DKWalser

Okay. What kind of performance improvements might one expect with just the EZ chip, stock 19# injectors, and stock exhaust?

PorKen

It's going to feel 'perkier', even at part throttle. The cats will clip max HP and TQ but there should be more torque everywhere.


Unlike the stock EZ chip (or a ST'd chip), the S4.S300s chip is always adjusting the overall advance level depending on fuel quality and the weather. This is on top of custom learning of the WOT map by individual cylinders (in 64 RPM cells vs. stock 16). Once the best retard level at a particular RPM for each cylinder is found, the overall advance level can be higher for all cylinders.

Mongo

You boosted guys take all the fun. What about those running stroker motors that want Ken's chips?

ptuomov

Ken -- Could you make the WOT ignition map additive to the base map instead of a fresh map?

Mongo

Does anyone have PDF instructions on how to install both chips?

M_E_C

Hey Ken, Quick question. I have a set of Autothority chips from an experiment a while back. Would your v1.1 EZ work better with the AA LH chip or the stock chip? Would the AA chip's higher fueling in part throttle allow more advance?? Just wondering?

Lizard928

The AA chips are garbage, toss them and just use Ken's chip

PorKen

This is partially true - I'm going to start making BMW Liftbars.

If anything I'd get off my high horse and rework the LH chip for rebuilt 19# injectors.

Unfortunately, I optimistically used the space for the stock high rpm single-pulse-per-rev code for some of my new code so I'd have to move that (not trivial with hex code).

I suppose, but I'm not sure it would be that helpful? The stock cruise map tops out well below the full throttle load threshold so it would only be adding to one row anyway?

If I do get some time for programming this winter I thought about expanding the EZ patch I made to the cruise map by using the two extra cruise maps for individual cylinder(s) and retard respectively.

The AutoThority fuel chip is crude, jump a fuel dump in the 3/4 load range (no other changes including rev limit) so it wouldn't help that much, but it wouldn't hurt.

As Colin says, avoid the ATy EZ chip.

ptuomov

That was just me thinking turbo. Unlike with the N/A system, the transition path from the part load to full load takes a different path on the MAP depending on the initial conditions.

Another thought. If you have two full ignition maps, one with more advance and one with less advance, you might be able to store a look-up table which cylinders use which map at which rpm. That would be eight bits per rpm cell for the lookup table plus those two full ignition maps.

Stromius

Been running the EZK chip and fully agree it has livened things up. "Mera krut i maskinen" so Swedes say.

Mongo

Bump

Has anyone dynoed an automatic S4 with cats and S300s (EZ and LH chips with 24lb injectors) yet? I am curious to see the numbers.

Speedtoys

Ken:

Is it possible for an S300 chipset for 36lb injectors?

I have 36's on hand from the white car..thought I would ask.

Mongo

I have an odd question for you Ken.

I was recently looking at the Sharktuner Alpha-N system allowing the use of a MAP sensor to replace the MAF. I think John Speake's tuning system uses a special box to convert the signal for the Sharktuner to read the voltage based on pressure.

What are your thoughts on making an 'S400' using a MAP type setup for the 928? I would love to ditch the MAF and go MAP.

Some obstacles I forsee:

-A newer, more accurate TPS must be used for the relationship between MAP, load and engine temperature

-Custom 'black box' that will require the MAP, TPS and Temp II sensors to connect to for communication.

While it may seem like more trouble, your maps will be significantly more accurate.

Rob Edwards

Why would the maps be more accurate?

The only real advantage of MAP is for non-stock intakes, it doesn't make any more power than with a MAF if everything else stays the same. I ran my GTS on Alpha N to learn how to control it in preparation for Greg's intake, but it wasn't any better than stock.

ptuomov

I agree. MAF is the best for a street car. That's why car factories use it almost exclusively in high-end models.

The MAP system would be pretty good for hot-rodded and boosted cars, though.