More M50 Supercharging questions?

[dicko]

Just looking for a bit more advise on supercharging my M50, I am hoping to start getting some bits together over the next few months,
This is what I am thinking of .
1: I am taking the head of and checking bores and pistons if all right I will rebuild with m51 tds crank stroking it out to about 2.75 liter and 9.75 c/r
2: I am thinking of a eaton m90 with bypass mounted on a custom manifold with a charge cooler built into it and may be an electric clutch .
( would love a whipple but cant find one for resonable money )
3: 42lbs injectors and emerald k3 ecu with map sensor and wideband lamda
( thinking of running just of map and trottle sensor no MAF is this a bad idea for everyday car)
4: I was going to change to m20 flywheel and keep the e34 zf sport gearbox .Thinking of getting a tds clutch for the extra torque

What do ye think of that set up about right or way off

I reckon 300bhp is realistic after sc power drain is taken into account at 8 psi of boost.

Any help regarding where i can find injectors ect and advise from all the diy supercharged people on here would be great

[Gunni]

WTF? 300hp for all that work.

M50´s can do 500hp+ on stock internals when done with a turbo.
Your way of 300hp is the most expensive one I can think off.

Stock engine
uprated clutch
aftermarket ecu
Holset HX35
ebay intercooler
charge pipes.
42lb injectors
custom exhaust
custom exhaust manifold

May cost , but I don´t the work required to make it work is any less then your SC idea.
But I´m biased towards turbo´s
Why?
Cause they rule, that´s why ;)

[dicko]

sounds a bit daft alright when you put it like that but numbers dont tell all the story , Ihave driven a couple of big ish bhp turbo cars and hated the way the delivered the power not a lot till they get to 3000rpm then rev to red line so quick you hardly have time to grab another gear , good for track days but no good for normal use .
300 bhp is conservative estimate what i am looking for is more torque, 300bhp is loads for a e30
I will be doing everything my self bar mapping .
No lag and steady pull is the goal rather than nothing nothing woosh power change gear.

[Gunni]

Well no lag is what a HX35 will do to a M50 as witnessed on similar RB25´s.
Hell it´s awesome on a M20

It´s proper boost control that get´s you great drivebility in turbo cars. as well as other things it´s one of the major contributors.
M20B25 completely stock makes 1bar at 3,5k on a HX35, that´s similar to 2900rpm on a M50,
and 1bar on a M50 is good for high high 300´s and crazy torque,

boost starts to build at 2500rpm on a M20,
Then you can have progressive boost control with throttle position as well.
If you have had bad experience in turbo cars it´s because of bad setups.

[Gunni]

Ohh, 8psi boost on a HX35 would probably be seen at 2500-2700rpm on a M50.
And 300hp on a M50 is only about 10psi,

[dicko]

That sounds interesting would love to see a dyno plot of one of these set ups .
The last turbo I drove was a 330bhp scooby set up by a scooby specialist in the uk . it was horrid to drive normally .
What sort of money do HX35 turbos go for . and do you reackon i would get away with 1bar of boost at c/r of 9.75

[Gunni]

I would fit a steel gasket for lowered compression, ARP headbolts and the engine will be good for 500+

I would expect something like this.


Problem here is that the ramp rate of the dyno was probably not slow enough to allow for low rpm boost to develop.
But you can see that it has quite alot of torque, and that is with a normal wastegate controlled boost, which tends to leave a curve like the boost curve you see.

That´s dynojet RWHP , so I´d say it´s DynoDynamics flywheel power.
That´s something I would expect from 10psi, and with 10psi coming in alot sooner and managable with electronic boost control the drivability is alot better. TCD does NOT make kit´s for RHD vehicles so a custom exhaust manifold is required.
HX35´s go for about $200-500 on US ebay.

I would not hesitate to run 1-1.3bar on a M50 with a HX35,
that´s 400whp territory.

S50B30 and B32´s usually show 250-260lbs torque and 300hp,
that 10psi M50 shows 50lbs more , I think says the lot, as well as allowing
With electronic boost control you could have a more of a torque engine, by lowering boost at higher rpm´s if that´s what you think you want.

[dicko]

Thanks for the help I think you have changed my mind will keep my eyes open for a holset hx35 .
I have seen a couple of hx50 are these too big for my set up , also I take it i will need to replace my fuel pressure reg to one that handle boost +vacuum can you recommend one .
also external wastegate what are the best ones and when you say electronic control do you mean the ecu controls solnoide valve regulating vacuum to waste gate to stop over boosting at high rpm.
thanks again for the advise good to here from someone how knows what they are talking about.

[Gunni]

The stock FPR works fine under boost.

for wastegates you can´t go wrong with TIAL.
Either ecu controlled or from a standalone controller , it regulates pressure to the wastegate to control the location of the wastegate valve which will both help with low rpm spool and allow for boost higher then the wastegate spring would control.

I suggest you take a look at this webpage for some more info.
http://www.turbobygarrett.com/turbobyga ... enter.html

[dicko]

Cheers will do a bit more research , do you mind if I contact you if I am stuck for info.

[dicko]

Sorry just looking around on ebay , hx35 have a built in wastegate , would you recomend this to be locked closed and fit external type .

[Gunni]

yes
you can buy wastegate block off plates on ebay as well, they have threads that allow you to put a bolt in to lock the
original wastegate door shut.


just post into this thread it will be a good info thread for others.

[ShakeyC]

An external wastegate is a good investment with a holset, the standard internal wastegate isn't well suited to petrol cars, reasonable amounts of boost or temperatures (Holsets are diesel turbos really)

[dicko]

Thanks will do