Knight Fire Scan Results - 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 06-19-2005, 04:45 PM   #31
Senior Member
True Car Nut
Thread Starter
 
Join Date: Dec 2002
Location: Halifax, Canada 91SSE / 97SSEi
Posts: 5,857
Thanks: 0
Thanked 0 Times in 0 Posts
Merlin 91/97 is on a distinguished road
Default

Quote:
Originally Posted by willwren
How many pounds are the Series 2 injectors?
36 I believe
Merlin 91/97 is offline   Reply With Quote
Old 06-19-2005, 04:51 PM   #32
Senior Member
True Car Nut
 
Join Date: Feb 2003
Location: Bloomington-Normal, IL 1997 SE
Posts: 3,734
Thanks: 0
Thanked 0 Times in 0 Posts
macho_mike21 is on a distinguished road
Default

hmm, you would think new injectors would have been part of the performance package you got.
macho_mike21 is offline   Reply With Quote
Old 06-19-2005, 04:55 PM   #33
Senior Member
True Car Nut
Thread Starter
 
Join Date: Dec 2002
Location: Halifax, Canada 91SSE / 97SSEi
Posts: 5,857
Thanks: 0
Thanked 0 Times in 0 Posts
Merlin 91/97 is on a distinguished road
Default

Quote:
Originally Posted by macho_mike21
hmm, you would think new injectors would have been part of the performance package you got.
Normally it'* safe to run the stock injectors with as low as a 3.0 pulley.
No one thought that they'd be maxed with a 3.2 pulley.
Merlin 91/97 is offline   Reply With Quote
Old 06-19-2005, 05:38 PM   #34
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

It may be the case, but I still have my doubts that your injectors are causing you to run lean. I know the duty cycle is showing they're maxed, but it just sounds odd that my 30# injectors will support 400hp, and you're maxed out. Are you running too rich?
willwren is offline   Reply With Quote
Old 06-20-2005, 12:50 PM   #35
Senior Member
True Car Nut
Thread Starter
 
Join Date: Dec 2002
Location: Halifax, Canada 91SSE / 97SSEi
Posts: 5,857
Thanks: 0
Thanked 0 Times in 0 Posts
Merlin 91/97 is on a distinguished road
Default

Could a bad fuel pump or a dirty fuel filter be the cause?

We hooked up a gague to the fuel system today.... it was reading 40psi during idle, with a quick burst it went upto 60psi.
We replaced the fuel filter and it went up to 43psi during idle, with a quick burst it went upto 65psi.
Merlin 91/97 is offline   Reply With Quote
Old 06-20-2005, 01:37 PM   #36
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

I don't think its the injectors either. My dad went 12.78 and was running a 2.76 pulley on his stock injectors before they were maxed out. Usually you have to go under a 3.0 pulley at least before you have problems. 36lb. injectors can flow a lot of fuel.

Quote:
I know the duty cycle is showing they're maxed, but it just sounds odd that my 30# injectors will support 400hp, and you're maxed out.
You also have to remember that our engines are supercharged when you are thinking about the hp level that injectors max out at. While the engine might be making 400hp, it is probably using 80hp of that to turn the blower, so you are only seeing 320 of those ponies, but the engine is actually putting out more than that.



Shawn
dbtk2 is offline   Reply With Quote
Old 06-20-2005, 01:51 PM   #37
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

The PCM will command the injectors to open longer (pulse width) to make up the fuel it needs to get the right AF mix. If your injectors are unable to keep up then 2 things can be wrong. The injectors themselves may just not be able to flow enough fuel or, your fuel pressure is low and so the PCM has them opening longer to compensate. You may want to get a fuel pressure gauge and check it at WOT to see pressure. It may be that you can get a new or better pump or regulator to up the pressure and you would see your injectors calm down.
Rogue is offline   Reply With Quote
Old 06-22-2005, 12:14 AM   #38
Senior Member
Posts like a Corvette
 
Join Date: Jan 2004
Location: Montréal, QC
Posts: 1,374
Thanks: 0
Thanked 0 Times in 0 Posts
Foghorn is on a distinguished road
Default

Hmmm...

No doubt the fuel system bears further srcutiny. Good move to change the filter though, but still there'* cause to think you have a bit of a fuel supply problem. I know the Grand Prixs have a fuel pump pump resistor and 2 pump relays (low & high speed), maybe the Bonneville is similar, I've seen plenty of GPs with pump related problems.

On the other hand, your O2 values versus IPW are interesting;

20.17 977
20.48 981
19.94 972
20.13 955
20.39 946
20.72 938
21.03 929
20.94 929
21.23 924
21.41 920

Initially your O2s are rich, starting at 977, yet the IPW is 20 which has shown to be tolerable. As time passes your O2 gets leaner, into the range it should be, yet the IPW is rising...meaning the fuel delivery system can't keep up.

Also, how are you getting the reading of 16 psi for the boost? There are 2 reasons to suspect this reading;

1) The MAP sensors are limited to 2 bar which means they shouldn't read that high. Try swapping around the MAP connectors, there are 2 of them mounted side by side, one is used by the PCM and the other is used by the guage.
2) The PCM will become confused at boost readings over 2 bar.

Let us know...

Cheers,
Foghorn is offline   Reply With Quote
Old 06-22-2005, 12:25 AM   #39
Senior Member
True Car Nut
Thread Starter
 
Join Date: Dec 2002
Location: Halifax, Canada 91SSE / 97SSEi
Posts: 5,857
Thanks: 0
Thanked 0 Times in 0 Posts
Merlin 91/97 is on a distinguished road
Default

Quote:
Originally Posted by Foghorn
No doubt the fuel system bears further srcutiny. Good move to change the filter though, but still there'* cause to think you have a bit of a fuel supply problem. I know the Grand Prixs have a fuel pump pump resistor and 2 pump relays (low & high speed), maybe the Bonneville is similar, I've seen plenty of GPs with pump related problems.
Yes the Bonneville has the 2 speed settings for the fuel pump too...... it'* the next thing on the list to replace.

Quote:
Originally Posted by Foghorn
Also, how are you getting the reading of 16 psi for the boost? There are 2 reasons to suspect this reading;
Mechanical gauges....

Quote:
Originally Posted by Foghorn
1) The MAP sensors are limited to 2 bar which means they shouldn't read that high. Try swapping around the MAP connectors, there are 2 of them mounted side by side, one is used by the PCM and the other is used by the guage.
2) The PCM will become confused at boost readings over 2 bar.
What do you mean by "bar" and "2 bar"?
.... and where are the MAP sensors again? hehe
Merlin 91/97 is offline   Reply With Quote
Old 06-22-2005, 01:01 AM   #40
Senior Member
True Car Nut
 
Join Date: Feb 2003
Location: Bloomington-Normal, IL 1997 SE
Posts: 3,734
Thanks: 0
Thanked 0 Times in 0 Posts
macho_mike21 is on a distinguished road
Default

bar is a measure of atmospheric pressure.
Dictonary.com says:
"A unit of pressure equal to one million (10^6) dynes per square centimeter."

That help?
macho_mike21 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Knight Fire Scan Results from the 1/4 Mile Merlin 91/97 Performance, Brainstorming & Tuning 7 07-12-2005 10:32 PM
Knight Fire - Just tuned my car, now she really peels (DSL) Merlin 91/97 Your Ride: GM Pictures & Videos 33 06-01-2004 07:13 PM
Knight Fire at the Airport (56k Warning) Merlin 91/97 Your Ride: GM Pictures & Videos 12 02-16-2004 01:49 PM
Knight Fire @ Dusk.... Merlin 91/97 Your Ride: GM Pictures & Videos 18 01-06-2004 11:39 AM
New Years Day 2004: Knight Fire (56k Warning) Merlin 91/97 Your Ride: GM Pictures & Videos 7 01-02-2004 03:55 PM


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 09:25 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.