TwinTurbo.NET: Nissan 300ZX forum - sure! any shop can do it!! EASY>>>
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Subject sure! any shop can do it!! EASY>>>
     
Posted by felixx23 on February 01, 2002 at 4:12 PM
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In Reply To Engine conversion 1990 NA to TWIN TURBO posted by cozmo920 on February 01, 2002 at 04:07 PM
     
Message lol joking!
there's awrite up in FAQ (to your left with the info)
or just read below....

Can I upgrade my NA to a TT?

Yes, it can be done in a billion different ways. From just trading the radiator cap from the NA to a TT (part numbers are
the same - 21430-54P00) to the real deal of getting a VG30DETT and replacing all the 'NA' parts with 'TT' parts. There
are numerous items in between to step up the output of the NA... most of which just qualify as performance upgrades
(super chargers etc).

In general the full blown conversion is not going to be worth the time or money. But hey, we drive 300s and do goofy
stuff to them all the time that would seem to be a waste of time, money or both. To each their own. Sell the NA and buy a
TT. I know a lot of people that have taken this route and honestly, I only can think of 4 reasons not to do it that way..
Let's consider 'Why' before 'How'.

1. 2+2 TT in the US. Steve Simmons is doing this very thing. Full blown VG30DETT swap into a 2+2. Still marginally
easier to import one then just build it, but during the build you can install all the aftermarket stuff. We will have a full
writeup at the end on [ www.TTZD.com ] in detail, unfortunately Steve is as busy if not more then I am, so progress has
been slow.

2. Convertible TT. Straman Conversions made TTs into convertibles. I'd probably take the opposite approach and turn
the NA convertible into a TT.. for the same reasons above. Aftermarket stuff is really nice to install along the way. Same
basic end result.

3. Slicktop TT. The Nissan race cars were slicktops. I really don't have an opinion on the slicktop.. it's sleeker and
weighs a little less.. but I love being able to remove the lid when the weather's nice.

4. The NA you have now is so trick (wheels, kit, paint, super clean condition), getting a TT to replace it just isn't going
to happen... the conversion might be a logical way to make it 'go' without loosing the money you've already spent on the
'show' portion of the car. As time goes on, more and more will find it necessary to take this route because clean TTs are
getting more and more scarce.

There are some people who have done a lesser version of a TT. Just bought turbos, manifolds and intake tracting, etc.
and installed it. Running stock TT injectors (370cc) and 4-5psi on the stock NA compression. Which made it pretty zippy
so I'm told. If you're going to go that far, you might as well take the bottom of the engine and lower the compression by
replacing the pistons. This allows the boost levels to be raised to TT levels. The only real difference in the internals is the
extra lubrication equipment on the TT block (oil 'squirters' for the bottoms of the pistons). The basics to do a full parts
conversion are these TT parts: ECU, Engine wiring harness, pistons, turbos and wastegates, injectors, clutch, flywheel,
clutch pedal assembly (booster etc), I think the NA tranny will work in the T configuration, Tom B knows more about it
then I, exhaust manifolds, precats (downpipes), main exhaust section (main cats), all intake tracting from the big rubber
'T' behind the mass airflow sensor (including intercoolers), some modification to the front facia to allow air to get into the
intercoolers, some modification to the shielding behind the intercoolers to allow air to leave the intercoolers, a boost
controller (I wouldn't run boost jets if I were doing this), an oil cooler and it's assembly, and finally, an aftermarket
boost gauge and A-pillar mount. Personally, I'd go with the VG30DETT instead of opening up the VG30DE and
replacing parts.

Doing the full on VG30DETT (block and turbos) install would be slightly simpler. Just pull the NA engine, intake tract,
exhaust to the H/X/presilencer, ECU and wiring harness. Install all of the TT parts listed above, except there's no reason
to do the pistons, since those are included in the VG30DETT engine with the TT engine and the lubrication gear is in there
for the squirters and the oil cooler attachements.

What it boils down to is time and money. I tell people it's probably going to be a better deal to sell the NA and buy the TT
in the long run (at least right now, re-read point 4). But then again.. making the full switch allows for some aftermarket
replacments to take place. If you're going to go full blown then maybe it's worth the time and effort to make the
conversion instead of buying a TT. Depends on the person, how much time they want to expend and how thick the wallet
is. Bravo to those of you (I'm included to some extent) who are doing the conversions in whatever fashion you decided is
the best way to get from point A to point B and to those of you who are doing the homework to make your own
conversion happen.

BTW, congrats to the guy with the super charged NA. It's pretty trick.. just wish you didn't have to loose the AC in the
process. Once he does the intercooler and larger injectors it will be pretty powerful I bet. Something else to consider in
the scheme of making the NA quicker.

If you're convinced doing the conversion is what suits you best, post on the forum with *specific* questions after using [
Search ] for most of the info. This question gets asked about once every other day. You'll get a better response then just
asking the classic "Can I convert my NA to a TT?" and hearing the collective groan from the other members.

Dallas DamonZ

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