knock retard woo's:( - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 01-21-2007, 03:29 AM   #31
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Reader'* Digest version is that the new exhaust manifold on the front (Powerlog) is more efficient at removing exhaust, causing the front 3 cylinders to flow better and run leaner than the rear 3 cylinders. He needs 2% more fuel to the front cylinders to battle this condition and even out the air/fuel ratio in all 6 cylinders. Then the tune he applies in the PCM will affect all the cylinders in the desired manner because they're all burning the same A/F ratio.
big_news_1 is offline   Reply With Quote
Old 01-21-2007, 11:54 AM   #32
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

And after he does all that, he can start troubleshooting any KR that remains.

Discussing and troubleshooting KR on a car with a powerlog and no skew is pretty much pointless. It'* a known issue.
willwren is offline   Reply With Quote
Old 01-21-2007, 08:51 PM   #33
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

hey will would it be a good idea to upgrade to 42.5lb flow matched injectors or just stay with
the stockers?
GAMEOVER is offline   Reply With Quote
Old 01-21-2007, 09:17 PM   #34
Senior Member
True Car Nut
 
Join Date: Mar 2005
Posts: 2,688
Thanks: 0
Thanked 0 Times in 0 Posts
dillcc is on a distinguished road
Default

I'd stay with stockers. I HIGHLY doubt you're outflowing them with those mods. Flow matched stockers would be a better place to put your money.
dillcc is offline   Reply With Quote
Old 01-21-2007, 09:46 PM   #35
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

NO. Absolutely NOT. You're not ANYwhere near outflowing the stock injectors. You need to have your current PCM skewed for the front three injectors. Fix the car instead of introducing more variables.

Fix the KR via skew FIRST. Before anything else. Get the other KNOWN bugs in that PCM fixed at the same time. Don't do anything else until you do.
willwren is offline   Reply With Quote
Old 01-21-2007, 09:52 PM   #36
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

Quote:
Originally Posted by willwren
NO. Absolutely NOT. You're not ANYwhere near outflowing the stock injectors. You need to have your current PCM skewed for the front three injectors. Fix the car instead of introducing more variables.

Fix the KR via skew FIRST. Before anything else. Get the other KNOWN bugs in that PCM fixed at the same time. Don't do anything else until you do.
ok thanks
GAMEOVER is offline   Reply With Quote
Old 01-21-2007, 10:04 PM   #37
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

You have to remember there'* alot of guys here running 3.2" pulleys, headers, rockers, cams, etc. and are STILL running stock fuel pumps, FPR'*, and injectors.

#1 rule, don't introduce ANY other changes until you get it FIXED first, or we'll all be chasing our tails with you trying to nail this down. Nail it down as it sits, then we'll move forward from there.
willwren is offline   Reply With Quote
Old 01-21-2007, 11:09 PM   #38
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

Quote:
Originally Posted by willwren
You have to remember there'* alot of guys here running 3.2" pulleys, headers, rockers, cams, etc. and are STILL running stock fuel pumps, FPR'*, and injectors.

#1 rule, don't introduce ANY other changes until you get it FIXED first, or we'll all be chasing our tails with you trying to nail this down. Nail it down as it sits, then we'll move forward from there.
good point ill do that thanks for your input
GAMEOVER is offline   Reply With Quote
Old 01-21-2007, 11:37 PM   #39
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Quote:
Originally Posted by willwren
You have to remember there'* alot of guys here running 3.2" pulleys, headers, rockers, cams, etc. and are STILL running stock fuel pumps, FPR'*, and injectors.

#1 rule, don't introduce ANY other changes until you get it FIXED first, or we'll all be chasing our tails with you trying to nail this down. Nail it down as it sits, then we'll move forward from there.
Exactly. Don't fix what isn't broken, especially when there are more important issues that need to be addressed.

My '99 GT is a SOLID 12 second car, with traction it would be an 11 second car, and I am still on stock L67 injectors, and a weaker fuel pump than the supercharged guys.
dbtk2 is offline   Reply With Quote
Old 01-23-2007, 06:10 PM   #40
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

Quote:
Originally Posted by dbtk2
If your fuel trim is at -3.2 and you go WOT, it will lock in on -3.2 and will pull 3.2% fuel throughout your whole WOT run. This is obviously not good and can cause KR. This is the best way I can think to word it anyways. This can also cause inconsistant 02 readings from run to run and track passes and whatnot because one run it might be adding 5% fuel and the next one it might be pulling 5%.
While pretty close, this is not technically correct. The PCM does lock in the current LTFT when at WOT however it has other tables such as RPM vs. Time and the Power Enrichment table that add fuel to avoid being lean and supply the fuel needed as the motor heats up and revs faster.
Rogue is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Woo Woo!! Black Pearl Lounge 6 11-02-2009 08:06 PM
knock knock knock L27Buick 1992-1999 7 09-17-2004 04:23 PM
Knock Knock, engine knock? Spiral 1992-1999 5 05-23-2004 10:08 PM
What is Knock Retard? Wolfedog50 Performance, Brainstorming & Tuning 9 08-31-2003 09:45 PM
KNOCK RETARD Forced Induction 22 04-29-2003 01:36 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:11 AM.


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.