[Mk2] [Turbo] 3SGTE Test Pilot Required

[JMR_AW11]

I've now got a few dataloggers out on test but this is the biggie for the 3SGTE.

I've designed and built a reflashable ROM board for the 3SGTE ECU and I need a local MR2 owner to test it with a quick drive up the road.

It's been fitted to a rev1 ECU and I've been able to test the ECU on a jig that simulates a real MR2 and it seems to drive just like a stock ECU.

It has the factory datalogger system built in and can be reflashed via a laptop for new maps or even a new ROM program.

It's a bit like a Techtom board only it has datalogging and it can be reflashed via a serial cable (no chips to swap)

Is there anyone (brave) near Cheltenham willing to try it?

I'm pretty sure it will drive just like stock as I can monitor it on the jig and it datalogs the fuel and ignition just like stock. Also the knock sensor and fuel cuts and boost cut all work as stock.

Assuming it works it means an end to speed limiters, fuel cuts and boost limits etc. Also full access to all the maps in the ECU and stuff like the TVIS and rev limiter.

If no one is brave enough I'll fit it to a UK NA mk2 MR2 ECU and ask again. It should fit all Toyota ECUs with the same MCU chip as the mk2 MR2.

I've also got a reprog board fitted to a JDM mk1 MR2 SC ECU if anyone local wants to test it...

[EarL]

Can't believe there's nobody wants to test this...

If I had a stock ECU, I'd be there like a shot!

Come on! Somebody help out. This has taken a long time and a great deal of effort to develop, and will make things so much easier for you guys to tune your cars.

EarL.

[TheRoadWarrior]

WOW good work that man! So basically you're saying you've adapted the stock ecu so we can easily access the actual maps in the ecu?? In other words you've tuned the stock ecu into a PFC+datalogit

Hehe, fantastic

[MaXsteri]

Can't believe there's nobody wants to test this...

I'm sure they do, just the requirement for a rev1 and local. I know I would be interested if I lived anywhere close

[screech205]

Damn, why can't you be a bit closer, i'd test it with pleasure

[JMR_AW11]

I've got a couple of rev2 3SGTE ECUs and I'm going to try the board in one of those next weekend so that might make it easier to find a tester.

Also I've got a Supra ECU it will work in. It should work in the camry V6 ECU (got one of those too) with a height adaptor.

[Rory]

Sounds good. I cant test for you as I have a butchered rev2 loom running a Rev 3 apexi pfc. Where are you located?

[andygt]

ill have ago just rebuilt me engine 3sgte rev1
always been a bit crazy just a shame im so far away down in southampton
would glady do it oh and if i could get the first one at discount ill drive to you
ill bring tea and biscuits if i can have it for free if all goes well

[simmo490]

i dont mind, just down the road but have a rev 2?

simmo

[zak_godsell]

i live in cheltenham and have a rev 3 but it is overboosting at the moment and has a unichip.if you could fix this i would try it out

[JMR_AW11]

i dont mind, just down the road but have a rev 2?

simmo

OK, it's not fitted to a rev2 ECU but I hope to try it this week in a rev2 ECU.

If I get no rev1 takers then I guess I'll have to do it for the rev2. The rev2 has a slightly more powerful MCU chip but I think I've got that covered.

A rev1 owner would be top choice as I've spent a fair bit of time testing it in a rev1 ECU.

It won't fit a rev3 as that ECU uses two MCU chips instead of one.

[JMR_AW11]

ill have ago just rebuilt me engine 3sgte rev1
always been a bit crazy just a shame im so far away down in southampton
would glady do it oh and if i could get the first one at discount ill drive to you
ill bring tea and biscuits if i can have it for free if all goes well

I'm hoping to find someone quite local to test it first time in case it takes a couple of tries. I'm pretty sure it will run fine first go but then it never pays to be too overconfident!

[JMR_AW11]

BTW what are the usual mods for these ECUs?

I can remove or alter the fuel cut mapping and also the speed limiter and there is a map that affects the TPC VSV (boost limiter?)

Also there are safe maps (used after ECU reset in learning mode or if there is too much knock)

Also the fuel mapping seems to go crazy rich at the higher boost levels.

[ast]

I think that if this board could provide the following, and a reasonably easy way of changing those, it would be enough for most cases where you would like to use stock ECU. Typically small bolt-on modifications and CT26 or CT20b at 1-1.2 bar.

- fuel cut adjustment (not neccessary but nice to avoid extra hardware)
- speed limiter bypass (same here)
- fuel maps (this is the main need)
- bigger injector support (through fuel map change?)
- ignition maps (this is the secondary need)
- some basic datalogging, injector duty cycle and knock level mostly

With rev1/2 you need some extra HW for boost control but if it would be possible to tweak the ecu program to control proper boost control solenoid with PWM you would get rid of separate boost controller. I think even open loop control would be better than nothing but as there's the MAP-sensor for fuel-cut and boost meter closed-loop would be perfect!

I'm very interested in this because I have reasons to keep my car looking as stock as possible but still would like to get around 300 bhp.

[JMR_AW11]

I think that if this board could provide the following, and a reasonably easy way of changing those, it would be enough for most cases where you would like to use stock ECU. Typically small bolt-on modifications and CT26 or CT20b at 1-1.2 bar.

- fuel cut adjustment (not neccessary but nice to avoid extra hardware)
- speed limiter bypass (same here)
- fuel maps (this is the main need)
- bigger injector support (through fuel map change?)
- ignition maps (this is the secondary need)
- some basic datalogging, injector duty cycle and knock level mostly

With rev1/2 you need some extra HW for boost control but if it would be possible to tweak the ecu program to control proper boost control solenoid with PWM you would get rid of separate boost controller. I think even open loop control would be better than nothing but as there's the MAP-sensor for fuel-cut and boost meter closed-loop would be perfect!

I'm very interested in this because I have reasons to keep my car looking as stock as possible but still would like to get around 300 bhp.

Hi ast thanks for your post!

I really just do electronics and i know very little about turbo engines.

I can do all of the things in your post except i don't really understand about boost controllers.

The stock ECU is limited to 16kb of code/maps for the rev2 but my system doubles the memory to 32kb with another 8kb section (and another one at 16kb) for the maps so codespace is not a problem.

So I could add stuff to the factory code to do with boost control or simply modify the maps that are already in the ECU.

I've only been looking at this ECU closely for a few weeks but I have reverse engineered most of the code so I know where the maps are, and also how the knock code works and also a fair bit about the closed loop fuelling.

Also I take advantage of the hidden factory databus inside the ECU to grant me low level access to the inner workings of the ECU MCU chip. This allows datalogging of 'everything' eg sensors and rpm and efi and ign timing right down to logging the internal timers that add a delay trigger to things like the speed limiter or TVIS etc. Or I can look at the logic levels on the chips pins via the datalogging or I can even watch the MCU stack or internal 16bit timer in real time. It is possible to datalog the knock self learning and see how much fuel and ign retard is being added during knock. Also the closed loop fuel learning and the 02 sensor status.

The way I've arranged the hardware means the code can be upgraded at anytime in the future. The 32kb is a total blank canvas so the whole ECU code coud be changed with a simple laptop upload.

I think I need to learn more about boost and boost controllers...

BTW the ECU will not look standard with this board fitted. I have to raise the lid height with a spacer. I could make a more tailored/discreet board but it would not be as universal as this one.

[TheRoadWarrior]

It is possible to datalog the knock self learning and see how much fuel and ign retard is being added during knock. Also the closed loop fuel learning and the 02 sensor status.

That would be really handy

[screech205]

Think you'd be on to an absolute winner if you could get the ECU to run closed loop up to 16psi instead of using the ECU maps as overfuelling at this sort of boost pressure is a common problem on Rev1/2.

I'd certainly take one if this could be possible as it would be a viable alternative to the Unichip, etc

Steve

[JMR_AW11]

Think you'd be on to an absolute winner if you could get the ECU to run closed loop up to 16psi instead of using the ECU maps as overfuelling at this sort of boost pressure is a common problem on Rev1/2.

I'd certainly take one if this could be possible as it would be a viable alternative to the Unichip, etc

Steve

It won't run closed loop fuelling at anything like high boost.

But it is possible to simply tweak the 3D fuel correction maps at high rpm and boost when open loop.

These maps would be accessible via a GUI

eg here's the main fuel correction map in a JDM rev2. each curve is for increasing boost and you can see how much control you have. Much better than a Unichip. You could soon remove overfuelling with this map.

Each dot is a map value in a table and you can move each dot up and down with the GUI. EG you could have crazy zig zag rollercoaster fuelling if you wanted

[screech205]

Fantastic, have you any idea yet on what one of these would cost to sell and who would be able to map them?

Would certainly save a lot of installation costs as it would be plug and play

Steve

[rossdymond3352]

damn thats good work mate, please put these into production!!! i dont want biggy performance i just want adjustability and flexability at a decent price :D:D

Ross