6A13 N/A specs

[darth_grantius]

Hi guys,

I am looking for some information about my ST-R's engine - its a ex-Jap import and I was wondering a few things:

Does the jap St-Rs have 9.0:1 or 9.5:1 CR?
What octane in this engine would get better fuel economy and power - can I get away with using 91?
Would putting a different air filter on it increase economy and power?
What power do the Jap 6a13 NA's put out?

Or if anyone has a spec sheet on the non turbo's, that would be great!

Also, does anyone have any information on how the logic of the INVESC-2 works? I want to know how fast it learns and what it learns?

Cheers

[crazydriver81]

here you go: http://exchange.goo-net.com/catalog/...EGNUM/4006287/

http://www.goo-net.com/catalog/MITSU...287/index.html

The car is optimized for jap fuel. Using 91RON fuel will cause less power and more fuel consumption. The v6 N/A does like to drink much fuel, esp. with the AT box. It is nearly the same fuel consumption like VR-4 but with 100hp less.

A different air filter (like K&N replacement filters) will cause more fuel consumption. Nothing more...

The INVECS-II autobox will need some kms to learn and settle. Approx 200km I would guess...

[darth_grantius]

here you go: http://exchange.goo-net.com/catalog/...EGNUM/4006287/

http://www.goo-net.com/catalog/MITSU...287/index.html

The car is optimized for jap fuel. Using 91RON fuel will cause less power and more fuel consumption. The v6 N/A does like to drink much fuel, esp. with the AT box. It is nearly the same fuel consumption like VR-4 but with 100hp less.

A different air filter (like K&N replacement filters) will cause more fuel consumption. Nothing more...

The INVECS-II autobox will need some kms to learn and settle. Approx 200km I would guess...

Thanks mate - this has cleared up alot for me.

Another question, what about going downhill with the throttle off completely - does the 6A13 feature the ability to shut off the injectors when engine braking?

[Nick Mann]

The 6A13TT definitely does. I'd be suprised if the 6A13 doesn't. On the twin turbo, injector duty cycle drops to 0 when completely off the throttle and revs are significantly above idle speed. I've not noticed exactly where injector duty cycle starts up again, but I'd guess somewhere between 1500 and 2000 rpm.

[darth_grantius]

The 6A13TT definitely does. I'd be suprised if the 6A13 doesn't. On the twin turbo, injector duty cycle drops to 0 when completely off the throttle and revs are significantly above idle speed. I've not noticed exactly where injector duty cycle starts up again, but I'd guess somewhere between 1500 and 2000 rpm.

Oh awesome! thanks for that! Even with the Auto box?

My engine idles when warmed up at around 450 -500rpm, and about 800rpm with A/C on. I used to drive my neighbors Pajero with the 3000cc when I worked for him, it idled about that as well. Is that too low for an idle? Ive owned other V6's (nissans) and they have idles at more then that, unless it is just misti's?

[Wodjno]

Inj Duty Cycle starts back up at approx 1100 rpm

[crazydriver81]

Oh awesome! thanks for that! Even with the Auto box?

My engine idles when warmed up at around 450 -500rpm, and about 800rpm with A/C on. I used to drive my neighbors Pajero with the 3000cc when I worked for him, it idled about that as well. Is that too low for an idle? Ive owned other V6's (nissans) and they have idles at more then that, unless it is just misti's?

Please adjust the idle screw in the throttle body. 500rpm is too low. Should be 700rpm with A/C off

[Davezj]

i noticed this last night when i was logging with evo scan, injector duty cycle drop to 0 when throttle was closed completely. i didn't think much of it at the time, but it makes sense now.

[Wodjno]

i noticed this last night when i was logging with evo scan, injector duty cycle drop to 0 when throttle was closed completely. i didn't think much of it at the time, but it makes sense now.

Nice gains in fuel economy can be had if you use this to your advantage

[Wodjno]

Just logged the point of where DC starts back up in 5th and 4th. It was 980rpm for 5th and 970rpm for 4th. This was just letting the engine brake the car, not with foot brake.

Wodj

[Wodjno]

4th GearIMAG1089.jpg5th GearIMAG1088.jpg

[darth_grantius]

Just logged the point of where DC starts back up in 5th and 4th. It was 980rpm for 5th and 970rpm for 4th. This was just letting the engine brake the car, not with foot brake.

Wodj

Hmmm anyone know if this also does it with automatic, and what RPM on the 4 speed box?

[Wodjno]

Hmmm anyone know if this also does it with automatic, and what RPM on the 4 speed box?

My reply was via Tapatalk so didn't complete my post . I was going to add that the above points are for a Manual and an Auto will probably be different. Possibly it will be near the same, but can't remember exactly from when i had an auto. Possibly the 1100rpm that i thought it was on my current car, maybe for the Auto? Sure someone can check for you Also expect the difference in the rpm's per gear above are only because the rpm drops faster in lower gears.

[darth_grantius]

My reply was via Tapatalk so didn't complete my post . I was going to add that the above points are for a Manual and an Auto will probably be different. Possibly it will be near the same, but can't remember exactly from when i had an auto. Possibly the 1100rpm that i thought it was on my current car, maybe for the Auto? Sure someone can check for you Also expect the difference in the rpm's per gear above are only because the rpm drops faster in lower gears.

DO the Japanese cars use OBD2 or do i have to find an obscure JOBD etc? would like to see fuel economy on my laptop.