help with turbine housing/wheel options for a hybrid

[removable_emu]

Hey guys, to make it short and sweet, I want to hybrid a turbo, but I don't know what exhaust wheel and housing to use to yield optimal results. Now for the story behind this problem. Last night/this morning I was at my friend's shop helping him reassemble his RX7 (late 80's turboII) that has been down for the last 2 months, and he told me that if I wanted it, I could have one of his "backup" turbos for free. (this guy finds crazy deals all the time so he's always got like 3 or 4 extras just sitting around). So, not wanting to pass up a free turbo, I looked around and found a 60trim T04B with 0 miles since he rebuilt it, and he said that it's mine if I want it. My dilemma is that I like the power potential of the 60trim, but I'm not a huge fan of the laggy spool up time. At first I had the crazy idea of trying to hybrid on my T25 turbine wheel and housing, but I really don't think that will work. Really though, I'm just looking for a combination that will get me full boost by 3 or 3.5 k, if that's even possible with the 60trim compressor. And please don't yell at me about supporting mods, because I plan on doing this all at once (I've been living on like $20 a week for my last few paychecks just to save up a bunch of money for my car). Any help you guys can give me will be greatly appreciated.

 

[Eliteracingghmi]

I've been looking at doing that with my ported 14B. I'm just wondering if, since the housings are identical, I can put a 16G compressor turbine into my ported 14B and get the same (or close) results. All my supporting mods are in my vehicle profile.

 

[Maglin]

ok here is some answers that are fairly on I believe. Putting a 60 trim wheel on a TDO5H turbine wheel is way bad. Going to have tons of backpressure as that tiny TW is going to have a hard time spinning that hugh compressor wheel. You will also run into a lot of compressor surge at low boost/part throttle cause yes it will spool faster but you are going to drasticly change the surge line. The frankinstine 4 I think it was used a TDO5H TW and a 46 Trim CW in a TDO5H Compressor housing. It had lots of problems with compressor surge and the Larger 60 trim wheel is going to have even more problems.

What is the A/R on that 60 trim's hot side? Probably .80+ since it was going to go on a rotory. Rotory's usually love bigger A/R's and usually they run 1.0 +. You can get a small A/R mitsu style housing from Bullseye or PTE for that turbo.

Putting a 16G CW in the 14B housing requries milling out the compressor inlet and also milling out the wheel profile inside the compressor housing. It's cheaper to buy the wheel and compressor housing from say FP and just bolt it on and get it balanced.

 

[Eliteracingghmi]

Putting a 16G CW in the 14B housing requries milling out the compressor inlet and also milling out the wheel profile inside the compressor housing. It's cheaper to buy the wheel and compressor housing from say FP and just bolt it on and get it balanced.

Yeah, that's what I decided to do.

 

[92awddsm]

ok here is some answers that are fairly on I believe. Putting a 60 trim wheel on a TDO5H turbine wheel is way bad. Going to have tons of backpressure as that tiny TW is going to have a hard time spinning that hugh compressor wheel. You will also run into a lot of compressor surge at low boost/part throttle cause yes it will spool faster but you are going to drasticly change the surge line. The frankinstine 4 I think it was used a TDO5H TW and a 46 Trim CW in a TDO5H Compressor housing. It had lots of problems with compressor surge and the Larger 60 trim wheel is going to have even more problems.

What is the A/R on that 60 trim's hot side? Probably .80+ since it was going to go on a rotory. Rotory's usually love bigger A/R's and usually they run 1.0 +. You can get a small A/R mitsu style housing from Bullseye or PTE for that turbo.

Putting a 16G CW in the 14B housing requries milling out the compressor inlet and also milling out the wheel profile inside the compressor housing. It's cheaper to buy the wheel and compressor housing from say FP and just bolt it on and get it balanced.

Its not a td05 housing, its a t04b which makes a huge difference.
To the original poster, it will still be slightly inefficient with the t04b compressor housing but not as bad as maglin made it sound. If you are worried about spool time, you need to find out what turbine wheel it has. The turbine housing size doesnt really matter because you probably wont be able to use it anyway without replacing your ex manifold with a t3 flanged manifold. Get the specs on the turbo and then get a bullseye housing to fit it so it will bolt to your existing manifold.

Regardless of what it is, I dont think you will get 20 psi before 33-3400 rpm. You said full boost but what would that be for you? I know people that run 15psi as full boost on pump and I personally run 25psi as full boost on pump. That makes a difference in spool time also..

 

[Maglin]

Its not a td05 housing, its a t04b which makes a huge difference.

Opps. It's a T-25. I saw stock and thought 14b. The T04B compressor wheel i don't think fits on the turbine shaft of the T-25. I'm not 100% but I think the T04B is a larger shaft. I know the T04E is a larger shaft. I have 2 of them in my garage ATM. And I wasn't talking efficiency with the turbo. The surge line will drop drasticly with that tiny of a turbine wheel and you might not be able to stop compressor surge. I'm not saying I know all on turbo's. Call up a turbo company like PTE, Bullseye, or FP and they should be albe to tell you what to expect. I would imagine if it was a great turbo it would be all over the place. The Frankstein's I guess was kind of popular back in the day but the uncontrolable compressor surge made for a fairly short turbo life. And with the 50 trims all over the place at very cheap prices they have all but disappeared.