Rb20 Ecu With Nis Tune To Run In Rb25-30

[Line 3]

hi everyone

i have a r33 wth a rb25-30.

i have a rb20ecu with a nis tune chip. has anyone got there rb25-30 running with a rb20 ecu?

i have upgraded turbo, pistons, injectors, fuel pump, q45 afm, front mount intercooler and full turbo back exhaust.

my mechaic has told me this ecu cant be tuned so we are trying the standard computer next. he has told me to get a apexi power fc if he cant get it to run. because its running too rich.

i have contacted toshi off the forums and he said he can tune the rb20 computer to suit the engine.

has any one had this experiance before??

any help will be much apreciated

thanks

[StevenCJR31]

yes it can be tuned to run you 25/30 but the 20 NIStuned ECU wont support the VCT (if you still have it)

[Line 3]

I'm not running VCT but thanks for the help

[XRATED]

Your mechanic sounds like a bit of a numpty....

I ran my old 25/30 using the standard rb20 loom, sensors and ecu with a nistune. Ran up around 330rwkw fairly easily with the t67.

Just make sure you have the install all sorted out, then take it for a tune. The car wont really run unless it's been calibrated for bigger injectors, bigger afm etc.

Cheers

J.

[Line 3]

He told me he can't tune the rb20 computer because I think he dosnt no how. He told me the engine is running too rich because of the bigger injectors.

Toshi said he can come tune it for me on the dyno.

My mechanic said not to drive it aswell because it's running to rich.

I'm running a rb25 loom in mine

[XRATED]

As long as everything has been installed correctly, the tune will fix your rich problems.... The nistune is every bit as good as a power fc.

Cheers

Justin.

[Line 3]

Yeah that's what I'm getting him to look over now.

Thanks mate your info really helped and I'll be booking the dyno in as soon as I can.

Cheers

[XRATED]

It will be beneficial to activate the vct too... I used an msd rpm window switch to activate the vct solenoid, only a couple hundred bucks all up. get the car towed to the dyno with a fresh set of plugs, fresh oil change- filter etc. It's not going to run untill it's tuned for the larger injectors and larger afm.

Another thing to look at before you hit the dyno is the power feed to the coil pack loom. I'd run a larger positive wire to the loom through a 30/40 amp relay. Clean your coil pack boots, run a larger earth cable from the earth point at the ign pack/head to the chassis and run a .8 gap (I've always used bpr7es ngk plugs). This will give your ign system the best chance of holding high boost/combustion pressures.

Cheers

Justin

[StevenCJR31]

It will be beneficial to activate the vct too... I used an msd rpm window switch to activate the vct solenoid, only a couple hundred bucks all up. get the car towed to the dyno with a fresh set of plugs, fresh oil change- filter etc. It's not going to run untill it's tuned for the larger injectors and larger afm.

Another thing to look at before you hit the dyno is the power feed to the coil pack loom. I'd run a larger positive wire to the loom through a 30/40 amp relay. Clean your coil pack boots, run a larger earth cable from the earth point at the ign pack/head to the chassis and run a .8 gap (I've always used bpr7es ngk plugs). This will give your ign system the best chance of holding high boost/combustion pressures.

Cheers

Justin

can i ask where you got your MSD window switch from? are they easy to wire in and setup?

[XRATED]

I got mine from JEGS from memory. If you can wire up an aftermarket headunit, you can wire this in. Just remember the vct solinoid is a negative switch.

You can buy the plug for the vct solinoid from any automotive electrical supplier or fuel injection place.

Cheers

Justin