Which Turbo ?????

Author
Discussion

andygtt

8,344 posts

263 months

Friday 1st November 2013
quotequote all
dblack1 said:
All the M motors (powering M cars) of that era weigh under 150kgs. The M70 was lighter than the iron headed 6s but not the alloy headed 6s used in the M cars.
stock M70 V12 engine 155kgs
Stock E36 M3 engine S50 152kgs
stock E46 M3 engine S54 148kgs

the M5's moved to a light V8 engine which was 140kgs as it had alloy block unlike the M3 and older M5 six's.

The V12 being used in this car is not a heavy monster its within a handful of kilos of the M3 engines of the era and has mass more torque... as I say with turbos and heavy cast manifolds it was still under 180kgs which is light for a 600bhp engine!
The drawback of the engine is its size... its both wide and long.

So contrary to belief there is absolutely no performance to be gained by swopping out the engine, but a pair of turbos and extra 30kgs will see a doubling of the power output...

anyhow after chatting to the OP there is absolutely no option to change the engine anyhow smile

chuntington101

5,733 posts

235 months

Saturday 2nd November 2013
quotequote all
mighty kitten said:
I did a vgt build using a Holset he531 vgt blower with two actuators , one for boost and one vac fed to pull the vane wide open under cruise . Made 480whp with a 2.3 4pot engine and spooled up nicely .

22cm or 2.0 ar with the vane fully open and an 85 lb compressor . T4 flange with 3.5 " turbine outlet .
Turbo was £150 in perfect order and they are easily found in the us as the electric motor gives up and they don't sell the motor separate .
Standard fitment on dodge rams with the 6bt cummins engine .
Had no det issues at high boost mainly down to the low back pressure but eventually broke a piston getting carried away on a Dyno .
Twins would be easier to package and something volvo td05 would be cheap enough as they have a built in re circ to suit a maf based system which I think the v12 uses .
Haven't seen one in a while but don't they run a separate ecu for each bank ?
You say that compressor moves 85lbs of air?? That's more than a garrett gt35! What rpm did you get full boost?

Also can you explain how you got the VNT to work? Is it a gradual opening as boost increases or more like a waste gate?

Edited by chuntington101 on Saturday 2nd November 12:37

mighty kitten

431 posts

132 months

Saturday 2nd November 2013
quotequote all
I pulled the electric gubbins off and the Holset has a fixed angle vane that slides in and out via a fork in the Chra . The two actuators are connected but the slotted one is vac to allow the boost actuator to do its thing . A pair of lock stops set the min and max positions and rate of spool is a bit crude but done with preload on the boost actuator with a helper spring but an aftermarket actuator with a choice of springs would do the same .
It worked well considering it was on a 2.3 4 pot and would do a bar at 2800rpm and be all in at 3600 rpm holding whatever you threw at it to 7k . Cruise egt was 200c lower than any other turbo I've used on the Saab and boost to back pressure was only 5 psi apart at 1.8 bar . I really wanted to carry on developing it on my 1uzfe powered rod but packaging was just not possible .


Awesome blower but a fair lump to get in an engine bay


This is next to a Holset hx35 with a 14cm housing or 0.9 a/r


Sold it on to compressor racing who do hybrid holsets so it might get developed further

An external gate capped peak boost purely on spring pressure so you couldn't go past peak at any point as it spooled and boost was solid and you could see how the back pressure dropped as the vane opened fully above 4 k . On a 3 litre plus engine it would be easier to set up as the amount of vane travel would be less due to the bigger air pump behind it .

Just had a dig around and its 78 lb not 85 so somewhere between gt30 and 35 but a big cheaper as both units I bought were due to motor failure on sub 20k vehicles and under $200 a piece

Edited by mighty kitten on Saturday 2nd November 18:08

viperash2003

1 posts

115 months

Thursday 28th August 2014
quotequote all
Heloo!
Take a look here.
Nissan 200sx s13, m70b50 , single turbo drift car.
https://www.youtube.com/watch?v=OBcikDXABpU

It has a Holset hx52 turbo, with billet compressor wheel. It will make boost from 2200rpm, and full boost 0.7 bar at 3000 rpm. In plan to move it up at 1.2 bar when track conditions will require it.
More from the project at https://www.facebook.com/3FunPerformance

stevieturbo

17,229 posts

246 months

Thursday 28th August 2014
quotequote all
viperash2003 said:
Heloo!
Take a look here.
Nissan 200sx s13, m70b50 , single turbo drift car.
https://www.youtube.com/watch?v=OBcikDXABpU

It has a Holset hx52 turbo, with billet compressor wheel. It will make boost from 2200rpm, and full boost 0.7 bar at 3000 rpm. In plan to move it up at 1.2 bar when track conditions will require it.
More from the project at https://www.facebook.com/3FunPerformance
Some pretty cool work there !!

jontysafe

2,351 posts

177 months

Tuesday 2nd September 2014
quotequote all
I would be interested to know what injectors and ecu you are going to use to control this setup?

It will make the turbo look cheap I should think !