rb20240sx

Alright so I've been seeing allot more people running holsets these days. And with information spread out all over the interweb I would like to make a collective source for all s-chassis people running them. Like what manifold you're using, injectors, boost, where you got your rebuild kit, power etc. But most importantly PICS.... I have none at the time as I am waiting on a rebuild kit for my hx30w. So I'm counting on you guys lets see your setups. I ordered the rebuild kit form baeturbosystems $73 shipped.

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95 SE Serengeti sand- RB25 Neo

kalypso123

such a great IDEA this thread.

Most of them are either t3/t4 or t4 twin scroll...
manifolds aren't hard to make with a little patience and a mig. and of course cast irons are easy to come by.

I love holset turbos, HX35 is a good sr20 turbo. I'm a little rusty with reading compressor maps but if anyone wants to know which holset turbo will go with their motor, and respective power gains, just post here and ask me.

I'll get the maps and show you how much boost / power you'll get for each one. took me weeks to learn, but im eager to help.

blo0d

I have a 8 blade holsett hx35... I have a vvl w/p12 cams in my s13... Havent tuned or anything yet, but Im looking to use 15psi daily and ~25psi at the track...

what kind of power do you see at both levels?

Got a 4.3 Gtst Diff also, what kind of 1/4 with the right sized slicks?

lowrider260

I have a Wh1c, which is the same as an early HX35, on my S30 I'm currently running 15psi. I basically unbolted it from the cummins and bolted it to my L28. I did however have to port the heck out of the exhaust housing, wastegate hole, and I eventually retrofitted a bigger wastegate flapper to take care of boost creep.

Stock 280zxt exhaust mani
Stock motor
42# injectors
15 psi of boost
Around 300hp to the wheels

kalypso123

1 psi is approximately 7 hp

[email protected]

Never got it to the track because I sold it
Did 373whp on a dyno dynamics aka heartbreaker dyno at 18psi from tuned by jason at emance. hx35 with BEP .70 turbine housing, 850cc injectors, z32 maf, toda 272 cams forged internals 8.5:1.

kalypso123

thats a how a turbo should look.

blo0d

15x7 = 105hp ...what does that mean?

bb4_96

Holsets are good for cheap power. Bear in mind they were made to work with much greater exhuast volume, so it will effect efficiency. That and they are ship anchor heavy.

Darren

he means gain, so if you're making 200 hp @ 7 psi, you would be making 249 ish @ 14psi... not sure if that's accurate, but i believe that's what he means...

rb20240sx

I was going to ask if anyone was using the internal wastegate in my first post. Can you remember how big you bored it out? And what actuator did you use?

Can you send me the map for the hx30w? I still can't really understand them but I have been trying to learn.

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95 SE Serengeti sand- RB25 Neo

robots

Looking forward to this thread. We gonna rock that shit
Lets say stock 1jz non-vvti with 440cc injectors and HX35 7blade with 56mm inducer 82mm exducer. 12cm turbine housing. Wanna run 18psi and 20psi. What would it be ?
What about he351 with 60mm inducer and 86mm exducer and 14cm ar exhaust ? Turbine wheel 60mm/70mm ? Same boost ?

kalypso123

i'm going to explain how to read it shortly.

edit>>
@ 3000 rpms u get 234 CFM = 7psi
@ 4500 rpms at u get 352 CFM 14psi.
AND you've already reached the max airflow for this turbo. Notice the map ends at about 350 CFM (X axis) for the HX30.

hx30 is too small for a 2.0 liter engine. SR20 flows up to 630 CFM at 7000 rpms. This turbo cant keep up with your motor, and it would be worse on a KA.



you're going to add 105 hp over your stock horse power at Naturally aspirated levels.

kalypso123

I've done this a million times but its been a while.

>>> HOW TO READ A COMPRESSOR MAP. <<<
You can use this method with ANY MOTOR, and ANY TURBO

-------------------------------------------

X - CFM ( cubic feet per minute ) this is the volume of air the engine is moving out the manifold and into the turbo's exhaust housing every minute.*

you'll need Enthalpy tune CFM calculator. (excel doc)

to START, Enter in the CC of your motor, for an SR20 (2.0 liter) its 2000
for a KA ( 2.4 liter ) is 2400... Nissan has the exact cc if you search on google for any motor you want.

Y - Pressure ratio: This is how much boost the turbo is pumping
( 1 bar is 14psi of atmosphere, everything above that is BOOST. )

- 1.0 = 14.503 psi ( remember again that atmosphere naturally makes 14psi on its own... ) thats why the compressor map doesnt go down to 1 cause the turbo isnt spooling yet.

- 1.5 = 21 psi ( 21lbs - 14lbs [of atmostphere] = 7lbs of boost )

- 2 = 28 psi ( 28lbs - 14lbs [of atmostphere] = 14lbs of boost )

ect...

-------------------------------------------

look at the line going through the center of the compressor map, that's indicative of the pressure under ideal boost conditions. the shape of the map defines the effective area of the turbos efficiency.

1psi OVER NA = 7hp gain.

slow92

A couple of years ago I started researching holset turbos. I was going to run a holset hx40 pro and have seen pretty good results with these turbos. There are huge write ups consisting of graphs and all kinds of technical talks on the dsm forums. They have dyno graphs and reported horsepower numbers. These turbos are very popular with the mitsubishi guys. For instance there is a guy on that forum that made 685 awhp on an hx40 and you can get exhaust housings for holsets through bullseye power's website.

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Sr22 in the works

nixapgt

Not an SR, but a holset. Hy35, 1.8 miata, 8lbs. Love the Hy. Full boost by 3300 or so on this little engine.

[email protected]

^^What size rear housing?

rb20240sx

I actually have a 2.5L lol guess I'll try and find a hy35 or hx35.

Nice miata nixapgt. Bet that thing if fun.

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95 SE Serengeti sand- RB25 Neo

kalypso123

hx35 is a big turbo... and it will spool hard on an RB25.



@ 3K RPM = 11 Psi
@ 7k RPM = 39.2 Psi !!!

that's approx 450 - 500hp

( assuming that this map's turbine housing is the one your going to use )


havent done the HY35 yet. maybe later :0)

GroundPerformance

I'm rocking an Holset H1C/H1E hybrid 12cm T3 turbine housing. Practically same spec to an HX30/HX40 configuration...

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kS12

test fitting mine for my rb25det, not sure if i will do it this way or just get a high mount manifold

kalypso123

can the manifold flip upside down?

240Shwag

Not on a RB25 manifold. The front mounting "flanges" are angled the opposite direction as the rear ones.

kalypso123

edit post >>

nevermind i get what your saying.

lowrider260

I initially tried to port the wastegate hole still using the stock flapper, still creeped. Took the turbo back off and removed the divider all the way down to the wastegate hole, solved the majority of the problem. To put it to bed I bought a 34mm flapper from forged performance and ported the hole to the new flapper, No more boost creep. I'm using a custom mounted, shortened, rethreaded 7psi wastegate from a mid 80's 300zx.

lowrider260

I have my own excel spread sheet that I made to calculate air flow. To my surprise my figures aren't far from enthalpy's. I inputted the same data into both my program and enthalpy's and I have a question where your getting such high flow numbers?
I'm getting:
@3000 rpm 156 CFM @ 7psi
@4500 rpm 310 CFM @ 14psi

Regardless, like you said, the compressor housing is not a good match to a 2.0L.

nixapgt

The Hy35 has a 9cm exhaust housing, which is like a .48ar or so. If I ever decide to upgrade, I'll go to the He351cw. Its a 9cm exhaust housing, but has the same compressor side as an Hx40. It moves along nicely as is though, so a change might be a ways off. cumminsforum.com is a good place to buy and turbobyholset.com is good for info and compressor maps.

robots

My friend got an HX30 with the bigger inlet and anti-surge comp. housing
Compressor: IN:49MM EX:73MM AR similar to garret 0.5AR size
Turbine: IN: 64MM EX:52MM AR: 9cm
That actually could be quite a good turbo for 1.8 or 2.0l engines.

Any got the balls to plot the compressor in my last post ? HX35 and HE351 for 1j ?))

kalypso123

I might do it later but I cant right now :0)

Actually WTF, you're right my CFM for a 2 liter is too high but im not sure why...

here's what I used.

rb20240sx

So still not understanding so how would the hx30 be for and rb25. Because you said your cfm's a 2L to much. I'm only looking for around 300-325rwhp and quick spool.

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95 SE Serengeti sand- RB25 Neo