Real Fiero Tech

I pulled a datalog of a stock lz9 with the lnj stock cam, vs the 3.5 with the aftermarket cam. you can see the boost curves at the same rpm here. much less boost on the 3.5 clearly my turbo is oversized for the engine at lower rpm. the 3.5 needs more rpm to make up the difference which is to be expe...

Curious as to what the factory hub runout is? Maybe it's already been mentioned

Exhaust is looking good. Welds look good from here

Looking good on that bracket.

Here is the current state of the engine. Lnj cam in, ready for some reassembly.

It seems the camshaft is discontinued from gmparts direct.

I used the 2009 equinox lt trim which should be the 3.4

Welp. That's that I guess. No more available.

You asked why not keep the vvt. I show why, and you say "so".

Hey man, when you do your 3.9 on the stormtrooper you can spend hours tuning your vvt cam for an extra 400 of additional rpm.

J upson who knew his vvt cam was not dialed in correctly but dynod anyways just to show what can happen. This was a gtech style road Dyno. Drastic power drop.

It's gonna run a microsquirt amp. Vvt is being deleted for simplicity of swap I have yet to see anyone who kept vvt with an micro or megasquirt do a Dyno to see where their power peaks. However j upon did dynod his with his modified vvt and it wasn't dialed in correctly. I believe power fell off bef...

Are the block casting numbers different? It doesn't look like there's enough iron to move that bolt hole outboard 4mm The earlier blocks have the bolt pattern the same as the 2.8. there is no need to move the bolt hole out further Eric is saying the lz9 is out a bit further. But it's close enough w...

Got the intakes, valve covers and pushrods out. Still need to remove timing assembly and lifters, then the lnj cam can go in

Interesting idea on the mount. We could do a test fit and give feedback if you want and take some pics.

I've got the front torn off and prepping for the lgd cam swap.

The Dark Side of Will wrote: ↑Fri Nov 17, 2023 2:39 pm I thought the 3900 had the upper water manifold at the back. I guess I was wrong about that.

Are the water manifolds two separate pieces or one large cover as with the Gen II & III engines?

The water manifold is one piece but it's separate from the timing cover.

There is no upper bolt hole.

Mounted. Easy.

Gotta trim/grind the front mount like you do on the dohc 3.4 swaps. I also trimmed some excess webbing on the oil pan. A bit off the pan and a bit off the mount instead of it all off the mount. But that's it.

Engine is off the cradle I'm kind of interested in trying to see if using the factory front cover and water pump assembly will be too difficult or just swap over to the fiero stuff. Coolant hose routing and alternator packaging are the big concerns with using factory LZ components. I'll have to mock...

Make offers. Crossover, heads, exhaust manifold, engraved plenum, middle and lower with sensors.

That will prob peak close to 6800 if you have the intake manifold to support it.

It's gonna have some serious chop at idle