Thread: z7 kit

Can I install my z7 turbo kit without the gutted supercharger and intake? Can I just use the l36 upper plunum?

You could modify an L36 LIM by plugging the sparkplug holes....

Oops, true. Sorry. Shouldn't be typing while tired. Injector holes it is...

Originally Posted by Explicit_Spade

To use the L36 upper plenum, you need L36 heads, Lim and plenum.

You could probably pull your rotors out of the supercharger and take the belt off without hurting anything.

You can leave your blower on and run "twincharged" if you want to deal with a tuning nightmare.

Kind of a lot of misinformation in here.
You don't need L36 heads, as stated above.. you just plug the injector holes if you're swapping the manifold to L67/L32 heads. That's how I run my setup.
If you have an L36 already you're good to go... I'd plug the PCV and run dual breathers though.

As for tuning a twincharge setup... been there, done that. Easy as pie.
You shouldn't take advice from people who don't have first hand experience... like Explicit Spade. He seems to have armchair quarterbacked that whole post.

I'd try to have things custom made (it's a lot cheaper) or piece together the hot side pipes rather than just buying a Z7 kit.
Let us know how it goes!

Yes I have a 2003 grand prix gt. N/a buying a z7 kit from a friend for 1050 the entire kit only the turbo needs to he rebuilt. He's also giving me the gtp heads and the gutted supercharger and intake with fuel rails etc. Just wondering if I should leave my n/a setup and just block of the pcv. And what's a dual breather setup? Feeling stupid asking this question but.....and should I do anything with the internals? I'm told the n/a wrist pins are not strong enough to handle boost and that the n/a setup wont hold up to knock retard

Should I replace pistons, wrist pins, main bearings, and rod bearings? Should I leave my heads or put the s/c heads on it? Higher valve springs, roller rocker setup, injectors, valves???

Leave everything you have the way it is... you'll need bigger injectors and a fuel pump (depending on how much boost you plan to run), you'll need to block the PCV and run dual breathers, this means a valve cover breather on both banks... you need the valve cover from the front on the rear as well. If you don't do this you'll be boosting straight into the crankcase and you'll send oil out the dipstick tube all over your engine. I'd get some 105# valve springs, leave the timing chain stock if you're not swapping the cam. Run stock rockers.

From there you need to have a tune done by someone who knows turbo 3800s.
Whoever told you to build the bottom end doesn't know what they're talking about. If you're not going for a max effort setup there's no reason to even think about touching the bottom end.
I'm shooting for 700whp and I'm keeping the internals stock.
You will likely end up somewhere around 320-340whp on higher boost levels.

Glad you posted so I didn't have to snowboy. :P

I still have L67 heads and went with a L36 setup with a HVIII for my turbo setup.

1. Do not use 42lb injectors- these will get maxed fairly quickly, go straight to 60+ you will thank yourself later.
2. Just go with a gutted supercharger case-if I had to do it all over again I wouldn't have spent the money on the L36 setup plenty of power can be made with a gutted case. Plus it simplifies things.
3. Get a real tune not a shelf tune to bring it all together
4. Get a cam you will thank yourself later
5. Do not put down hellacious power if you haven't looked at trans upgrades/plan on upgrading

Do you "need" dual breathers? I only have the front now....