Mx5 factory security

[BPTravis]

Hi guys,

Do the mx5's have any sort of factory security gear from 89-99?

Like the ford smart lock, or anything like that?

Kill switches, engine cuts, security keys etc.

[sailaholic]

I think the later ones had a factory immobiliser as I remember the us guys saying that if you swapped a late model engine into an early chassis then You needed to make sure you got the immobiliser unit and keys that matched.

Having said that I know the standalone ecu can work with or without the immobiliser. I believe it's a completely separate unit that has an input to the ecu that says "key recognised ok to start" which I would assume is just supplying to correct voltage signal.

Nb owners might be able to help more.


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[BPTravis]

Cheers mate.

So I don't need to worry as I'm only chasing pre '99 models.. That's if u meant later as in NC? I think r the post 2000 or 2001 mx5's

[sailaholic]

Unfortunately No, i was meaning NB. But for memory (it's been a couple of years now) i was looking at NBB engines (so variable cam timing), rather then the NBA engine i think your looking at (vairable inlet volume or VICS).

Are you planning on using a factory ECU? if not, then there should be no issues.

[BPTravis]

Id prefer whatever one had the 9.5:1 compression ratio, which I think is the 97-99?
But at the end of the day, I'm going to buy whatever one comes up at the right price at the right time (as long as pre '99.

The plan was to get it running on the factory ecu, just to make sure everything is sweet...
then change it to a turbo ecu later.

Just want to make sure I'm not going to get stuck on something like security :-/

[sailaholic]

OK well the NA8 BP (93 - 97) had no factory security, but that is the one with the 9:1 and HLAs but did have the feeds for the oil feed in the block for a turbo.

Can't give you specifics on the later engine re security. It's worth nothing that the Heads from the two are swappable, however i think the compression was in the pistons. While the heads are swappable the Inlet manifold is not, the port alignment is different compared to the studs. There are adaptor plates kicking around. Exhuast ports are the same.

The later engine also ran a cam and crank angle sensor seperately (which i assume you know), while the early engine ran a combined cam/crank sensor attached to the back of the exhuast cam.

[BPTravis]

Hhmmmm, I'm going to be using a 323 familia gtx bpt ecu and loom after I go turbo.
I may be limited to the 93-97 with the combined sensors?

Don't mind either way, it's just preference really,

Ask for m&m's get smarties.. All good haha

Solid lifters was the other thing I wanted which is on the 9.5:1 ratio motor too.

[sailaholic]

For memory the nba cam still had the groove in it for the combined sensor so it may just be a case of swapping the cam cover and fitting it.

If not then your next option would be swapping the early head on a 9.5 block.

Then the early engine complete.

It might be worth nothing that a lot of the engine builders don't rate the mazda solid lifter as worth a lot of effort to swap to as the HLA hold up pretty well and the factory solid lifter are sim on bucket rather the under with I think a reduced face width?

Mazdaspeed make shim under bucket conversions for either engine or atleast one builder just coverts the HLA to solids somehow.

The later head does also flow better but that might not be that much of a help depending wether you plan to tune the bpt ecu or not?


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[Jeo]

Factory Security

[project.r.racing]

if you are gonna use a 90-94 ecu from a gtx. then it doesn't matter what ecu you get. cos the cutting of the loom to make the gtx dinosaur ecu work will negate any issues.

[BPTravis]

Thanks guys!

I'm really looking for the easiest option as it's going In a 600kg shell, it's going to be quick no matter the BP I use.

So the 93-97 original BP is my best bet?

[project.r.racing]

the easiest option you be to use a mx5 loom and a plug and play aftermarket ecu. 2 reasons:- 1) it's plug and play and companies have products and maps for non turbo to turbo conversions. and 2) mowwwrrrr powaaahhh!

yeah it'll cost more, but it'll be the easiest transistion from non turbo to turbo you've ever done electrical wise.

[BPTravis]

Cheers man^!

I've done a microtech myself, anything is easier than that lol

Unfortunately, I do actually want bpt ecu :-/

So 93-97 will be easier to mate up BG bpt.