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Hybrid Turbo options and comparisons
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01-11-2016, 03:38 AM | #67 | |
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If they know that it would not last everything that compressor map promises, why in earth do they puplish it ? I do not blame the turbo itself, but the people back there. If I only knew this, I would try a bigger one. From every advertisemen I read, that this is the very right turbo to at least 500hp ... |
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01-11-2016, 05:54 AM | #68 | |
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01-11-2016, 06:54 AM | #69 | |
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When you say "all" these hybrids, you mean that we have talked about so far, right? |
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01-11-2016, 07:22 AM | #70 | ||
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01-11-2016, 07:33 AM | #71 | |
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It does not give any positive change. Originally K26 in bmw Comp inducer 50mm, ex 71mm turbine ex 55mm, I donīt remember the other measure now. In my turbo Compressor wheel is still that 71mm, with extended tip. Inducer is ~55mm to get more flow. But about the changes to hot side, I donīt tell anything. It was so hard to find the suitable parts, that I let the other do their homework just by themself. No sense to do anything to compressor, until you get some real benefit to hot side. Only thing that gives a "reason" to mod compressor side. |
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01-11-2016, 07:38 AM | #72 | ||
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01-11-2016, 12:05 PM | #73 |
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Yes If you have to port the WG in stock turbo, even that shows that there is some kind of problem in hot side gas flow. Compressor is too efficient. There are no room for bigger compressor until something positive happens in the hot side. The "big turbo tuners" just donīt care. There are even two possibilities to turbine and the other one can be find quite easily in fact, not more than hour or two ... |
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01-11-2016, 06:02 PM | #76 |
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The point of porting the WG is not to make more power its to allow the computer to actually control boost level. Of course youre going to see a power loss if you take boost out assuming the fuel was there for it. You are a lot less likely to blow turbo parts all over in your engine though. On the opposite side of that, if you wanted to make the same power you still could, it would just require turning up the boost to the level it was reaching before porting.
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01-11-2016, 06:03 PM | #77 |
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The porting is done to compliment a tune and/or open exhaust (w/tune) to help the turbo from overspooling. I am assuming BPC's customer is getting this and Bob just posted to show the differences from the porting alone. Not sure why this information would stop you from doing it.....
EDIT: Looks like Hoooper beat me to it Last edited by iaknown; 01-11-2016 at 06:11 PM.. |
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01-11-2016, 06:57 PM | #78 | |
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Besides the fact we are way off the compressor map. There has been more than a couple stories of cars in Europe blowing turbos on these cars from open exhaust and overspooling. But of course this would depend on what the limits are set to. My opinion is its good insurance for something that the dde can adapt the wastegate to in order to maintain the proper boost. Isn't NC335D's car running like 40 psi? I am assuming his turbos have clipping, etc. to help prevent this issue anyway. |
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01-11-2016, 07:20 PM | #79 | |
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From what I understand this was the problem with the 335D's that had blown turbos, tuner removed all triggers/limits/protection for overboost and it was just a matter of time. Not saying that's what you guys are doing but other tuners in Europe are.... Last edited by iaknown; 01-11-2016 at 07:25 PM.. |
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01-11-2016, 07:40 PM | #80 | |
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01-11-2016, 08:38 PM | #81 |
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Bob, just looking at your graph again, what is the double blue line on the topend?
Also, not quite sure why it loses so much boost right when the turbos switch, the wastegate isn't involved until much higher in the rpm's, at least not on my car. Is this a tuned car? |
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01-11-2016, 10:25 PM | #82 | |
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Also, why is the green higher when the wastegate shouldn't be actuated? Hypothetically, if it was the flap I suppose you could tune the switch at a different rate to help with the spike? That possible? Last edited by iaknown; 01-11-2016 at 10:42 PM.. |
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01-11-2016, 11:13 PM | #83 | |
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I sign this This test above is made from "half" power, no need or no sense to do anything to WG. Clearly you do not know now nothing about this feature. Shortly: First you do a fault to system, then you donīt fix it, and till the end you proves that it is not working properly. If you want to have power, you needs to have more air also. Till the end, the amount of air defines the amount of power. In orig system, there is no other way to get more air trough the engine but more boost, no other way. If you want to have ++400hp from these engines with orig turboīs at least 36psi is required, that is a fact, 40psi is even better level and 44psi is tested also, works. My opinion is that, the most of the turbos breaks because of really bad program. Lots of smoke, big heat sress. Never ever had any such difficulties, that turbos did not last. The situation, when orig WG cannot handle the boost, comes only in +400hp cars in long term stress, means long time full throttle and speed +200km/h. Not in any other situation and certainly not in dyno with very low power. |
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01-12-2016, 08:05 AM | #84 | |
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For those of you with hybrids, what kind of drive to boost pressure ratio's and psi's are you seeing at 4600 rpm?
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01-12-2016, 08:13 AM | #85 | ||
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01-12-2016, 08:36 AM | #86 |
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~60psi These engines are sheduled so that back pressure is practically all the time at least 15psi higher than boost pressure. Recirculation needs that pressure difference to work. So 15-20psi higher back pressure is still ok. Now I am using 44psi And if with org turbos wants to go up to ~420hp level, at least 36psi is needed. I think that ~50psi back pressure is still in very safety area, too low in fact. |
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01-12-2016, 09:01 AM | #87 | |
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Is it possible that the dip you were seeing was from a faulty boost solenoid that was leaking? Not holding the WG closed. Its weird cause a few of the dyno graphs from Europe ive seen, and maybe even jereks, show there peak torque is right around were BPC is seeing the dip...If I recall correctly. Not at all trying to point fingers, or put down BPC btw. I am a happy BPC customer. Just interesting results they are getting and makes me scratch my head and wonder what is going on. |
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01-12-2016, 09:06 AM | #88 |
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Wow. That's higher than I expected.
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