does compressor side affect spool at all?
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does compressor side affect spool at all? Say you have three different turbos
80mm,88mm and 94mm, but the turbine side is exactly the same. Would spool be effectively the same between the three turbos?
80mm,88mm and 94mm, but the turbine side is exactly the same. Would spool be effectively the same between the three turbos?
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From my experience, the cold side does have less of an effect than the hot side. On my current vehicle, I've run 3 different turbos. A T60 and a T70 which were both P trims on the turbine, and a TC76 which is an F1 on the turbine side. There seemed to be less of a difference between the T60 and the T70 than the T70 and the TC76.
Keep in mind I have no boost/dyno graphs to back this up, this is just my experience on my vehicle. Your mileage may very.
What is your specific application? Or are you just wondering in general?
Keep in mind I have no boost/dyno graphs to back this up, this is just my experience on my vehicle. Your mileage may very.
What is your specific application? Or are you just wondering in general?
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Its a fairly simple really.
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also, just thinking out loud here - apart from the weight of the compressor side itself, doesnt the compressor impart a load on the turbo by trying to move all that air, so wouldnt it stand to reason that a compressor that moves more air with its bigger blades would also put more of a load on the exhaust side, resulting in slower boost?
again, just thinking out loud
again, just thinking out loud
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also, just thinking out loud here - apart from the weight of the compressor side itself, doesnt the compressor impart a load on the turbo by trying to move all that air, so wouldnt it stand to reason that a compressor that moves more air with its bigger blades would also put more of a load on the exhaust side, resulting in slower boost?
again, just thinking out loud
again, just thinking out loud
why does the PT88 t4 spools faster than a GT47-88mm t6????? both turbos use 88mm compressors??
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bigger compressors are capable of putting more load on the turbine because they could flow more than a smaller compressor. Spin the bigger compressor to flow like a smaller compressor, will require the nearly same amount of load on the same turbine.
why does the PT88 t4 spools faster than a GT47-88mm t6????? both turbos use 88mm compressors??
why does the PT88 t4 spools faster than a GT47-88mm t6????? both turbos use 88mm compressors??
interesting reading on this. dont know if this is science or bullshiz but its interesting
http://hondaswap.com/general-tech-ma...ulator-174676/
We are really splitting hairs at this point. I think we all agree that turbine side effects spool more than the compressor side, but the compressor side still will have an effect.
Think of it this way as well. For every rotation of the turbine wheel, it still has to turn whatever is on the other side.
Think of it this way as well. For every rotation of the turbine wheel, it still has to turn whatever is on the other side.
the t4 pt-88 spools different than the gt47-88, and the only thing thats different is the shapes of the wheels and housings *to my knowledge.
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as an update, the compressor side definitely had an effect on the spool.
twin t70s on a 4.8 , 3400 rpms to positive territory
twin t60s on a 4.8 ,3050 rpms to positive territory.
NOTHING else was changed
twin t70s on a 4.8 , 3400 rpms to positive territory
twin t60s on a 4.8 ,3050 rpms to positive territory.
NOTHING else was changed
I'm just curious. Could you be more specific on what were these results from? like what tranny, turbine wheel and turbine housing a/r?
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also, just thinking out loud here - apart from the weight of the compressor side itself, doesnt the compressor impart a load on the turbo by trying to move all that air, so wouldnt it stand to reason that a compressor that moves more air with its bigger blades would also put more of a load on the exhaust side, resulting in slower boost?
again, just thinking out loud
again, just thinking out loud