I think I found some lost horsepower.
11-24-2009, 06:39 PM
#22
it may make a difference and if it does the gains would be so small that you will never be able to measure it. So therefore you will never know. In you head you might feel like it made a difference when it really didn't at all. Your mind will play tricks on you. So don't be fooled!
11-24-2009, 07:03 PM
#24
This is exactly what i was thinking too,but you beat me to it guy LOL I know only haveing 92% will mess with your auto trans function as i had a aftermarket Accufab TB that was only showing 90% no matter what i did because of the desighn i guess LOL Jerry Farmato, while tunning it last year pointed this out to me while he was trying to tune it and exsplained how the TPS signals actually controls shift points and clutch pressures in the auto trannys. We even tryed boreing out the TPS sensors mounting holes which still wasnt right
I ended up just putting on a ported stock TB and was good to go after that LOL He said i wasnt alone with this issue,about 7 out of 10 guys that he tunes for that run afternarket TB's all have this problem which cant be tunned out Just figuired ide share this while were on the TPS subject LOL
I ended up just putting on a ported stock TB and was good to go after that LOL He said i wasnt alone with this issue,about 7 out of 10 guys that he tunes for that run afternarket TB's all have this problem which cant be tunned out Just figuired ide share this while were on the TPS subject LOL
11-24-2009, 10:10 PM
#25
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If that's the case why would anyone on a N/A car go with a bigger throttle body if they already reach 0 vaccum since there isn't any restriction?
11-24-2009, 10:14 PM
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So if someone is running a smaller turbo that reaches boost very early in the rpm than they would only need as much throttle as required to maintain the level of boost?
These are actual questions that I'm curious about so don't take them as being abrasive.
These are actual questions that I'm curious about so don't take them as being abrasive.
11-25-2009, 06:20 AM
#27
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In n/a if the throttle is just big enough that it is causing zero restriction...how can a larger one possibly be of any benefit ?
it cant, the one in use doesnt post any restriction.
Size of turbo is totally irrelevant. If the openeing allows enough airflow past it for the engine to create xxx bhp, then thats all that matters. Using a larger TB only reduces control available under foot as resolution is much reduced.
it cant, the one in use doesnt post any restriction.
Size of turbo is totally irrelevant. If the openeing allows enough airflow past it for the engine to create xxx bhp, then thats all that matters. Using a larger TB only reduces control available under foot as resolution is much reduced.
11-25-2009, 07:06 AM
#28
11-25-2009, 08:36 AM
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maybe I'm missing something... but let's say you're pushing 10psi. Yes, at 90% throttle opening you have 10psi, and at 100% throttle opening you also have 10psi, but at 100% opening the VOLUME of air passing through the blades will be greater, thus allowing for more fuel yada yada. Or did I completely misinterpret my engine fundamentals class??
11-25-2009, 10:37 AM
#32
maybe I'm missing something... but let's say you're pushing 10psi. Yes, at 90% throttle opening you have 10psi, and at 100% throttle opening you also have 10psi, but at 100% opening the VOLUME of air passing through the blades will be greater, thus allowing for more fuel yada yada. Or did I completely misinterpret my engine fundamentals class??
11-25-2009, 11:02 AM
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So to actually measure gains you would need to measure flow (cfm or lbs/min) per the amount of restriction (boost)? So to make more horsepower you would either want to increase cfm of flow by either increasing boost or lowering restriction?
Thanks for all the answers.
Thanks for all the answers.
11-25-2009, 02:45 PM
#34
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you would need to figure out how much CFM of air your cubic inch engine consumes at a given rpm at a given boost pressure, and then see what your TB flows at varying angles by flowbenching it.. if the requirement exceeds the flow, you picked up power, if not you didn't. In the real world we aren't all thermodynamics engineers and have to find a lame CFM calculator which may or may not be correct on the net since I forget the formula off hand but can be found in "maximum boost" by corky bell... secondly who owns a flow bench lol. Just do it and hope it helps out, it may or may not but you really will never know for certain.
11-25-2009, 04:31 PM
#35
It would be easier to measure pressure upstream and downstream of the TB with it at 90% and 100% open.
