I know more top shelf tuners that tune Haltech and have faith in Haltech than tuners of any level willing to mess with Megasquirt.

I understand MS's price bracket puts it in a lot of cheap builds. But when I was in the industry, we'd joke about 'it just needs a tune' meaning the whole damn car needs to be redone, and cars on Megasquirt were overwhelmingly more likely to need a lot of additional work before being dyno ready. Worse still, the MS2/MS3 cars that were put together pretty well just always had more bugs and hiccups and random stupid issues related to the ECU and mapping and sensor inputs etc than any other ECU our shop supported, including old AEM V1's.

So yes, I'd absolutely jump all over the Haltech if you had a good Haltech tuner in your area.

 

I believe the 2500 is worlds above the MS ... There are tons of tuning capabilities in there, not the least of which is the long-term trim learning. Check out the Haltech videos.

I have an Elite 2500, Wideband Controller and Expansion box sitting on the shelf waiting for warmer weather in a couple of months for '94TT. Was originally going to be for the stock twins while moving to a VVTi head, but I think I'm going to switch to single with an FSR Street Fighter kit

What are your aims with the wiring harness ? Why not use the existing stock one ? In my case I'll be using the stock harness, but (big but here) NOT cutting it up. I'm re-using various connectors (EGR vsv, Idle-air-valve vsv etc) by building a small/short patch harness for each.

For example, for oil temp and pressure

I got an Idle-air valve male plug to plug into the harness female end. That will go to a pair of plugs for the oil temp and pressure sensors. No cutting of stock harness.

ECU <--> stock harness <--> IdleAir I1 female connector <mates to> IdleAir I1 male connector <--> OilPressure sensor connector

Yes I'm a geek. Whole google-sheets spreadsheet with all the connectivity, checks for pin re-use etc. If you're interested I can make a public version.

 

I have been doing a lot of ECU research at the moment and would say the Haltech 2500 100% over the MS, but this is dependant on a tuner that you trust.

I have been speaking to a few tuners and there are ECUs that they are most familiar with, and without saying it they will give you a better tune on their prefered ECU, What i am getting at is that if you have a trustworthy Haltech Tuner in your area then go for it, but if they prefer Link then I would go with this.

Yes I'm a geek. Whole google-sheets spreadsheet with all the connectivity, checks for pin re-use etc. If you're interested I can make a public version.

I would be interested in this spreadsheet.

 

Great replies!
I have one of the older ms3x ecus so my engine harness is literally hacked up and a mess. I actually don’t have any electrical issues and everything works but I’m lacking the consistency in the tune. My ms is not tuned in ve based but in pulse width and I think that has a lot to do with it.

I’ll give you a run down of my car to help. 6 speed stock block, vvti head with gsc s1 cams. Bw 366 turbo on a spf1 manifold. Fic 1650s r35 coils.

 

Locally we call MS the megash.t for a reason. I would 110% upgrade to the 2500

 

Have a look

Supra Haltech wiring

docs.google.com

 

This is amazing, thank you sooooo much.

 

I have tuned both and can tell you that you can make both run to perfection with the right skills. If you want to upgrade as that might get you with a better tuner, then by all means do that. But I wouldn't listen to the advice that your getting that just upgrading the hardware is going to do it. A megasquirt in the right hands can run a supra perfectly like stock.

 

Well I made a decision. Going with a Haltech elite 2500 with wideband controller. Having a custom milspec harness made and will be tuned by crispeed.

 

What exactly is required on a 2j to run the elite . Asking what add ons must be purchased

 

Depends on what you actually have ... Stock twins with all the vsv's ? MAF or MAP ? Single with just a wastegate ? Any other sensors ?

There's a link above for my in-development wiring map for my '94 TT with an Elite 2500. It's currently set up for stock twins, but I think I'm going to bite the bullet and go single. Big change is going to drive-by-wire, so need inputs/outputs for the DBW motor etc.

In my case I got the Elite 2500, a WBC-1 wideband single-channel controller, and an IO box for an extra 4x AVI inputs, 4x SPI inputs and 4x DPO outputs. I have 1x AVI input and 3x outputs free. Going single will free up another 3x outputs.

Can never have too many inputs ... That's the one downside to the Elite 2500 - need/want the IO Expander box (or two).

 

all this was required for stock twins? i was going to run a V2 but decided to go with a 2500 elite for stock twins setup.

 

All I’m going to use the the haltech ecu, Haltech wideband controller and plan on adding some sort of can gauge. Either bti or Haltech

 

So for a na-t Setup on map setup , all I need aside from the box itself is wideband controller and pnp patch harness..

 

You can use the internal map sensor but I think the limit is 20 psi or something around there. I went with an aem 5 bar map sensor.
Iat sensor in the pipe and I think that’s it.

 

From what I’ve heard any wideband will work but the dedicated Haltech wideband uses the can system and will have faster response and be more accurate