extremeracer

Hi

Are there any members running the Holset HY35 on a B16A

I have gone through the Holset thread but have been unable to find some concrete numbers and results

Im looking at using a HY35 on a stock B16A - aiming for 250whp now on low boost(12 psi max) every day.

And the ability to produce more power when running higher boost on a built motor at a later stage.

I'd like to use a Holset , I was looking at the HX30 but its too unproven so the HY35 looks like the next best option requiring quick spool.

Can this Turbo work for this application - ive been doing a lot of research on the Holsets and everyone says they require higher boost levels to operate efficiently

Im @ 5000ft elevation so my pressure ratio is higher @ a specific level of guage boost pressure - so im thinking that would help bring the turbo into its "efficiecy zone"

Eg. @ 12 psi PR=1.97 @ 5000ft
@ 12 psi PR= 1.8 @ sea level

Please chime in on you experiences and recommendations regarding HP potential and HP achieved and Spool time

Thank You

extremeracer

Bump for info - plz

95civhb

you'll do fine with that on the b16... was looking at running one on my z6...

they are more efficient at higher boost levels, but you shouldn't have a problem hitting 250 at a low boost setting.

the general consensus on HP is that they hy35 should be good for about 400hp... (from what I've read anyway)

HiProfile

THey flow around 55-60lb/min, which is ~10lb/min more than a 57trim. Even a 9cm version has a bigger exhaust than the typical .63ar/stg3 t3/t4. Given a 20yr old 60trim t3 can make 250whp at 9psi (~35lb/min), you shouldn't have any issues. However, quick spool is a relative term - it will be quicker than say a HX40, but still be slow. Don't expect much boost before 5000rpm.

BTW you higher altitude also means you will have better exhaust flow (less backpressure). You don't really have to crank the boost much more to make the same power.

marcj

I'm running a 12cm^2 HX35 on my b16a. it spools like a drag car.. nothing before 5k rpm, just like HiProfile said. The smaller housing (9cm^2) will help a bit, so on a stock b16 I'd say go for it as long as you're okay with some lag. I REALLY miss my T3/T04E 57 trim though. It was a better daily driver setup, and I'm considering another T3/T04E temporarily until I get my stock integra swapped and back on the road.

marcj

for 250whp, just get a straight T3 for 80 bucks

extremeracer

Thnx for the input - Are you running a true divided split pulse manifold on your HX35 ?? or are you running a normal manifold mated to the divided turbine flange ??

The DSM guys seem to get really quick spool from the Holsets - I know thats using the BEP 0.55 Turbine housing, but from their data they state that the 12cm^2 housing with a true divided split pulse manifold provides similar quick boost response to the 0.55 A/R housing
20psi @ 3500 rpm on a 2.0l

@marcj: What power levels are you making at what boost with the HX35 on your B16A
Is it the 7 blade 60lb/min HX35 or the 8 blade 52lb/min version ??

If I can get the HY35 to start boosting from bout 4500rpm then I'd be happy with it !

Minor Threat

Disagree, I had full boost (20 psi) on my Z6 by 5300rpm with an HY35, when I ran it off the wastegate at 6-7 pounds it would hit that around 4000rpm IIRC, I never logged that one. It actually spools a touch early than most 57 trim .63 AR turbos going by the logs I have and the dyno graphs I've looked at. Turbo was on a topmount manifold as well, you could probably shave a few hundred more rpm off the spool time if you ran it on something like a mini-ram/shorty style manifold.

marcj

you can't compare 4G63 and a B16A.. it's like comparing apples with oranges. Plus a .55 A/R housing is counter productive IMO. You're choking the potential of that turbo by throwing the ratio off, like having a TD05H exhaust housing with a T4 compressor.

I'm running straight T3 flanged manifold into the divided housing. I actually have more lag than I would want on the street as fore mentioned.. but I can handle around 600whp now compared to 400whp with the last turbo.

If this is a daily driver car, I would say go with a smaller turbo more suitable for your goal. that hy35 can handle twice your goal easily, and you pay for that in lag

extremeracer

I am aware that the B16A and 4G63's are different - Im not expecting to reach the same boos threshold at the same RPM as a 2.0 liter

Im still learning with the Holsets - and i'd really like to give them a try - but Im trying to gather as much data as possible from actual users

All I was trying to point out with comparing it to the DSM's is that from their results is that a comparatively sized Holset spools faster than the Garrett/Turbonetics equivalent as Minor Threat also stated !

They have also reported good reduction in spool rpm with going to a true divided setup to take advantage of the increased VE and smoother flow of the divided setup.

If you are getting boost at 5000rpm with your undivided/divided HX35 then id expect that rpm to drop to 4500rpm with a split pulse divided manifold from tests I've seen.

And the HY35 would spool similar to that configuration IMO using a guesstimate

Ive seen a VW 1.8T 20 valve make 20 psi + @ around 3700 rpm, 3rd gear pull on the HY35 (its a video clip on youtube)

Thanx again for everyones help !!

marcj

I actually found a pretty big boost leak yesterday coming from loose bolts on my BOV. I have solid mounts, so i'm guessing they rattled loose over time. I will do doing some logs today, and report back in. Spool time on the hx35 is great, I think in the long run a 9cm HY35 would start to choke your setup after 350whp.

I wouldn't worry too much about spool time on a fwd car as long as it reaches full boost by 5500. A little lag never hurt when you rev to 9k rpm. It actually helps significantly with traction. I used to spin street tires every time I saw boost unless I was already on the highway.

extremeracer

Thnx MarcJ - yes plz do report back - it will be greatly appreciated

Heres hoping that fixing the boost leak drops boost threshold quite a bit !

Im thinking that because it is a 1.6l the HY35 will let me get to 400whp - the general consensus is that the HY35 is good to 400whp without pushing it to its limits and the HX35 is better for over 400whp !

Id be very happy with 350whp and broad powerband and quick boost response

Its going into a light chassis - so 350whp should be fun

extremeracer

Any more results/info ??? - PLZ

@MarcJ - did you manage to get some "test data" !!

Thnx

extremeracer

Any more info or results fro MarcJ ???

fastEK2010

I recognize a few of you from HMT and RHMT. Anyhow its a new site but there's some good info here http://turbobyholset.com/forum/holse...phase-pegasus/

marcj

i spool a little earlier now.. 4500 and full boost at 5500..
it's not bad because it makes much more power with less boost. I'm still trying to work out a lean pop between shifts :[

williamscrx

heres my crx b16a hy35 holset runs fine 9psi daily driver https://honda-tech.com/album.php?albumid=15272

95civhb

try not to dig up super old threads... just a tip..

Jimster480

did you guys ever end up doing this? I'd be interested to see some sheets with a HY35 since I am considering getting one.