Why do i have to rev my 1jz vvti to avoid stalling on cold start? (microtech)

[bosslock]

heyhey. i have a 1jz vvti running on a microtech lt16. starting it cold. even on a warm day i need to rev it to keep it alive. Is there a cold start plug in or what can i do?
cheers

[dumbass]

cant do anything hehehe
thats factory microtech
how does the vvti go
really fast?

[mullett]

Yup, that's microleb ECU. I imagine it doesn't have adaptive idle up control (or most likely it doesn't have the ISCV connected at all). You can do some tricky stuff with the fuel/ign maps, but it can cause issues at other points. If that's the only driveability issue you've got, you must have got a good installer/tuner!

I'd also be surprised if they connected the vvti...

-RM

[Draven]

basically that's a poor ECU choice for that engine - I'm 99% sure microtech can't do vvti (and definitely not well), so you'll be losing out a lot on responsiveness there... if you're looking at modifying, I'd be considering a new ecu

[gttv8]

Haven't played with Microtech for about 6 years, but it wouldn't be my choice for this engine. The Microtech does have a cold start feature that you can play with to change the cold strart fuel which wont affect the main fuel map. As Draven said I doubt the Microtech is controlling the VVTi, as I couldn't find any reference for the LT-16 supporting variable cam timing. Definately change ECU's.

[dnegative]

Microlebs are good for rotors and not much else, far better options out there

[bosslock]

Thanks lads. wgat would be my best option?
Is it a big job to swap ecu???

[Draven]

google aftermarket ecu vvti and have a look

Also depends hugely on what your budget and technical expertise is as to whether it's a "big job" - but at the least you'd be paying for an ECU and a tune, which are not cheap items.

Autronic, Haltech, Wolf, Motec and Megasquirt all do vvti in their higher end/newer models... basically everyone except microtech

[dumbass]

Link or vipec
Easy to use and set up
Which ever ecu u get yr budget will be 2 to 3 g maye more
By time get it running properly

[mullett]

Adaptronic will be ideal for this. Dual channel VVTi control, adaptive idle, adaptive fuel and ignition...and given that you're in the East, excellent support as well. I can't speak highly enough of them, and the base model 'select' ECU will do everything you need. Just find a workshop that you trust to fit it and tune it!

-RM

[dumbass]

I just can't handle adaptronic software
It's not user friendly or easy to understand

[bosslock]

Far out. my tuner has done a.fair few 1j with microtechs. wiah he.mentioned it earlier. its goes well. but feels like somethings missing. like it doesnt go like a newish engine with vvti.
I make 230 hp with 13psi with intercooler 3" all the way zaust boost controler.

[Draven]

Far out. my tuner has done a.fair few 1j with microtechs. wiah he.mentioned it earlier. its goes well. but feels like somethings missing. like it doesnt go like a newish engine with vvti.
I make 230 hp with 13psi with intercooler 3" all the way zaust boost controler.

with similar mods I made ~300rwhp... the microtech was a good (read: cheap) ecu for a non-vvti 1jz in an older car, because there was nothing complicated to do (cold start could still be a little annoying during the coldest days in winter).

It's just not the right ecu for newer cars/engines

[Rhyno]

Just wanted to add my 2 cents,

My daily ride has a Gen 1 3sge running an lt10-s, x4 box and four bosch ignition coils. I live in Darwin which even in the cool part of the year is fairly hot, and every morning I go to start my car sometimes it will turn over and get away on the first turn off the key, other days it will try and run, splutter a bit and die. After the 2nd to 3rd attempt it gets away no worry, don't ever need to use accelerator to keep it alive.

On another note, I always let my engine heat up to 60 degrees, before I eve put it in first/reverse - even at very low throttle, like less than 10% the car feels slugish. As soon as she is warm at 82 the car drives like a dream.

Haltech is the shiznit

[JP]

The vipec & current Link ECU's are awesome with toyota reluctor and vvti setups, they'll control the 1jz's ISCV perfectly too.. Adaptronic's also work well but I'm also not a fan of their interface/datalogging.

I'd agree that you're about 60-70hp down on where the power should be. If you are going to change ECU's, I'd be hoping whoever installed the microtech didn't mess with the factory triggers/teeth to get it running.