Remove Resistor Box and run Saturated Fuel Injectors in 4th Gen?
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From: Snohomish county, WA, USA
Remove Resistor Box and run Saturated Fuel Injectors in 4th Gen?
From what I gather, the 4th gen Prelude VTEC (H22A1) runs Peak & Hold injectors stock and uses a resistor box, correct? I was told I can run Saturated injectors if I just simply remove the resistor box. Is this correct? If so, is there any downside to doing this? Or should I only buy peak and hold injectors? I'm looking for a 440cc injector, ideally, for my All-motor build and RC and Precision only list high impedence saturated injectors in this size.
Thanks
Thanks
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From: Snohomish county, WA, USA
Re: (mgags7)
I think I've got this figured out now. I forgot to factor in that I will be using a P28 ECU and Crome, and that ECU is meant for saturated. So saturated should be fine in my case.
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From: westchester or philly, ny
Re: (UK_Luder)
It doesnt matter what ecu you are using.
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use.
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use.
RTFM
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From: Conroe, TX
Re: (kulrevon)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon »</TD></TR><TR><TD CLASS="quote">It doesnt matter what ecu you are using.
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use. </TD></TR></TABLE>
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use. </TD></TR></TABLE>
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.
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Re: (v4lu3s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s »</TD></TR><TR><TD CLASS="quote">
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.</TD></TR></TABLE>
It is possible if you are running an EMS that is capable of altering the current to the injectors. If you run this on a stock ECU or piggyback, you will fry the ECU, or you will severly shorten the life of your injectors/ECU. There are only a handful of EMS on the market that are capable, and they are VERY expensive.
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.</TD></TR></TABLE>
It is possible if you are running an EMS that is capable of altering the current to the injectors. If you run this on a stock ECU or piggyback, you will fry the ECU, or you will severly shorten the life of your injectors/ECU. There are only a handful of EMS on the market that are capable, and they are VERY expensive.
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RTFM
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From: Conroe, TX
Re: (Scheizty)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Scheizty »</TD></TR><TR><TD CLASS="quote">
It is possible if you are running an EMS that is capable of altering the current to the injectors. If you run this on a stock ECU or piggyback, you will fry the ECU, or you will severly shorten the life of your injectors/ECU. There are only a handful of EMS on the market that are capable, and they are VERY expensive.</TD></TR></TABLE>
you will not fry the ecu, i know that from first hand experience on multiple vehicles. But as I said its a long way from ideal, and I personally do not run my own cars for any length of time with mismatched injectors/ecus.
It is possible if you are running an EMS that is capable of altering the current to the injectors. If you run this on a stock ECU or piggyback, you will fry the ECU, or you will severly shorten the life of your injectors/ECU. There are only a handful of EMS on the market that are capable, and they are VERY expensive.</TD></TR></TABLE>
you will not fry the ecu, i know that from first hand experience on multiple vehicles. But as I said its a long way from ideal, and I personally do not run my own cars for any length of time with mismatched injectors/ecus.
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Re: (v4lu3s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s »</TD></TR><TR><TD CLASS="quote">
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.</TD></TR></TABLE>
Thank you sir.
You are absolutely correct.
Rich, if you're interested, there is a lot of good information on the topic.
While it can be made to work the "wrong" way, it is not ideal. I believe that if you use P&H injectors with saturated drivers and a resistor box, you'll be overheating the hell out of them, because they don't want the high voltage over the whole duty cycle, and instead of being used to hold the valve open, it will be converted into heat.
i have read several articles that state the injectors operate very differently. peak and hold have a peak voltage, then a lower voltage to hold the injector open, while saturated just use one voltage to open and hold the injectors. If you were to go and buy an injector driver on the aftermarket you would also need to specify peak and hold or saturated as well.
It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.</TD></TR></TABLE>
Thank you sir.
You are absolutely correct.
Rich, if you're interested, there is a lot of good information on the topic.
While it can be made to work the "wrong" way, it is not ideal. I believe that if you use P&H injectors with saturated drivers and a resistor box, you'll be overheating the hell out of them, because they don't want the high voltage over the whole duty cycle, and instead of being used to hold the valve open, it will be converted into heat.
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From: Snohomish county, WA, USA
Re: (kulrevon)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon »</TD></TR><TR><TD CLASS="quote">It doesnt matter what ecu you are using.
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use. </TD></TR></TABLE>
How tough is it to rewire the injectors? So as long as I take out the resistor box and rewire the injectors then it will be running safely and properly, right?
If you use peak and hold injectors you need to use a resistor.
If you use saturated you do NOT use a resistor.
If you use a p28 in a prelude you still need peak and holds unless you take out the resistor and rewire the injectors. The ecu has nothing to do with what injectors you use. </TD></TR></TABLE>
How tough is it to rewire the injectors? So as long as I take out the resistor box and rewire the injectors then it will be running safely and properly, right?
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Re: (v4lu3s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s »</TD></TR><TR><TD CLASS="quote">
you will not fry the ecu, i know that from first hand experience on multiple vehicles. But as I said its a long way from ideal, and I personally do not run my own cars for any length of time with mismatched injectors/ecus.</TD></TR></TABLE>
http://www.hondata.com/techlowohminjectors.html
ECUs do fry. In this test, the fuel wasn't there to cool the injector, but if you run it long enough, it will go.
Running your ECU hotter than it should will definately have an effect on the life and reliablilty of the ECU.
you will not fry the ecu, i know that from first hand experience on multiple vehicles. But as I said its a long way from ideal, and I personally do not run my own cars for any length of time with mismatched injectors/ecus.</TD></TR></TABLE>
http://www.hondata.com/techlowohminjectors.html
ECUs do fry. In this test, the fuel wasn't there to cool the injector, but if you run it long enough, it will go.
Running your ECU hotter than it should will definately have an effect on the life and reliablilty of the ECU.
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From: westchester or philly, ny
Re: (Scheizty)
Scheizty that information is correct from hondata. But you are using it to prove something it doesn't.
The hondata information proves you can fry an ecu if you use low impedance (peak & hold ) injectors without a resistor pack.
I have experience with running peak & holds and installing a resistor box in a car that had saturateds. I have never removed a resistor box to run saturateds.
If you want a set of 450cc peak and holds you can get them from a first or second gen eclipse manual turbo. and all you have to do is get different injector seals.
Here is some info on the install. Just ignore the info about putting the resisters in.
http://www.homemadeturbo.com/t....html
The hondata information proves you can fry an ecu if you use low impedance (peak & hold ) injectors without a resistor pack.
I have experience with running peak & holds and installing a resistor box in a car that had saturateds. I have never removed a resistor box to run saturateds.
If you want a set of 450cc peak and holds you can get them from a first or second gen eclipse manual turbo. and all you have to do is get different injector seals.
Here is some info on the install. Just ignore the info about putting the resisters in.
http://www.homemadeturbo.com/t....html
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Re: (kulrevon)
Noone ever said that you cannot run saturated injectors on a resistor box. I wasn't posting in response to the OP question. I am making sure that the correct information is getting across.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s »</TD></TR><TR><TD CLASS="quote">It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.
</TD></TR></TABLE>
It's not a good idea to put injectors that need a higher impedence on a system with saturated injectors (does not have a resistor box), unless you are putting in a resistor box.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s »</TD></TR><TR><TD CLASS="quote">It is possible to run peak and hold on a saturated ecu or vice versa, but its not ideal.
</TD></TR></TABLE>
It's not a good idea to put injectors that need a higher impedence on a system with saturated injectors (does not have a resistor box), unless you are putting in a resistor box.
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