Changing injectors want recommendation
Thread Starter
Tech Contributor
Joined: Mar 2003
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Changing injectors want recommendation
I have data logged 95% duty cycle on my injectors while tuning the other day and I need to upgrade to a bigger injector. Anyone have a specific injector brand and size I should go to?
Is there an issue with using too big an injector? I will eventually go to a resleeved stroker so can I use 42 lbers now?
Are the racetronix injectors a good bet 42lbers?
Is there an issue with using too big an injector? I will eventually go to a resleeved stroker so can I use 42 lbers now?
Are the racetronix injectors a good bet 42lbers?
Race Director
Joined: Sep 1999
Posts: 12,438
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From: CONCORD NC
I guess you already know you'll have to get special o-rings and re-rig your fuel rails.
That aside, I run the GM turbo injectors on my race cars. I have LS2edit tables for them if you need, and they are readily available from GM. There were used in the Turbo TA etc. I can get a part number if you go GM.
That aside, I run the GM turbo injectors on my race cars. I have LS2edit tables for them if you need, and they are readily available from GM. There were used in the Turbo TA etc. I can get a part number if you go GM.
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Originally Posted by SpinMonster
I have data logged 95% duty cycle on my injectors while tuning the other day and I need to upgrade to a bigger injector. Anyone have a specific injector brand and size I should go to?
Is there an issue with using too big an injector? I will eventually go to a resleeved stroker so can I use 42 lbers now?
Are the racetronix injectors a good bet 42lbers?
Is there an issue with using too big an injector? I will eventually go to a resleeved stroker so can I use 42 lbers now?
Are the racetronix injectors a good bet 42lbers?
They can best advise you on an injector for your application.
Thread Starter
Tech Contributor
Joined: Mar 2003
Posts: 12,094
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by davidfarmer
I guess you already know you'll have to get special o-rings and re-rig your fuel rails.
That aside, I run the GM turbo injectors on my race cars. I have LS2edit tables for them if you need, and they are readily available from GM. There were used in the Turbo TA etc. I can get a part number if you go GM.
That aside, I run the GM turbo injectors on my race cars. I have LS2edit tables for them if you need, and they are readily available from GM. There were used in the Turbo TA etc. I can get a part number if you go GM.
What are the size of those injectors. Have you ever used the racetronics injectors? I am concerned about part throttle response with using a 42 lb injector on the stock displacement. Will that be affected?
Thread Starter
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by Racetronix
Give Thunder Racing, Blowerworks or Harris Speedworks a call.
They can best advise you on an injector for your application.
They can best advise you on an injector for your application.
How much is the fuel pump (LIST) harness you sell that allows the use of a boost-a-pump with the factory pump?
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Originally Posted by SpinMonster
How much is the fuel pump (LIST) harness you sell that allows the use of a boost-a-pump with the factory pump?
All Corvette harnesses are listed on our web page along with MSRP pricing. Thunder Racing and a few other Racetronix dealers carry them.
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Originally Posted by SpinMonster
What are the size of those injectors. Have you ever used the racetronics injectors? I am concerned about part throttle response with using a 42 lb injector on the stock displacement. Will that be affected?
Thread Starter
Tech Contributor
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by Racetronix
That all depends on the application.
All Corvette harnesses are listed on our web page along with MSRP pricing. Thunder Racing and a few other Racetronix dealers carry them.
All Corvette harnesses are listed on our web page along with MSRP pricing. Thunder Racing and a few other Racetronix dealers carry them.
Yes, I will be tuning the injector flow rate.
Thank you for answering but it seems to be that my question is not clear or some other issue. My question since the original post is do you loose low end responsiveness when you use a bigger injector....is 42 better than 50 or can I use a 50 with no adverse effects?...ie... is there such a thing as too big an injector?..is the driveability better with a smaller injector? Is a 42 smoother than a 50? What happens when you use a really big injector to the driveability?
Runiin out of ways to ask...LOL
Thanks again
Last edited by SpinMonster; Dec 12, 2005 at 03:48 AM.
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Thread Starter
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by Racetronix
That all depends on the application.
All Corvette harnesses are listed on our web page along with MSRP pricing. Thunder Racing and a few other Racetronix dealers carry them.
All Corvette harnesses are listed on our web page along with MSRP pricing. Thunder Racing and a few other Racetronix dealers carry them.
Yes, I will be tuning the injector flow rate. My question is do you loose low end responsiveness when you use a bigger injector....is 42 better than 50?
Drifting
Joined: Nov 2002
Posts: 1,651
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From: laguna niguel ca
Why do you need to change???
Andy Green uses the stock C6 injectors on his strokers. His 427 made over 530 RWHP with stock injectors. Fredo's new 402 is making 518RWHP with stock injectors. I drove it yesterday and it runs great. Am missing something about your motor and what you've done to it??
Race Director
Joined: Sep 1999
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From: CONCORD NC
Stock injectors/pump should do fine for street driving. For constant load applications (ie road racing, constant full throttle), the OEM fuel system can go close to 500HP, give or take.
I'm thinking the GM injectors are 36lbs, but not sure off hand. I've never had any reason to run anything except for these, since GM supplied the fuel tables for me. I had no reason to re-invent the wheel.
I'm thinking the GM injectors are 36lbs, but not sure off hand. I've never had any reason to run anything except for these, since GM supplied the fuel tables for me. I had no reason to re-invent the wheel.
Thread Starter
Tech Contributor
Joined: Mar 2003
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by andreas g.
Andy Green uses the stock C6 injectors on his strokers. His 427 made over 530 RWHP with stock injectors. Fredo's new 402 is making 518RWHP with stock injectors. I drove it yesterday and it runs great. Am missing something about your motor and what you've done to it??
If you want to run 100% duty cycle then you can hit those numbers but if you want 80% then you need bigger injectors. At 530 you are way maxed out with the stock fuel pressure. So if you have 460-480rwhp which is a cam and heads with all bolt-ons you are over 80%duty cycle. I am surprised that would fly in a set-up from Lingenfelter.
Another issue is if you run a dry shot leaning off the injectors for additional fuel as I do at the moment and I run richer 12.5:1 since it is a nitrous car. If I ran 13:1 i would have 4% more headroom.
I'll start another thread to ask my question about low end responsiveness of large injectors.
Last edited by SpinMonster; Dec 12, 2005 at 05:58 PM.
Thread Starter
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Fuel Injector Question
Do larger fuel injector have poorer throttle response then smaller ones do? Is there a such thing a s too big an injector in which you loose drivability in the low rpm range.