Okay, this is probably me just being over paranoid but I'll ask anyway.

I have to upgrade to bigger injectors because I want to run on E85.

I was looking at the SARD 800cc injectors and they offer two types - High and Low impedance. The Low impedance have a lag-time of 1.7 seconds and the high impedance have a lag time of 0.75 seconds. And I think stock gen3 is about 0.6 ish.

So, to my paranoia - I know the PFC can correct for the additional lag-time but I am wary of having to correct a large amount with the low impedance (1.7ms lag time) injectors.

Any views on whether correction of a large difference is not as good as correction of a smaller difference ? Or is the ECU doing everything so fast that it makes no difference ?

Also, the low impedance injectors are drop-in, whereas with the high impedance, I just need to disable the resistor pack (small job).

And - prices of both High and Low impedance are the same.

Spidey, I have a feeling only Quandry will really have input here, but hopefully you get some opinions. Try talking to Tim in TB?

I'm no expert but IMO it's all happening so fast that there's not a huge difference... the lag settings for the 800's are supposed to be .16 - I played with mine and found that the car idled best at .18

If you ran the high impedance injectors, you would be running .02

Even in computer terms its difficult to see a difference of 16ms unless you're dealing with large amounts of data. In this case all you're telling the ECU is to fire the injectors .16ms earlier than what it normally would.

Quandry wrote:
I'm no expert but IMO it's all happening so fast that there's not a huge difference... the lag settings for the 800's are supposed to be .16 - I played with mine and found that the car idled best at .18

If you ran the high impedance injectors, you would be running .02

Even in computer terms its difficult to see a difference of 16ms unless you're dealing with large amounts of data. In this case all you're telling the ECU is to fire the injectors .16ms earlier than what it normally would.

Strange - I checked RHDJapan and they have the low impedance drop-in 800s as 1.7ms, which would give a correction factor of about 1.1.

And they have the high impedance 800s as the 0.75, meaning it would be nearer the 0.16-0.18.

Did you definitely get the low impedance versions ?

Scratch that - when I looked at a single low impedance 800, it was down as 0.75. Panic over !

I'll cross reference it against another site and check to make sure that its a typo on RHDJapan