Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists

New Supercharged 1990 GT Results

 
Old 10-22-2004, 04:56 PM
  #76  
John..
User
 
Join Date: Nov 2001
Location: Northern Kentucky
Posts: 1,447
Default

Yes Tim, it should. Maybe we should all quit while ahead before one of us has "An Unfortunate Schmelting Accident"...sorry but my wife bought me the Goldmember DVD for Sweetest day (she got roses and a card). I think I have already picked the name for the TT 32 valver...any guesses? Now if UPS would deliver the pistons the conveniently lost on the last shipment I would be able to get something done this weekend...The Audi needs work anyway so I'll do that instead.

What say ye, 16-18 psig on that sweet 4 valve combustion chamber? Sounds like 5.0 liters of forced induced fury to me!
John.. is offline  
Old 10-22-2004, 04:57 PM
  #77  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 11,982
Default

Originally Posted by Old & New
...""Squiggles" can be cause by a few things, such as timing, detonation, rear tire imbalance and even air flow issues.
No new information there.
With extreme jaggedness, you can perform a coast down/negative horsepower test to rule out any rear tire imbalance.
Well, at least we have one new way to gather more data.

However, he's confirmed for us that all the items I suspected can lead to the squigglies.
worf928 is offline  
Old 10-25-2004, 11:16 PM
  #78  
Carl Fausett
Developer
Rennlist Member


Rennlist
Site Sponsor

Thread Starter
 
Carl Fausett's Avatar
 
Join Date: Dec 2001
Location: Horicon, WI
Posts: 6,589
Default

Old & New - yes - we did notice an out-of-balance condition that was quite obvious. The car really shook especially above 90 mph. We reported it to the owner. He hasd beautiful new aftermarket wheels and tires - but of course - had instructed the installers to only put the wheel weights on the inside so as not to ugly-up the alloys on the side we all see. You can rarely get a whell/tire combo in dynamic balance that way.
__________________
Questions? Tech Support?
Call 920-485-0928
International 001-920-485-0928
Email: [email protected]
Website: https://928motorsports.com/
Instructions: http://www.928motorsports.com/install.php


Carl Fausett is online now  
Old 10-25-2004, 11:27 PM
  #79  
Old & New
User
 
Join Date: Dec 2002
Location: Southern New England
Posts: 1,974
Default

It sounds like we may have the answer, then...!
Old & New is offline  
Old 10-25-2004, 11:33 PM
  #80  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 11,982
Default

Originally Posted by Old & New
It sounds like we may have the answer, then...!
One very probable means of producing a squiggly. RPM measurement noise is still high on my list of probables for things we cannot see,feel,and hear when we're watching a pull.

O&N? Any new news from the DJ folks? Carl?
worf928 is offline  
Old 10-26-2004, 02:38 AM
  #81  
Old & New
User
 
Join Date: Dec 2002
Location: Southern New England
Posts: 1,974
Default

Just what I posted above. I'll pick the brain of the operator next dyno session.
Old & New is offline  
Old 10-27-2004, 06:58 PM
  #82  
Mattman928
Addict
Rennlist Member
 
Mattman928's Avatar
 
Join Date: Mar 2003
Location: Falls Church, VA
Posts: 300
Default

I think the 4th gear pull will give more accurate profile of the power curve, since the increased sample per cycle will better define the curve.

The dip may simple be the exhaust harmonics. As the gas flow hits resonance there may be a little backpressure.
Mattman928 is offline  
Old 10-27-2004, 10:15 PM
  #83  
worf928
Addict
Rennlist Member
 
worf928's Avatar
 
Join Date: Oct 2003
Location: New England
Posts: 11,982
Default

Carl, how did you determine that the knock sensors were not singing?
worf928 is offline  
 


Thread Tools
Search this Thread
Quick Reply: New Supercharged 1990 GT Results


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: