Late series engine compatibility with earlier series engines?

AND the Turbo's, Inter-coolers and associated pipe-work will scream "TWIN TURBO" and you will get an ass-ripping, as well as have your car de-registered(when it fails a pit inspection).

Sounds like a Plan!!!:W::banned:

 

Easiest way to do it would be to use your existing na cas, tps, add larger s2 injectors all fitted to an early tt engine.

The only thing you are loosing is the better head design of the later engine, but that is irrelevent because your na heads are no where near the flow figures of tt heads without massive of port work.

Build up an early TT engine to what you want, bolt on the electics from the later engine and your done. You will not need to change to the tt harness or ecu. You will need it tuned but that can be done with your existing ecu. Fuel pump can be changed out to a TT one.

 

Can't you read everything in a post old man?

 

Definitely springs, a few of us that race NAs have found the limit of NA springs in standard engines with bolt ons driven hard, they will not be close to holding up in a TT, much less a powerful one.

Better built engines don't always last longer, they are sometimes just a lot more fun whiler they are going which tends to lead to more abuse which brings the life-span right back down again. Especially if you race it.

 

But is all that directly interchangeable? Just unbolt, then bolt on again?

I don't think so, only because if it was, everyone would be upgrading to the later style of things when rebuilding/repairing...

Just don't want to start down a path, then realise I can't finish it after dropping "x" amount of dollars in.

Gladly be corrected however

 

Valid point!

What I meant was I want a quality engine that isn't made with bok-choy parts that I can be confident in.

 

Down side to this is that in Victoria it may not be registerable, the engine needs to be the same age or newer than the chassis. I think identical engines from different years (ie an 89 engine in a 91 chassis) may scrape through but once you get to the series 2 stuff you may be in trouble.

Definitely worth checking before you do anything.

 

What sort of proof do you have to show for engine age though? If you get a import engine or half cut it never would have been registered and they would not know the age.

As for the valve springs, I would be less worried in a TT than a NA. I wouldn't change them unless upgrading cams.

 

If you import it you may be fine, if it's from a car that has ever been registered in Australia you are in trouble though.


RB25 or 26/30 conversions in Skylines are technically not registerable here for that reason.

 

I have just done the whole NA-TT thing with vicroads, I don't think you will have a problem putting an early TT motor in, you just need to fill out the "change of vehicle details" form (on the website) and provide proof of purchase of the motor. As far as I remember there isn't even a box on the form to specify the age of the replacement engine but my car is a '90 model anyway so it wasn't really an issue for me.
It's also easier because there isn't any way to identify whether the engine is NA or TT from the engine number (they all start with VG30XXXXXXXXw or something like that, there is no DE or DETT in the engine numbers).

 

When did Nissan change to the OBD2? My TT is 12/97 & has the OBD1 port. And the $80 consult cable with software seems to run fine.

Dean, you might be surprised how cheaply you can bring a late model TT engine (or even front cut!) in from Japan. Might be worth a look before taking on some potential headaches.

 

Is it possibe to tell an engines age by the engine number with Nissan Fast ?. Are the road authority's just relying on the previous registered info to match engine ages or is it really not that hard to get away with?

 

I haven't seen a Jap Z32 with OBD2, it may be a US only thing.

 

Cheers mate, ill be giving vic roads a call before heading down whichever path I choose

Also, you wouldnt change valve springs unless you change cams? Why?
Is there any can I can put in the coming build that will reduce lag time in fairly large turbos? Or will cams just improve top end and either increase or leave lag?

 

Was wondering if that was the case since that OBD2 pic is from a LHD car.

 

The thing is, if I were doing a stock conversion, i'd consider it, but this will be a built motor, so the late model zed i'd be bringing in would be going through the same paces and will get dropped into my current zed anyway

 

Not much short of nitrous is going to make a big difference to your lag with big turbo's. If you have big turbo's you will have lag.

Larger cams generally increase power/torque at higher RPM's. The higher you rev the stronger your valve springs have to be to stop valve float/bounce. Also a lot of aftermarket turbo cams have quite an aggressive ramp rate, which is the duration between shut and open which can cause valve float. Any decent cam i.e. not a regrind will need stronger valve springs.

 

I'm not talking huge turbos, definatly not something that hasn't been done before.

So what does reduce lag? I've heard a good intercooler helps (already taken care of), what else?

 

VICROADS RULES
Change of engine
1. Replacement engine is identical to the original engine, or is an option allowed by the manufacturer for the same model vehicle
The optional engine must be offered in Australia by the vehicle manufacturer as an option for that vehicle (or certified variants). The change of engine may be recorded by VicRoads provided that the registered operator or a motor mechanic, or dealer in that make of vehicle or an Automotive Engineer signs a declaration certifying the engine is optional for the vehicle model, and that all modifications made by the manufacturer for the same vehicle model with that optional engine have been completed.

You will need to attend a VicRoads Customer Service Centre to have the vehicle's engine inspected to confirm the new engine details. No appointment is required. You will also need to complete a Change of Vehicle Description form.



from what i am reading nothing to do with the year of engine.

 

Yes, it is. The reason most don't do it is because they don't have a late z32 so quite a few other things need changing. Every part required to bolt an early engine in your car is already there on your na. And it is only a few electronic bits you need off the na anyway. Cas, Tps and injectors which you will be upgrading, will all fit straight on.

Also if your car is an import, they very rarely have the year of manufacture on the import plate or listed at all. They wouldn't know if it was an 89 or a 99. The only thing they know is when it was complied over here.