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ROM Editor is Windows based editing software for the s200 which allows you to change
the ignition and fuel tables in the ECU, as well as several other
important parameters. You need an EPROM programmer (like the Pocket
Programmer) to burn EPROMs for the ECU.
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Custom Tunes
More custom tunes have been built into ROM Editor, saving you
time when tuning a new vehicle.
Improved Base Fuel Maps
When creating new ROMs it is possible to adjust the part
throttle portion of the fuel tables to suit larger injectors
(the changes detailed on
injector
sizing have been incorporated). This reduces part throttle
tuning time.
| Program EEPROMs from ROM Editor |
Under Windows NT, 2000 and XP it is now possible to burn the
Atmel 29C256 EEPROM from within ROM Editor. Select 'Burn EPROM'
from the file menu. A very convenient feature which will save
you lots of time.
| Air conditioning cutoff (s200 only) |
Shut the air conditioning compressor off automatically for
increased performance when you need it.
| Extended RPM Tables (s200 only) |
Fuel and ignition tables are tunable to 11,000
rpm on all supported OBDI ECUs. This allows more precise control
of fuel and ignition at high rpm.
| Improved VTEC Options (s200 only) |
- VTEC switching has been changed to switch based on
engine speed and engine load.
- VTEC can be disabled entirely for non-VTEC engines
- The VTEC pressure input can be disabled for JDM Type R
engines.
- By disabling the VTEC spool the ECU can be configured to
extend the fuel and ignition tables to 11,000 rpm for
non-VTEC engines.
Japanese P08 ECU supported.
| Disable Sensors (s200 only) |
More sensors can be disabled. This is useful for Asian ECUs,
or for race cars with sensors missing.
| File Comments (s200 only) |
You can save a description, comments or tuning notes in the
ROM file.
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| Fuel & Ignition tables |
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The Honda ECU has two ignition and two fuel tables, so that there
are separate tables for the low and high speed cams. Each table is
divided into rows and columns, with engine revs being indexed by
row and engine load indexed by column. Hondata expands the factory
table size to allow additional columns for boost. Typically the
factory 20 x 10 tables are expanded to 20 x 16 cells for the low
cam and 24 by 16 cells. This provides 704 tuning positions, more
than most replacement ECUs.
Pictured is a 3d representation of a low speed cam ignition
table. Visualizing the table in 3d helps you pick any incorrectly
entered data and to understand trends. The blue area selected with
the mouse can be increased or decreased in value 1/4 of a degree
at a time. This accuracy of timing is needed for maximum boosted
and naturally aspirated power.
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| Tuning the ECU |
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Changes made to the fuel & ignition tables, or other settings,
can be saved to a file and written to an EPROM
using an EPROM programmer. ROM Editor will interface to two EPROM emulators,
allowing the ECU to be updated very quickly. With the RaceLogic
emulator changes can be made in real-time while the car is running
on the dyno.
ROM Editor can datalog from the interface box. This is useful
while tuning so that the position of the tables which is being
used can be viewed in real-time. Here
is a quicktime movie (550 kb) which shows ROM Editor during a dyno
run. The car is run through the gears before the dyno run so that
the engine is at the same temperature for each dyno run. The red
spot is the position in the table which is being accessed by the
ECU.
With a wide band lambda meter and Emulator it is possible to
use RomEditor to Autotune the
fuel tables.
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| Changing injectors |
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The fuel tables can be scaled with an injector multiplier (fuel
trim) for different sized injectors, fuel pressures or even engine
capacity changes. The picture shows the how you could recalibrate
a stock P28 Civic EX computer with higher fuel pressure and bigger
injectors to drive a turbo H22A Prelude. This gives you huge
flexibility in recalibrating OBD I ECUs for a variety of engines
in a variety of tunes.
Managing your fueling this way allows you to remove inaccurate
devices like rising rate regulators which also can place the stock
injectors under extremely high fuel pressure and reduce their
life. Throttle tip in and cranking enrichment can be altered to
suit your injectors and engine.
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| Map Tracing |
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This is an advanced feature that allows your laptop to record
the path your ECU takes through the maps. Once recorded you can
replay your dyno or road run and see exactly which fuel and
ignition value your ECU was using at every RPM and load position.
By replacing the stock oxygen sensor with a wide band Lambda
meter such as the PLX, you
can record a very accurate air/fuel ratio in real time. This makes
it very fast and very accurate to tune your engine to a specific
air/fuel ratio without using a dyno.
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| Changing MAP sensors |
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The stock MAP sensor can see boost up to 11 lbs. For
higher boost levels a 3 bar MAP
sensor can be used. The only change you need to make in ROM Editor
is to check the '3 bar MAP sensor' box.
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| Updating ROM Versions |
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To update the rom version from either a 2.5 version ROM or from an older
version 3 rom to a newer versio do the following:
- Open the file in Romeditor
- Click on FILE
- Click on Convert ROM Version
- Select what you are going to convert to (v3 ROM's being updated to latest
version just reselect the correct ECU)
- Click Ok
- Save the file
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- Hondata s200 and Datalogging.
- Windows 95, 98, ME, 2000, NT or XP.
- Pentium 133 with 32 MB minimum.
- Pentium 400 with 64 MB recommended.
- Keyspan
USB-serial adapter for newer laptops without a serial port.
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