Toyota MR2 Message Board - View Single Post - 4A-GE MK1 Engine new to mr N/A, i swear, this car is faster than it should be..

curvesrgood · 03-22-2008, 06:23 PM

Please explain why these glass pack to stock exhaust causing the smoother power band (I've heard others say similar things when changing exhausts on mk1 n/a cars, that they gained some butt dyno power going back stock from some... not all... crazy rediculous high flow exhausts)? Is the factory tuning that spot on that the computer is confused with too much airflow? Or do people just not do the obvious combinations of a functional conical short filter or a true cold air intake setup when they've done these exhaust swaps? I had read somewhere online that these things needed some backpressure, suppose that site had poor information as seems common with these motors. The 85 with a trd header, and supertrap muffler (no cat of course) and adjusted timing was rediculous fast I drove last week... that muffler did nothing whatsoever on that car other than perhaps amplify the sound a bit... that car had no real backpressure and clearly needed none. My bad, I'll stick to 4ag info from trusted sites from now on, lol.

03-22-2008, 06:23 PM	#31 (permalink)
curvesrgood three mk1's Join Date: Feb 2006 Location: NC Posts: 499 Thanks: 8 Thanked 33 Times in 28 Posts iTrader Rating: (1/100% )	Please explain why these glass pack to stock exhaust causing the smoother power band (I've heard others say similar things when changing exhausts on mk1 n/a cars, that they gained some butt dyno power going back stock from some... not all... crazy rediculous high flow exhausts)? Is the factory tuning that spot on that the computer is confused with too much airflow? Or do people just not do the obvious combinations of a functional conical short filter or a true cold air intake setup when they've done these exhaust swaps? I had read somewhere online that these things needed some backpressure, suppose that site had poor information as seems common with these motors. The 85 with a trd header, and supertrap muffler (no cat of course) and adjusted timing was rediculous fast I drove last week... that muffler did nothing whatsoever on that car other than perhaps amplify the sound a bit... that car had no real backpressure and clearly needed none. My bad, I'll stick to 4ag info from trusted sites from now on, lol.