V6 Turbos are strange

[Burning Bridges]

For some time I have been operating near the limits of turbos and noticed that the power band of the V6 is weird, making them almost useless for high performance applications (track times)

inline 4s work great now, that must be said and have become my favorite choice. Which is great because turbocharged inline 4s have firm ground in reality.

Example: For an inline 4 or 6 the turbo begins to hit at ca 4000-4500 upm for a V6 that is 6000. I have tried a lot to make a good V6 Turbo (it would be ideal sized for many cars) so I know that it cannot get anywhere near the low end performance of any inline engine (even i3s are greatly superior btw and can power small cars to great results i.e. I could achieve 1:48s on the Automation track with 3 clyinder turbo)

I tested many V6s the track and even if I create the same performance index and even higher PWR the car with the V6 is 8-10 seconds slower, simply because the turbo lag is much too high.

I have not done much with V8s. The problem seems to be still there but a lot milder.

With V10s the powerband is back to the inline engines, and you can create very high power output from 4000 rpm. Sadly V10s are already overkill and mostly too large for track times, besides the fact that they don't -and should not- fit many cars.

So the question is if this is intended and based in reality (which I find strange as 80s F1 used V6 Turbos to great success) or if the game has retained an old set of variables for V6s, while the other engines have newer and more turbo friendly values. I say this because I still remember the times when ALLl turbos were useless in hotlapping, and this has changed (which is great because turbos are much more difficult and have become really interesting).

I can provide screenshots of the bands if someone wants to see them and if this helps.

[Killrob]

There are no special game mechanics regarding V6s or any other configuration. V6 turbos should behave exactly the same way as Inline 3 turbos do. That means that on average you will need a smaller turbo, which has slightly lower efficiency than larger turbos, maybe that is the difference you are seeing.

[Burning Bridges]

Thanks Killrob. The smaller compressor/turbine seems to really help.

I put in the turbo I am using for my i3s: compressor 62.0 turbine 40.0 - and indeed the good low end characteristics have returned.

My mistake was using the values from my i6 which are much much higher (up to compressor 85). I did not fully understand the implications that biturbo is two i3 turbos :)

6 cylinder V
https://steamcommunity.com/sharedfiles/filedetails/?id=1399845913
3 cylinder
https://steamcommunity.com/sharedfiles/filedetails/?id=1399845249

[Burning Bridges]

If I understand this correct a V8 Turbo would then also be a i4 with larger exhaust / intercooler and the usual minor changes? If that is the case I could make killer V8 turbos actually, as my i4s are already way over 0.5 performance index / kg

[Killrob]

Originally posted by Burning Bridges:

If I understand this correct a V8 Turbo would then also be a i4 with larger exhaust / intercooler and the usual minor changes? If that is the case I could make killer V8 turbos actually, as my i4s are already way over 0.5 performance index / kg

Yes, if you have a good setup for an I4, a V8 with double the capacity will do really well with the same setup but adjusted exhaust and intercooler size!

[Burning Bridges]

I built the V8 and it has almost 2000 hp from 6L but no chassis can really drive the weight and power (4-5 seconds slower).

But the V6 is doing great and brought my cars in 1:35s on the Automation track, it was really just a question of understanding that the V6 is closely related to the i3, all disadvantages have resolved and V6 is the king of turbo engines (narrowly before the i4)