nczimmerman2
Registered User
I made an interesting discovery this weekend, found that the cats on my 1995 SC had been hollowed and welded back together and were leaking. So I put on a set of 1989's I had at the house (after modifying the passenger side to fit). Low and behold the bottom end power jumped a bunch (seat of the pants Dyno 2000). The engine is as follows standard crank, ..030 pistons, total seal rings, comp cam 210/220-.498, LT-1 pushrods, new plugs and Ford wires, Felpro all the way, ported late model supercharger, heads and intake, 1993 blower pulley. The car is a five speed and has the motor I just built this fall swapped in. I still hate the bottled up exhaust and want to improve the flow, but not a the expense of the low end grunt. What success have any of you had with maybe a 2.25" catted exhaust to keep the velocity high, VS the 2.5" exhaust that seems to be so popular? Or will the addition of the cats on a 2.5" system give back the low end. Previously it was Ho-Hum to drive til it got to about 2,800 rpm then it was a bat out of....well you get the idea. The way it is now the car will break the tires (Goodyear 235/55's) loose and fishtail through first from a rolling start. Second gear is also very exciting from about 2,500 to 5,000 rpm. Boost did not seem to change from previous, it is 12 psi then slips to 9 or 10. (Maybe the belt). Thanks