Rb25Det Vct With Microtech Ecu

[JetVL]

Hey guys just need to know how to get the VCT working on r33 rb25det when using a Microtech LT12S??

Or is it not a big deal if it doesn't operate?

Thanks. Josh

[51NNA]

Microtech LT12s has an AUX output, you need to set up a relay thats triggered from the output, the AUX can be set with RPM on and off. Should see a decent midrange gain from the VCT, it will have to be retuned.

Edited May 11, 2012 by 51NNA

[JetVL]

Thanks 51NNA, That sounds good.

Im stil getting the engine ready to put in (going from rb20det) so planning re-tune anyhow.

Cheers mate.

[Rolls]

why on earth are you using a microleb ?

[BrynDETT]

why on earth are you using a microleb ?

fark it annoys me when ppl post garabage like this about computers... Im sure it will do more then enough for what most ppl neeed.... I never had a problem...

[51NNA]

Yep, most of my cars run Microtech's, never had a problem.

[GTR260]

Nothing wrong with microtech's, i've had 3 car that run them! They never gave me any problems an did everything i needed it to do, no point in buying a ecu with all the bells and whistles if u never use them!

[Rolls]

fark it annoys me when ppl post garabage like this about computers... Im sure it will do more then enough for what most ppl neeed.... I never had a problem...

Doesn't mean it is a good idea to run it !

I bet I could set up a carby blow through set up on my rb25 and it would be "good enough" and if it worked I could say "without a problem" as well.

The stock ECU has better tunability than a microtech, it has more features and does an all round better job at every single part of running a car.

You have paid money for a down grade.

Nothing wrong with microtech's, i've had 3 car that run them! They never gave me any problems an did everything i needed it to do, no point in buying a ecu with all the bells and whistles if u never use them!

You are right I don't ever use my nice cold start, my idle air valve control that automatically adjusts when the AC comes on, I also don't need fuel economy via an O2 sensor.

[GTSBoy]

Actually Rolls, fuel economy is one place where it is so much easier with a Microtech than with Nistune. It's really hard to lean out the cruise section in Nistune. It's a doddle with a Microtech.

You cannot argue against the statement that a Microtech actually does a decent job of running a fairly simple engine like an RB. Sure, you miss out on a few things, but they do work, and are fairly easy to tune (once you're used to their arse backwards electronic carby way of doing things). I'd much rather have a Microtech than pretty much any Haltech that's ever been released.

[Rolls]

Yeah I know they work, but the lack a lot of the handy factory features that the factory ECU has. You can lean out cruise on a nistune the same way if you want, just turn off O2 feedback and pull fuel out until you are happy, or if you are lazy just leave the O2 feedback on and it'll be about the same as the factory fuel economy if you don't stuff things up too much.

[The Sherrid]

quote by rolls, "I like to construct strong views on random things, and then argue for absolutely no reason about them." some one needs a hug? anyone in Adelaide can help out?

before you flame me rolls, i agree with you about functionality of the nistune, however they carry an awsome reputation for results built from racing results! They are designed for high reving rotary's with fast and reliable processing time.

[Guilt-Toy]

microtech sucks compared to the ecu's out today.... but you cannot forget back in the day they were miles infront of the rest

[steve200b]

I thought you could turn the aux on but not off at the desired rpm for the vct. I have used the eboost street for boost and vct control on all the rb30det builds.

[Rolls]

quote by rolls, "I like to construct strong views on random things, and then argue for absolutely no reason about them." some one needs a hug? anyone in Adelaide can help out?

before you flame me rolls, i agree with you about functionality of the nistune, however they carry an awsome reputation for results built from racing results! They are designed for high reving rotary's with fast and reliable processing time.

Awesome rep from back in the day when they were a great ECU, it is like getting a magazine from the 90s where windows 95 and a pentium 200 was amazing, doesn't mean it still stands up that well today, sure if all you want to do is run excel from the nineties it probably does it well (eg running a rotary that used to be carby fed), but once again doesn't mean it is great today.

There "fast and reliable processing time" is slower and no less reliable than any new ECU.

Edited November 30, 2013 by Rolls

[PSI086]

They are an absolute bucket of shit. Customer support is pathetic, you can't do a thing with them unless handing over wads of cash and the software sucks balls. We had to send a rb25 one back to get something as simple as a thermo fan output enabled, which is yet something else they charge you for.

The vct can be turned on and off in the aux screen.

[Dose Pipe Sutututu]

Actually Rolls, fuel economy is one place where it is so much easier with a Microtech than with Nistune. It's really hard to lean out the cruise section in Nistune. It's a doddle with a Microtech.

what? just highlight the cells you want and press 'O' then drop the value to whatever you want.. it's dead beat simple... I've used Microtech before, it's so damn confusing.

1x table for RPM vs. Timing, then 1x table for Timing trim vs. Load... no sure why they just didn't want to use a 3D map like other people.

[GTSBoy]

what? just highlight the cells you want and press 'O' then drop the value to whatever you want.. it's dead beat simple... I've used Microtech before, it's so damn confusing.

1x table for RPM vs. Timing, then 1x table for Timing trim vs. Load... no sure why they just didn't want to use a 3D map like other people.

Yup. Unless you wanted to keep closed loop. And perhaps you've not tried to do it on a more modern Nissan ECU? VE tables make it hard to know if you're achieving anything at all. You can't switch off feedback on a per cell basis on those anyway.

I'm not defending Microtech by the way. They are unpleasant to tune, as I stated in my original post. But especially back when the only Nissans being played with were RB20s and CA18s, they did a good job, and did return excellent fuel economy - far better than stock.

[Dose Pipe Sutututu]

Yup. Unless you wanted to keep closed loop. And perhaps you've not tried to do it on a more modern Nissan ECU? VE tables make it hard to know if you're achieving anything at all. You can't switch off feedback on a per cell basis on those anyway.

I'm not defending Microtech by the way. They are unpleasant to tune, as I stated in my original post. But especially back when the only Nissans being played with were RB20s and CA18s, they did a good job, and did return excellent fuel economy - far better than stock.

I do find that the Nistune O2 closed loop is funny, it's quite lazy. I prefer to just set at stoich of the bat for idle/cruise etc. and I turn it off as it comes on song. It tries to stoich coming onto boost which makes the car feel lazy. I've only ever used it on a R33 and S15s nothing newer so perhaps you're right.

[Rolls]

Do many people tune nistunes with the O2 feedback off?

[Dose Pipe Sutututu]

Do many people tune nistunes with the O2 feedback off?

you always need to disable O2 feedback whilst tuning, then re-enable it once you're done.. however I just leave it off completely on the idle/cruise cells.