Quote:
Originally Posted by mcrews
here are the factory specs on your car:
Engine & Performance
Base engine size: 1.7 L
Cam type: Single overhead cam (SOHC)
Cylinders: inline 4
Valves: 16
Torque: 110 ft-lbs. @ 4500 rpm
Horsepower: 115 hp @ 6100 rpm
Turning circle: 34.1 ft.
Base engine type: gas
DriveTrain
here is the basic chart:
Pipe Diameter (inches) .....Max HP Per Pipe ......Max HP For A Dual Pipe System
1 1/2 .................................78 ....................................155
1 5/8 ................................. 92 .......................................185
1 3/4 .................................108......................................... 217
2 .................................144 ...........................................289
2 1/4 ...............................185................ ......................... 371
2 1/2 ................................232............... ............................. 463
at 6k rpm, the BRAND NEW Civic made 115 hp. THat is an unsustainable rpm over more than 5-7 minutes on a used car.
given a 10 yr old car, the MAX hp is maybe 100.
I'm not sure what 'how you drives' means, but you are on an mpg thread , which implies low rpm.
factually, you need to be at 1 3/4 MAX and in reality, 1 5/8.
If you have a scangauge that is correctly calibrated, you can see the hp being produced at cruise.
What most people seem to do is think that the pipe should reflect the max horsepower of the engine, and that is incorrect. the pipe should reflect the hp that you use 70% of the time. Not the hp you use less than 5% of the time.
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Thanks for the info I did read that chart off of the max hp I have the ex which was 127 (thought it was 140 that must have been my old one), the way I drive is never over 2800 and definately never over 3000 rpm, I use the torque but not so much the hp, to keep speed is about the only reason I use hp, which I have teh ultragauge so I will have to keep an eye on it. Do you think the bottleneck in the exhaust is a problem though, or something not to worry about, I have been getting very good mileage with the good weather, since I got the ultragauge I have averaged about 42 mpg, which is a pretty good start for me, it was just weird to see the change in pipe sizing while I was hunting down that exhaust leak.