ib042129

Don't I also need a MAP sensor? At the least?

mikeatrpi

Hey, good luck with your swap. I was in the same place as you and decided to go with megasquirt. It turned out pretty good, but it was a pretty steep learning curve to get a decent tune.

Here's my build thread for reference. It doesn't get interesting until page 2 or 3. There may be some info in here that you can use.
http://forums.hybridz.org/index.php/...s-and-answers/

ib042129

Nice build. I love it.
I am not opposed to using MegaSquirt, but I would like to save it for later. I want it running the cheap way first.
Like I said, comprable to the cost of a motor swap. I could be wrong, but as soon as I look at upgraded electronics, the price shoots way up.

Question:
What kind of thread size it the stock turbo oil supply line? At first I read that is it 1/8 NPT. Tried that, and it's not the case. Now, I read that it is 1/8BSPT.
I will order the fitting for that from McMaster, but I am skeptical.

The oil line does not have a conical thread, but it has a flared end instead. Is it some different standard?

WildmaN

I still plan on doing the Z31 ECU upgrade for my turbo conversion. Considering there is a great write up on it. And it really would not cost as much as going Megasquirt. Just my 2 cents man.

mikeatrpi

Yeah, adding MS definitely increases the cost. The kit itself is relatively inexpensive... but then you add in the sensors, wire, relays, injector connectors, fuse blocks, etc...

BSPT is very similar to NPT, which is why some people make it work. You can run a tap into the block with some grease on it to make it NPT. I chose not to. I ordered my fittings from BAT, Inc.

http://www.batinc.net/mocal-central.htm

NismoPick

The Z31T upgrade is great for someone w/ a complete 280zxt or at least a complete L28ET w/ ecu and harness. That is because everything is plug and play. ib042129 is building a turbo motor out of an n/a motor, so it wouldn't be worth it for him, but in any case, he needs to upgrade his fuel computer someway... he'll find out when the car doesn't run on 20psi (or 90psi) of fuel pressure.

ib042129

Yeah. The connection to the block is not an issue. But I am skeptical about the stock turbo fitting. I don't think it is BSPT. It is some sort of flared pipe standard. (I think you just ran a whole new oil line, so you did not have to deal with the fitting.)

If wrost comes to worst, is it a problem if I cut the stock metal oil line and just but a fuel/oil hose over it and clamp it? I would rather not do it that way though.

I really hope you are wrong. Well, you are exaggerating the pressures of course. I should not need to go up to 90psi. And I think the base pressure should be more like 25psi which may or may not pose a problem.

mikeatrpi

On the turbo end, mine had some kind of bracket and a banjo bolt. I don't recall the threads on that. The other end of the metal line I recall being flared, but like you noted, I replaced the metal line with a flexible one. Sorry I can't help you there.

FricFrac

Yes you'll need a different MAP sensor once you're running over 36lbs of boost. Untill you're running at that level the 2.5bar MAP sensor that's built onto the board should work fine

FricFrac

The problem is that you're barely upgrading and cars running on the Z31 often times have stutters, etc. With MS you've got the ability to trouble shoot and look at the data either real time or recorded whereas the Z31 is a black box and you'll end up chasing your tail and/or replacing parts until you've fixed the problem. There are 8 and 16bit version of the ECU and with the variations on harnesses, sensors and ECU's there is plenty of opportunity for issues. Personally I'd rather not spend the money twice or all the grief of trouble shooting and I work with electronics for a living.....

FricFrac

That's not quite correct. I'm actually building an adapter and plugging right into the stock harness and using all the stock sensors including the air temp sensor built into the stock AFM. The only thing I need to run is a vaccum line to the MS (have to run a line for the boost gauge anyhow).

ib042129

Hm. That's interesting. Do you have a writeup of what you are doing?

mikeatrpi

Why do you need the AFM if you're running Megasquirt?

One additional sensor, which I suppose is optional though highly recommended, is a wideband O2. Those can be costly but its hard to tune without it.

NismoPick

^^^ If I read FricFrac's statement correctly, he didn't say he's using an AFM, he said he's using the air intake temp sensor in the AFM (the lil plastic node just inside the lip of the AFM).

mikeatrpi

Ahh, I'm not very good at reading. If that's the case, then yeah, I'd be interested as well to hear more about it!

ib042129

Okay. That brings up a question. Where is his AFM located? Is it AFTER the intercooler? Because for my setup it has to be BEFORE the turbo and the air temperature would be much different after the turbo.

Also, why did mike get a different TPS sensor? The stock one is not adequate?

FricFrac

I'm using the stock setup so the AFM will be located where the stock AFM on the 280ZXT is located. I did forget about two things - one of which you mentioned is the wide band O2 sensor. Once the system is tuned, however, you should be able to run on the stock narrow band O2. The other thing that is required is to replace the stock TPS (switch) with a variable resistor type like the ones found on the 240SX, etc and run the wiring for it back to the MS. The stock wiring harness only has two wires running to the sensor so you could use a single addition wire in conjunction with the stock harness or even use a good ground on one side of the TPS and the other two stock wires back to the MS

ib042129

So a little bit of an update. No photos, sorry.
I finished the intercooler routing. It did not come out to bad. I guess it will be useful to list all the pipes and fittings that I used for future reference. I will make sure to compile a list soon.

The oil supply line does use some weird thread standard, the BSPT fitting does not fit on the oil supply lie. So I will just cut the line a bit and use a flexible pipe and a barb fitting to the engine.

I also got my BEGi fmu in the mail, but as usual with buying things used from forums it was missing a needle valve that does the boost dependent adjustment. $20 +shipping later, and the needle valve is in the mail. I will see how it works out for me.

FricFrac

Pictures of the intercooler setup please

snwbrderphat540

anybody else think he is gonna have issues with how his AFM is laying?

and hey jeff, ever build a megasquirt ECU? if you're still reading this thread

ib042129

What exactly do you think those issues will be?

I know that routing the air filter will be a bit of a pain. And also, the way things are now, I need to relocate the ignition coil.


I will get the intercooler pics on Sunday.
I still need an exhaust pipe from Borini, which I hope is in the mail.
And the needle valve for the BEGi FMU. So I won't start the car on Sunday.
But hopefully some time during the week I will see if it runs at all.

JSM

Smart!

ib042129

Here are the pictures of the intercooler piping.
Please don't get on my case about the mismatched color on one pipe and coupler.

I routed the vent of the BOV into the bung that is right after the AFM but before the turbo. I also routed the vent from the head cover there.
And the cold start line went into the bung in the J-pipe.

After the photos is a list of all the pipes and the fittings that I used.

http://www.flickr.com/photos/11194201@N03/5875477472/http://www.flickr.com/photos/11194201@N03/5875477472/ by http://www.flickr.com/people/11194201@N03/, on Flickr

http://www.flickr.com/photos/11194201@N03/5875474380/http://www.flickr.com/photos/11194201@N03/5875474380/ by http://www.flickr.com/people/11194201@N03/, on Flickr

http://www.flickr.com/photos/11194201@N03/5875471640/http://www.flickr.com/photos/11194201@N03/5875471640/ by http://www.flickr.com/people/11194201@N03/, on Flickr

http://www.flickr.com/photos/11194201@N03/5875468908/http://www.flickr.com/photos/11194201@N03/5875468908/ by http://www.flickr.com/people/11194201@N03/, on Flickr

http://www.flickr.com/photos/11194201@N03/5874905209/http://www.flickr.com/photos/11194201@N03/5874905209/ by http://www.flickr.com/people/11194201@N03/, on Flickr




Turbo-AFM:
2.5 inch Si coupler *2
2.5 inch 45 degree Al pipe
2.5 inch T-clamps *3
Stock pipe that goes from AFM to intake
Big clamp for AFM

Intercooler Piping:
2.0 inch Si coupler
Stock Turbo outlet clamp with heat shield, or 2.0 inch t-clamp *2
Stock J-Pipe, cut to be as long as possible.
2.0-2.5 45 (or 90) degree silicone coupler
2.0 inch T-clamp

2.5 inch 45 degree AL pipe
2.5 inch 90 degree AL pipe *3
2.5 inch 90 degree Si coupler *3
2.5 inch straight AL pipe
2.5 inch straight AL pipe with bung for BOV
2.5 inch straight Si coupler *3
2.25-2.5 straight Si coupler

2.5 inch T-clamp * 13
2.25 inch T-clamp

JSM

Nope on MS. I have an Electromotive system that I will eventually will be installing.

Right now i'm workign on a 300zx Turbo swap with a 300zx Wiring harness as well. I've not seen anyone use a 300zx turbo harness yet. I've spent tons of time reading the wiring harness diagram and spending some time over at Z31performance.

JSM

It works, just more points of failures. After testing it a bit, try and find someone who can weld you up some pipes to elimante some of those couplings.

Curious to what the red tubing is? Silicone? Where did you get that form?