Chris' 72 Project

Post by **510rob** » 12 Apr 2006 09:37

Derek went with a 300ZX throttle that was a bit smaller than the 240SX unit... I think either one would work equally well and both are quite plentiful. We pulled a couple throttles from 240SX 12-valve motors at the wrecker. If you don't want to pay "sports car" part prices at the wrecker, pull one off a Mercury Villager minivan or Nissan Axxes minivan (then it's "minivan" part prices!)

heirfaus · Post by **heirfaus** » 19 Apr 2006 22:55

I forgot to post a pic and I don't think I mentioned it, or maybe I did. I have a L28 throttle body with tps and olschool linkage. Is that the same diameter as the 240sk unit?

I finnally bought the megasquirt kit yesterday. Now I just have to build it, and get the last odds and ends, but who knows how long that will take......

I almost got distracted, and started a rear disk brake conv. but I barely decided to stay focused on the EFI.

About 400 US for rear disk conversion complete and I don't have to fabricate anything!!

Oh well that will have to wait.

Post by **rnorrish** » 19 Apr 2006 23:18

heirfaus wrote:I forgot to post a pic and I don't think I mentioned it, or maybe I did. I have a L28 throttle body with tps and olschool linkage. Is that the same diameter as the 240sk unit?

I think someone who has one should go measure and let us know!

Post by **510rob** » 20 Apr 2006 00:49

Chris,
I have a feeling that the L28 throttle position sensor will NOT work with megasquirt (or any other programmable EFI setup - for some reason I think it's a switch box, not a ratiometric potentiometer)

measure it with an ohmmeter and make sure it's compatible with the EFI stuff before you fabricate a bunch more shit around it...

By the way, which MegaSquirt did you go with?

Post by **Byron510** » 20 Apr 2006 07:11

The 280ZX/200SX is just a switch box, one for idle, one for full throttle, and one for anywhere in the middle. That's all the L jetronic system needed. I know this for sure, as I took one apart 11 years ago when I started my own EFI project.
Byron

heirfaus · Post by **heirfaus** » 20 Apr 2006 20:07

Thanks for the tip.....and it's funny that I fix cars but don't think to measure my own throttle body before asking!!!!!!!!!!!!!!

heirfaus · Post by **heirfaus** » 20 Apr 2006 20:10

Oh and I bought the basic version 2.2, I figure it will work for now. It's funny I'm on a tight budget until august when I get married. I figure I would save some coin and get the less expensive, now and then go big later this year.

Derek · Post by **Derek** » 25 Apr 2006 07:33

As I mentioned in the SR thread, I'm putting EFI on a built L18 -- 10.5:1 compression via ZX flat tops and a closed chambered worked over A87 and DAMB cam. I got the V3 board as they made some improvements in the layout and made it more physically reliable when compared to the V2.

datsunfreak · Post by **datsunfreak** » 27 Apr 2006 05:27

heirfaus wrote:I forgot to post a pic and I don't think I mentioned it, or maybe I did. I have a L28 throttle body with tps and olschool linkage. Is that the same diameter as the 240sk unit?

IIRC, the L28E TB is a 48mm unit. Honestly, it's too small for what you are doing. The 300ZX TB is a 55mm (good, but on the conservative side), and the 240SX is a 60mm (good, but on the big side).

Personally, I would go with the 300ZX. I've used a few on 4 cylinders and they seem to work nice, without any noticeable tip-in.

FWIW, you can swap the later 300ZX potentiometer TPS onto the early 280ZX TB. Just takes a bit of slotting of the holes I believe. I did it once, but it's been about 6 years ago...

heirfaus · Post by **heirfaus** » 28 Apr 2006 19:43

Rob I ordered the flyback board last weekend and got it today. Got all my supplies and I should have them both built tonight.....hopefully, if everything goes ok. I also ordered the MSD inline fuel pump a few days ago.

My roomate is supposedly a circuit board building pro, so we'll see!!

Post by **510rob** » 28 Apr 2006 20:09

good choice on the flyback option; it will make the wiring harness more compact and easier to wire up...

Here's how we built our units...

Post by **510rob** » 28 Apr 2006 20:13

to cut the board down, just put some tape over your vise jaws, and use them as a nice guide for a hacksaw. After the cut, gently file it smooth with a file.

Post by **510rob** » 28 Apr 2006 20:18

if you do all of this, you can slide the flyback board into the bottom slot in the lower case, and drill+tap the bottom case to hold the transistors without nuts on the outside!

heirfaus · Post by **heirfaus** » 29 Apr 2006 23:14

Ok so the only tought thing about this is finding the time. I only got in 20 min yesterday, and about 20 min today. So I guess it'll take a little longer than I thought, but don't work for the next 2 days, so should be done soon

I love the setup for putting the flyback in, but I doubt myine will be that pretty, oh well we'll see

Post by **510rob** » 30 Apr 2006 01:03

is that some 9V battery testing you are doing in the picture?