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Will I need to upgrade injectors with a cam swap?

This is a discussion on Will I need to upgrade injectors with a cam swap? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by qwik219d9 do you have a link for these 42LBers? and will the GM electrical plug have to ...

  1. #21
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by qwik219d9 View Post
    do you have a link for these 42LBers?

    and will the GM electrical plug have to be changed to Ford?

    Thanks
    http://www.buyfordracing.com/


    No adaptors for 98-02 LS1.

  2. #22
    Member qwik219d9's Avatar
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    42LBers

    Quote Originally Posted by Hi-Po View Post
    http://www.buyfordracing.com/


    No adaptors for 98-02 LS1.
    looks like a good deal.

    are these high or low impedance or just regalur ?

    are these injectors the one's you are using?

    thanks
    Last edited by qwik219d9; 10-31-2009 at 04:04 PM.

  3. #23
    LSX whore allbaugh_04's Avatar
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    Damn injectors are a bit pricey hi-po, those ones you linked were the cheapest.

    Anyone know if Cobra injectors would work?

    I'm sure these ones will work fine:

    http://cgi.ebay.com/ebaymotors/30-lb...item2c51a3f545

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    Quote Originally Posted by suede View Post
    Muahahahahahaha, im onto you now tim....

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    Quote Originally Posted by allbaugh_04 View Post
    Damn injectors are a bit pricey hi-po, those ones you linked were the cheapest.

    Anyone know if Cobra injectors would work?

    I'm sure these ones will work fine:

    http://cgi.ebay.com/ebaymotors/30-lb...item2c51a3f545
    Those will probably work. Not much of an upgrade even from 28 #ers though. What you could do is keep your stockers, go and have it tuned, see what duty cycle your at and if its safe/not holding you back on power etc. Then sweet talk the tuner into a cheap re-visit with larger injectors.

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    LSX whore allbaugh_04's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Those will probably work. Not much of an upgrade even from 28 #ers though. What you could do is keep your stockers, go and have it tuned, see what duty cycle your at and if its safe/not holding you back on power etc. Then sweet talk the tuner into a cheap re-visit with larger injectors.
    I can probably swing the sweet talking but I am pretty sure 2000's came with #26lbers. That's why I am worried. But damn, for 50 bucks (current bid) vs. 250, they might be worth the risk.

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    Quote Originally Posted by allbaugh_04 View Post
    I can probably swing the sweet talking but I am pretty sure 2000's came with #26lbers. That's why I am worried. But damn, for 50 bucks (current bid) vs. 250, they might be worth the risk.
    Yea, I was basing the price difference from the cost of 28#er's. It might be a trial and error thing. If I was further along in my up coming build, I would sell you my 42's for dirt cheap

    Try the 30# out, they will probably be enough. I cant say because I have no personal experience with them. I just ran over some of my most recent 11 second logging and I'm at 66% DC at 6800 RPM with these 42#ers. I would think you would be alright.

  8. #28
    LSX whore allbaugh_04's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Yea, I was basing the price difference from the cost of 28#er's. It might be a trial and error thing. If I was further along in my up coming build, I would sell you my 42's for dirt cheap

    Try the 30# out, they will probably be enough. I cant say because I have no personal experience with them. I just ran over some of my most recent 11 second logging and I'm at 66% DC at 6800 RPM with these 42#ers. I would think you would be alright.
    I would also think 42lbers out of an '08 z06 would work....I'll ask around.

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    Quote Originally Posted by Hi-Po View Post
    http://www.buyfordracing.com/


    No adaptors for 98-02 LS1.
    Question What about on a 97 LT1? I need to do about 40lb for a 383 I am building. Will the green top work for me or not?

  10. #30
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    Quote Originally Posted by JaycenK View Post
    Question What about on a 97 LT1? I need to do about 40lb for a 383 I am building. Will the green top work for me or not?
    I'm not completely sure. I know they are plug and play for LS1's. The 97 might be an exception though. I'm not familiar with LT anything and don't do much reading up on them either. Maybe someone with LT knowledge will step in for you.

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    Looking back, The LS1 and LT1 share the same EV1 rectangular port compared to the "round" port of the LS2 (05-06 GTO). I think they will work, but research a little more.

  12. #32
    Member qwik219d9's Avatar
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    tuned or just data logged w/ HP

    Quote Originally Posted by Hi-Po View Post
    Those will probably work. Not much of an upgrade even from 28 #ers though. What you could do is keep your stockers, go and have it tuned, see what duty cycle your at and if its safe/not holding you back on power etc. Then sweet talk the tuner into a cheap re-visit with larger injectors.
    I meet a LS1 expert by luck. he said he would data log the DC of my 26LBers for free.

    however if the DC was high ? what would be to high anything above 85%?

    I would have to buy a HP tuners credit for him to correct w/ tuning I'm thinking a HP tuners credit is like $47. plus a little extra for his time.

    it would probably be smart to have larger injectors on hand during this time if they are needed for a quick swap.

    I will be connecting the fuel preasure guage up this week this expert told me I would'nt see any drop off in FP and the problem w/ 99 models is the small 26LBer maxing it's DC.

    thanks for any feedback.
    Last edited by qwik219d9; 11-12-2009 at 10:51 PM.

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    80% is max I have read

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    to much risk

    Quote Originally Posted by allbaugh_04 View Post
    I can probably swing the sweet talking but I am pretty sure 2000's came with #26lbers. That's why I am worried. But damn, for 50 bucks (current bid) vs. 250, they might be worth the risk.
    I talked to a fuel injector expert, he told me that you should never install used FI w/out haveing them flow tested at a cost of around $150.

    IMO used is to much risk plus that Egay listing say's nothing about how many miles the FI have.

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    Quote Originally Posted by qwik219d9 View Post
    I meet a LS1 expert by luck. he said he would data log the DC of my 26LBers for free.

    however if the DC was high ? what would be to high anything above 85%?

    I would have to buy a HP tuners credit for him to correct w/ tuning I'm thinking a HP tuners credit is like $47. plus a little extra for his time.

    it would probably be smart to have larger injectors on hand during this time if they are needed for a quick swap.

    I will be connecting the fuel pressure gauge up this week this expert told me I wouldn't see any drop off in FP and the problem w/ 99 models is the small 26LBer maxing it's DC.

    thanks for any feedback.
    A electric fuel pressure gauge should have zero effect on FP.

    One credit is 50 bucks, its takes two credits to make any changes.

    85% would be a nice place to start thinking about swapping. I ran mine at 91% for quite awhile. 85% would be fine on a NA setup IMO.

    Your friend needs to have the proper/correct fuel injector scaling numbers or needs to know how to figure them out. I wouldn't go off buying new injectors without logging the ones you have now.

  16. #36
    Member qwik219d9's Avatar
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    80%

    Quote Originally Posted by allbaugh_04 View Post
    80% is max I have read
    yeah I thought the max was around 80-85%

    have you read anything about mileage dropping off w/ addition of much larger FIs?

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    Quote Originally Posted by qwik219d9 View Post
    yeah I thought the max was around 80-85%

    have you read anything about mileage dropping off w/ addition of much larger FIs?
    I've always wondered, but it shouldn't.

    I mean, when you are adding power to an N/A setup, it's gonna lose mileage cuz you are always making more power I figure. I quit worrying, because I'm gonna add power, so what does it matter?

    So what about the 42lbers off an LS7...I'm not getting much input

  18. #38
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    Quote Originally Posted by Hi-Po View Post
    A electric fuel pressure gauge should have zero effect on FP.

    One credit is 50 bucks, its takes two credits to make any changes.

    85% would be a nice place to start thinking about swapping. I ran mine at 91% for quite awhile. 85% would be fine on a NA setup IMO.

    Your friend needs to have the proper/correct fuel injector scaling numbers or needs to know how to figure them out. I wouldn't go off buying new injectors without logging the ones you have now.
    A electric fuel pressure gauge should have zero effect on FP.

    I was suspecting a low FP at WOT that would be easy to observe w/ a meter
    connected.

    I have been told conflicking infor. about these 26LBers (been told by speed inc there good for 425RWHP before maxing out) I'm at 380RWHP.
    so I suspecting a preasure issuse.

    I did'nt know it takes 2 credits for a change.
    thanks for feedback.

  19. #39
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    Quote Originally Posted by allbaugh_04 View Post
    I've always wondered, but it shouldn't.

    I mean, when you are adding power to an N/A setup, it's gonna lose mileage cuz you are always making more power I figure. I quit worrying, because I'm gonna add power, so what does it matter?

    So what about the 42lbers off an LS7...I'm not getting much input
    my concern w/ mileage drop off I was referring to normal cruiseing around.

    I think this is where the scaleing w/ the tuning software is real important to be exact.

    I'm sure at WOT it will consume more fuel.

  20. #40
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    Quote Originally Posted by qwik219d9 View Post
    A electric fuel pressure gauge should have zero effect on FP.

    I was suspecting a low FP at WOT that would be easy to observe w/ a meter
    connected.

    I have been told conflicking infor. about these 26LBers (been told by speed inc there good for 425RWHP before maxing out) I'm at 380RWHP.
    so I suspecting a preasure issuse.

    I did'nt know it takes 2 credits for a change.
    thanks for feedback.
    I think I mis read your post for a second. Thought you were asking if a pressure guage would drop the FP. After re-reading I dont think you asked that.

    With the guage hooked up to the rail, It should be 58ish PSI and around 50ish PSI at WOT

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