Turbocharged AW11 MR2

Post by **brentp** » Thu Apr 05, 2007 3:15 pm

My Autocross competition vehicle and R&D platform

1985 Toyota MR2
Megasquirt and MJLJ for engine managment
Turbocharged 4AGZE engine
Mitsubishi 14B turbo
Ford Probe Turbo intercooler
+endless more modifications

dan · Post by **dan** » Thu Apr 05, 2007 6:37 pm

that looks fantastic! really subtle, i bet it shifts well with all that power in such a small package!

Post by **brentp** » Thu Apr 05, 2007 10:11 pm

It is a little monster. Still scares me at times.

I need to do some work on it to get it healthy again. I have some mechanical ticking sound, I think from the valvetrain. I say 'ticking' instead of 'knocking' hoping to convince myself the problem is in the top of the engine and not the bottom..

molecular bob · Post by **molecular bob** » Fri Apr 06, 2007 11:14 am

Hello Brent

Neat looking MR2. I noticed that you have a megajolt and a megasquirt on this car. I assume that the 'jolt is doing sparks and the 'squirt is doing fuel. How are you driving the 'squirt? I ask as this is the long term plan for my Caterham crossflow, and i had assumed that i would have to loose the jolt to free up the sensors on the crank and tps (though as your car is turbo i guess you are running MAP), and run spark and fuel from the megasquirt.

Thanks in advance

Ian Brock

Post by **brentp** » Fri Apr 06, 2007 2:52 pm

Hi Ian,

Yep, the MJLJ is providing the tach input to the Megasquirt using the TACH_OUT signal. Works very well.

Here's a picture of the equipment rack showing both units. the reservoir at the end is for an intercooler sprayer, controlled by one of the MJLJ outputs (set by boost level). The MJLJ at the time the picture was taken is my first V2 prototype unit.

minty9277 · Post by **minty9277** » Sun Apr 29, 2007 6:53 pm

Brent

I am currently running Megajolt 3.0 TPS on my Tiger Supercat 1800 Zetec, optioned with Shift lights. I plan on adding the map switching soon.

I also am planning on changing to Fuel Injection using megasquirt however I can not work out if I can run both in parallel. I see that you are. However is it only possible if using Megajolt using MAP?

Thanks in advanced, great work

Ian

Post by **brentp** » Sun Apr 29, 2007 7:16 pm

Hi Ian,

In my setup the Megasquirt is driven by the TACH_OUT on the MJLJ controller- so it doesn't matter if the MJLJ unit is TPS or MAP based.

Regards,

minty9277 · Post by **minty9277** » Sun Apr 29, 2007 9:33 pm

What would you do with the TPS wiring, would you run the TPS in of the Megajolt to the TPS in on the Megasquirt.

Thanks

Ian

Post by **brentp** » Sun Apr 29, 2007 9:59 pm

Using TPS to drive both would be possible in theory, it just depends on what you use as a "VREF" signal. Both the Megasquirt and Megajolt use a 5v Vref, so you could use either the VRef from the MJLJ or the VRef from the Megasquirt. Just make sure both units are grounded at the same location.

The TPS 'in' could be driven to both TPS inputs simultaneously.

In my case, I'm running the megasquirt in Speed-Density mode, and the TPS is used strictly for acceleration enrichment (equivalent to the accel pump in a carburetor). So note that I haven't tested this scenario.

Regards,

Autosport Labs

Turbocharged AW11 MR2

Turbocharged AW11 MR2

Interfacing megajolt and squirt