So something new has been brought to my attention.

People have been putting p trim wheels into s5 and s4 hotsides keeping the hitachi center cartridge, changing the plate for the compressor and putting a compressor housing of their choice on with whatever wheel that fits.

I've spent a good bit of time searching but nothing really in depth to show what is compatable.

Like what kind of wheel will fit the turbine housing.

If all shafts are created equal (we know they're not but it's funny saying it.). For instance, could I use a gt3582 shaft and wheel designed for an .84 or .82 a/r housing in my hotside without having to hog it out? Would i use bearings FOR the gt3582 or the hitachi bearings?

Can you order different cold side back plates for the same compressor housing to fit your chra?

I'm new to this (diy hybrid stuff....) so hopefully someone will be able to help. I like cheap and good. I dont care how long it takes.

IIRC aftermarket wheels these days are individually balanced meaning you can lego it up, slap it on, break it in and then put as much load on it as it's designed to take without having the wheels knock on the housing in a matter of weeks?

Thanks.

 

The standard GT35 turbine wheel is smaller than the P trim.

 

the center cartridge is basically a small shaft t4, so most of the small shaft t4 bits bolt onto it.

if you want a larger turbine you have to get the turbine housing machined for it. since you're not changing the small turbine housing, there is a limit to how big you should go.

 

BNR changes the center cartridge for a GARRET unit.

 

Yeah. To big a difference in hot/cold sides will cause the turbo to wobble itself apart or the housing could crack from thinning the material out too much.

 

I don't think a large difference of hot/cold sides will negatively affect the balance of the shaft/wheels as long as they are balanced, but would affect spooling and intake/exhaust flow...?... I could see how the center housing could crack if you removed too much material, but you are getting away from the cheap 'hybid' theme and moving toward a full turbo upgrade.

A hybrid is just a cheap way to squeeze more out of a wimpy stock turbo, and shouldn't be used for High Power applications because of their limitations and a full turbo upgrade would give you the benefit to size the turbo correctly for your wants/needs for your specific setup.

Once you add up the cost to do all the machining and parts, you probably could have afforded a larger turbo altogether... but then comes exhaust (dp and mani) and possibly intake piping.

If I'm not mistaken, I think you can get a BorgWarner turbo for around the price of a BNR hybrid.

 

Hybrids aren't that cheap, especially when you factor in all the extra work you need to pay to have done on it to make it work. And you definitely should get components balanced if you're lego-ing it, they are not all made in balance.

My experience was with an HKS Sports hybrid turbo, it uses a T4 hotside with o-trim wheel, internal wastegate, and I used the compressor backplate, housing and wheel off a precision SC 6152e (same compressor wheel as a gt35R). It was about as good as a "hybrid" gets, but the only hybrid thing about it was that it bolted to a stock downpipe, still needed a T4 log manifold, etc.

You should contact BlueTII, he has the most experience I know of with pushing hybrids to their limits, but I think he might agree that you're best off going with a budget T4 setup then using stock pieces. Even FD twins seem like a better option to me then most FC hybrids. That's just my two pennies

 

well if you look to the top, howard coleman was nice enough to solve for area for a huge number of turbine wheels.

if you notice, the stock FC turbo actually has a compressor that is smaller than the turbine, which is weird. something like 3.5" C vs 4.2" turbine

putting in a V trim wheel, for example, makes the compressor and turbine basically the same size. which is pretty neat.

nothing wrong with having a simple 250-300hp car

 

from what ive learned any standard shaft T3 or T4 center will bolt up to the stock exhaust side. the stock center section is standard T3/T4 with 16mm coolant ports, with standard T3 oil inlet and outlets. So any T3/T4 compressor side made for T3/T4 should fit. you may have to run different coolant lines if they arent 16mm, but no big deal

I recently made a hybrid with a garrett BB center and it all bolted up, except the oil return was moved slightly forward, but it still fit with minor oil drain tube clearancing. built it from a 60-1/p-trim chra

 

is there a master thread somewhere that talks about all these hybrids?

 

I dont think so, info on hybrids is pretty much spread around the forum.

Theres some threads of hybrid info over in teh 2nd gen forum and here in the single turbo forum.

It would be nice to consolidate them into a single place.