Hi Guy's just starting to round up bits for my 20B project and wondering what would be a good turbo option. it will be a road car mainly so want to keep lag to a minimum. Aiming for somewhere in the 600bhp flywheel bracket. probably running 1 around 1.0bar boost if that adds up.
I was thinking after my Holset Success on my 13B I would go this route again even if it is a large unit to package. I was thinking a HX50 should do the job? can someone let me know thoughts on this and a suitable exhaust housing size to go for?

Other option I might look at would be Master Power unless people say not.. I have quite fancied trying one of their units and heard good things from a few people over here?

Thanks in advance
Lee

 

Please guy's can I have some input on running the Holset on a 20B? I am guessing here that if a 19cm housing works well for a 13B with an HX40 compressor I want to be shooting around a HX50 or 52 with a 22-26cm housing for street use?

Thoughts please?

 

Any of the t6 borg warners or a 42r. I am running a 45r.

 

Thanks for getting the ball rolling!
Must it be T6 footprint? Will a T4 simply not cope with the flow? Any preference for divided or not?

I could do with some A/R sizes for comp and exhaust. Things like the HKS T04Z are rated to 700bhp+. I am guessing it is not just as simple as the bhp rating though?

Cheers
Lee

 

After I did some searching of setups in Australia, Japan etc... I am going with a Precision Billet HP6235R w/1.06 Hot Side... I know everyone prefers the 40r the 42 or even 45, but that 35r will do MORE than enough for me, and I have seen that setup run on quite a few cars over seas. One of which was making 466whp @7200rpm and 382tq @4000rpm at just 12psi. If i can find the link again to that car I will post it back up.

 

Will be going with a gt4292 with 1.05 on my setup. Hoping for an easy 500+ on pump and around 15psi.

 

^ That should not be a problem, I am making 560+rwhp at 13psi on pump gas with the GT4202R, and 620+rwhp at 17psi with water/meth, running rich. All on a Mustang dyno.

 

Your going to flow so much better with a T6 combo, I run the 42R with a 1.15a/r making 550whp @ 10psi with the streetport full boost by around 3200rpm.

On that note two of my buddies run t4 setups on there 20b one with a 66mm and the other with an 80mm turbo combo both work really well..... the 66mm makes around 520whp @ 12 to 13psi and not much lag and the other is a bit more laggy then mine but you get the picture....

 

Banzai, I have been meaning to ask you (and may have already, forgive my ***** memory), are you logging EMP on your setup? I'm super interested in that data from your setup in particular.

Thanks
ryan

 

Thanks for more info guys. I think by what I am reading and the fact I am going for a street car and would like minimal lag I need to be looking around 1.00A/R exhaust or just over? IIRC that would be what you could run on a 13B also? Is it the Compressor size that makes the big difference? I was thinking the 20B would need a lot more exhaust flow?
Now Olyrx7 the sizes you stated for your friends turbo's would that be Compressor trim size or what?

So in Holset terms I am still guessing I would need like a HX50 compressor with a 19cm min exhaust in this case? I believe the blade specs are something like this HX50 compressor (66mm inducer, 99mm exducer) HX50 turbine wheels (86mm inducer, 72mm exducer

If I was going the more traditional route, would say HKS TO4Z with 1.0A/R Exhaust 0.7A/R compressor be man enough? Compressor wheel diameter is 84mm exd. / 66.7mm ind.

I found a hybrid turbo that is like holset wheels with Garret TO4Z housings if that sounds any better? Has a marginally smaller compressor wheel like 64/93.

Cheers
Lee

 

There the inducer sizes

 

Thank you Oly and thank you for the PM.
So a T04Z or and HX50 should do the trick Just need to find out what housing size relates to 1.00 or 1.05 A/R on Holset!

Or maybe go with the hybrid. but I am not sure on the brand of these. They are made from copy Holset and Garret/HKS parts.

Cheers
Lee

 

there are many different variants of the HX50 from what I have seen... I think it wold be ok, but you could go a bit bigger... Just depends on what kinda power goals/powerband you are looking for.

here is a list of the different HX50's http://www.turbomaster.info/eng/cata...et&pagina=HX50

I have a holset HX50 3535095. I pulled the covers off and measured the wheels. From what I can remember the compressor was a 60mm inducer/96mm exducer, and the turbine wheel was a 70mm inducer/80mm exducer. If your interested, pm me and I can shoot you over some pics and exact measurements as I know it is tough to get exact specs on these units. (at least I couldnt find much info when I was looking!

I also measured the turbine housing for the a/r but I also cant remember off the top of my head.

 

sent you another pm Leeroy

 

Hey rob,
PM not received? Box is no where near full either. Please resend it.. I haven't had one before if you sent another too.

Cheers
Lee

 

By The way guy's Pardon my little knowledge of turbo sizing. but what would you make of this statement. i.e true or false? To me it contradicts itself slightly.

"Regarding A/R size, surely that is irrelivant in this instance, as all A/R does is help vary flow and spool within a set wheel size, its wheel size that dictates turbine flow.
Even a .63 turbine with a 86mm wheel like this one is going to outflow a 1.00 A/R GT4088 77mm turbine wheel for example, never mind a .85."

Yes I understand that wheel size will dictate turbine flow capability but surely the housing size has to impact this as well? so maybe a medium size wheel in a medium housing would flow more than a big wheel in a big housing? Not as the statement implies that a big wheel in a small housing flows more that a small wheel in a big housing?

 

weird, I must have hit the preveiw button and not the send, then closed the window... sending you one right now!

 

Anyone got any more views on the statement I posted in my previous post about A/R and blade size? Just want to get it clear in my head.

Cheers
Lee

 

I always run the largest wheel I can get away with in the smallest housing I can get away with for the power I'm after and it works. If you're only after 600bhp run a 4294R with a 1.0 TiAL housing. Set up properly this will get you low 500's to the wheels with moderate boost levels 10-14psi depending on rotors chosen, port work etc. You can do better with the 4202 but will lose about 400rpm +/- in response. You do not need bigger than the 82mm wheel on the back side for your power level unless you want to add lag. The Tial Housing will allow you to collect all three runners properly and save a ton of weight and space on install.

~S~

 

Thanks for the info Zero R... So my oringial assumption about needing a 1.0A/R housing was right.. I just need to check for optimal wheel size. Compressor wise is the wheel sizes of the HX50 about right?

I am guessing the TIAL housing is the V-band type? I am not familiar with the tubro numbers you referenced so I need to google those to get some better idea.

Cheers
Lee

 

Okay guy's I have found an HX52 unit with the following info.
Compressor - fan – 68 mm inducer. Exducer?
Compressor opening – 106 mm
Exhaust fan – 72 mm Exducer. Inducer ??
Exhaust fan opening – 122 mm

Turbine housing size 16cm

On an HX40 16cm is small for a 13B so I assume the same principle will follow for a 20B? But potentially worse? So maybe I need something like 22cm housing? If so anyone no enough on Holsets to say how easy it is to find and interchangeable turbine housing.. Or how easy it would be to for instance modify a garret one or something to suit?

Thank you
Lee

 

My Hx40 with a 19cm housing spools insanely fast and that's on a 13B (Series 4)...you definitely need bigger.

 

Agreed. I had an HX40 19cm on my 13B and it spooled pretty quick but I was not entirely sure how the turbine housing sizes on the Holsets work. i.e if a 16cm on a HX40 is the same flow capacity as a 16cm on an HX52?

Also this being the case I need to know how easy to get a bigger interchangeable housing and thoughts on 22cm assuming this is a standard size on an HX52?

Struggling to find much info on this.
Again the other option is doing a custom housing if this is realisitc?

 

I've got a Master Power T70 with a garret 1.15 exhaust housing. Based on the calculations I ran I am going to barely be withing the efficiency of the turbo. I think it is going to work fine for 600 hp or so, but a gt42r seems like the perfect turbo and I will likely switch to that once I have the rest of the bugs worked out and I can afford it.

 

I just got an HX52 on the way to me now.. So I will plan to go that route once I can determine what housing I need to get and what is compatible with the core I have.