Drum_Guru

I was just reading on Hondata's site that you can use an eprom emulator to change data like fuel/timing maps in real-time while the car is on and running... is this just for tuning so you can make minor, single point adjustments quickly w/o having to turn the car off, or can you use this to completely switch fuel/ignition maps if you decided to turn on the nitro while you sit at a red light...

also, I own a 98 prelude, so if I wanted to run the s200, would I have to buy a new ECU? it makes it seem that way on the site. Or do I just need the OBDII to OBDI harness?

Thanks for the help!

Drum_Guru

here is the section of the site for refference... http://www.hondata.com/techroms.html

Thanks again everyone!

Spunkster

Nitrous control is built into the s100 and s200 systems, so there is no need to change eproms to engage nitrous.

http://www.hondata.com/featuresnitrous.html

Drum_Guru

I guess im just dumb... lol. so you dont need new fuel maps for nitro, just the ignition retard which is done automatically by the hondata?

Also, I am going to have an intercooled turbo setup (obvious) but above and beyond that, I am adding an "interfreezer" (like air to water intercooler, only CO2 runs through and freezes the housing) for the coldest air I can possibly get... If I switch that on, there would be even more air because it is even colder and therefore more compressable... would I need different fuel maps for that? If I do need different fuel maps, this interfreezer is something I can easily activate from inside my car, so I would like to be able to switch fuel maps just as easily and Im hoping a real-time emulator could do that. Is this possible?

Thanks everyone!

SleepyEG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drum_Guru &raquo;</TD></TR><TR><TD CLASS="quote">If I switch that on, there would be even more air because it is even colder and therefore more compressable... </TD></TR></TABLE>

I'm not sure what you're trying to say, but more importantly it doesn't matter if the air density changes at the intercooler for your ECU. If it's a different density when it gets to the manifold, then you will get different fueling. You do not need different maps for a colder charge to answer your question.

Drum_Guru

alright cool... I just figured that the colder the charge the more densse it was... therefore req. a different fuel map...

the way it will be set up, is a normal intercooler that obviously functions all the time and then a device that super-cools the alreay intercooled air when it is activated... colder = more dense right?

slim9300

You have a P13 ECU, which isn't compadible with Hondata. You will need an OBD-1 P72 or P28 ECU and an OBD-2 to OBD-1 conversion harness, the P72 is preferable because you can still control the intake manifold butterflies. With the P28 you will have a little less mid to low range power due to the inability for the ECU to control the butterflies.

I am running a P72 with Uberdata, which is the same as Hondata if you didn't already know. I didn't need the conversion harness because I am already OBD-1. You can look at my setup in my sig also.

If you have any more questions, just ask.

Conlan

Drum_Guru

alright.... thanks man... but im pretty sure that my ECU is a P72...

boosted_dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SleepyEG &raquo;</TD></TR><TR><TD CLASS="quote">

I'm not sure what you're trying to say, but more importantly it doesn't matter if the air density changes at the intercooler for your ECU. If it's a different density when it gets to the manifold, then you will get different fueling. You do not need different maps for a colder charge to answer your question. </TD></TR></TABLE>

i think you may be mistaken on this. ive seen dyno charts with the nitrous ntercooler setup used and the car goes lean cause the change in intake temps. i have also heard of people useing the nitrous control feature on hondata to use the ntercooler system.

Landon

Drum_Guru

yeah exactly.. more air needs more fuel... So can anyone answer my question? Can the hondata with a real-time rom emulator completely switch fuel maps while the car is running???

Thanks!

slim9300

You do have a H22A4 motor, right? Unless you changed your factory H22A4 P13 ECU to a P72, you have a P13. The P72 is a Integra B18C ECU, it just so happens that because GS-R's have the dual stage intake manifold butterflies it will work for the H22's butterfly system. Also, I don't think the public can buy the emulator, I believe you must be Hondata certified. Not to mention, I don't think it's as easy to use as you assume. With Uberdata you could have seperate chips, so that way one is tuned for nitrous and the other N/A. Then when you go to the track or something, you could just change the chip in the ECU. The chips would work the same way with Hondata in theory since Uberdata and Hondata are identical, just don't know if Hondata's "encription" would confuse the situation.

Drum_Guru

here we go... excellent... someone tried to answer my questions, thanks! Ok cool, so its a P13. Also, there are multiple rom emulators that will work with hondata, so they are available but thanks for the heads up though...

so you are saying you dont think i could change whole fuel maps with this setup?

kpt4321

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted_dc2 &raquo;</TD></TR><TR><TD CLASS="quote">
i think you may be mistaken on this. ive seen dyno charts with the nitrous ntercooler setup used and the car goes lean cause the change in intake temps. i have also heard of people useing the nitrous control feature on hondata to use the ntercooler system.
</TD></TR></TABLE>

This doesn't make sense.

The ECU has a whole bunch of "stuff" to compensate for changes in air temperature. If it did not, than you would go crazy rich when you boosted your car, and the A/F atio would change A LOT at different times of the day.

I remember another thread about this about half a year ago. The concensus is that if your car is going lean, or rich, or anything, when the air temperautre changes by am amount that really is not that large, you have an engine management or tuning issue.

kpt4321

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drum_Guru &raquo;</TD></TR><TR><TD CLASS="quote">yeah exactly.. more air needs more fuel...</TD></TR></TABLE>

Yeah, it does. What that has to do with the car leaning out, I don't know.

The ECU knows that more air needs more fuel. Otherwise, you're A/F ratio would be whacked out whenever you drove at night and then during the day, or on different days, or different seasons.

Drum_Guru

yeah thats true... duh, the ecu does that for you...

anyways, can someone answer my question... even though it apparently doesnt atter...

CAN THE HONDATA WITH A REAL-TIME ROM EMULATOR COMPLETELY SWITCH FUEL MAPS WHILE THE CAR IS RUNNING???


Thanks!

Drum_Guru

come on... no one has an answer?

Drum_Guru

Someone just hook it up with a simple answer... someone has got to know this...

Can the Hondata With a real-time rom emulator completely switch fuel maps while the car is running?

Thanks yall!

SleepyEG

Why would you want to do that is the question? No one is answering because it doesn't make any sense. All the info you need is earlier in this post, I'm thinking you didn't read it.

slim9300

I don't believe YOU can buy a real-time ROM emulator. Maybe I am wrong, but I don't think they are available to the public yet. However, it is obvious that you can buy a burner that will write Hondata, Uberdata, Crome, etc. chips which will "completely switch fuel maps."

Even if you came across a real-time ROM emulator, I don't think it would be practicle to do what you are saying. IMO

DaX

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slim9300 &raquo;</TD></TR><TR><TD CLASS="quote">I don't believe YOU can buy a real-time ROM emulator. Maybe I am wrong, but I don't think they are available to the public yet. However, it is obvious that you can buy a burner that will write Hondata, Uberdata, Crome, etc. chips which will "completely switch fuel maps." </TD></TR></TABLE>

Wrong. Anyone can buy the real time ROMulator.

Finest

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drum_Guru &raquo;</TD></TR><TR><TD CLASS="quote">Can the Hondata With a real-time rom emulator completely switch fuel maps while the car is running?

</TD></TR></TABLE>

Simple answer: No.

With the Transtronic emulator, you'll need to turn off the car to download to the EPROM. Maybe with a fast computer, you might be able to get away with tuning in small increments, but I wouldn't try it.

I believe the Racelogic emulator can tune on the fly, but it can't program ROMs with the Hondata. You'll need their software to be able to tune with their emulator.

If you're only wanting a new map for nitrous, then the Hondata's nitrous control will work. Even if you're adding the IC CO2 cooler it won't make that dramatic of a change where it requires a totally new fuel/ignition map. If anything, you'll just be running "safer" (less prone to detonation), not necessarily making more HP.

K.I.S.S. Keep It Simple Stupid. One tune, one goal. If you need more than that, then I have a nice shiny VTECH activation L.E.D. that you might want to buy, it'll trigger a 3rd stage of VTECH called SUPER VTECH!

Drum_Guru

cool thx...