Need bigger injectors....suggestions?
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 903
Likes: 5
From: Miami FL
Need bigger injectors....suggestions?
For those who have upgraded your injectors, what are you using? I need bigger injectors and am not sure what plug and play option is at this point. I need something that will support 550whp N/A.
Dougie
Dougie
Instructor
Joined: Sep 2006
Posts: 148
Likes: 0
From: Norfolk Va
I made 561rwhp with a SC using 42's, not sure about the connectors being the same on a LS2 injector and a LS1.
Brake specific fuel consumption is less on a NA engine than a FI. So 42's should get you to that level without an issue.
And there are various sites online that can help you figure out injector size for a given HP level.
Brake specific fuel consumption is less on a NA engine than a FI. So 42's should get you to that level without an issue.
And there are various sites online that can help you figure out injector size for a given HP level.
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Most head/cam cars see 100% duty cycle by 470rwhp and in the winter with denser air, they will go over as seen in a scan. Keeping things at 80% max is best. 42's are perfect and leave plenty of air. They are easy to tune in too.
While you most certainly can peak at 500rwhp, it doesnt guarranty a flat A/F curve and the injectors will be plenty hot from being on all the time.
Drifting
Joined: Sep 2004
Posts: 1,551
Likes: 4
From: Livingston Texas
Most head/cam cars see 100% duty cycle by 470rwhp and in the winter with denser air, they will go over as seen in a scan. Keeping things at 80% max is best. 42's are perfect and leave plenty of air. They are easy to tune in too.
While you most certainly can peak at 500rwhp, it doesnt guarranty a flat A/F curve and the injectors will be plenty hot from being on all the time.
While you most certainly can peak at 500rwhp, it doesnt guarranty a flat A/F curve and the injectors will be plenty hot from being on all the time.
Mine run from 80-85% and I am only at 400 RWHP. I do not know of any "plug and play" injectors for the LS2.
You could add a water/meth injection kit to lower the duty cycle of the injectors. However I still think you would be pushing it at 550 RWHP.
Burning Brakes
Joined: Dec 2004
Posts: 810
Likes: 1
From: Turbocharged in NC
I ordered the Siemens 60# injectors from Lingenfelter for my APS Twin Turbo car. They are labeled as 70# injectors on their site because that is what they flow on the corvette's fuel rail pressure, and they also sell plugs for them so that they will plug into your stock wiring harness. I am running just about 500rwhp or so, and at that level my injectors are running about 60% duty cycle with my Kennebell Boost-A-Pump. I hope to bump up to about 550rwhp soon without meth injection, and I know these injectors will handle it without a problem. Tuning was more of a challenge because the LS2 doesn't really let you input an injector size of more than 63#, but it was worth it, you just adjust a couple of the other fuel tables to get your fueling right on the computer. Driveability and fuel economy have not really changed from stock... Oh until you floor it.
Here are pics of my install Click Here
Here are pics of my install Click Here
Last edited by wewing; May 9, 2007 at 09:55 PM.
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Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 903
Likes: 5
From: Miami FL
Ummm.....nope. I see 100% DC by 6000 rpms and the car is at 13.3:1 through the tailpipe and can't get it any richer. I'm at 104% by power peak. My car put down 485whp. I'm not saying you can't see that power, but not safely.
Ditto on that Spin. I have a new project in the works and wanted to know what just "plugs up" without issue. I've used the FMS(ford motorsport) injectors on my two previous setups and they worked great and tuned great as well, but I know they aren't a bolt up and go affair. I was kinda wondering if an LS7 injector dropped right in and I could just cut and paste an LS7 IFR table and it be spot on. Otherwise I'll have to look for some injector wiring harness kit through Katech or something.
If anyone has any specific info of injectors of 42lb or less please post the type and model nubmer of injector.
Thanks in advance,
dougie
Most head/cam cars see 100% duty cycle by 470rwhp and in the winter with denser air, they will go over as seen in a scan. Keeping things at 80% max is best. 42's are perfect and leave plenty of air. They are easy to tune in too.
While you most certainly can peak at 500rwhp, it doesnt guarranty a flat A/F curve and the injectors will be plenty hot from being on all the time.
While you most certainly can peak at 500rwhp, it doesnt guarranty a flat A/F curve and the injectors will be plenty hot from being on all the time.
If anyone has any specific info of injectors of 42lb or less please post the type and model nubmer of injector.
Thanks in advance,
dougie
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I ordered the Siemens 60# injectors from Lingenfelter for my APS Twin Turbo car. They are labeled as 70# injectors on their site because that is what they flow on the corvette's fuel rail pressure, and they also sell plugs for them so that they will plug into your stock wiring harness. I am running just about 500rwhp or so, and at that level my injectors are running about 60% duty cycle with my Kennebell Boost-A-Pump. I hope to bump up to about 550rwhp soon without meth injection, and I know these injectors will handle it without a problem. Tuning was more of a challenge because the LS2 doesn't really let you input an injector size of more than 63#, but it was worth it, you just adjust a couple of the other fuel tables to get your fueling right on the computer. Driveability and fuel economy have not really changed from stock... Oh until you floor it.
Here are pics of my install Click Here
Here are pics of my install Click Here
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Ummm.....nope. I see 100% DC by 6000 rpms and the car is at 13.3:1 through the tailpipe and can't get it any richer. I'm at 104% by power peak. My car put down 485whp. I'm not saying you can't see that power, but not safely.
Ditto on that Spin. I have a new project in the works and wanted to know what just "plugs up" without issue. I've used the FMS(ford motorsport) injectors on my two previous setups and they worked great and tuned great as well, but I know they aren't a bolt up and go affair. I was kinda wondering if an LS7 injector dropped right in and I could just cut and paste an LS7 IFR table and it be spot on. Otherwise I'll have to look for some injector wiring harness kit through Katech or something.
If anyone has any specific info of injectors of 42lb or less please post the type and model nubmer of injector.
Thanks in advance,
dougie
Ditto on that Spin. I have a new project in the works and wanted to know what just "plugs up" without issue. I've used the FMS(ford motorsport) injectors on my two previous setups and they worked great and tuned great as well, but I know they aren't a bolt up and go affair. I was kinda wondering if an LS7 injector dropped right in and I could just cut and paste an LS7 IFR table and it be spot on. Otherwise I'll have to look for some injector wiring harness kit through Katech or something.
If anyone has any specific info of injectors of 42lb or less please post the type and model nubmer of injector.
Thanks in advance,
dougie
Drifting
Joined: May 2005
Posts: 1,254
Likes: 0
From: Ft. Liquordale Florida
Injector changes require a change in the Flow Rate vs KPA and Mimimum Injector Pulse tables in the tune if you deviate to far from stock (like more than a couple of lbs.).
Also, beware the 50# MSD injectors. I tried them (in an effort to not have to go to 60#'ers) and the computer just DID NOT LIKE THEM. Would start FREAKING OUT about 2KRPM after they got "warm". Ended up doing 60# Mototronics. Also note the Flow Rate table max's @ 48.70 in our ECU's (haven't got a clue why)...
Rick
Also, beware the 50# MSD injectors. I tried them (in an effort to not have to go to 60#'ers) and the computer just DID NOT LIKE THEM. Would start FREAKING OUT about 2KRPM after they got "warm". Ended up doing 60# Mototronics. Also note the Flow Rate table max's @ 48.70 in our ECU's (haven't got a clue why)...
Rick
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
Injector changes require a change in the Flow Rate vs KPA and Mimimum Injector Pulse tables in the tune if you deviate to far from stock (like more than a couple of lbs.).
Also, beware the 50# MSD injectors. I tried them (in an effort to not have to go to 60#'ers) and the computer just DID NOT LIKE THEM. Would start FREAKING OUT about 2KRPM after they got "warm". Ended up doing 60# Mototronics. Also note the Flow Rate table max's @ 48.70 in our ECU's (haven't got a clue why)...
Rick
Also, beware the 50# MSD injectors. I tried them (in an effort to not have to go to 60#'ers) and the computer just DID NOT LIKE THEM. Would start FREAKING OUT about 2KRPM after they got "warm". Ended up doing 60# Mototronics. Also note the Flow Rate table max's @ 48.70 in our ECU's (haven't got a clue why)...
Rick
Drifting
Joined: May 2005
Posts: 1,254
Likes: 0
From: Ft. Liquordale Florida
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
Oops. Got the rate table. Could not find that maximum value anywhere, except in the table. So I guess that's what you meant.
For spinmonster, here's my Z06 flow rate table:
43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.96959 44.60224 45.19516 45.79003 46.16206 46.53119 46.97491 47.41864
For spinmonster, here's my Z06 flow rate table:
43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.33694 43.96959 44.60224 45.19516 45.79003 46.16206 46.53119 46.97491 47.41864
