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Having less restriction in your intake is not the only thing that affects power. It's also important to have laminar (smooth) flow for as long as possible until the fuel is mixed in. Having nothing before the throttle body probably causes the flow to be more turbulent. Turbulence is a form of restriction. It causes more pressure drop which means less flow. Thats why a polished manifold makes more power. Another point to consider is that the air at the throttle body is likely to be significantly warmer than the air by the intake, especially if the hood is closed.
I'd guess that the temperature difference is the main culprit of no power gain with turbulent flow making a smaller but significant contribution.
For all you experts out there who don't have the benefit of an education in fluid mechanics you will find that if you compute the Reynolds number for the air bridge and throttle body, the flow is fully turbulent at any WOT setting much above idle speed.
For all you experts out there who don't have the benefit of an education in fluid mechanics you will find that if you compute the Reynolds number for the air bridge and throttle body, the flow is fully turbulent at any WOT setting much above idle speed.
Duke
You need to rethink your density number in that calculation.
We do try to keep the cars at a consistent temp when running on the dyno. When we test our cars we run 3 runs stock let her cool 20 min, run 3 more with mods let her cool 20 min, go back to stock for 3 more then another 20min then back to mods. As for the power gains we not only did them on the dyno but backed them up at the track. We did gain about 5 to 6 tenths on an auto car with our Airbox and Headers. That gain was with only 3 mods, Vortex Ram Induction, BPP long tube step headers and our X-pipe. As you see we do not just sit back and give you dyno numbers we are the only manufacture that not only attends Corvette race events but also participate. If our systems did not perform we would not be there. When we go to the shows that have drag events we install our products onsite and guarantee a performance gain or we will replace it back to stock. In the years of doing business we have called out other manufactures to do the same but got no response.
Our customers are our best salesmen. All who have had the Vortex Ram Induction have been pleased with its performance gains of 2 to 4 tenths. We also stand behind them that if you do not feel a seat in the pants gain we will refund your money.
The Vortex Ram Induction System is the first ram induction for the C6.
We plan on going to the track again next Wed if anyone would like to come watch. As for all the products we manufacture the Vortex Ram Induction is the biggest bang for the buck.
Almost agree with most, a little iffy on the polish thing. When you have a polished surface you actually increase the surface resistance over a ruff finish do to no air pocket to form a surface. The temp thing is beat to death. I measured the temp under the hood and outside with a digital thermometer while driving, 78 degrees outside 80 degrees inside the hood at 50 mph. I always get in trouble on this forum when I raise these issues especially with headers. Someone is claiming a 44 ftlb increase with what I called and got creamed on a boogus base line that wasn't tested for repeatability.
i saw the same thing with my C-5 less than 5 degrees difference between outside air and under the hood air at speed. the formula for HP vs air temp, for every 10 degrees you lower the inlet temp you gain 1% in HP.
I beg to differ on the temp issue.Next time hook up an autotap or tech 2 and look at the IAT sensor for the temp differance. Much greater then 5 to 10.
I beg to differ on the temp issue.Next time hook up an autotap or tech 2 and look at the IAT sensor for the temp differance. Much greater then 5 to 10.
you are seening the cooling effect of the air rushing past the thermistor not the true air temp. you have to check the air temp just OUTSIDE the air filter.that is the true air temp entering the engine
the computer allows for this cooling factor. anytime air is pulled thru a restriction it is cooled until it expands again that is why you have icing in carbs venturies if there is no heat added and that is why there is hot water to the TB on the vette. the A/C in your corvette works the same way, the gas,freon 134 is passed thru a restriction that causes it to lower it temp.
I beg to differ on the temp issue.Next time hook up an autotap or tech 2 and look at the IAT sensor for the temp differance. Much greater then 5 to 10.
You need to re-think what you just said. To repeat, one thermometer picup was along side the filter and other at the grill. So your telling me that just because the hood is closed some magic appears and the sensor makes it hotter???????
the computer allows for this cooling factor. anytime air is pulled thru a restriction it is cooled until it expands again that is why you have icing in carbs venturies if there is no heat added and that is why there is hot water to the TB on the vette. the A/C in your corvette works the same way, the gas,freon 134 is passed thru a restriction that causes it to lower it temp.
The freon is compressed - this creates heat, the heat is removed by passing air over the condensor, restoring the freon to ambient - it then is allowed to expand in the evaporator, cooling the evaporator and returning to the original pressure. You are thinking about an open system, which the A/C system is not - it is closed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
It seems, that if your going a good speed that the temps would not be too much different, but at the drags your sucking hot air for 3/4 of the track without a true CAI.
Larry