removing the rev limiter

jeffast · Post by **jeffast** » Fri Jun 06, 2008 2:31 am

i need a diagram of the ecu for an impreza/legacy, i am building a rally car and useing a mild build on a motor for a bit till the radical one gets done. i am running solid lifter heads, and a few other goodies. but any way i want to be able to rapp the motor out to 7500 rpm. any one know how to remove it?

PhyrraM · Post by **PhyrraM** » Fri Jun 06, 2008 2:36 am

To remove it from the stock ECU would involve a custom EPROM.

I'm not sure who can do that affordably.

A standalone is most likely your best bet considering your other mods.

def09 · Post by **def09** » Sat Jun 07, 2008 1:58 am

I was looking for this also for a friend racing his Legacy on a 3/8 circle track. Some MSD igition units have adjustable rev limiters but I cant get a answer on if it can over-ride the ECU's set limit.

PhyrraM · Post by **PhyrraM** » Sat Jun 07, 2008 5:10 am

No it can't. The ECU fires the coils directly, so when the ECU hits rev limit, there will be no signal to 'override'.

def09 · Post by **def09** » Sun Jun 08, 2008 7:40 pm

Bummer...but thanks for the response phyrram.

mxpunk · Post by **mxpunk** » Sat Jun 21, 2008 9:08 pm

find "storm" on nasioc/rs25, he can hack the ecu's and raise the rev limit to whatever you need rilly.

Post by **Legacy777** » Tue Jun 24, 2008 8:59 pm

More then likely, he can only do that on the OBD2 ECU's.

ciper · Post by **ciper** » Tue Jun 24, 2008 9:44 pm

With the 02 WRX and all DBW cars its VERY EASY to change the rev limiter. In fact you can even add a custom rev limiter at say 4k RPM that automatically disengages once VSS1 has a signal for launch control!

b3lha · Post by **b3lha** » Thu Jun 26, 2008 12:11 pm

Depends what ECU your car has. Some Legacies between 1992 and 1996 use the same JECS OBD1 ECU as the SVX. But I think it's only the non-turbo cars, not the Turbo versions. I have been doing some work on my SVX ECU and I know where the rev limit is stored and how to reprogram it. If you have the same ECU and are good with computers and electronics then drop me an email and I'll explain it to you.

jeffast · Post by **jeffast** » Sat Jul 05, 2008 5:37 am

Legacy777 wrote:More then likely, he can only do that on the OBD2 ECU's.

just to bump this, storm can raise the limit to 7,500. he charges like $50 plus shipping for you to send your ecu to him. then he mails it back with the higher limit. he has like a 1 week turn around time. you can contact him on nasioc

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removing the rev limiter

removing the rev limiter