Based on the information I've been reading in the Fuel injector threads, type II vs III etc, which injectors did you tune with and which do you recommend?

Thanks

 

Ken used some unicorn injectors which are very rare. In theory the ford racing 24# injectors look ok, but maybe Ken will have more user-feedback on that?

The unknown is the injector opening time. Ford Racing injectors are well documented, but most injectors its pretty much a case of having to measure them to get figures.

 

I have Ken's v1.1 EZ chip in my 89 S4 AT, 19# injectors, stock LH, X-pipe, 300cpi cats. Dyno results from recent tests:
293 whp, 303 torque


Stock baseline from about 2 years ago, same dyno.
260 whp, 271 torque.


Just wondering what results others are getting. Trying to decide whether to do the injector, LH upgrade or not.


Thx.

 

MEC , did you have the X pipe at 260 hp , or is the 33 hp all the chip ? X pipe are about 25 hp by themselves .

 

I still have to put both chips and injectors in. No time for anything nowadays... however, those numbers do excite me.

 

260 was before the xpipe, but after the top end refresh so right about what a well running s4 should make. So the 33hp increase is a combination of chip and xpipe. I'm not sure how much the xpipe added but I am running with cats (300 CPI). I wanted clean air more than an extra 5 hp.


The difference from x-pipe to x-pipe with the chip (I only have the EZ chip) is quite noticeable.

 

The LH chip will make it more responsive and provide more consistent fueling which will make the EZ chip work better, but most all of the power upgrade comes from the ignition chip. Because the S4.S300s EZ chip is always self-tuning for best performance it works fine with the stock LH chip.

Because of the issues that often occur with changing to new injectors I recommend just getting the ignition chip anymore unless you are installing it yourself and have time to sort out anything that pops up.

 

I haven't installed mine yet, still have to cut grooves in the injectors, this is interesting.

So when I do get to it, base line dyno as is.

Add the EZ and dyno that.

Change fuel injectors add the LH and dyno again.

Anything I'm missing?

 

Porken:

I have a set of Bosch green 36# injectors here at home, would it be possible to use those with your chips?

 

With the EZ chip (roll your own LH).

The LH is tuned for 24#.

 

Are you saying you no longer recommend changing to 24# injectors with your new chip? I just want to be certain I'm understanding things correctly. When you first released your S4 chips, I was going to buy a set until I found it too difficult to find the new injectors.

 

If you install the two-chip package, EZ and LH, then you need 24# injectors.

If you get the EZ chip only then you keep the stock 19# injectors and stock LH chip.

 

I assume Ken refuses to map an LH chip to a higher injector flow rate because he has a life outside of the 928 realm.

 

I'd assume its because their would be no reason to run larger then 24# on a NA car and if you were boosted and needed the larger injector you wouldn't be using his chips.

 

They work pretty well with his chips if you run e85. It handles the lean-WOT issues because of the lesser BTU and therefore running AFR numbers of e85.