Is there a graph or something that shows what the heat would be at XXpsi?

Example:

(100* ambient) + (compressed at 5psi) = 150* intake air


I'm trying to determine what kind of intercooler that I will need to air/air or water/air.

Thanks,

Daniel

 

Temperature of the compressor outlet depends largely on the compressor's effeciency and the effeciency range you are operting the turbo in (think of compressor maps). I think McInnes Turbochargers book has some of those formulas.

 

You use the ideal gas law to figure out what the temp rise should be assuming that the compressor was 100% efficient, and then figure out the additional temp rise due to it’s actual efficiency. Make sure you do all the math in * R or you’ll get some really funky results.

 

I have an excel file that can do this for you (if you have excel on your computer). All of the calculations are taken from the "Turbochagers" book mentioned above. Go to the 'Turbo Size' tab, simply change the boost level in the shaded cell, and look at T-ideal in the lower list of values. This is the temperature rise due to compressing the air. The other values in the shaded cells can be changed also, but they don't contribute to the ideal temp rise so for this it doesn't matter what they say. Put in your estimated compressor efficiency and then the T-actual cell will become accurate, or just put in your whole combo for the full scoop:

http://www.egr.msu.edu/~remondi2/Car%20Calcs.xls

(note: all temps are required and given in *F to simplify things a little)

 

Thanks man.
I went to the book store trying to find that one, but Barnes & Noble didn't have it. I'm going to go to another one this weekend and try to find it. If not I will order it.

Thanks everyone.

 

If you think you'll use it, get it. It's a great book. Another real good one that has a bit of a different approach is "Maximum Boost" by Corky Bell I believe. Your not going to find either anywhere for cheaper than amazon.com, and they are pretty quick with their standard shipping too.

 

Thanks.

I'm loving the power adder board, people are much nicer here than in the TPI area.

 

Lol, I think once I get the LT1 runnin', I may be frequenting this board soon too. You gettin' a S'Charger Maroon?

 

I will be going with the twin turbo system. I have a really nice set of heads that would really like some extra air now.

http://www.bbsdesigns.net

You can see some pics when you get there.

 

Is there any reason why that setup won't work for an LT1 in a thirdgen? If the stock manifolds will fit on an LT1, there can't betoo much difference between the LT1 setup and the L98 can there??

 

The intake might be the only difference since it sits lower. You might need to customiize one.

 

Is there enough information in the ideal gas law to solve this
problem.? I would think that you would start
by assuming adiabatic compresssion, and using the ST diagram.
Or something like that, then adding more temp for compressor ineff.

 

When you try to do the math you’ll find that the most of the ideal gas law stuff cancels out and you’re good. As far as the spreadsheet… I believe that we’ve had this discussion before, it’s nicely laid out but I don’t believe the results it gives for this is correct. I haven’t posted about it because I wanted to try to figure out why I was getting different numbers then it was but I haven’t had the time to sit around and actually look at it, but I’m pretty sure that we’ve had a thread about this before.