Microtech Ltx12 Ecu

[tyra skyline]

i have a gtr33 vspec and want to install a microtech ltx12. if install can my 4wd still work , because the 4wd systems has it own computer. and operate from the main computer.

[Guilt-Toy]

i have a gtr33 vspec and want to install a microtech ltx12. if install can my 4wd still work , because the 4wd systems has it own computer. and operate from the main computer.

You are frigging crazy if your going to destroy such a nice car with a microtech. your driveability will go out the window.. sure you can still get heaps of power.. but it will drive like crap!

you can wire it up with the stock computer so it would work.. but the big question is.. why wouldnt you go for a PFC or something decent for such a nice car?

[rob82]

You are frigging crazy if your going to destroy such a nice car with a microtech. your driveability will go out the window.. sure you can still get heaps of power.. but it will drive like crap!

you can wire it up with the stock computer so it would work.. but the big question is.. why wouldnt you go for a PFC or something decent for such a nice car?

Amen to that. The problem with multiple throtlle bodies is that you have a very poor vacumm signal at low throttle angles which means you have to tune tps vs rpm based until you have enough vacumm on board so you can switch over to speed density based tuning. Dont defile your gtr by putting a microtech on it when a PFC has twice the features for less cost. If you do go map based then put an autronic SM4 on it and get it tuned by someone reputable.

[Shaun]

Listen to these dudes mate. Ive had an LTX 12 running my R33gtr engine and it sucked sooooo bad. It didnt idle well at all and was a dog to drive. It was tuned by and apparent Microtech god (north of Sydney) and it was a complete waste of money (> $1200 for the tune i think). Ive since changed to an Autronic SM4 and its chalk and cheese compared to the Microtech. The difference really is unbelievable.

If you dont mind an AFM go the Power FC for ease of installation and tuning.

Microtechs work excellently on rotories but for some reason dont work well on piston engines (comparitavely).

Shaun.

[Guilt-Toy]

You can get a microtech to work good on a piston engine but you wouldnt destroy a 32 33 34 gtr or gtst with one.

they have to be re tuned quarterly BUT they make big power.

If BIG power is all you want and you dont intent to drive your car around the streets the microtech may be the way to go..

Otherwise your wasting your time. get a jetro Power FC and be done with it.

[psybic]

Idiots.

Back that up.

Microtech is an awesome ECU. Ever run one??? Ever installed one???

I have done both. They are easy to install. They improved my response and driveability on BOTH my piston engines!

SR20 making 158rkws on 9psi. Know many SR20's that do that? Look at the power curve. Does it look undriveable?

The computer is only as good as the tuner. If people have had dealings with useless tuners, don't blame the hardware.

Your advice is not helping this guy.

[psybic]

The best way for you to install is to run the stock computer. Makes cold start easier too.

That way the microtech just controlls, ignition and fuel. ofcourse it has the ability to control many other things. It will be easy to install, just get the pin out diagram, give it the TPS, water temp, CAS, then out puts to injectors and ignition modules, also its MAP sensor and thats about it.

It will drive on base map, go get it tuned. $300 for full tune at RX Engineering. don't know where u are tho...

[MattSR]

While I agree that Dribbletech are crap, I have a problem when people say

"they have to be re tuned quarterly...."

[Shaun]

Idiots.

Back that up.

Microtech is an awesome ECU. Ever run one??? Ever installed one???

I have done both. They are easy to install. They improved my response and driveability on BOTH my piston engines!

SR20 making 158rkws on 9psi. Know many SR20's that do that? Look at the power curve. Does it look undriveable?

The computer is only as good as the tuner. If people have had dealings with useless tuners, don't blame the hardware.

Your advice is not helping this guy.

He asked for our advice. Ive had experience with the LTX12 on a 33gtr engine and it was terrible. I agree totally that a car is as good as the tuner, and guess who tuned my car mate. RX Engineering. I blame the computer (in relation to the application) AND the tuner. The whole exercise was extremely dissappointing and expensive!

Have you used an Autronic?

I laugh at your SR20 making 158kw. Surely its not in a Gazelle either!

[R31Nismoid]

Its an SR20, not an RB26

have you have expirience psybic with doing it to an RB26?

Its pretty much useless talking of your expirience with a single throttle bodied SR20 when the 6-throttle RB26 is whats being discussed

[rob82]

The best way for you to install is to run the stock computer. Makes cold start easier too.

That way the microtech just controlls, ignition and fuel. ofcourse it has the ability to control many other things. It will be easy to install, just get the pin out diagram, give it the TPS, water temp, CAS, then out puts to injectors and ignition modules, also its MAP sensor and thats about it.

It will drive on base map, go get it tuned. $300 for full tune at RX Engineering. don't know where u are tho...

You cant just splice into the loom and piggy back the ECT and TPS as the internal biasing of the standard ECU will be different to that of the microtech. That means you need an additional ECT sensor to be drilled and tapped somewhere.

By the way you cant show drivability on a dyno graph and if you've ever seen a scoped a microtech timing signal you would would not be very impressed with what you saw.

I have tuned a throttle/speed density based microtech on a GTIR (4 individual throttle bodies), I have also tuned the factory computer on a GTIR and there is no way I would recommend a lebotech on any thing with multiple throttle bodies.

Edited April 19, 2006 by rob82

[psybic]

Its an SR20, not an RB26

have you have expirience psybic with doing it to an RB26?

Its pretty much useless talking of your expirience with a single throttle bodied SR20 when the 6-throttle RB26 is whats being discussed

Nope. Still, closer talking about any turbo piston engine than stuff people think with no back up.

He asked for our advice. Ive had experience with the LTX12 on a 33gtr engine and it was terrible. I agree totally that a car is as good as the tuner, and guess who tuned my car mate. RX Engineering. I blame the computer (in relation to the application) AND the tuner. The whole exercise was extremely dissappointing and expensive!

Have you used an Autronic?

I laugh at your SR20 making 158kw. Surely its not in a Gazelle either!

Yes it is a gazelle, why wouldn't it be? Its only 158rwkw cause its only 9psi and its only 2.0L. the point was, that is good for that engine, and it was acheived with a microtech. You have seen them make more on less boost have you? Why do you laugh?

Sorry I used a dyno sheet to show responsiveness, it was the only thing I had to aid my argument. As that is no good, just trust me, my driveability is much better than it was before.

He actually DIDN'T ask what you thought of microtech, he DID ask about if 4WD would still work? Did anyone else talk about how to hook the microtech up so it would?

I can see this turning into a MAP vs MAF debate aswell as ECU wars. Why not stay on topic?? How to use the microtech so that the other computer controlled features remain.

[NXTIME]

I've driven an LTX12s GTR with 600+HP up and down the coast on a daily basis (not just around the block); it drove and idled perfectly with very good fuel economy and never missed a beat. Goes back to the saying that an ECU is only as good (or bad) as its tuner.

However, unless you are chasing huge power, I would recommend a power FC.

[paulr33]

Whilst max power tunes i would expect work on any ecu, its the bits in the middle that count. how often would someone drive a street on max throttle from idle to redline over and over? its the bits in between that count

cold start

warm start

idle

low throttle response

light load + cruise

any ecu can make good max power, even a stock ecu remapped can

[N I B]

Because we have good plugin ECUs both MAF and MAP why wire an ECU when you have to piggy back or stuff around building TPS signal inverters for the 4WD.Horses for courses Wire ins are for cars that have no good plugin options. I dont know of any ECU that has to be retuned without any changes so the quaterly tune quote is not right.

[tyra skyline]

i have a apexi power fc on the car at the moment with these mods ,

apexi fuel pump

hks gt2530 turbos

tomei 260 9.15 in and exhaust cams set a +2 IN & -4 EX

nismo fuel pressure regulator

standard injectors

THE CAR STILL FEEL THE SAME WITH THE NEW CAMS INSTALL .

if i change the injectors to 700cc can some one send me a mapping with fuel and ignition

[MerlinTheHapyPig]

SR20 making 158rkws on 9psi. Know many SR20's that do that? Look at the power curve. Does it look undriveable?

158kw from an sr20det at 9psi is nothing to write home about, i wouldn't attribute that to the tune either, you could tune it with any ecu and get that power figure, nothing special about the microtech

i've seen 175kw from an sr with a t28bb at 10psi with a powerfc, and it had a great torque curve.

I disagree that any aftermarket ecu has a "flaw" that makes it idle like crap, or run poorly. You'll probably find it's installed incorrectly or tuned incorrectly or one of the engines sensors is broke.

there is logic to the multiple throttle bodies argument, and perhaps a map sensor based ecu could be the cause of ecu non-suitability. i mean the only person who is supporting Microtech hasn't used them on an rb26....

[Guilt-Toy]

Microtechs are not such a bad ecu. My issues with them compared to a PFC is.

Map sensor - does not drive on the street like a power fc or a quality ECU (Autronic or Motec)

Lack of knock sensor monitoring

Microtechs are good for wankels or a FJ20 / whatever any type of older engine that you want to through them at.

When you start getting into RB25DET's RB26DET's or any newish engine a microtech can destroy the way the car drives.

Has anyone tried to tune a Microtech ?? they are SOOO easy to tune its not funny I can tune one easily on the street and it would be even quicker on a dyno. Tuning a PFC is much harder.

I noticed with the microtech that you cant get the AF ratios spot on 100% of the time like you can with a power FC on cruise - you can get them close and close is good enough in most cases but with a Power FC you can be pretty sure that your going to get the same AF ratio on the same load point time after time (as long as everything else is the same fuel / air temp etc etc)

I would suggest anyone who has a skyline above a r31 should go for a Power FC and stick with the AFM. I run a Q45 90mm AFM.

My opinion is that the AFM will allways sense map position better then a map sensor for the main reason that all the air must travel through the AFM and its read before even going into the turbo.

The map sensor uses a really small line that only senses pressure in the line so how long does it take for the computer to get the right signal ?? wouldnt it be a little lagged ???

Just does not feel as safe to me (IMHO its MY opinion) to rely on such a small line to run your engine - this would be the reason why the microtechs dont run as good as the Power FC on the street in cruise as it does not get the correct signal in time ???

Anyway whatever you choose.. Go the Power FC.

[R31Nismoid]

i have a apexi power fc on the car at the moment with these mods ,

apexi fuel pump

hks gt2530 turbos

tomei 260 9.15 in and exhaust cams set a +2 IN & -4 EX

nismo fuel pressure regulator

standard injectors

THE CAR STILL FEEL THE SAME WITH THE NEW CAMS INSTALL .

if i change the injectors to 700cc can some one send me a mapping with fuel and ignition

So your only wanting to use a microtech because you dont "feel" a difference after changing camshafts?

golly gosh.

Was there a power band shift before/after?

You really need injectors to make the most of what 2530's have to offer. They go far beyond what the stock items can supply in terms of fuel.

Your probably only running 16-17psi?

[psybic]

So your only wanting to use a microtech because you dont "feel" a difference after changing camshafts?

golly gosh.

Was there a power band shift before/after?

You really need injectors to make the most of what 2530's have to offer. They go far beyond what the stock items can supply in terms of fuel.

Your probably only running 16-17psi?

Woah, now I'm lost.

My point before was that the guy asked if you could still stock ECU features with microtech, then everyone arked up about how shit microtech was, even though it was so not the time.

Why you would get rid of a power fc for a microtech... i'm not so sure on that one....

anyway, i still think i came closest to answering the initial question of how to hook up a microtech so 4ws and shit still works.... lol