i originally had my car dynoed a moth ago and it put down 236hp and 280ftlbs stock with the only alteration being a removed silencer. i put on a flowmaster a/t catback and mrt catted h pipe 2 weeks ago and went and had it dynoed last friday and put down 244hp and 289ft lbs. gain of 8hp and 9 ft lbs at peaks, up to 12 under the curve. heres my question, how much woud a/f ratio affect power, i was expecting a little more that 8 hp from an h pipe and catback. i didnt get a a/f on either dyno so i have nothing to compare, but how much of a power difference would there be from going from an af ratio of say 13:1 to 12:1? secondly i lost some gas mileage after the install, probably about 20 miles to a full tank with the same driving, how long would it take the comp to relearn the correct a/f or will it ever? do you guys think that the higher flow of this combination could richen it up that much?
a/f vs new dyno#'s
- Thread starter 93cobraxx
- Start date
Lean
Lean is mean. When you start to get into the 12.5 range your running too rich for a stock car.
Lean is mean , but you create heat. On a stock car( or minor bolt ons) you want to go leaner. If you are running a power adder(nitrous or blower) you run the car a little richer(more fuel) to keep the heat down in the cylinder. 12.1 might be ok for a blown car but is too rich for bolt ons and would make the car run slower.
When I dynoed my car(mustang dyno, with a load) with nitrous it ran great at 12.2 and higher(leaner). When I got below 12.1 (rich)the car started to blow black smoke and lost power.
93cobraxx said:
Lean is mean. When you start to get into the 12.5 range your running too rich for a stock car.
Lean is mean , but you create heat. On a stock car( or minor bolt ons) you want to go leaner. If you are running a power adder(nitrous or blower) you run the car a little richer(more fuel) to keep the heat down in the cylinder. 12.1 might be ok for a blown car but is too rich for bolt ons and would make the car run slower.
When I dynoed my car(mustang dyno, with a load) with nitrous it ran great at 12.2 and higher(leaner). When I got below 12.1 (rich)the car started to blow black smoke and lost power.
