s50 turbo

[WARLOCKM42]

Hi people has anyone turboed an s50 3.2 engine? Is it a pain in the ass? Compression ratio is 11.3 should it be changed?I can use all the intel please be generous!!! Many thanks.

[Gunni]

it should depending on issues,
The S50 is nothing to play with on easy terms.

Power goals?
Without them no answers can be given

[maxfield]

Also, a budget would help.

[WARLOCKM42]

Ok first i have to tell you its a 96 model OBDII. looking forward to 450HP (321HP now) Lets try to keep the budget around 5000GBP. A complete turbo kit would be great.I think compression ratio should be lowered to achieve this horsepower. An other think is that i need the engine to be reliable .I know its a lot to ask since this is a relatevely difficult engine to tune because of the intake manifold and the engine management but everything can be done if you have money time and knowledge!!!!(budget is not a problem bur since you asked i throwed a number...)MANY THANKS IN ADVANCE

[oldroydsr4]

450bhp can be achieved with an m20 with the right turbo kit and components for not much motre than 5k.

[Gunni]

450hp can be done on stock compression, but turbo needs to be selected real well and timing most definitly
needs to be pulled back, if you don´t have access to a proper vanos standalone or the oem software,
it´s going to be real hard to make things work well and reliably.

Vanos and turbo should not be dissed as it makes the whole turbo system work even better then possible with a non vanos engine along with even better high end.

[Demlotcrew]

Vanos and turbo should not be dissed as it makes the whole turbo system work even better then possible with a non vanos engine along with even better high end.

How did you work that one out? Vanos changes overlap nothing else, so if you are saying that advancing the exhaust cam to help build more boost as less air escapes during the cycle produces more top end?

Or does the vanos help to spool the turbo low end?

[reggid]

Vanos and turbo should not be dissed as it makes the whole turbo system work even better then possible with a non vanos engine along with even better high end.

How did you work that one out? Vanos changes overlap nothing else, so if you are saying that advancing the exhaust cam to help build more boost as less air escapes during the cycle produces more top end?

Or does the vanos help to spool the turbo low end?

probably allows more retard in the intake valves while while minimising overlap by advancing exhaust since both the intake and exhaust timing can be controlled individually.

[Demlotcrew]

Yeah youre right they can, but not a lot as there are physical restraints.

The inlet would need to stay open longer to let more air enter the chamber (as this is what makes the power not boost) but the exhaust cam timing also needs to be optimised to ensure that there is no air thats being let out through the exhaust valves during the cycle, on a NA engine without Vanos changing the timing results in the movement of the power band (up/down) in the rev range, BMW seen this is an advantage as a result you can use vanos to produce lots of low end torque and top end bhp without compromising on each other.

Im just trying to work out in my head how a turbo would work well with a Vanos as clearly there are advantages with having vanos on a NA engine.

Andrew

[Gunni]

Well if you look at the dyno graph of a vanos car vs a non vanos car with same top end,
the vanos engine has a stronger low end, it´s the low rpm airflow that will spool up the turbo.
it´s just that simple.

turbine section needs specific lbs of airflow to get spooling the shaft wich again turns the compressor wheel wich makes
boost, at lower rpm´s vanos engines are pushing out more lbs of air into the exhaust then without.

I´m not talking about after boost but before boost to get the turbo to make boost, also it will allow you to run a larger turbine section for higher effeciency at high rpm power, wich will again make even more power then a smaller section. In the end the powerband will get a huge jump as soon as the cam comes on, wich is sooner in a vanos car.