direct injection - LS1TECH

Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Advanced Engineering Tech
Sign in using an external account
Register Forgot Password?
Search


Advanced Engineering Tech
For the more hardcore LS1TECH residents
Sponsored by
Whipple Super Chargers

direct injection

Reply
 
Thread Tools Search this Thread
Old 10-15-2011, 06:07 PM   #1
TECH Senior Member
 
garygnu's Avatar
 
Trader Rating: 0
Join Date: Feb 2009
Posts: 5,377
Send a message via Yahoo to garygnu
Default direct injection

how much does direct injection help with boosting an engine ?
__________________
2000 WS6,346,TFS 220,fast92/92,EPS cam,A4, CIR-D 3600 stall,3.25 9"Moser,BMR,UMI,SPHOON.MONEY PIT 3.
garygnu is offline   Reply With Quote
Old 10-16-2011, 10:33 AM   #2
DMM
TECH Fanatic
 
DMM's Avatar
 
Trader Rating: 0
Join Date: Jul 2010
Location: Maryland
Posts: 1,671
Default

With direct injection, the fuel can be injected after the compression stroke, immediately before ignition preventing detonation.
DMM is offline   Reply With Quote
Old 10-16-2011, 10:45 AM   #3
FormerVendor
 
Trader Rating: 0
Join Date: Jul 2008
Posts: 77
Default

I am by far the last person to ask in regards to if direct injection is the best, but I thought I might pass along some info. The turbo Mazda's are having a real problem when modified for higher boost levels with direct injection. It seems that they are finding the intake air stream has a huge effect on if the fuel makes it to the spark gap. When boosting at higher cfm and pressure levels they claim that things change quite a bit.

Typically our injectors are in the intake track and the fuel charge seems to get atomized better and becomes part of the air charge eliminating that issue.

I might be wrong, certainly time will tell if it is superior on a GM engine. From engine to engine I am sure these things can change.
WeaponX_Perf is offline   Reply With Quote
Old 10-27-2011, 10:47 PM   #4
TECH Enthusiast
 
cbr600rx7's Avatar
 
Trader Rating: 12
Join Date: Oct 2008
Posts: 694
Default

I wonder why it would be a issue. Lots of diesels out there using high pressure common rails systems and direct injection. Of course they dont depend on a spark for ignition but i would think if the issue was with the fuel/air mixture that it would cause hot spotting and high EGT's on modified trucks?

You may be dead on but i was just wondering more of what might be behind it.
__________________
2000 WS6 A4. Turbo Technology Inc T76, CXracing IC, Alky Control, 60lb injectors, Mosor 12 bolt, RPM Transmissions level 5 4L60, 17-35-315 TTM's, 524rwhp / 498 torque SOLD

2001 WS6. trick T56, LQ9 408, 11.3 CR, 247/251 112LSA cam , Monster stage 3, mosor 9" 4.11 gears. 470rwhp/440tq on motor. SOLD

2005 Z71 silverado CC/SB. M112 Eaton Magnacharger on 7 pounds. Daily Driver
cbr600rx7 is offline   Reply With Quote
Old 10-28-2011, 11:27 AM   #5
TECH Apprentice
 
Trader Rating: 2
Join Date: Aug 2009
Location: Hampton Roads, VA
Posts: 318
Default

I can add this. With direct injection you can have multiple injection events in each firing sequence. A small amount of fuel can be injected to start the burn and and an additional and even third injections after that. Most diesel applications using common rail now uses very high pressures (25,000 psi or more), I doubt at those pressures the air intake streams makes a huge difference in the fuel dispersion. That does change with gasoline however I would also imagine that the timing of the injection event could also improve the performance when airflow changes.
__________________
You had NO idea that when you opened up a can of whoop *** there'd be an LT1 in there?

1994 Formula Firebird Formula Coupe, M6, no t-tops

2014 LT1 build - ???? TBD (estimated 390rwhp)
2011 LT1 build - 366 rwhp / 344 ft-lbs
Jazz-LT1 is offline   Reply With Quote
Old 11-12-2011, 08:29 AM   #6
ctd
TECH Enthusiast
 
Trader Rating: 1
Join Date: Sep 2007
Location: Sicamous, BC
Posts: 587
Default

I've no 4 stroke DI experience, I've been around some 2 stroke DI engines.

Some of my observations......heat. Some of the unburnt Air & Fuel cool things considerably. In the case of 2 stroke DI motor's remove fuel from the crankcase, crankshaft & piston temps go ballistic. Then you mount the injectors on the cylinder head & heat those as well.

Then there is the rpm you want to run the injector when trying to compare Diesel's. Blown 2 & 4 strokes would be a bit more comparable that way.

Blown DI 2 strokes add secondary fuel back into the air intake stream.
ctd is offline   Reply With Quote
Old 11-28-2011, 12:47 AM   #7
Teching In
 
Trader Rating: 0
Join Date: Sep 2010
Posts: 2
Default

I can't wait for gen v with di
k4rr is offline   Reply With Quote
Old 11-28-2011, 12:47 AM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply


Tags
adding, boost, detonation, direct, head, ignition, inject, injection, ls1, modifing, modify, motors, pics, prevent, support


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 On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 02:10 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details