Should I go bigger than a hy35?

[Soul]

This project is just meant to be a fun play toy (I've sunk several grand in so price isn't a problem really, not bragging just stating my stupidity in the pursuit of :turbob: ) any way I'm thinking that with 3.73 gears and a c4 I'll be playing 90% of the time around 3k when goin down the road. So Would a hy35 be just about right or should I step up? I wanna be able to stomp it and be in spot where I'll get boost. Any ideas or comments works.

[fordnut71]

i think it should put you mighty close to boost under load.

in my ranger n/a i have a 4.10 gear with the 5 speed it revs at 2800 rpm on the highway if i punch it,it will jump right way an start pulling. so basicly i dont have to downshift to pass slower cars.

[AJ_Fritz]

the HY will be spot on with boost. its going to be fun but it wont have the top end hit a larger cm turbine housing would have. with the hy having only a selection of the 9 you'll be pretty much stuck. atleast until something bigger can be installed.

you'll like it.... for a while atleast ;)

[Soul]

OK I posted this up on turboford as well and I got a different response without an explanation. Basically I was told that an hy35 with 3000stall converter will be a dog taking off? If so what part do I need to change the turbo or the stall. Keep in mind I'll be driving this on weekends through town (the dreaded stoplight). I don't mind suffering a little hence the full manual valve body but I don't want to be ridiculous.

[AJ_Fritz]

i seen the reply on turboford you are talking about and i think hes mistaken. if he thinks a hy is a big turbo then he hasnt seen a big turbo yet. the hy is comparable to a garret T3/T4 hybrid. its hard to explain how it is going to compare to another turbo without you knowing a little more then you currently do. there are 2 ways to determine how much a turbine and housing are going to flow.

the turbine housing is a nozzle but the turbine diameter also has an effect on how huch energy is being directed onto the turbine. if you increase the diameter of the wheel the nozzle gets bigger given the same size housing, and will flow more. the 9cm housing on the HY is about the same size A/R as a garrett .63 BUT has a turbine wheel the size of a stage 3. the compressor will make about 400 horsepower. with a desent flowing head your going to have full boost within a second at anywhere above 3000rpm

[Jesshwarren]

A HY35 is a mid to smaller size turbo. Def not any to large & I would never run one with the power I am making for fear it could be a restriction.

[muddpawz]

where does the HX35 fit into the picture versus the hy? im thinking about getting one for my swap, looking for 350ish hp on a streetable built motor

[Soul]

HX is the next step up from the hy, I think I may end up going HX since I won't notice the hit in lower end. BTW Thank you for the help I find this forum much more friendly then some of the others.

[Jesshwarren]

The HX is the same as the hy with a larger exhaust housing. A hy compressor is not to small, it's the exhaust housing that will create to much back pressure on your exhaust side when going for high boost.

[Soul]

Ok I read that 3 tiems Jess and I think I understood but to be sure.
* The Larger exhaust housing on the HX will create Less restriction therefore I can make more boost with it.

Did I get it right lol? Trying to wrap my head around all this.

[nagelandy55]

You'll be able to make more efficient boost.

[AJ_Fritz]

its kind of hard to explain it properly. turbocharging isnt a totally free hp option. its like super charging. you want to delicately balance your compressor and your turbine. just because the compressor will make 400 hp dosnt decribe how that power delivery will feel coming in. if the turbine is a rstriction at say the 300hp level then the powere curve is not going to be very peaky. its going to slowly climb until it reaces 400 hp. the pressure ratio is going to be out of site. boost will come on fast but will feel very flat. like it doesnt do much. free up the turbine a little with the same compressor and boost will come in a little later but HP will rise fast and it will fell like your getting hit in the back by a truck.

the hx and hy 35 have pretty close to the same size wheels. its the housings that are different. unless you have a fairly stout engine i'd stay away from the HX. without a paired header the hx is going to feel like its going backwards while your waiting for boost. then when it finally comes in you'll be so far behind there will be no catching up.

[AJ_Fritz]

turbocharger pressure ratio explained.

the turbines job is basicaly to collect the exhaust energy and transmit it through the shaft to the compressor. the energy comes in 2 varietys flow and pulse. for now we will be consentrating on flow. if flow is restricted it becomes pressure. restrict it to far and you hit a brick wall. you want a turbocharger with a ratio of 2:1 or lower. meaning it takes 2 psi on the back end(turbine) to make 1 psi on the front end(compressor). the lower the pressure ratio the slower boost will come in but the more effecient the power made will be. it all comes down to how long you can wait for it and if its going to be worth it.

pulse energy is a little more complicated and i am not giving up my findings yet. lets just say for now there is a little more to it then a straw pointed at a windmill.

[Soul]

Ty for the info. I'm afraid to step up any bigger than the hy due to the fact my head is only polished. I went thru and cleaned all the rough parts but didn't port anything. Only real mod I'm doing ot the top end is the bo-port cam and header, OH and 65 mm t/b.

[muddpawz]

so the hx is the same turbo as the hy, with a larger housing, therefore being more effecient, creating more power on the top end right? how much power would you have to be making to not notice the low end lag? im going to put my stock 87 tc motor in next weekend and want to know what turbo to replace the stocker with right off the bat. p.s. ready for a header jess!!!

[muddpawz]

what do you have to do to get the 65mm t/b to bolt onto the stock manifold?