JDM ECU...HP Increase?

huck369 · #1 06-20-2010, 06:37 AM

I have in my possession a JDM SVX ECU (and TCU), anyone know if it would give any gains in HP or Torque, when plugged into a USD SVX?

Sean486 · #2 06-20-2010, 07:46 AM

Where did you find that? I thought they very hard to come by.

1986nate · #3 06-20-2010, 08:36 AM

Quote:

Originally Posted by huck369

I have in my possession a JDM SVX ECU (and TCU), anyone know if it would give any gains in HP or Torque, when plugged into a USD SVX?

I don't believe so Huck. The main difference is that the JDM won't look for anything related to the EGR since JDM motors didn't have them.

huck369 · #4 06-20-2010, 12:49 PM

Quote:

Originally Posted by Sean486

Where did you find that? I thought they very hard to come by.

A XT buddy Down under bought a JDM clip, I got a few things from him before he scrapped it.

Quote:

Originally Posted by 1986nate

I don't believe so Huck. The main difference is that the JDM won't look for anything related to the EGR since JDM motors didn't have them.

I was hoping for a more definite than "I don't believe so"...anybody know for sure?
Thought I might drop it into FrankenWedge(which is currently running a 95 US-ECU...)

Cam · #5 06-20-2010, 12:52 PM

Test it with your butt dyno

huck369 · #6 06-20-2010, 12:55 PM

I may throw it in to see if I can "Feel" any difference...I don't figure it can hurt any.

longassname · #7 06-21-2010, 08:41 AM

I'll trade you a stage 1av1 for them. That will make your car faster.

huck369 · #8 06-21-2010, 11:00 AM

I'll Probably take you up on that Mike...

Sean486 · #9 06-21-2010, 11:13 AM

My though was that the TCU would be extremely valuable to someone looking to swap in a JDM auto transmission. Especially since they are available and cheap. But even better would be to have someone reverse engineer it then offer it as an TCU upgrade option on their website. (hint, hint LAN)

Not sure if such a thing is possible, but I can hope!

b3lha · #10 06-24-2010, 05:56 PM

Quote:

Originally Posted by huck369

I have in my possession a JDM SVX ECU (and TCU), anyone know if it would give any gains in HP or Torque, when plugged into a USD SVX?

Do you know what year they are from?

The JDM ECU maps are different to USDM, they are optimised for higher octane fuel. Like Nate said, no EGR. I've run a JDM car on a UK ECU which is similar to maps and didn't notice any performance difference.

The TCU won't work properly with a USDM gearbox.

Quote:

Originally Posted by Sean486

even better would be to have someone reverse engineer it

Already been done.

TomsSVX · #11 06-24-2010, 06:40 PM

Quote:

Originally Posted by b3lha

Do you know what year they are from?

The JDM ECU maps are different to USDM, they are optimised for higher octane fuel. Like Nate said, no EGR. I've run a JDM car on a UK ECU which is similar to maps and didn't notice any performance difference.

The TCU won't work properly with a USDM gearbox.

Already been done.

JDM TCU hardware is different as well.... Needs to interpret the speed sensor signals properly. Even with JDM firmware the US TCU will not take into account the proper speed from the #1 sensor to match the #2

Tom

huck369 · #12 06-24-2010, 07:02 PM

I don't recall, and Michael has them now, he might be able to cross reference the numbers to find out.

b3lha · #13 06-25-2010, 03:26 AM

Quote:

Originally Posted by TomsSVX

JDM TCU hardware is different as well.... Needs to interpret the speed sensor signals properly. Even with JDM firmware the US TCU will not take into account the proper speed from the #1 sensor to match the #2

Tom

Are you sure you're not confusing it with the Euro/Aussie TCU? JDM and USDM use the same speed sensor arrangement.

I've inspected the hardware of JDM, USDM and Euro/Aussie TCUs. The JDM and USDM are almost identical. The only difference is a couple of extra components on the USDM (presumably to handle the atmospheric pressure signal).

I built some custom TCUs for Ron based on JDM firmware running on USDM hardware and they work very well.

The Euro/Aussie unit is very different. They use the different speed sensor arrangement and don't work properly with JDM/USDM firmware.

TomsSVX · #14 06-25-2010, 04:45 AM

Positive... Even with the JDM firmware loaded into the US TCU of mine, the forward speed sensor was not reading the same as the rear

Tom

longassname · #15 06-26-2010, 07:48 AM

I got the JDM ECU and TCU from Huck. They look to be 94 JDM units matching what Phil already has on his website.