HX40 holset on b34/turbo advice needed

[5timesturbo]

So... I wanna 8-10lbs on a hx40 and just wondered if anyone knew anything about this setup. Is there a lot of lag...what sizes are best for the setup I'm suggestion. Don't know much more than the holset hx series receives quite the rant and rave from the common turbo tuner....how does it play out with OUR engine??

[Good & Tight]

So... I wanna 8-10lbs on a hx40 and just wondered if anyone knew anything about this setup. Is there a lot of lag...what sizes are best for the setup I'm suggestion. Don't know much more than the holset hx series receives quite the rant and rave from the common turbo tuner....how does it play out with OUR engine??

The HX40 IMO is a great turbo for the B34. I would suggest getting a T4 8 blade inducer. You can ride around normally out of boost, and then push the pedal down it spools up quick.
Capable of 500+ hp and very durable turbo.
Check out the Dyno thread I have a few dyno graphs with an HX40 B34.

[Shadow]

I also use an hx40, but on a b35.
Like G&T said it spools up real quick when you're cruising.
For example I'm doing 45mph on a street
and just slightly crack open the throttle some more it'll make that sweet turbine sound instantly and off we go.

Some turbo noobs might think it's slow at spooling because
they expect to make full boost off the line before it even gets
into the power band. Stuff like that. Just thought I'd throw that out there too.

Here's my car on 8psi and the long diff gear.
https://www.youtube.com/watch?v=XvbxNpAhKnI
hope that helps.

[jodystevens]

I also use an hx40, but on a b35.
Like G&T said it spools up real quick when you're cruising.
For example I'm doing 45mph on a street
and just slightly crack open the throttle some more it'll make that sweet turbine sound instantly and off we go.

Some turbo noobs might think it's slow at spooling because
they expect to make full boost off the line before it even gets
into the power band. Stuff like that. Just thought I'd throw that out there too.

Here's my car on 8psi and the long diff gear.
https://www.youtube.com/watch?v=XvbxNpAhKnI
hope that helps.

The turbo sound in that video is badass.

[Good & Tight]

Here's my car on the dyno, B34, HX40, 22psi.
https://www.youtube.com/watch?v=C7aM7XG ... er&list=UL

[jodystevens]

Here's my car on the dyno, B34, HX40, 22psi.
https://www.youtube.com/watch?v=C7aM7XG ... er&list=UL

Sweet! What's your rev limit at?

These vids are seriously making me consider a Holset HX40

[Good & Tight]

Here's my car on the dyno, B34, HX40, 22psi.
https://www.youtube.com/watch?v=C7aM7XG ... er&list=UL

Sweet! What's your rev limit at?

These vids are seriously making me consider a Holset HX40

7100rev limit, I floored it by accident at the end of the dyno pull and hit 8000.

[5timesturbo]

I also use an hx40, but on a b35.
Like G&T said it spools up real quick when you're cruising.
For example I'm doing 45mph on a street
and just slightly crack open the throttle some more it'll make that sweet turbine sound instantly and off we go.

Some turbo noobs might think it's slow at spooling because
they expect to make full boost off the line before it even gets
into the power band. Stuff like that. Just thought I'd throw that out there too.

Here's my car on 8psi and the long diff gear.
https://www.youtube.com/watch?v=XvbxNpAhKnI
hope that helps.

Hey, thanks for the insight... I DO like the idea of the holset...I just hear too many good things about them... I've PM'ed with G&T when I first started this thread about what I heard from a source.....and I guess in the spirit of teaching and participating in a forum I'll throw out what I HEARD. I was told that the hx40 is too big for the 8-10lb boost goal I'm going for... This wont be my first turbo car ...IMHO... street turbo'd cars are best when you have to get in it a bit before the turbo starts kicking in...

Anyhow, I'm still looking for some cheap turbo suggestions... I'd prefer the turbo to be able to mount up to the T-C-D manifold easily

[turbodan]

Best thing about a Garrett is the website they have with compressor maps. Its worth it to spend more just to know what you're actually getting.

A GT3582R 1.06 would be an excellent choice for the M30B34. Great spool and enough air mass for ~600rwhp.

[jodystevens]

Best thing about a Garrett is the website they have with compressor maps. Its worth it to spend more just to know what you're actually getting.

A GT3582R 1.06 would be an excellent choice for the M30B34. Great spool and enough air mass for ~600rwhp.

I've been thinking about a A GT3582R .82 for the b28. The HX40 vids are tempting though.

[turbodan]

I had the .82 on my 2.7 M20. The compressor is too large, but I was able to get away with it due to the large turbine housing. I ran it on an M20B25 for a few months and it actually would surge on spoolup in fourth or fifth gear. A 3071R would be a better choice for the 2.5-2.8 liter range. If I remember correctly there are some off the shelf options available from Garrett with very suitable turbines. I probably would have gotten one of those if I planned on bolting it onto the M20 at the time.

[turbodan]

Actually looks like I was thinking of the 3076R. That would be the one for the sub 3 liter inline sixes.

[jodystevens]

Actually looks like I was thinking of the 3076R. That would be the one for the sub 3 liter inline sixes.

Mmm, yes that one does look good! Where do people normally buy the turbo?

[turbodan]

There are lots of places to choose from. Might check with Todd at TCD to see if thats something he can get for you.

[T_C_D]

Some turbo noobs might think it's slow at spooling because
they expect to make full boost off the line before it even gets
into the power band. Stuff like that. Just thought I'd throw that out there too.

hahahaha Please justify the lag any way you can. A properly sized turbo makes full boost in 1st gear.

[GrayGohst]

I want an HX40. when I get some money my m30 will be 1 bar or bust. Lets not hope I bust. I have been waiting for a boosted bimmer for so long!

[//grecko//]

what injector are you running guys..??? I had 30 lbs injectors with the Begi Fmu and ran lean at 5500...resulting of an blow head gasket. Detonation on cylindre number 3. Only at 8 lbs. b34 short block, b35 head! Gt35 turbo.

[T_C_D]

what injector are you running guys..??? I had 30 lbs injectors with the Begi Fmu and ran lean at 5500...resulting of an blow head gasket. Detonation on cylindre number 3. Only at 8 lbs. b34 short block, b35 head!

That was not an injector size problem.

[//grecko//]

I know Todd. Tuning problem!! Cant understand how you tuned so much m30 only with chip and fmu with perfect torque curve. I was always a little to rich or too lean.

Back to the topic, the Holset turbo doesnt fit on TCD manifold without an adapter/spacer... but Its a good for the m30.

[T_C_D]

I know Todd. Tuning problem!! Cant understand how you tuned so much m30 only with chip and fmu with perfect torque curve. I was always a little to rich or too lean.

Back to the topic, the Holset turbo doesnt fit on TCD manifold without an adapter/spacer... but Its a good for the m30.

The fuel curve was never perfect but the m30 isn't too sensitive to rich AFR.

[Andrew@ORT]

Best thing about a Garrett is the website they have with compressor maps. Its worth it to spend more just to know what you're actually getting.

A GT3582R 1.06 would be an excellent choice for the M30B34. Great spool and enough air mass for ~600rwhp.

The 1.06 is a little large for a street driven car, it's going to be more top end. The .82 will be better for a street built car. My buddy and I are doing a m30b34 with a b35 head and a 3582. Going to gate it at 20. Should be 400 at the wheels with ms2 tuning.

[turbodan]

Reason I say that is because of the way the .82 worked on my 2.7 M20. I figure it would perform comparably with the large turbine on the 3.4. The .82 would spool very soon on the 3.4, which isn't a bad thing. I just put a high priority on a large turbine for the most favorable intake/exhaust pressure ratio.

[Shadow]

Some turbo noobs might think it's slow at spooling because
they expect to make full boost off the line before it even gets
into the power band. Stuff like that. Just thought I'd throw that out there too.

hahahaha Please justify the lag any way you can. A properly sized turbo makes full boost in 1st gear.

The hx40 does to.
Does a properly size turbo make full boost at 2,000 in 1st or
what are you saying?

Is that with a log? I hear a log really spools it up allot faster.

[Andrew@ORT]

Reason I say that is because of the way the .82 worked on my 2.7 M20. I figure it would perform comparably with the large turbine on the 3.4. The .82 would spool very soon on the 3.4, which isn't a bad thing. I just put a high priority on a large turbine for the most favorable intake/exhaust pressure ratio.

Don't disagree at all with regard to favorable intake and exhaust pressure ratio. Looking at the plethora of info available on the 3582, specifically boost logs, you'll find that on most 2-2.5L motors you're making 20psi between 44-5000rpms. Seeing as there's very little info on the m30 with this turbo, my guess is it'll be fully spooled (20psi) around 34-3800 which, is very street-able power. The m30 also doesn't have a very high redline. The 1.06 would deliver more top end power which is better suited for the track. I've considered going to a precision 6266, not sure just yet.

[turbodan]

The 3582R .82 on my 2.7 would make full boost by 3200 RPM in 5th. First gear revs so quick it dosn't spool so early, but it would always be all in by 4500. Second gear would be spooled up by 4000.

I would expect full boost before 3000 RPM by second gear on an M30. These ball bearing turbos are the bees knees.

[Andrew@ORT]

The 3582R .82 on my 2.7 would make full boost by 3200 RPM in 5th. First gear revs so quick it dosn't spool so early, but it would always be all in by 4500. Second gear would be spooled up by 4000.

I would expect full boost before 3000 RPM by second gear on an M30. These ball bearing turbos are the bees knees.

Really? Before 3000 in 2nd seems too good to be true and very early. Given what I've seen on this forum and other forums, the .82 hit full boost by 44-52 on a 2.5L. If this is the case, then I'd rather use the 1.06 to have full boost around 35-4000. The BB turbo spools very quickly and that's why I was choosing that over a journal bearing setup. You've got me second guessing the turbo choice for our project.

[turbodan]

No way it would take until 5k to spool on a 2.5. Not even in first gear with a short diff. I actually did run the 3582R on an M20B25 for a few months between builds. It spooled comparably to the 2.7. No significant difference. Only problem was compressor surge on spoolup in high gears. It would spool right around 3k in 5th on the highway but the little B25 didn't move enough air at that RPM for the big compressor. The 2.7 is apparently just big enough.

The only other factor to consider is the personality of the M30B34. It doesn't like to rev as much as the M20. The smaller turbine might be a better choice for the B34 since it wouldn't make much sense revving past 6k. Where the M20 works well with a 4-7k RPM powerband, the M30 would probably be faster with a 3-6k RPM powerband. That said, I would still go with the 1.06. Its going to make plenty of boost at low RPM. Thats where the ball bearing turbo shines. It doesn't need to be near the full-boost threshold to make noticeable boost.

You'll be happy either way but for what its worth, having run the .82 on my M20 for four years, I would recommend the 1.06 on the M30.

[Andrew@ORT]

Thanks for your input, I think that's the route we're going to go based on what you've said. My buddy just wants to make decent power around town as the car will never, ever see the track. It's just for scaring the ever loving $hit out of passengers.

[5timesturbo]

No way it would take until 5k to spool on a 2.5. Not even in first gear with a short diff. I actually did run the 3582R on an M20B25 for a few months between builds. It spooled comparably to the 2.7. No significant difference. Only problem was compressor surge on spoolup in high gears. It would spool right around 3k in 5th on the highway but the little B25 didn't move enough air at that RPM for the big compressor. The 2.7 is apparently just big enough.

The only other factor to consider is the personality of the M30B34. It doesn't like to rev as much as the M20. The smaller turbine might be a better choice for the B34 since it wouldn't make much sense revving past 6k. Where the M20 works well with a 4-7k RPM powerband, the M30 would probably be faster with a 3-6k RPM powerband. That said, I would still go with the 1.06. Its going to make plenty of boost at low RPM. Thats where the ball bearing turbo shines. It doesn't need to be near the full-boost threshold to make noticeable boost.

You'll be happy either way but for what its worth, having run the .82 on my M20 for four years, I would recommend the 1.06 on the M30.

Information overload....haha. I'm loving it....real advise!! So I'm a little slow sometimes...what did we conclude about a hx40 holset?? How does it compare to this other turbo...GTR..."somethingoranother"....?? Which one is best for a lively 10psi DD...???

[turbodan]

Thats kind of the problem with Holset. Legitimate compressor maps are very hard to find. What is the diameter of the compressor wheel inducer? Just looking at that you can approximate what kind of flow the compressor will support.

The 35R would be best for an M30 at any boost level if you ask me but the Holset might work well enough depending on what size compressor and turbine its got.