monoply6

hi all ive fitted my new exhaust replaced the two cats and put a 3 inc free flowing silencer from the y pipe which dumps by the diff my question is now when i plant the throtal theres hardly any tyre spin smoke is it possible the turq cure has moved up the reve range as im still getting o-60 time in 6sec it cant be down on power could it any ideas

'86 350

Wow.... I have no idea what the hell you said.

battman

iTrader: (2)

Translation:

Hello all, I have fitted my new exhaust and replaced the two cats with two 3 inch free flowing silencers from the y pipe which dumps by the differential. My question is now when I plant the throttle there is hardly any tire spin/smoke is it possible the torque curve has moved up in the RPM range because I’m still getting 0-60 time in 6 seconds. I hope I did not loose any power with this mod, any ideas.

ScottyRS

iTrader: (2)

Did you replace only the cats?

C&DPerformance

Sound like you killed the bottom end by putting to big of exhaust on it. If you only got 2 3" pipes that dump in front of the axle it's like running open headers.

monoply6

no i replaced the cats with same diameter pipes two and half inch then put a simmons silencer on the end of the y pipe with 3 inch inlet,outlet 24 inch long which ends just in front of the diff sorry my spelling is crap,so if i move the silencer to the back of the car and run 3 inch pipe to it would that make a difference i just love smokeing them tyres

ScottyRS

iTrader: (2)

Well eliminating the cats alone isn't going to make much of a difference in performance. And I'm not sure what a "silencer" is but it sounds a lot like a muffler. And if it is, moving it back won't make much difference, if any.

monoply6

sorry yes a silencer is a muffler

one wheel peel

well just pull of the silencer and see if your back to tire smokin again,id just run it with cats only, sound good to me,i mean if you gotta run the cats lol

stroker_SS

I think he said he got rid of the cats already, so he would have to put them back on if he wanted to run just cats.

monoply6

we have to have at least one muffler on are cars here not including cats and it has to finish past the back of the door and we dont have to have cats or any emmisions equip on cars made before aug 1992

stroker_SS

What engine do you have, and is it in good tune, make sure you didn't bump any sensors(o2) and break the wires. I doubt your exhaust would have much to do with the power"loss". And if you still want to burn tires and all else fails just put your old exhaust on.

monoply6

ita a 5.7 tpi had new 02 sensor only code now is 36 maf burn of relay stuffed put old system back on last night to see if any difference there is it smokes the tyres better,now could it be some thing to do with back presure i only ask this cause some tuners over her think that autos need some back presure for first gear pull off or some think like that

stroker_SS

Back pressure to pull off first gear? Tons of drag racers use autos with open headers. I guess you could do some chip burning to care of the no tire smoke problem with the new exhaust and take advantage of your new free flow exhuast, or if you like burning the tires that much, just leave on the old system.

86 Tranni

what type of exhuast did you get?

monoply6

dont have a specific system all i did was replace the 2 cats with pipes and put a simmons free flow muffler on witch is a 4 inc round with 3 inc inlet outlet it was for a twin turbo v6 granada that was rated at 400 hp