ECU's that run only high impedance injectors can run low impedance but need an in line ballast resistor? I have heard about this but have never done so and not being an electronics expert I don't know the in' & out's!!

Is it a good idea? Pro's & cons?? What value resistors?

 

Not ideal mate. It works but its essentially a bodge in my opinion as it removes the whole benefit of using a peak and hold injector in the first place.

 

I have been down this route, digging the info out for you now

 

actually what stu is saying it wrong.......














...fooled ya

 

lol

 

Doing so will slow the injectors operation down, which isnt ideal.

 

What you need is one of these to be fitted Martin, which i have on mine.



Link on thw item itself >> http://www.fjoracing.com/products/injdrvr/

 

Don't do it, just get the right injectors - can put a detrimental strain on the ECU.

 

oops, didnt read the post propely:



Good idea?
Not really IMHO


Pros?
You dont have to buy new injectors when changing to an ECU that needs high impedance injectors

Cons?
It slows the injector opening down, which in turn:
makes it more difficult to map the voltage compensation table
reduces the maximum BHP supported by an injector (ie the bad point of swapping to a smaller injector)
loses you resolution at the bottom end of the map (ie the bad point of swapping to a bigger injector)

 

Yep, thats the proper way to do it if you need to use the existing low impedance ones.

 

The ECU is designed for high impedance and that is what it sees, the injector drivers in the ECU wont know the difference, it wont strain them.

 

oooh, thats cool.

thes the peak/hold ever change tho? ie would this device give you identical functionality to an ecu that natively supports it, or would you still lose some control

 

Ive not used that product myself, I would hope it senses current draw though to know when to switch from peak to hold, and thus works as per a native ECU without you ever needing to configure anything.

 

just for mike

 

Tosser .

All fine and dandy while the resistors are working okay, but if one fails, it has the potential to destroy the ECU.

 

FPMSL

If one fails in what manner?
Suddenly become less resistance?

Thats FAR more likely to happen on a high impedence injector like you are suggesting he uses, as it is what they do when the coils burn out, than it is on a resistor, which if they fail at all they tend to INCREASE in resistance, not decrease.

You dont half talk some shite Mike

 

Who supplies 1000-1200cc high impedance injectors

 

Bosch?

 

Link ?

 

The Balast resistors ive used are only resistors in name, its a box with circuitry etc. & fits between ECU & injectors, bit more to it than you are assuming.

 

I take it that it's similar to what Luca posted? I am not assuming anything, I'm asking.. Did you not see the question mark!! At the moment I don't even need to do this but I want to understand the score as T2 only does high impedance.

 

You can get Saturated ones:

http://www.t1raceparts.com/ProductDe...Show=TechSpecs

Not sure about peak and hold.

 

Makes you wonder how Rich made 453bhp with all those cons. .

You lads need to go away & find out about how this is done before you all start being experts. I expect Mark is grinning again at all the experts.

 

Who in their right mind would want to run four 1000cc injectors anyway?

 

Rod- when you learn something/anything, you'll realise peak power figures have very little to do with anything

 

I run 4 750cc injectors with Ballast resistors. All made for me by Rodders - king of the wiring loom

 

Typical wank arrogant response Rod If you don't want to bring anything worthwhile then leave the building...

 

Why do you want to run with resistors? aren't there injectors that do what you want? Say for a 450bhp cossie?

 

Is that aimed at me? If so I don't want to run with resistors I'm simply asking and wanting to learn.

If it's aimed at Rich I guess it so he can use the injectors with his chosen ECU which has generated all that extra power

 

bottom line cost/ease of fit /reliability has to be change the injectors.
but will work with a resistor, all this talk of slowing the injector down is pointless as ecu injector timing is largely based around a time issue and that is what the parameters in the ecu are there for to adjust for time i.e injector opening time. the extra time involved with resistors would not be an "extra factor" or anymore time consuming than mapping for injectors without resistors.

 

Sorry Martin it was aimed at Rich. So what would you choose then (Martin) for 450 bhp on, say, a P8?

 

Mine runs with resistors because thats what i was given. I have 0 idea how they work, 0 idea why i need them and 0 idea why they are considered a bodge. All i do know is they/it are/is working fine on mine

 

the "power" an engine makes isnt a good reflection on how well each component is working!

 

Just use Siemens black injectors.

 

You sound like the perfect customer

 

Nice spelling

Gonna try your route. GT30. but with the P8..

 

A lot of the Honda's use a resistor pack, I always thought it was a little fudge to overcome the problem of changing injectors and avoid over driving the PWM output of the ECU....

Cost of a set of injectors nowadays i'd have thought it would now be just as cost effective to buy the right injectors for any particular job...

 

Whats wrong with my spelling?

Im sure whatever route you take as long as you can get the air flow into the engine then all will be fine

 

no spelling issues there as far as i can see

 

Sorry might not be spelling but very diplomatic sentence lol

Yeah think I'll be copying your setup lol. Seems you are happy with it so can't be bad