Holset Turbos, PART 3

[Slippi84]

Originally Posted by dsm-onster

Actually, only a 2.5 lb/min difference is shown. BUT! Remember the lower flowing log is of the small 16g at 23psi, 4 psi MORE than the H1C with 15*F cooler intake temps. . .

I'm not immune to the long arm of the law. I was able to run over 7K with the small 16g log because the town policeman let me do it as he monitored the end of the road.

All I could do was 6300rpms in 3rd before having to shut her down. I didn't have my friend protecting everyone around the road. This is the best comparison I could give. The same engine VE at the same RPM. At a level where any 16g has the best chance to perform at its best. Nothing else is really needed.

Gotcha

[JWoodley]

So the general consensus is that a 38mm external WG will adequately control boost on the HX40? I don't mind saving a couple hundred bucks by not having to get a 44mm, but I don't mind it either.

I will be running the 38mm off the 02 housing, but I'm unsure if I would run the 44mm from there or switch to a different exhaust manifold with proivisions off of the collector.

[dnhieu]

on my old setup i was running 23psi just fine, and it held it all the way to redline. i am currently running a ebay 38mm wastegate also. its recirculated off the o2 housing.

im currently running 20psi with my new setup (have not tuned it yet) and its running just fine also...

[dsm-onster]

Be sure to post some results after a tune if you can.

[Slippi84]

Just got my hx40 in the mail this thing is one nice turbo. For $560 I def got a steal. it's not some beat up used one off ebay it was remaned and it looks brand new. Has verrrrrry minimal play like you woudl see on a new turbo and doesn't touch the sides and spinns so freely it's not funny. I had a dual BB turbo that when you spun it it didn't spin this long. I will post pics when I get home but running the t3 divided 18cm housing is def out the question lol. The ocnpressor cover is good size about the same as a to4s cover but with a 3" vband outlet which I will be using a vband connector but the exhaust housing is huge and way too long. It's a vband and all but it comes out like the ebay ones that have a vband adapteron them like they weren't meant to be vband originally. Anyway should be good times with this thing

[1gDSM4g63]

Originally Posted by JWoodley

So the general consensus is that a 38mm external WG will adequately control boost on the HX40? I don't mind saving a couple hundred bucks by not having to get a 44mm, but I don't mind it either.

In your case running 24 psi the 38 mm wastegate is fine. Don't waste your money on a big wastegate. It'll do you no good except boost creep.

[Slippi84]

Originally Posted by 1gDSM4g63

In your case running 24 psi the 38 mm wastegate is fine. Don't waste your money on a big wastegate. It'll do you no good except boost creep.

How is a bigger wastegate going to create boost creep. If anything I would think it would make the car spool slower and make the turbo work harder. This is assuming both have the same spring of course.

[aero_sallee]

Originally Posted by Slippi84

How is a bigger wastegate going to create boost creep. If anything I would think it would make the car spool slower and make the turbo work harder. This is assuming both have the same spring of course.

He just forgot to add preventing or something similar to the sentence.

[Slippi84]

Originally Posted by aero_sallee

He just forgot to add preventing or something similar to the sentence.

Well even so that's a big thing! That's like saying all a timing belt does is keep your engine timed up no biggie. The whole purpose of a wastegate is to alow you to run a set boost level and keep it there. Saying all going bigger will do is a lot you to do that is like syaing all it will do is it's job.

[Mr Peepers]

It won't have any adverse side effects besides likely being overkill at that psi. The general rule with wastegates is the larger you go the less boost you can run without creeping.

[dnhieu]

Originally Posted by dsm-onster

Be sure to post some results after a tune if you can.

will do. i can tune the car myself but i think im going to pay someone to dyno tune it for me. i hope to put down around 450 awhp at around 30psi on a dyno that usually produces very low numbers. ill post the results then...

[JWoodley]

I intend on pushing 30-36psi on this setup. I'm currently building my motor: 2.0 6 bolt Eagle/Ross combo, stock port 1G head, *BC 272s or BC280s*, JMF Race SMIM, and the supporting fuel mods are already there.

So will a 38mm Tial do the job? I will be dumping it. The 38mm internal has held 26psi fine so I'm not sure how that will correlate with the external setup.

[Slippi84]

Originally Posted by JWoodley

I intend on pushing 30-36psi on this setup. I'm currently building my motor: 2.0 6 bolt Eagle/Ross combo, stock port 1G head, *BC 272s or BC280s*, JMF Race SMIM, and the supporting fuel mods are already there.

So will a 38mm Tial do the job? I will be dumping it. The 38mm internal has held 26psi fine so I'm not sure how that will correlate with the external setup.

I wouldn't even attempt to use a 38mm for 36psi on a tubro this size. You realise at 36psi this turbo is more 650whp capable. If your going bolt on ssautochrome makes a half descent(yes I said ssauto and half descent together) 46mm o2 housing with recirc turb built into it vbad housing. This would obviously only be good for a bolt on style hosuing but still. If I didn't have a 40mm off the collector which is the best place for a wastegate I would have gotten it.

[Mr Peepers]

A larger wastegate is needed to run a lower psi without creeping because you are bypassing more exhaust gas to maintain that lower psi.

650whp capable yes, but you are sending most of that exhaust flow through the turbine instead of bypassing it through the wastegate at those power levels. You should be fine with the 38mm Tial.

With that psi, there will inherently be a greater pressure differential across the turbine. A smaller wastegate will be less likely to blow open and when it actually is open it will flow more anyway because of the greater pressure difference.

[1gDSM4g63]

^^^
llllllllll

As unbelievable as it may seem at least someone agrees with me.

[JWoodley]

Alright, so the 38mm is the ticket.

But now do I just let the 38mm flapper...umm 'flap' or should I try to remove it completely?

ORRRRRRRR

Should I get a non wastegated turbine housing?

Pros and cons of each?

[1gDSM4g63]

Originally Posted by JWoodley

Alright, so the 38mm is the ticket.

But now do I just let the 38mm flapper...umm 'flap' or should I try to remove it completely?

ORRRRRRRR

Should I get a non wastegated turbine housing?

Pros and cons of each?

Weld the external controller so that it keeps the flapper shut or get a FP race manifold.

[Steve93Talon]

Originally Posted by JWoodley

But now do I just let the 38mm flapper...umm 'flap' or should I try to remove it completely?

ORRRRRRRR

Should I get a non wastegated turbine housing?

Pros and cons of each?

You'll want to remove the flapper and port the hell outta the wastegate passage, and make sure to work alot on the entry to create a smoother transition to the gated area. Pics:

http://homepage.mac.com/stevestrzemp...f/IMG_2167.JPG

http://homepage.mac.com/stevestrzemp...f/IMG_2168.JPG

[SpeedAddict62]

Originally Posted by JWoodley

Alright, so the 38mm is the ticket.

But now do I just let the 38mm flapper...umm 'flap' or should I try to remove it completely?

ORRRRRRRR

Should I get a non wastegated turbine housing?

Pros and cons of each?

I would say to remove it completely. The less things in the way the better. I don't see how you could run a wastegate off the 02 housing with a non wastegated turbine housing...unless you are talking about running a wastegate off the collector.

1gDSM4g63, he doesn't want to block off the flapper hole, he wants to keep it open to use a 02 housing mounted wastegate. And a FP Race mani would do nothing - it doesn't even have any provisions for a wastegate off the collector.