Ive been searching a TON on this, but can someone tell me if a 38mm tial with an 8psi spring is gonna creep using a go autoworks cast mani.(wastegate at all four collectors) And an hx35? Someone on a bimmer forum said theirs held steady, but this is the ONLY thing i can find on a 38mm and low boost hx35. Any input would be greatly appreciated! P.s. I DO NOT want an hy or he series holset, i would like room to grow, as well as keep the tires from spinning a ridiculous amount. Been there, done that.

 

you're going to have huge creep problems... the hx35 is a nearly a 60lb/min (600hp) turbo. you'll never be able to control that turbo at that low of a pressure with a small wastegate.

typically you can improve boost control and lessen creep by running a decent amount of ignition timing.

also until there's some pre-turbine backpressure the exhaust gasses will simply keep flowing through the hot side of the turbo, it won't want to make that turn through the wastegate. once there's a certain amount of pre-turbine backpressure the exhaust gasses will start to flow through the wastegate more readily as there's resistance from the turbine wheel.

this resistance is in the form of backpressure, air moves like a liquid and it will always take the path of least resistance and from high pressure to low pressure. So when the wastegate opens there's no pressure on the other side of the valve, thus the exhaust gasses will flow through the wastegate more readily than it would the turbine wheel.

 

so in other words, the turbine wheel simply is too big to try to bypass that much pressure through that small of a gate, in turn it keeps flowing through the turbine? seems to me that 10 psi on an hx35 is the bare minimum to hold "steady" pressure on a 38mm. This would net me far too much hp for a stock b18c1 would it not?

 

im gonna assume an he351 would be more controllable because of the smaller hotside, granted it does have the same compressor side as an hx35? Or am i incorrect on this?

 

I wonder what that would be? 350?

 

Im gonna take a wild guess and say 330-370 whp. Anyway, he341 is what ill probably end up going with, now knowing that ill have creep issues. Can anyone tell me how well an hy35/he341 is gonna do at 8-10 psi On a stock c1? Looking for 290-300 whp daily driven. this turbo wont fall off at 8k will it? Sorry about all the questions gentleman, just really want to make the right decision on which holset snail to go with.

 

the he341/hy and hx35 are the same turbo, just slight differences in housing configurations and blade counts (7 vs 8)

 

you could probably get away with running sub 10psi, again it would take a decent amount of ignition timing to do so.

you won't really know till you try.

also that manifold was never designed for a holset... regardless of what brand the cast manifold is you will have fitment problems if you stay with a passenger side orientation for the compressor housing. the holset ported shroud compressor cover is much much larger than a t04s cover and the t04s cover generally won't fit at all so the holset won't even come close. typically a t04e ported shroud (gt30r) is the biggest housing that will fit a passenger side cast manifold and even then it takes a fair amount of block clearancing.

you need to confirm with go autoworks that it would even begin to work, as that manifold was designed around the garrett 5 bolt outlet t3 turbine housings.

and as far as creep for a given wastegate size, you won't know 100% until you actually try it

 

He341/hy have a smaller hot side as well as flow a little less allowing me to run 9-10 psi safely on a 38mm gate correct me if im wrong? I will be fabricating everything myself and the turbo will be mounted towards drivers side with half size rad. Its going into a dc2 and ive fabricated many kits in ef chassis's, so i should be ok haha.

 

It came on the turbo when i got given it. Im replacing it with a 0.63 as its a little laggy for circuit use, be ideal for drag racing though i imagine. It will prob be for sale soon

 

You running way too much oil through it, Holset's don't like very high oil pressure and rely heavily on a proper oil drain. You'd want to put a restrictor in the oil feed line and make sure you run a large ID oil drain with enough angle to keep the oil flowing.

 

True story, I had a large HX55 on a 84x89 engine on Methanol running twin 38mm gates, and boost would creep to 26 psi on a 11psi spring only !! The flow of the turbine is so "free" that there is no backpressure to push against the wastegate valve to help open it, so the exhaust gasses just end up flowing past the wastegate(s). We ended up installing a Turbosmart V60 in the turbine housing itself to rectify the issue.

 

Anyone has a 16cm^2 housing for a H1C for sale...would take a 12cm^ also.

 

Unless you're running a motor greater than 2 liters in displacement that is an all out drag car the 16cm housing will simply be too large and very laggy

 

For a HX35 the 12cm2 is perfectly matched to the compressor flow, only the high flowing HX40's need the bigger housings. I use the 12cm2 housing on RB25 and 1JZ's as well, and it performs well.

 

can't decide...

hx35 7 blade, or a hx40 w/ 62mm compressor wheel?

running as much boost as I can with 92 octane, 10:5 c/r, which would be around 17-20lbs.

shooting for as much power as possible on pump.

 

I'm running a hy35, go autoworks mini-ram, and tial 38mm waste gate. I'm running the 7.25psi spring and my top boost is around 11psi. This is on a b18c1 stock bottom end running 95 pump gas.

 

I'd love to find a 12 cm divided housing that's for external gate. Mine used to be internal and all the crab cast into the housing is an eye sore with my top mount set up.

 

I have a 8 blade hx35w if anyone is interested $300 shipped. Never used it but no shaft play. Missing the wastegate

 

Found a ported shroud h1c for 150... tempting to take it and put a billet wheel in it for giggles

 

Anyone tried the bae 6286 wheel and comp housing?

 

Details?

 

hey guys am running a hx35 8 blade 54mm/83mm on an h22, it made 357whp on 14psi, i have 2 issues, 1st issue is that it would spool up to 17psi and at higher rps the boost would drop to 14 psi, 2nd problem i have is that it doesn't fully spool till like 4800 rpms,is there anything i can do to improve the spool time on this turbo? would a single scroll housing help my spool time?

 

Have you checked for a boost leak? What are you using to control boost?

 

yes ive checked for boost leaks, i found a few but fixed it, am using a manual boost controller, ive swapped wastegates and am still having the same issue with boost drop, and i don't hit full boost until almost 5200rpms in 3rd gear, i use to have a precision 5431 and i would hit full boost at 4500 rpm in 3rd gear. but with his turbo it just feels laggy, i was considering getting a 9cm hotside for to see if it helps, i currently don't know which size i have but its either a 12,14, or 16cm.