318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Induction

Notices

Induction Superchargers, NO2 and turbos.

.
» Recent Threads
1999 M-Sport For Sale
12-31-2023 05:10 PM
Last post by Coop540iT
03-23-2024 06:39 PM
1 Replies, 95,369 Views
Once again 318ti owner...
03-20-2024 12:39 PM
Last post by two30grain
03-22-2024 02:04 PM
1 Replies, 58,256 Views
What brakes do I...
03-20-2024 03:27 PM
Last post by huirtera
03-20-2024 03:27 PM
0 Replies, 55,739 Views
M50+manual swap bastard...
03-01-2024 11:00 PM
Last post by Andy318
03-18-2024 02:34 PM
3 Replies, 130,531 Views
Reply Share/Bookmark
 
Thread Tools Display Modes
Old 07-05-2005, 05:44 PM   #1
DustenT
doesn't care about you.
 
DustenT's Avatar
 
Join Date: Aug 2004
Location: Denver, CO
Posts: 3,925
iTrader: (0)
Question stock m44 injector size?

Anyone know what size the stock fuel injectors are on a m44? Is it possible to put bigger ones in?
__________________

'99 Dinan M3
DustenT is offline   Reply With Quote
Old 07-05-2005, 07:11 PM   #2
DustenT
doesn't care about you.
 
DustenT's Avatar
 
Join Date: Aug 2004
Location: Denver, CO
Posts: 3,925
iTrader: (0)
Default

bump, sorry I'm impatient.
__________________

'99 Dinan M3
DustenT is offline   Reply With Quote
Old 07-05-2005, 09:47 PM   #3
ZeroG
I miss my Ti....... :(
 
ZeroG's Avatar
 
Join Date: Nov 2003
Location: Los Angeles, CA
Posts: 828
iTrader: (1)
Default

Quote:
Originally Posted by DustenT
Anyone know what size the stock fuel injectors are on a m44? Is it possible to put bigger ones in?
If I recall correctly the stock injectors are 15 Or 16 Lbs/Hr. Could you put bigger ones sure, you will need adapters as most injectors are not air shrowded like the M42 and M44.

Why would you want to put a bigger injector? For my power? If you do you will need a piggyback unit to control the fuel. If you don't use one the LTFT's and STFT's will trim out any gain that you got.

-Chad
__________________
http://www.kodakgallery.com/PhotoVie...d=216155210106
"The faster you go, the sooner you get there"
ZeroG is offline   Reply With Quote
Old 07-05-2005, 10:28 PM   #4
DustenT
doesn't care about you.
 
DustenT's Avatar
 
Join Date: Aug 2004
Location: Denver, CO
Posts: 3,925
iTrader: (0)
Default

Quote:
Originally Posted by ZeroG
If I recall correctly the stock injectors are 15 Or 16 Lbs/Hr. Could you put bigger ones sure, you will need adapters as most injectors are not air shrowded like the M42 and M44.

Why would you want to put a bigger injector? For my power? If you do you will need a piggyback unit to control the fuel. If you don't use one the LTFT's and STFT's will trim out any gain that you got.

-Chad
Now I'm confused, someone on the .net list said they were 19 lbs/hr. What is the advantage of the "air shrowded" injectors? On NickG's upgrade, the replacement injectors don't use the shrowd.

What the heck is LTFT's and STFT's? Excuse my ignorance, I can't fit anymore acronyms in my brain!!!
__________________

'99 Dinan M3
DustenT is offline   Reply With Quote
Old 07-06-2005, 02:07 AM   #5
ZeroG
I miss my Ti....... :(
 
ZeroG's Avatar
 
Join Date: Nov 2003
Location: Los Angeles, CA
Posts: 828
iTrader: (1)
Default

Quote:
Originally Posted by DustenT
Now I'm confused, someone on the .net list said they were 19 lbs/hr. What is the advantage of the "air shrowded" injectors? On NickG's upgrade, the replacement injectors don't use the shrowd.

What the heck is LTFT's and STFT's? Excuse my ignorance, I can't fit anymore acronyms in my brain!!!
I am not sure about the injector flow rating it was just a number that I reacall. As far as I know air shrowded in jector assist with the CARB/SMOG qualifications. It bypasses air from the throttle body so that the engine can idle. It works along with the ICV (Idle Control Valve).

As for STFT & LTFT.

STFT = Short Term Fuel Trim

LTFT= Long Term Fuel Trim

The LTFT and STFT assist with the way the ECU runs the car. While the car is being driven at <WOT the car is running in what is called closed loop, where the ECU tried to keep the Air/Fuel ratio at 14.7. Optimum for power and fuel economy. When the car goes >=WOT the car is in what is called open loop and runs off a predetermined fuel map.

If you add larger injectors the car will be running rich when it should be running 14.7, and the ECU will got to the fuel map look up table calculate a leaner value and replace the old value in the table there for making the car run at 14.7 with the bigger injector. With the ECU leaning the LTFT and STFT when you go WOT in turn you will run leaner as well.

-Chad
__________________
http://www.kodakgallery.com/PhotoVie...d=216155210106
"The faster you go, the sooner you get there"
ZeroG is offline   Reply With Quote
Old 07-11-2005, 09:20 AM   #6
sabbath130
Junior Member
 
Join Date: Jun 2005
Location: nj
Posts: 11
iTrader: (0)
Default semi-related question...

i am currently running a full supersprint exhaust system( headers, racing resonator, and cat-back)

what effect does that setup have on my car as far as lean/rich goes (no cat)? performance?

what effect will it have when its supercharged...?
sabbath130 is offline   Reply With Quote
Old 07-12-2005, 02:05 AM   #7
ClubSport
Senior Member
 
Join Date: Jan 2004
Location: Fort Collins, CO
Posts: 290
iTrader: (0)
Default

Quote:
Originally Posted by sabbath130
i am currently running a full supersprint exhaust system( headers, racing resonator, and cat-back)

what effect does that setup have on my car as far as lean/rich goes (no cat)? performance?

what effect will it have when its supercharged...?
1. Probably none. You computer will automatically compensate for any increased airflow the exhaust allows, and add more fuel. Will probably increase performance a little.

2. That's what the RRFPR is for. It keeps compensating with more fuel, past the limits of the stock computer.
ClubSport is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Fog Delete Panels, 2007 A/C compressor, M3 Black leather boots RidingSimple US and North America 1 11-20-2008 06:29 PM
license plate delete b.u.ti-ful US and North America 10 12-07-2007 09:03 PM
OBDII EWS delete mooseheadm5 Engine Swaps 12 03-28-2007 08:30 PM
LICENSE PLATE DELETE YourNameHere US and North America 1 12-06-2006 07:36 PM


All times are GMT +1. The time now is 09:53 AM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2024, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 83.39 k/98.21 k (15.10%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.