vehicle:
2002 wrx
srp

Default

thanks for the responses that helped alot
redrex2002 is offline   Reply With Quote
Old 09-21-2007, 10:25 PM   #6
Blueghost6789
Scooby Newbie
 
Member#: 159900
Join Date: Sep 2007
Default sa

sa sa sa
Blueghost6789 is offline   Reply With Quote
Old 09-21-2007, 11:50 PM   #7
modaddict
Scooby Guru
 
Member#: 95840
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Pasco, WA
Vehicle:
sold to a good bud
awaiting next car

Default

I want a flat torque curve
modaddict is offline   Reply With Quote
Old 09-22-2007, 01:28 AM   #8
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

Quote:
Originally Posted by modaddict View Post
I want a flat torque curve
well, I'm trying to make a big, flat torque curve
had a small on already...flat from 3500-7000...was quite nice
Homemade WRX is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Flat torque curve antonch Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 29 09-21-2009 01:27 AM
anybody have a flat torque curve on thier dyno map? wagonmasta Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 42 12-20-2006 03:14 PM
Hunting for Idle? Flats Spots in Torque Curve? Costas Normally Aspirated Powertrain 0 08-23-2003 09:42 PM
What's the best Kit for flat-high power/torque curves? ngenear Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 2 07-08-2002 10:10 AM
('93-'01) Graph of horsepower/torque curve for phase I 2.5L? 2.5GT Impreza Forum 3 06-08-2001 12:00 AM


All times are GMT -4. The time now is 01:31 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.