Hello everyone, been quite some time since I've logged in last, figured I'd come back to my roots for the next installment of car fun. Recently aquired a BBS design v belt manifold and I had a few questions about it all. Currently I've got the manifold, that's it but working on the next phase of my build. At the moment I'm working on installing my FIRST with afr 195 heads and a lingenfelter 211 cam, bought the parts last year and finally coming around to installing them. I know this build isn't ideal for boost but a buddy was selling his manifold and I had to ****** it up.

Few questions
1. I know it's a v belt style but I run an ac delete pulley, without mocking it up I won't know if there's clearance issues. The simple solution is "go v belt" however I'm going to be picky and see if there's a way to modify the stock serpentine OR if there's an aftermarket serpentine setup that would accommodate the manifold design. Anyone with some personal insight?

2. Where should I begin looking for the turbo? Or determining what I should be looking for....

3. What are my limitations on a hyper piston bottom end? Am I going to be stuck on single digit boost for a while?


Ultimately this is a work in progress, I've dabbled with turbos but that's in regards to subaru and rx7's, totally different animals.... please forgive my ignorance I'm more than happy to learn about proper turbo sizing and such just need some pointers to get me shooting down this rabbit hole.

Current configuration of the bottom end is 350 bored .30 over, hyper pistons (budget rebuild) the afr 195 heads and first will be going on there with 32 lb injectors for now. Im pretty sure once I boost it I'll need larger injectors, not sure if the cam is going to like boost all that much but if it will Id like to reuse it as I just dropped a ton of money on the NA build and my eyes are wandering elsewhere already. Plan is to go forged on the bottom end and I'd like to plan out the boost half of the equation so I can take it to my builder and say "this is exactly what I want because I'll be running _________"

Sorry for the jumbled mess and thanks for anyone who can help me out!

 

I would mount everything up and see what clearances look like. You may be surprised. With the FIRST Intake you may have to tweak stuff anyways quite frankly.

I will say if it will fit I'd be looking for a larger turbo. 76mm minimum if it fits I'd be thinking more like a PT-88. With that much engine you'll want a fuel system before you even think about boosting it.

I would definitely go towards the high side on the ring gap with hyper pistons. Also, what is the piston you're using? Some are certainly better than others.

Lastly, I wouldn't even bother with turbo anything until I had more fuel. You'll be hitting those pretty hard with no boost.

 

T76 is big as you can go on the BBS manifold.

-- Joe

 

You'll have to get it on to mock up anything in detail. Those manifolds are designed for small footprint turbos so you dont have alot of room to work with.

Theres no real limit on boost but rather cylinder pressure and power/heat. All of that increases with boost, so if you can keep tune as safe as possible watching exhaust heat, staying out of detonation and cooling intake charge as much as possible, you can make some big power.

Problem is turbo size.

If it will fit the most power you will make will come from a turbonetics tc series 76-78 mm comp and 68mm turbine with the .96 a/r.

It may have hood clearance issues

 

TC 7875 1.15 AR here, I have about 1 1/4 hood clearance. I had to modify the waste gate location by adding a 6 inch long section of 2 inch inside dia schedule 20 pipe for my 46mm waste gate because of boost creep. Other than that the car is making over 700 rwhp on 93oct at 16.5lbs of boost at 16* timing.

 

I have a turbonetics HP76 on my bbs setup. The compressor housing is slightly larger than the TC series turbos. I had to dent the front of the valve cover slightly. I modified my stock serpentine setup to work with the v-belt bbs manifold. I don't have a/c, but it sound's like you don't either. I removed the wastegate from the turbo manifold and put it in the crossover pipe under the car. I hated the sound of the open wastgate on the bbs manifold. I was also getting boost creep. I routed the wastegate back into the exhaust and it was easy since the new wastegate location was right by the downpipe. ill take a pic of the belt setup.

 

I just swapped the smooth pulley on the tensioner to a grooved pulley.

 

What'd you grab the grooved pulley off? That's EXACTLY what I've been wanting to do.

 

I honestly don't know. My dad has a **** ton of pulleys from various vehicles. Haha, But I'm sure it's not hard to find. GM vehicles seem to use only a few different diameter pulleys. It's the same diameter as the smooth pulley that was on there. And I actually just used the smooth pulley for a long time. It never hurt the belt. I just changed it over to a grooved pulley last year.

 

Excellent, I'm iffy on the current bottom end as it sits, I'm seeing guys left and right with similar bottom ends that are keeping in in the single digits with no I'll effects, the reoccurring advice is "make sure you get it tuned right and you'll have no problems" Ive been saving up the rainy day fund for quite a while, ready for the forged bottom end. I won't pull the trigger on something I can't use on the next motor, no sense in buying twice.

As for hood clearance I think I'm set, I have a goodmark 2" cowl that I had to remove some sub frame for repair work.

Currently the fuel system is getting worked for the n/a portion of all this. Aeromotive fpr with 32lb injectors for the first, full an run as well. I figured injectors can be easily swapped out. I'm guessing the first step is to pick a turbo, build around that as much as possible. I've got my dad's firebird in the garage as well so I figured I could mock it up to that given that they're dimensionally similar...avoid dinging up my new paint lol