TEAM COTTON'S PERFORMANCE TURBO BUICK ONLINE FORUMS  

Go Back   TEAM COTTON'S PERFORMANCE TURBO BUICK ONLINE FORUMS > Technical Forums > Engine Tech
Reload this Page Low end flat spot
Register FAQ Community Calendar Today's Posts Search

Engine Tech A great place to get info related to V6 engines, cams, pistons, heads... etc.

Reply
Page 1 of 2 1 2
 
Thread Tools Display Modes
  #1  
Old 10-20-2008, 05:55 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default Low end flat spot
I've got a pretty bad flat spot at the low end. The car idles at about 900 and drives well once your up in the rpm's a little bit. Any thoughts?
__________________
1987 Turbo T Limited with leather. Girdled, stroked, GTK 850, 79 lbs. injectors, ATR headers & DP Comp 212/212 Roller Cam, Diamond Pistons, TCI TH 400
Reply With Quote
  #2  
Old 10-20-2008, 08:56 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
Scan tool reads the car is going lean
__________________
1987 Turbo T Limited with leather. Girdled, stroked, GTK 850, 79 lbs. injectors, ATR headers & DP Comp 212/212 Roller Cam, Diamond Pistons, TCI TH 400
Reply With Quote
  #3  
Old 10-21-2008, 04:47 PM
JCotton1's Avatar
JCotton1 JCotton1 is offline
Married Man
  
Join Date: Nov 2007
Location: Paradise
Posts: 1,434
Default
Quote:
Originally Posted by IATEAV8 View Post
Scan tool reads the car is going lean
I take it you are using a chip.. a little detail please..
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #4  
Old 10-21-2008, 05:23 PM
WSLN 6 WSLN 6 is offline
Member
  
Join Date: Aug 2008
Location: Saskatoon, Canada
Posts: 46
Default
Is this a tip in problem, or after that? If in the lower end is acceleration enrichment coming in, or Power enrichment not coming in early enough? TPS flat spot maybe?
__________________
1986 T-Type
Leather/column
What turbo?
Powerstroke IC, Forged Stroker,GN 1's,Razor alky, XFI, 3.5" DP, Extrm stg2 tranny,TA Headers
PTC 9.5 N/L 3400 stall
Reply With Quote
  #5  
Old 10-21-2008, 07:55 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
Turbo tweak chip with 79 lbs injectors 3 1/2 inch MAF car runs super after initial start. If you leave with a heavy foot its fine, but, if your just "driving" it falls on its face then takes off at about 2000 rpm's.
__________________
1987 Turbo T Limited with leather. Girdled, stroked, GTK 850, 79 lbs. injectors, ATR headers & DP Comp 212/212 Roller Cam, Diamond Pistons, TCI TH 400
Reply With Quote
  #6  
Old 10-21-2008, 09:07 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
TPS is .48 idle and 4.6 wot.
__________________
1987 Turbo T Limited with leather. Girdled, stroked, GTK 850, 79 lbs. injectors, ATR headers & DP Comp 212/212 Roller Cam, Diamond Pistons, TCI TH 400
Last edited by IATEAV8; 10-21-2008 at 09:15 PM.
Reply With Quote
  #7  
Old 10-22-2008, 06:29 PM
JCotton1's Avatar
JCotton1 JCotton1 is offline
Married Man
  
Join Date: Nov 2007
Location: Paradise
Posts: 1,434
Default
Quote:
Originally Posted by IATEAV8 View Post
TPS is .48 idle and 4.6 wot.

Where is your IAC counts at idle.. you may lower them down to 5-15 counts at idle by opening your throttle blade a little, that may help.... after that.. looks like a FAST XFI.... will take care of ALLLL YOUR ISSUES..
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #8  
Old 10-22-2008, 06:40 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
Boy O boy! I knew that one was coming! Thanks for the "quick fix" remedy. How much for all I'd need? (FAST) Also, are they pretty easy to learn? There is only one other Turbo Buick guy here so kinda tough to get competent help out here! Thanks for the turbo though! I LOVE IT!!!!!!! Once the little tweaks are done....
__________________
1987 Turbo T Limited with leather. Girdled, stroked, GTK 850, 79 lbs. injectors, ATR headers & DP Comp 212/212 Roller Cam, Diamond Pistons, TCI TH 400
Reply With Quote
  #9  
Old 10-22-2008, 07:01 PM
JCotton1's Avatar
JCotton1 JCotton1 is offline
Married Man
  
Join Date: Nov 2007
Location: Paradise
Posts: 1,434
Default
Quote:
Originally Posted by IATEAV8 View Post
Boy O boy! I knew that one was coming! Thanks for the "quick fix" remedy. How much for all I'd need? (FAST) Also, are they pretty easy to learn? There is only one other Turbo Buick guy here so kinda tough to get competent help out here! Thanks for the turbo though! I LOVE IT!!!!!!! Once the little tweaks are done....
Hehehe.. couldn't resist it, anytime I see a big turbo and a lot of other good parts..... seems the best form of tuning and performance is the FAST. Chips, big injectors are like water and oil to me. But I will try to help any way I can. I meant it about the IAC counts. If it is an off idle hesitation... we usually work the min idle screw and open the throttle blade till our idle IAC counts are around 10, give or take a few.. then reset the TPS to spec, around 42-46.. after that, if everything else checks out, maybe Eric at TT can work some magic.. on the chip.
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #10  
Old 10-22-2008, 07:02 PM
JCotton1's Avatar
JCotton1 JCotton1 is offline
Married Man
  
Join Date: Nov 2007
Location: Paradise
Posts: 1,434
Default
Oh ya.. I forget who this is...? I know I should know, short memory... just turned 55..
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
Reply
Page 1 of 2 1 2

Bookmarks

« Previous Thread | Next Thread »

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


All times are GMT. The time now is 09:29 AM.

Contact Us - Cotton's Performance Center Forum - Archive - Top

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.