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 2 of 2 1 2
 
Thread Tools Display Modes
  #11  
Old 10-22-2008, 07:47 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
No problem. Jason from Montana. Just got car home Friday, just short of a year! It left last Nov.6th but he did it right so after all the time no real complaints!
__________________
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
  #12  
Old 10-26-2008, 04:42 AM
Eric Eric is offline
Junior Member
  
Join Date: Oct 2008
Posts: 1
Default
Jason,
Shoot me an email or something and I'll see if I can help.
Get an idea of what the BLM's and O2's are doing when the flat spot occurs.

Regards,
Eric
__________________
Eric Marshall
TurboTweak
Reply With Quote
  #13  
Old 10-26-2008, 12:25 PM
JCotton1's Avatar
JCotton1 JCotton1 is offline
Married Man
  
Join Date: Nov 2007
Location: Paradise
Posts: 1,434
Default
Welcome Eric, thanks for helping. I am tickled pink to have you participate here. Jason, Eric is not one of the best, he is the BEST Chip maker in the buick world!!!
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #14  
Old 11-18-2008, 08:16 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
He y guys. I'm taking it to the dyno tomorrow so I'll let you know how it turns out and what the readings are.
__________________
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
  #15  
Old 11-19-2008, 01:09 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
He y guys. I'm taking it to the dyno tomorrow so I'll let you know how it turns out and what the readings are.
We be waiting... good luck
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #16  
Old 11-26-2008, 12:24 AM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
Didn't run as I'd expected. 360HP/360TQ 15lbs. boost at 15* timing at 5200 RPM the car broke up. Last night I pulled the plugs and re gaped them to .030(they were at .035) and reset timing to 18*. Not sure how much difference this will make... What kind of RPM range should be the cut off point?? I thought ATLEAST 5800??? I NEED TUNING HELP!!!!!!
__________________
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
  #17  
Old 11-26-2008, 02:00 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
Didn't run as I'd expected. 360HP/360TQ 15lbs. boost at 15* timing at 5200 RPM the car broke up. Last night I pulled the plugs and re gaped them to .030(they were at .035) and reset timing to 18*. Not sure how much difference this will make... What kind of RPM range should be the cut off point?? I thought ATLEAST 5800??? I NEED TUNING HELP!!!!!!
not bad............ for starters.. You definitely need to step up the timing, are you running pump gas, alky? At 15lbs, I would typically run somewhere around 20 plus timing.. with a FAST.. could you see if you were rich or lean? You should be able to pull 5800.. you'll need it. I usually set the plugs around a tight 32..
__________________
Jack Cotton
Cottons Performance
413-789-0531
Reply With Quote
  #18  
Old 11-26-2008, 07:23 PM
IATEAV8 IATEAV8 is offline
Member
  
Join Date: Mar 2008
Location: Bozeman
Posts: 30
Default
No alky. Pump gas chip for 91 octane. I was thinking of having Eric burn me a second chip for 116 octane that has more aggressive timing??? Numbers all look good car goes a little rich at boost. It's pulling straight up until 5200RPM then everything just goes haywire. Any thoughts on why the car would break up like that? I HOPE it's from the plug gap and lack of timing???? Believe you me, I definitely want a FAST just trying to keep my wife along the way!!!! (She actually gets it)
__________________
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
  #19  
Old 11-27-2008, 02:16 AM
WSLN 6 WSLN 6 is offline
Member
  
Join Date: Aug 2008
Location: Saskatoon, Canada
Posts: 46
Default
Tried swapping coil/module yet? I doubt it is the plug gap, not sure if the low timing would cause that or not.
__________________
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
  #20  
Old 11-27-2008, 12:42 PM
BrianHynes's Avatar
BrianHynes BrianHynes is offline
Nitro boy
  
Join Date: Dec 2007
Location: Northern New York
Posts: 732
Default
Just a thought here. Are your valve springs correct for your cam, and are they set up correctly?
__________________
'86 Gn with an RPE bullet. Almost everything else is from Cottons. 100% street car!
Reply With Quote
Reply
Page 2 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 05:34 AM.

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

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