Some first sights to turbo model / idea to improve maybe?

jtbo · Dec 3, 2012

As Tim suggested, I'm putting this from general section to here.

Since that I have done more of work and I have quite nicely working 2 turbo setup now. Reason for MAP dropping suddenly to 1.0 and turbo to suddenly changing rpm were probably my incorrect inputs, which might have caused some unpredicted conditions to happen, still even map did read 1.0 there was power added to engine, odd things, but with wrong numbers odd things can happen.

However that bottom part is perhaps something that I'm more curious about now.

I'm not sure if my doing or if engine's doing, but as I put T3-60 turbo on 4.2 litre 6 cylinder motor, I noticed it spool up to 130 000 rpm, tiny bit above, like 20 rpm or so, then all of sudden, like a snap, it went to 123xxx rpm and started decreasing rpm.

This was at very high rpm (well, for the motor, around 5000) and going past peak power so it is kind of excepted for turbo to decrease in rpm, but what I found odd was that it did do that in a snap, split second.

It can be fairly well that I had something wrong in my setup as I did made some changes to PR/Eff table this issue got lot less noticeable, but still happens sometimes, MAP decreases also like a snap and then quite fast falls down, but if I push clutch down and let enging hit rev limiter for moment and lift clutch back up (keeping throttle floored all the time), I get boost back to maximum.

Using 210 000 pressure setting, but default wastegate and dump settings from example, which might be part of the reason, I still need more time to fully understand how those values correlate to realworld counterparts, I have idea about them, but I need more testing until I can be sure of my idea.

Generally turbo system is really nicely done, very easy to use, intercooler, intake temps and surge effects are certainly something to look forward to

Bottom part

There is one thing I must ask however, but understandable if it can't be answered.

Current implementation increases engine power, which makes it bit difficult to match torque curve obtained from car dyno session. However my understanding is that turbo code returns multiplier to engine torque in realtime, if such is the case, then I would imagine it would be also possible to decrease power unless maximum effect from turbo is happening, kind of inverse multiplier, so at maximum you get 1, while when not at maximum you get less than 1, one would need to return percentage of turbo code effect instead of multiplier to achieve that I believe.

That would make working with turbos a lot easier, while having exact same effects, I believe. Would that be something worth to consider?
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Some first sights to turbo model / idea to improve maybe?

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