douglas_be

let me know please ,

Thanks

HKJ

iTrader: (1)

i'd like to know too

Padawan

There is a pretty good explanation here.

andrewasf77

what is the major difference here?

1stGENGSR

I read about this a few years back...It has to do with electrical signals to the injector...Peak and hold work off two different increments of voltage they reach a peak and they hold as long as the ecu tells them too...Where as saturated injectors work off of constant voltage that does not have the complexity like the peak and hold...this allows for more efficient fuel delivery and is easier to manipulate with aftermarket programming...The 90-91' Integra used p&h, the 92' on ran saturated...So it seems peak and hold became outdated or just weren't worth the extra costs...Sorry to be so damn vauge and possibly a little innaccurate, but it's been a long time...But the little tech guy in SCC covered this in like 99' so you might be able to go to their website and find it in the archives...MSd's explanation is really good. (Just above this post)

jeremy.

not from me but pretty good explanation:

There are two basic types of injectors that work on Honda and acura cars. How they operate are totally different. Let's take a look.

Peak and Hold:

Peak/hold injectors are low impedence, usually in the 1-4 ohm range. When the ecu calls for fuel to be injected, it sends out voltage via the wire clips until a certain current level is reached (the peak part) (varies by injector size, company). For the duration of 1 pulse width, that current is slightly reduced and held (the hold part).

Advantages of this design:
minimizes the injectors "on" time, resulting in faster response

Disadvantages of this design:
increases coil heat, which can lead to failure over time


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Saturated:

Saturated injectors are generally higher impedence than peak and hold, running in about the 10-15 ohms range. Unlike peak/hold, a saturated injector remains "on" for the entire pulse width.

Advantages of this design:
reduces heat

Disadvantages of this design:
slower response time
can't handel large CC or lb/hr styles due to limitations in its speed.


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So, which should I choose?

There are a ton of factors involved in this.

First, power level. If you're going big, there simply won't be a saturated injector that will support your power level. The largest common saturated injecotrs on the market are 550cc, with 440cc being a common "cap" in saturated size. Most boosted people run peak/hold setups for not only their availibilty, but also their ease of upgrading later on if so desired. simply swap the injectors. no need to re-wire again.
How is your car wired? most obd0 civics and some preludes are wired for peak/hold and have a resisitor box already. No point in changing to a saturated. Obd1+2 civics, and most other honda/acura cars after 1992 are all saturated and are not wired with resisitor boxes. Again, if there is an injector availble in your power range for flow of your car's design type, there's little sense to change.
Price. DSM eclipse/talon 450cc peak and hold injectors fit honda rails and with just a minor modification plug right in. best of all, these can be had for about $50-75 a set of 4 instead of $350+ for a set of aftermarket injectors. Add a $25 resistor box from an obd0 civic/crx, wire it up, and you're good to go in you're saturated car.