NSX AEM EMS adapted and tuned to run the Legend engine.
As told on the Acura-Legend.com forums.
Before we get into it, I’d like to thank Imran (Legend4life) for getting this
whole thing started and helping me start out mine. I'd also like to thank Ken-
yup you were right. (Kenso) and Matt (Sr5guy) for putting up with my questions
and concerns.
The NSX AEM EMS is currently running my car!
With that said, IMO It’s been 90% street tuned. A 1 and a half hour of drive
home from my tuner (Midnight Performance) in Sacramento, CA gives me this
confidence. We spent about 5 hrs tuning with moderate breaks and it gained a bit
more power all over the power band, along with a much smoother driving
experience.
My prior best dyno peaks from two separate dynos were 228WHP and 224LBFT. The
best together was WHP 225 WTQ224.
Tuned under the EMS the Peaks don’t change dramatically (best separate dynos
WHP227-WTQ229), but I’ll take the increase in TQ.
Looking within the powerband, from 3k all the way out to 6k there’s an 5-10TQ
increase. Add to that very clean power delivery and almost perfect A/F as shown
in the dyno below.
What’s it take to convert over to the EMS?
Not a whole lot besides tuning. You can buy wire harness extension; it’s handy
but not necessary from Science of speed. Buy an NSX EMS 1002, have a fast laptop
and a good serial to USB adapter. Load up latest versions 1.19 NSX cal.
Connect the EMS, square away laptop communications config to the EMS (ignition
power needs to be on) and configure the TPS sensor. Pull up the fuel map and
adjust the bottom-right KPA 5 rows up and 8 rows across with 3.00. This should
start the Legend right up.
Do not drive the car like this.
Idle should be anywhere from 800-2000 at this point and the rest of the map
needs to be tuned specifically to your engine by an experienced tuner.
Don’t make the mistake of driving on an untuned EMS or else you may risk your
engines life. Don’t say I didn’t warn you.
Take to your nearest experienced tuner and have them tune the rest out.
Wideband is a must.
It’s really that simple.
I
Again don’t go driving on it until its fully fine tuned for your engine.
*****UPDATE********
With the EMS, the fuel pump will stay on at 2nd click ignition. The stock legend
ecu will prime the fuel pump then switch off, the EMS will keep it on
continuously. This is due to the fact the NSX uses a separate fuel relay while
the Legend incorporates its ignition and fuel together into what we call the
"main relay".
The fix would be to convert over I assume.
It doesn't pose any problem as long as you don't have it on for a long time.
When I was testing and didn't need to start the car, I would pull the FP 20amp
fuse under the dash.
Below is a gallery of the setup.
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