Running 42lb Injectors on stock tune? TEMP
04-24-2017, 07:32 AM
#1
Staging Lane
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Running 42lb Injectors on stock tune? TEMP Hey guys i have a set of 42Lb injectors (pt # 0280155811) with a Racetronix fuel pump.
Im wondering if i can install the injectors and run the car with the stock tune temporarily so i can get it to a tuner, or would the car be rendered undriveable upon install?
Anyone have any experience?
thanks.
Im wondering if i can install the injectors and run the car with the stock tune temporarily so i can get it to a tuner, or would the car be rendered undriveable upon install?
Anyone have any experience?
thanks.
04-24-2017, 08:17 AM
#2
On The Tree
The car will run dead rich with almost twice the needed fuel being added.
It will likely need spark plugs and an oil change when you get to the tuner.
Why are you installing 42# injectors?
Putting 600hp injectors on a motor that is only capable of 400hp is a step backwards.
It will likely need spark plugs and an oil change when you get to the tuner.
Why are you installing 42# injectors?
Putting 600hp injectors on a motor that is only capable of 400hp is a step backwards.
04-24-2017, 10:42 AM
#3
Staging Lane
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Thanks for reply, well my goals for the car is around 450 hp i was told stock injectors would be stretched too much for those numbers.
Unless i was given wrong information
Unless i was given wrong information
04-26-2017, 07:38 PM
#6
To answer the OP's original question... no I wouldn't start the car with the 42s. You will wash down the cylinders. If you could get to the IFR table, you can adjust it and it'd be better to drive, but still not ideal. See if you can get a startup tune if you need to drive it with the correct injector data and a basemap for the VE and MAF tables.
99 stock injectors flow 26lbs. And that's at 4-bar.
The 42s are @ 3-bar... so about 50lbs at 4-bar.
The GTP 36lbs @ 3-bar (stock for the supercharged V6 motors) are a very good Bosch injector with a ton of good tuning data on them since they were used in GM racing and came in stock applications and are a direct replacement for the LS1 injectors. They are sold as the FAST 36lbs for a reasonable amount. They flow around 42lbs @ 4-bar. For a heads/cam car, they are the ones I recommend.
99 stock injectors flow 26lbs. And that's at 4-bar.
The 42s are @ 3-bar... so about 50lbs at 4-bar.
The GTP 36lbs @ 3-bar (stock for the supercharged V6 motors) are a very good Bosch injector with a ton of good tuning data on them since they were used in GM racing and came in stock applications and are a direct replacement for the LS1 injectors. They are sold as the FAST 36lbs for a reasonable amount. They flow around 42lbs @ 4-bar. For a heads/cam car, they are the ones I recommend.
05-02-2017, 08:58 AM
#7
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To answer the OP's original question... no I wouldn't start the car with the 42s. You will wash down the cylinders. If you could get to the IFR table, you can adjust it and it'd be better to drive, but still not ideal. See if you can get a startup tune if you need to drive it with the correct injector data and a basemap for the VE and MAF tables.
99 stock injectors flow 26lbs. And that's at 4-bar.
The 42s are @ 3-bar... so about 50lbs at 4-bar.
The GTP 36lbs @ 3-bar (stock for the supercharged V6 motors) are a very good Bosch injector with a ton of good tuning data on them since they were used in GM racing and came in stock applications and are a direct replacement for the LS1 injectors. They are sold as the FAST 36lbs for a reasonable amount. They flow around 42lbs @ 4-bar. For a heads/cam car, they are the ones I recommend.
99 stock injectors flow 26lbs. And that's at 4-bar.
The 42s are @ 3-bar... so about 50lbs at 4-bar.
The GTP 36lbs @ 3-bar (stock for the supercharged V6 motors) are a very good Bosch injector with a ton of good tuning data on them since they were used in GM racing and came in stock applications and are a direct replacement for the LS1 injectors. They are sold as the FAST 36lbs for a reasonable amount. They flow around 42lbs @ 4-bar. For a heads/cam car, they are the ones I recommend.
The injectors im looking to install are from a GTP pt # 0280155811, (at least thats what i was told when i purchased them from classifieds) So they are really 36lb injectors with the ability to flow up to 42? Would you still recommend me to shy away from running them until tuned?
thanks for info
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05-03-2017, 03:42 PM
#8
Yes, they are 36# that flow 42# at LS pressure. I run them, and love them! Yes, DO NOT put them in and drive it without tuning it.
I had the stock 26# injectors running 0ver 90% dc on my modded 5.3, I have no idea why GM cut them so short on the LS when they had a direct drop in injector already. JMO
I had the stock 26# injectors running 0ver 90% dc on my modded 5.3, I have no idea why GM cut them so short on the LS when they had a direct drop in injector already. JMO
05-02-2021, 01:45 PM
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Yes, they are 36# that flow 42# at LS pressure. I run them, and love them! Yes, DO NOT put them in and drive it without tuning it.
I had the stock 26# injectors running 0ver 90% dc on my modded 5.3, I have no idea why GM cut them so short on the LS when they had a direct drop in injector already. JMO
I had the stock 26# injectors running 0ver 90% dc on my modded 5.3, I have no idea why GM cut them so short on the LS when they had a direct drop in injector already. JMO
05-02-2021, 02:04 PM
#11
TECH Senior Member
Unless it is actually starving for fuel, why do you need larger injectors? Larger injectors alone will not gain power.
05-02-2021, 02:47 PM
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My stock are 26# I believe so... so here is what I have and with being a first timer I'm just seeking best advice and if I do, I don't mean to sound dumb...my 862 heads are ported.. I have HP stage 2 Dr. Bump Stick... cam specs show... .050 Dur.Exh./ .050 Dur.Int. /Valve lift int. .578 /Valve lift Exh. .587/ Cam lift int. .340 /Cam lift Exh. .345 - C/L Int. 116 - C/L Exh. 108 / Duration 226/232.... I have 92mm throttle body.. 4 inch cold air intake.. new valve springs.. flat top pistons... long tube header with after market cats... so with that ( I'm sure I'm missing few things) do I need bigger injectors and bigger MAF? Just trying to figure out what all I need before the install and taking it to my programmer. Like I said if I sound dumb my apologies.. just wanting to learn I am self taught on most everything( just did a first time build on my 4l60E 4x4 Trans (all Jegs) and it turned out great.
05-02-2021, 03:07 PM
#13
TECH Senior Member
Hook up a wide band O2 sensor and see where your A/F ratio goes under ALL driving conditions. Don't try to guess at it.
05-02-2021, 08:38 PM
#15
On The Tree
Don’t run the car with those injectors untuned - that’s good advice. Those injectors aren’t overkill for your goals imo. I’m running 42lb green tops with the racetronix pump &hotwire kit. My car was on the verge of tapping out the stock injectors.
05-02-2021, 08:44 PM
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thanks! As soon as the motor swap is done its being shipped straight to the shop for a tune so I guess I will figure more out from there
