VCT 6 - improved breathing, loss of torque - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
¬Ľ Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Superchargers | Turbos | N2O
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 10-12-2003, 02:13   #1 (permalink)
Nice car. Driver's a pig.
 
Join Date: Oct 2003
Posts: 84
VCT 6 - improved breathing, loss of torque

I have a series III AU Fairmont Ghia, auto, with the VCT motor. About three weeks ago we added an SS air inlet, K&N filter, Genie manifold, flow thru cat, and a 2.5" ss cat-back system.

Right away it was a lot more torquey - more push below 3,000 rpm, extended top end on the freeway, and lots more fun to drive - even though it sounded like a Cessna. Over the next ten days it got better and better (the power, not the noise).

The idea was to let the factory computer adapt to the new hardware over a couple of weeks, dyno it, fit a Chiptorque chip, and then dyno it again to get a good appreciation of what difference the chip makes. So last week, the guys added an exhaust tip that hadnít arrived earlier, installed the chip, and noted a slight increase in torque and power on the dyno.

They also noted that where the existing factory moulded plastic ducting leaves the filter box, itís only 2" diameter. So they decided to help it to breathe a bit better. They found that if they disconnected the filter box and the 2" restriction, they could pick up an extra 8 rwhp. (but strangely, if they aimed the dyno blower into the pipe like Ďassistedí ventilation then it lost about 5rwhp). So we decided to fit 3" stainless from the filter box to the throttle body. The guys modded the filter box to remove the 2" restriction, so itís now a full 3" straight out, and I drove the car away without a dyno run Ďcause I had some work commitments that couldnít wait.

The car felt a bit ordinary at first. I thought it was maybe a change in the power curve, because there was no noticeable surge through the rev range like before. But now Iíve been driving it for a couple of days, (total about 6 hours of freeway and town driving) I know it is definitely down on torque. Itís flat and lifeless like it used to be before we started Ďimprovingí it.

Putting the Chiptorque chip aside for the moment, I would have thought that with the improvement in induction pressure and flow, there would be a noticeable increase in both power and torque. But maybe at low revs (2 - 3k where I want more torque) all that extra induction flow isnít needed. Would removing the 2" restriction on the induction side be responsible for lowering the torque? Or is this a rubbish idea?

Iíll drive it for another couple of weeks to let the computer re-train, and if it is still ordinary then weíll go back to the dyno with a) the existing set-up, b) with the original factory restricted air duct from filter box to throttle body, c) without the chip.

If anyone has any words of wisdom or understanding of what could be happening here, Iíd appreciate it. Where could the torque have gone? Where did the fun go? Will the car 'improve' over the next couple of weeks as the chip and the computer and the new engine hardware get to know each other?
Thanks
Porcus Noir

Last edited by the black pig; 10-12-2003 at 18:18.
the black pig is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-12-2003, 05:35   #2 (permalink)
Bourbon powered V8
 
JC-XR8's Avatar
 
Join Date: Sep 2002
Location: Canberra, Australia.
Posts: 4,787
Re: VCT 6 - improved breathing, loss of torque

Sounds like the chip to me.
__________________
__________________________


AU1 XR8 Auto 147.9 rwkw (approx 215 fwkw)

AU2 Wagon HAD Auto
17s, Pacemakers, 3" Intake & Pod filter (The Family Hack)

Member of:
FPV-XR Club ACT
AUFalcon.com
ATPS (honorary)
JC-XR8 is offline   Reply With Quote
Old 10-14-2003, 02:02   #3 (permalink)
Nice car. Driver's a pig.
 
Join Date: Oct 2003
Posts: 84
Re: VCT 6 - improved breathing, loss of torque

OK, thanks

I'll try that first - removing the chip - and see if I get my grunt back.

ta

darkmeat
__________________
AUIII Fairmont Ghia + AUII Fairmont SW + BF F6 Typhoon
the black pig is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Superchargers | Turbos | N2O



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need For Speed Hot Pursuit 2 shaft The Pub 36 12-01-2002 05:21
Ford reports $US326 million net loss for Q3 2002 RPO83 Ford Worldwide News 1 10-16-2002 06:09
BA Falcon Engine Reveal RPO83 Ford Worldwide News 0 09-04-2002 07:27
Super Duty's Improved Power Stroke Diesel Produces Best-in-class Torque LunaticSVT Diesel Tech 0 03-22-2002 21:31
Horsepower vs. Torque! Dan [Sac] Ford Probe Forum | Mazda MX6 Forum 3 12-17-2001 08:56

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 05:09.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.