I want to know if it's possible to run the modified ECU (from JWT) for a BlueBird sr20det set-up(stock) on a stock sr20de??

I don't think that'd be a very good idea, but it may be possible. The first thing I'd worry about is the fact that the BB DET's injectors are larger than a standard DE, so you'd be running lean all the time. Secondly, the ignition curves are probably a little off, assuming that you did get enough fuel to safely set a spark. Third, I'm a monkey, so you shouldn't take my word for any of this.

You can run the turbo ECU, as long as it is programmed for the MAF and Injectors you have in your car.

why not!i mean, i use the same TPS and the MAF will send the right information about inlet pressure, sure it should not run perfectly, but....; ?

What would be the negatives of running my JWT ecu programmed for turbo, 50lb injectors, 3-bar, Cobra MAF, & S4 cams on my motor with all those things minus the turbo?

The negatives are a less than optimal tune for NA power, but it is a very good idea to install your MAF, injectors, regulator, and fuel pump ahead of time, and drive with them to test them out before you install the turbo hardware. It will reduce the amount of work you have to do all at once too! Go for it.

Originally posted by domiguy
What would be the negatives of running my JWT ecu programmed for turbo, 50lb injectors, 3-bar, Cobra MAF, & S4 cams on my motor with all those things minus the turbo?

what lyn said. It'll run a little rich, but just crank your timing up a bit, say 19.

andris

Well I know I will definately do this to make sure the injectors work fine and stuff, but would it be fine to run around like this for like a month? or more?

Originally posted by domiguy
Well I know I will definately do this to make sure the injectors work fine and stuff, but would it be fine to run around like this for like a month? or more?

Yes, Like he said!

It would be best to run around on the new injectors/maf/fuel whatever w/o the turbo so you know the tuning system is working correctly.
Your car will be a bit slower w/o turbo and with the turbo maps on the ecu, but nothing that will hinder daily driving.

Go for it, it is a good idea, makes for a slower more calm install to have it done over a period of time. Ie.. drill and tap and tune up one week, next week install fuel system and new ecu program, drive around for a while, install the turbo parts and enjoy!

david lau

That is exactly the path I'm taking !

At some point I might be driving around with a front mount with a bunch of pipes sticking from it connected to nothing inside the engine bay.

I don't know how to technically state this, so here goes.
First of all, you would be doubling the amount of fuel you engine sees.
Second, wouldn't the MAF freak out because the ECU needs to see a certain voltage dependent on the MAF readings provided by the boost and/or vacuum of the turbo?
Third, wouldn't you need a much hotter spark to light 100% more fuel you're giving the engine?

I may be wrong here, but these issues jump out in my mind. If it can be done, cool. I just don't see how it would run good enough to drive. I see it idling like crap and running worse. Please feel free to correct me if I'm wrong.

Robzilla

Originally posted by Big Boost
I don't know how to technically state this, so here goes.
First of all, you would be doubling the amount of fuel you engine sees.
Second, wouldn't the MAF freak out because the ECU needs to see a certain voltage dependent on the MAF readings provided by the boost and/or vacuum of the turbo?
Third, wouldn't you need a much hotter spark to light 100% more fuel you're giving the engine?

I may be wrong here, but these issues jump out in my mind. If it can be done, cool. I just don't see how it would run good enough to drive. I see it idling like crap and running worse. Please feel free to correct me if I'm wrong.

Robzilla

Just because the ecu is programmed for turbo does not mean it has to have a turbo to run. The new fuel and timing maps may be a bit rich for a NA motor, which is fine, it will run a bit rich, but not "100% more fuel"...

Adding bigger injectors and a bigger maf does NOT mean you automatically dump more fuel into the engine and you automatically need a turbo to push more air so the MAF reads right.

Bigger injectors and bigger maf mean that if you now want to put more air into the engine than the stock maf could register, you can, because the new maf will read the extra air. The new maf, though, operates just like the stock maf, just with different parameters. It still reads NA air levels fine.

Bigger injectors don't dump more fuel in automatically. Bigger injectors have the ability to flow more fuel than the stock injectors, providing you have them matched to the right ecu. Bigger injectors just allow more room for power by being able to flow more fuel, they still flow the same amount of fuel at idle and at NA powers (unless they are really friggin big and then they will dump more fuel in at idle because they are made to flow so much they cannot regulate their flow enough simply because of the size of the holes in the injector.. kinda like a 1/2 hose compared to a 1 inch hose.. get that?)

that all make sense?
A turbo motor is a NA motor with the ability to flow more air. The air pump(turbo) pushes air into the engine. The same injectors/maf can be used on a turbo or NA car *within reason* being that certain injectors/mafs limit the amount of air you can flow.

david lau

Thank you David, for the explanation.

BTW: I still have your drill and tap, I apoligize for holding it for this long ! This weekend looks like I will drilling my hole, (we did Mark's last weekend.) Thanks again, and I will send it back soon.

But can you run a stock sr20de JWT ecu on a se-r with a bluebird setup?

Yes, assuming it has been programmed with the turbo program on it.

Can I take it over there and use the JWT sr20de ecu and have them reprogram it for the turbo application, if so how much would that cost?