I don't really post a whole lot in forums, but I have started a project that I sort of want to give a little instruction on as I do it. I have an '88 K2500 with a rather sloppy LQ4 swap in it. Recently, Richard Holdner posted a video of him supercharging a 4.8 with an STS-V M122 blower. Well turns out just before that vid the blowers cost like $450. I was able to snag one before the price got too out of hand. Impulse buy like no other , but there it is. I'm going to be putting this blower on my LQ4 in the truck over the next few months. I'll post up the process and any road blocks I encounter, as well as my solutions for them. The truck currently has a bone stock 05 LQ4 from a 2500HD in it. The only after market part on it is the FiTech EFI system controlling it and some headers. It's still mated to the original 700R4 and t-case. (they're tired) So I still need to upgrade the fuel system, route heat exchanger system, modify the blower itself, and figure out a belt drive. I'm going to try and do this as cheaply as possible; that said I have already bought the adapters for the blower from mackdaddyparts.com. They are pricey, but I think its worth it to have a tried and true method of mounting the blower. I have also purchased the fuel rail from them, and I sourced some budget 1500cc injectors from Snake eater Performance. We will have to see how reliable the injectors are, they were pretty cheap for 1500cc. This thread may or may not be updated frequently. I don't have a TON of free time most weeks, but I will try to keep the instructions of anything I do in depth. Cheers
Total cost so far:
LQ4 engine and swap parts - $3,000.00
M122 Blower - $800.00
1500cc Injectors - $400.00
Adapters for Blower - $1400.00
Billet Fuel Rail - $550.00

The truck

The blower, upside-down

 

Injectors arrived from Snake Eater Performance. Seem pretty tight from a visual inspection. The adapter for the blower are in the mail and should arrive soon.



Flow Sheet

 

The adapters and fuel rails came in. I did run into a small issue. I bought the wrong height injectors. I couldn't find any reliable info on how tall they were supposed to be. I got around this with #8 ID 5/8" long nylon spacers. I have aluminum ones but I still need to shorten them. The nylon ones proved I could do this instead of buying new injectors. The parts look and feel pretty nice. If you get them, make sure you give them a good wash, theres still some metal shavings and sharp edges. I haven't found a machine shop to mill the intake down, so I'll probably have to hack it myself. Once everything is assembled, its over 100lb I'm pretty sure. That much closer to installing it. Still need to get some pulley idlers and relocation.

 

I couldnt find a shop to cut the throttle body mount for me, so I did it myself with a hacksaw and some sand paper. Measure 1.25 from the bottom up and make a cut with your prefered meathod. Then, glue or clamp some p50 paper down and lap it flat. Then use p150. You should be left with a machine flat surface. Now i was going to bolt my plate to it, but decided using EA9394 adhesive would be better. You can bolt it down if you want. But this saved me time and having to use a gasket. This will make clearance for the blower and the valley cover.

Before cut

After cut

Raw cut surface

Lapped surface with drilled holes

6061-T6 .100" thick plate. 1.5"W x 3"L

LOCTITE EA9394

Applied

Solid bead all the way around

 

I re-installed the throttle body / relief valve mount. Shown is the added clearance by removing the lower PCV connection. I have also re-installed and bent the cable for the valve. It must bent to clear the valley cover as well. I did this with a pair of large vice grip plyers and channel lock plyers. Once bent, the valve must remain closed when no vacuum is applied to the cable control canister. With vacuum. the valve must be fully open. Bend your cable retainers accordingly.

Reinstalled adapter

Modified cable retainer 'rear'

Modified cable retainer 'front'

 

Hey, long time no update. Life and such.
Any who, the engine for my build has changed. I have an L76 from a G8 now, but this blower is still going on. Right now I'm trying to figure out the throttle body. Most people (mackdaddyparts included) use an adapter and pipe to make a 90* turn and attach the throttle body remotely. I don't want to do that. I think its ugly. Problem is I also want a 102mm throttle body. LARGE. I'm having some fitment issues. Right now I don't think I'll have the clearance between the body and the valley cover. Right now what I'm thinking is either spacers to raise the blower up 1/2", or chopping the body linkage up and moving it closer to the bore of the throttle body. Not sure yet. Also, the adapter plate I made for the throttle body has been rotated 90* to fit it sideways. It's too wide to sit normally.

Clearance me no have.

I'm going to bevel the adapter plate inward

BIG

 

I've been doing some drawing in Fusion 360 to come up with ideas. If I make a spacer it will look something like what I have attached as a photo. I sent it to a CNC shop to have an estimate done. If it's not super pricey, I'll have them made and move on with the project like that. If anyone was curious about the blower mount venturi dimensions, I suppose you have them now. In a rough sense. Considering I need them to be so thick, the price of material is going to be pretty steep.