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Request For Help: No Vct On R33 Rb25

paulr33

By paulr33,
in Engines & Forced Induction

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

MBS - This isnt a debate about ECU's. What you think might/might not be better or whatever else.

This is about getting VCT to work with the RB26 PFC.

If you lot are going to continue the ECU debate, go to another forum. We dont need another ECU vs ECU thread thats about as useful as tits on a bull.

Paul - as you said, is it viable.

I would say at thism stage yes. $500 saving is what it could cost to tune the car. So thats value if it can be done cheap.

If not, i'll buy your RB26 PowerFC as i need one lol :(

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NicsR33 Experienced

NicsR33

Posted
Posted

my mate gets all his supra parts from here: www.greenline.jp he has already spent about $20k with them and he says its top stuff.

they sell R33 PwrFCs new for a conversion rate of around $1400AUS. i emailed the a couple days ago about buying them in a bulk, not sure how much it can go down by. hopefully aswell the shipping wont cost too much too. ill keep you posted.

made_guy Experienced

made_guy

Posted
Posted

ahh looks like paulr33 is canning the rb26 -> rb25 power fc loom thingo - looks like we shoudl organise a group buy if we can maybe we could get the price down to $1200 with enough of us?

Simon-S14 Grand Master

Simon-S14

Posted
Posted

hey guys thought i'd add my imput. I would personally run a 3rd party RPM based switch to control the VCT, then it becomes a set and forget affair. Something like a NOS controller, or similar. Gizzmo make a adjustable cam controller which would do the exact same job, basically it will be an on and off switching device that can be set at the right RPm points.

FWIW the Gizzmo device is expensive, so i;'d be looking at jaycar offerings or NOS controllers.

  • 4 months later...
The Mafia Grand Master

The Mafia

Posted
Posted

This thread never got updated - I completed it (with help from cubes) and got the RB26 Powerfc working for both the RB25 and RB20.

I even have a video of me driving around with the RB26 one in.

  • 4 weeks later...
Cubes Grand Master

Cubes

Posted
Posted

A little update again. :)

This modification most definitely needs to have a wideband slapped on the car from the word go as there's a few little issues with the afm curve, afm selection and coolant temp correction. Strangely enough not all cars are equal; some cars have near spot on afr's with a simple tweak of the airflow yet others require fiddling.

The car will appear to drive fine but afr's are really way off mark, definitely not recommended to drive around on for any length of time.

The VCT controller is easy; use a NOS controller as Simon suggested above. The US sell them for dirt cheap. ~$50 for an adjustable nos rpm window controller.

I've looked in to the jaycar solution and its difficult to get working not to mention it has to be slightly customised.

The rpm window controllers than can be had from the US are cheap, compact, already assembled and just work. :D

I've had the 26pfc running in my 32 for some time now; its returning excellent economy ~450km's per tank (50L) but on average 430km's.

No open road driving all local short trip (<30mins) 60-80km/h type. I feel its still got a little more economy in it as I haven't really tweaked the water temp correction which has a reasonable impact on economy for short trip driving.

  • 1 month later...
discopotato03 Grand Master

discopotato03

Posted
Posted

Hi Cubes , I'm curious to know why the Jaycar simple voltage switch has issues . I guess the question is do you set it to switch from an rpm or an airflow meter signal . I'm thinking if its workable from the MAF's load output voltage you could make it work a bit more intelligently than the std computers engine speed signal - if thats how the std system works .

Cheers A .

Cubes Grand Master

Cubes

Posted
Posted

Hey Adrian,

The std vct system works directly off RPM and nothing else. It essentially turns on increasing overlap at 1100-1300rpm and then back off at 4700rpm ish reducing overlap to aid top end with that restrictive turbo std scroll.

I do get where your coming from; having an airflow based vct controller could work but it would require a lot of fiddling. ;)

It could result in a of buggering around for what could result in a tune thats never quite right due to the essentially rpm variable vct controller. A lot of coulds in there lol. Without some loss there's would be no gain. ;)

With regards to RPM controllers; I don't feel the Jaycar kit is suitable primarily due to its cost and need for modification when you can buy a controller thats designed for the purpose for $50 or so.

But yeah.. RPM variable vct controller; interesting concept. Would be interesting if there would be any real gains.

How does Ford's inline 6 infinite variable cam controller work? RPM based and or inj. duty/airflow based?

I guess thats one for google of which I currently don't have enough time for. :wave:

  • 2 months later...
PM-R33 Grand Master

PM-R33

Posted
Posted

Sorry to bring up an old thread.

This "adjustable nos rpm window controller" that you guys are talking about, where the hell do you get it from? Can someone throw me a link or a part number, i had a look on Holley's website for nitrous controllers and it doesn't seem to list it unless it's called something else?

http://www.holley.com/types/Nitrous%20Controllers.asp

I wanna get the VCT running on my car because the Microtech doesn't run it and it seems like a bit of a waste to not get some free low end power. Is someone actually running one of these on their car?

Thanks guys.

  • 3 months later...

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