4k-c Fuel Injection Discussion??

[lanceishere]

ok, before i start my yabbering, i started this topic for some THEORETICAL discussion because i'm curious and i don't seem to be the only one...

 

so, 4k-c fuel injection, pros? cons? is it worth it? what are the options? details?

could one say... do a direct swap with parts from a 4k-e? or another k-series engine?

or something along the lines of this? http://www.tweakit.net/shop/product_info.p...3mb50mavvs5bsv6

 

p.s. i openly admit to knowing almost nothing about engines and related things of that nature... so i want to get learned! :P

[LukeAE71]

That product in the link you provided is going to work out pretty expensive when you factor in an ecu to go with it too. Would be looking at upwards of $3k once you factor in computer and then the tuning etc.

 

There is factory ecu and injection gear available you just have to find one to buy. Would be much cheaper than that link product.

[Taz_Rx]

Personally I would not waste my time with 4ke gear, this is why I have a 7ke injection system on my car.

 

The 4ke stuff is somewhat rare, so this makes it a little more expensive with most kits fetching around $500!!. On the other hand, its not that hard to find a wrecked KR42R townace in a commercial wreckers to aquire a 7ke setup for half the price of 4ke gear. Myself and Madrolla68 both paid $250 for our 7ke setups.

 

The main reason why I think 4ke gear isn't great is the throttle body, its about the size of a 50c piece! Compare that to the one in a 7ke with is about 2 inches in diametre (the OD of the throttle body inlet is 2.25" so the butterfly would be about 2").

The injectors in 4ke gear are also tiny at 145cc, so they can only support 116 (flywheel) HP.

7ke's have 190cc injectors so they can support a touch over 150HP.

If you wanted to go forced induction with either setup you would want to upgrade the injectors. I'm currently running 315cc 7MGE injectors which gives me a power potential of 250HP. Most of the 4AGE injectors would make a nice upgrade for a NA engine.

 

The quad throttle body injection systems you have linked to are good, but are really in the upper end of the market price wise at over twice the price of a 4ke setup. And unlike the 4ke and 7ke gear you really don't have the option of runnning a stock ECU (not that I'd run a 4ke or 7ke ECU anyway), but you can have something like a microtech digi for under $200 these days.

Oh and most of those quads use a weber side draft mounting flange so finding a manifold to use them on your K isn't hard at all.

 

Another thing to bare in mind when considering fuel injection is the ignition side of things, as they do tie in together. Without going into too much detail you have 3x main ignition setups to choose from:

1, Coil negative trigger - This only required a fuel only ECU, but on the other side of the coin you don't have the option of ECU controlled ignition. You can also retain you points dizzy in the setup.

2, Single pulse triggering - This requires a electronic dizzy as a trigger, and you still need to use the dizzy and rotor button for spark distrobution. You can control your ignition curve from the ECU however. This setup does NOT support multi point ignition - ie 4x coil packs/waste spark.

3, Dual pulse triggering - This is the best option,..... but also obviously the most expensive. You need to basically turn your stock dizzy into a crank angle sensor (CAS) by using parts from a later model car, or adapt a crank trigger wheel onto the motor. This setup allows you to run multi point or waste spark ignition.

[altezzaclub]

Oh.. Now I understand this!

 

Group: Tech Moderator

 

:P

[Taz_Rx]

:wink: he just got me on a good day when I was bored at work.