john,
I could also go to other car sites and read about how wonderful their CIA induction or oiled air filter or XXXXXX or YYYYYYYYY gives better mileage or bettter response or better ZZZZZZZZZ
OR
I could stay here and look for ABA testing and documents.
oh life is full of easier choices!!!!!!!
If we follow your logic, then that crown vic had over 400hp.........
you said
"In all honesty, I think removing restrictions to the exhaust and intake tract are probably where most of the people on this forum are missing out on gains. Not a shot at anyone in particular, but if you've spent 100 hours on coroplast aero experiments and you still have a stock 1 1/2 inch tailpipe on, you're really going about this game the hard way."
you comment is reflective of your 'tendancy' to exagerate. "100 hours"....
....
maybe.....you should spend 10 minutes using the search function. try aba testing first.
How To Calculate Muffler Size and Exhaust Pipe Diameter | Exhaust Videos
"Easy Way To Estimate: Your intake system needs to flow 1.5 CFM per engine horsepower, and your exhaust system needs to flow 2.2 CFM per engine horsepower.
Good Way To Estimate: Take engine RPM x engine displacement, then divide by two. This is the intake volume. Use this same volume of air for the exhaust system, but then correct for thermal expansion (you need to know exhaust temps to figure things out).
Exhaust Pipe Size Estimate: A good section of straight pipe will flow about 115 CFM per square inch of area. Here’s a quick table that shows how many CFM each common pipe size will flow, as well as the estimated max horsepower for each pipe size:
Pipe Dia. (inches).....Total CFM (est.)....Max HP/ Pipe........ Max HP For Dual System
1 1/2 .......................171.................... 78........................... 155
1 5/8 .......................203 ....................92 ..........................185
1 3/4 .......................239 ...................108 .........................217
2 ............................ 318 ...................144 ........................289
2 1/4........................ 408 ...................185 ........................371
2 1/2 ........................ 509 ...................232 ......................463
2 3/4 .........................622 ...................283....................... 566
3.............................. 747 ....................339...................... 679
3 1/4........................ 882................... 401 ........................802
3 1/2.........................1029 ..................468 ......................935
NOTE: These numbers are just estimates. All pipes are assumed to be 16 gauge steel.
The table above is probably over-estimating pipe size, but you can see that a 400 hp vehicle with a dual exhaust system only needs 2 1/4 – 2 1/2 inch pipes. Anything larger is overkill.
you do understand that this chart is refering to hp at wot?
so if you REALLY understand eco-driving, you understand that we arent at wot.
So why do we need larger exhaust?
But that is a retorical question...I don't want another post about 'how you feel'. do some research and proof what you have to say.(and not with references to what others 'say'. PROOF. tested proof.
