what is the best street turbo for m30?

marc79euro645 · Post by **marc79euro645** » May 04, 2011 7:25 PM

I'm considering a different turbo to replace my current kkk k27,745 setup.
What's the best for street, using the 745 manifold?
tia
marc

Cactus · Post by **Cactus** » May 04, 2011 9:26 PM

Just buy one from TCD.

Really though, it depends on your boost target. Are you running an entire 745i setup? If that's the case, I'd get one larger than what you already have. M30's are big and blow pretty hard, even a turbo the size of a watermelon wouldn't lag horrendously.

George · Post by **George** » May 04, 2011 9:36 PM

You don't have any real options using the 745i manifold.

You can re-drill it for a T3 (or maybe a t4, I'd have to check my mock-up to see if it would fit it) to accept anything standard.

For reliability, simplicity and anything up to a medium boost level, the TCD log manifold really can't be beat. It will never break, it spools quickly and its a T4 flange.

The only downside IMO is that it only accepts on-center housings which limits your turbo selection.

That being said, for a street car, I would pick a compressor wheel in the 60-67mm range depending on desired hp.

marc79euro645 · Post by **marc79euro645** » May 04, 2011 10:32 PM

Would an adapter plate or redrill allow use of an hx35 or other?
My setup is an 84 m106 with m102 intake, mega squirt2, 3" exhaust. I'm able to get to 18-20# with the mbc closed using jetronic wastegate. I'm actually pretty happy with it. I just wonder how much better it could be?
Manifolds aside, what would be the perfect turbo for say 450 #tq?

George · Post by **George** » May 04, 2011 10:33 PM

450wtq?

GT35R

Gunni · Post by **Gunni** » May 05, 2011 3:37 PM

marc79euro645 wrote:Would an adapter plate or redrill allow use of an hx35 or other?
My setup is an 84 m106 with m102 intake, mega squirt2, 3" exhaust. I'm able to get to 18-20# with the mbc closed using jetronic wastegate. I'm actually pretty happy with it. I just wonder how much better it could be?
Manifolds aside, what would be the perfect turbo for say 450 #tq?

Measuring turbos in terms of torque is not applicable really.

They are constant flow devices , so 450whp or so you´d be looking at a HX40 for some nice work.

marc79euro645 · Post by **marc79euro645** » May 05, 2011 5:02 PM

Seems I remember someone on this board had a mockup of an hx40. was it ever completed? was it ever dyno"d?

Good & Tight · Post by **Good & Tight** » May 05, 2011 6:06 PM

marc79euro645 wrote:Seems I remember someone on this board had a mockup of an hx40. was it ever completed? was it ever dyno"d?

Here's my HX40 dyno

http://www.mye28.com/viewtopic.php?t=39675&start=275

marc79euro645 · Post by **marc79euro645** » May 05, 2011 6:31 PM

awesome #s Otis.
How is the lag? How is it around town? I saw a picture in the achives where //arinuts had a 745 manifold mocked up with an hx40, I also have some euro exhaust manifolds that could be used, to custom build a turbo exhaust. any thoughts appreciated.

BATESY · Post by **BATESY** » May 06, 2011 12:59 AM

ive never pushed the boost passed 15psi on my m106 with a stock headgasket.
I thought 16psi was kinda "max" before you start popping the headgasket anyway.

Im running tcd 60 trim k27. I love it, great power and spool. Im running one of georges tial WG adaptors to a 38mm. Set to 15psi. Pull on all kinds a cars.

9mil · Post by **9mil** » May 06, 2011 7:26 PM

BATESY wrote:ive never pushed the boost passed 15psi on my m106 with a stock headgasket.
I thought 16psi was kinda "max" before you start popping the headgasket anyway.

Im running tcd 60 trim k27. I love it, great power and spool. Im running one of georges tial WG adaptors to a 38mm. Set to 15psi. Pull on all kinds a cars.

what kind of #'s are you posting with that setup and what kind of intake are you using? i want to try that 60 trim k27

kid325ix · Post by **kid325ix** » May 07, 2011 2:32 PM

I like where this thread is going..

BATESY · Post by **BATESY** » May 08, 2011 7:24 PM

im using the stock m106 intake with a 535i intake mani. The stock 745i mani broke during removal of the engine.

I dont know what numbers i have, never dyno'ed it. still working on tuning. hopefully get some numbers this summer.

Post by **Brad D.** » May 09, 2011 2:27 PM

You could buy my HX50. That would probably make a bit of power.

///ARINUTS... · Post by **///ARINUTS...** » May 09, 2011 11:13 PM

the holset HE351VE flange is very close to the 745i flange

Bang for the buck and instant spool

Jsanders · Post by **Jsanders** » May 10, 2011 1:47 AM

This thread is really making me miss my car.

demetk · Post by **demetk** » May 10, 2011 8:07 AM

///ARINUTS... wrote:the holset HE351VE flange is very close to the 745i flange

Nice pics Ari, did you need any mods to mount this turbo? How does this compare to the k27 upgraded turbo?

For reference, here's the regular k27 on the left and the upgraded k27 on the right.

Gunni · Post by **Gunni** » May 10, 2011 8:53 AM

If you can control the VGT that turbo will blow everything out of the water in terms of spool and power relative to the compressor size it has.

To me that has to be the single best upgrade path for the 745i manifold users.

I believe the 351VGT has a 60mm inducer which is the same a HX40 , so good for 500-550whp or so, but can spool like a GT28 when you close of the turbine housing.

///ARINUTS... · Post by **///ARINUTS...** » May 11, 2011 12:29 AM

I have not done this......yet.

these are winfred's pics. I know he did do a lot of "massaging" to get the turbo to fit. the vgt can be controlled with an internal wastegate actuator. and I too believe it will be incredible. I've been doing some research online and I'm getting very excited about this holset vgt unit. I want to install one on my e30 m20 and my 745i.

charofire · Post by **charofire** » May 11, 2011 11:59 AM

Hi-
So does the 351VGT have a similar flange to the one you posted pics (HE351VE)? If so, would this be able to fit on a 745 manifold with some massaging?
Thanks,
Paul

///ARINUTS... wrote:the holset HE351VE flange is very close to the 745i flange

Bang for the buck and instant spool

DMS · Post by **DMS** » May 11, 2011 12:10 PM

Waiting for VEMS to start with CAN communication. Then we'll be able to actuate a CAN controlled VGT

Gunni · Post by **Gunni** » May 11, 2011 3:47 PM

DMS wrote:Waiting for VEMS to start with CAN communication. Then we'll be able to actuate a CAN controlled VGT

the later ones where pressure controlled and didn´t fail as much as the electronic motor ones.

As pictured here

http://www.holset.co.uk/mainsite/files/2_5_1_5-VGT.php

DMS · Post by **DMS** » May 12, 2011 3:08 PM

But for this you need air pressure like available on a truck. Even though we're still running a electric actuated at work.

Gunni · Post by **Gunni** » May 12, 2011 5:42 PM

DMS wrote:But for this you need air pressure like available on a truck. Even though we're still running a electric actuated at work.

which is perfect, so it´ll stay closed under no boost then you feed it boost and it´ll open. This can be regulated using a PID controller and a boost solenoid then.

marc79euro645 · Post by **marc79euro645** » May 16, 2011 9:19 PM

My megasquirt ll is can ready I believe.
Does anyone know what inputs would be required to control the turbo with can?
map & rpm like ve table?
I'm guessing that the turbo gets power, ground & 2 wires for can signal?
Will the 745 exhaust manifold be too limited for 500 hp?
marc

Post by **Brad D.** » May 18, 2011 4:37 PM

I would be surprised if anyone pulls off the CAN control of a VNT. I also don't have any idea if anyone is actually using CAN enabled code to control anything with MS yet? I have done a fair amount of VNT tuning on OE Bosch and Delphi controllers and it is fairly complex, definitely not what I would call basic level tuning. It would require a fair amount of skill to modify the existing code to output the CAN commands. You would also have to have the turbo manufacturers CAN command dataset that it is expecting to see. This is something that might be possible through extensive trial and error (doubtful) and it is also something that usually isn't available to any one other than OE manufacturers/calibrators.

While I agree that it would be amazing to see this work, and would be a massive performance improvement, it is an extremely uphill battle to make it work.

Post by **mooseheadm5** » May 18, 2011 4:50 PM

Can't we just figure out a pwm actuator?

marc79euro645 · Post by **marc79euro645** » May 18, 2011 5:57 PM

you tube has a few vids on guys playing with the stepper motor, bypassing the can.
I'm really tempted to buy one of these he351ve, probably try controlling with springs & diaphram on boost pressure.
Winfred, do you have any measurement available from outside edge of he351 to block?
I've got about 5/4" from k27 turbine to frame rail clearance,& 3/4" clearance at compressor to frame.
marc

winfred · Post by **winfred** » May 18, 2011 11:28 PM

i don't have the measurement but its gonna want about 3/4" more then is available, that bastard is huge! i may or may not turbo the 81 as i have many other projects but was planning on replacing a section of the frame rail with a flipped piece of angle iron to make clearance, the supercharged e30 is in the road and happy but not completely done, and the re-bodying of my rustbox 85 m635 is my next desired thing to do, depending on how much i like the power i have planned from the m88/3 i may leave the m30b35 alone or sell the 81 633 all together

i was planning on leaving the VG rack locked in a useful position till a good tune was reached and bugs chased away, then maybe a 2 or 3 position linear actuator controlled by pressure switches, start off with a nice tight setting to get it kicked in the ass and spooled then get the cork out of its ass for higher rpm. seen 1.5 jap motors spool that thing by 3k with god knows what for tune, could be wicked with a 3.5 blowing on it, and i got it off ebay for $125 so no big loss if i don't do anything right away, i don't think they go anywhere near that cheap now as they have been both discovered and are not changed at the drop of a hat by the dealers anymore

justin517 · Post by **justin517** » May 19, 2011 2:15 PM

I 2nd the HE351, that is what I will be running, but on a cartech manifold with a homemmade adapter.

the compressor is capable of 600hp and since its a variable turbine housing you can size it however you want.

at first I'm just going to lock it in in the middle somewhere and then vary from there to try to find a sweet spot between quick spool and top end flow.

People also use wastegate actuators to go from small housing to big housing at a certain boost pressure, but I figure that with a decently large displacement (3.4x L) and running 10psi or less (at first) I wouldnt really need the changeover.

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what is the best street turbo for m30?

what is the best street turbo for m30?

VGT