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z7 kit



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.
 
slimguns said:
You could modify an L36 LIM by plugging the sparkplug holes....
Click to expand...

And by spark plug holes I really think you mean injector holes. Most people use 1/4" brass NPT plugs do this.

Better question is what model of car are you slapping this turbo kit on....if it's already N/A then it's a bolt in ready to go, if SC then you'll have a few options to choose from. Most do L36/L26 setup and plug injector holes in the LIM.
 
im gunna guess his car is a 03 gt.. as that is his profile name.. hes been on the forum for 5 days so i dont imagine he just bought a gtp recently.. u never know
 


Explicit_Spade said:
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.
Click to expand...

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!
 
SnowFlake said:
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!
Click to expand...

 
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
 
stock03gt said:
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
Click to expand...

The gutted supercharger is only a thing because of people who have the supercharged top end and want to go turbo... so you remove the rotor pack from the blower and then you just have a fancy looking plenum. It's not something to be added on, it's just a way of dealing with it without having to switch over the whole top end of the motor.

Since you're not supercharged to begin with, you dont even have to worry about it. The z7 kit should bolt right up to your existing setup without you having to worry about the plenum, LIM or any of that other stuff.
 
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
 
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