tri-y headers and smaller exhaust system
Posted: Tue Apr 09, 2019 5:09 am
i am going to fit and test a off shelf tri-y 1 5/8 headers.these are made locally here in Australia
from Summit i received today 2 x flowmaster merge pipes,2 x venturi pipes,2 x kooks mufflers this will be 2 1/2 system.
i am going to leave the system un-welded so i can change collector lengths etc.
if i have the room i will fit a header plate so i can try and match the exhaust flange to header ports this will be tricky i think,if not i will try and get the roof,sides as close as possible and make the floor as a anti reversion barrier.
on my car at the moment i have 4 into 1 --1 3/4 headers,short collector,3 inch system to aero chamber mufflers,i made this system a few years ago when my car had the 215 dart heads,roller cam etc,ran 11.0s @ 120 plus.
this year i have been running my 383 - 10.5:1 short block with my dart 165cc heads out to 178cc and small SFT comp cam 235-242 @ 0.050'' 106 lsa .500'' lift,air gap intake.
at the moment the car runs 11.7s @ 113mph. 1.61 - 60ft. 7.4s @ 91 mph in the 1/8th.
i think 11.5s are doable with more tuning,the engine falls on its face @ 6000rpm due to intake port choke CSA.i done this on purpose to test and learn for myself on the track with time slips.
i think the smaller exhaust will help making more torque,looking for everyone's ideas so feel free to comment
from Summit i received today 2 x flowmaster merge pipes,2 x venturi pipes,2 x kooks mufflers this will be 2 1/2 system.
i am going to leave the system un-welded so i can change collector lengths etc.
if i have the room i will fit a header plate so i can try and match the exhaust flange to header ports this will be tricky i think,if not i will try and get the roof,sides as close as possible and make the floor as a anti reversion barrier.
on my car at the moment i have 4 into 1 --1 3/4 headers,short collector,3 inch system to aero chamber mufflers,i made this system a few years ago when my car had the 215 dart heads,roller cam etc,ran 11.0s @ 120 plus.
this year i have been running my 383 - 10.5:1 short block with my dart 165cc heads out to 178cc and small SFT comp cam 235-242 @ 0.050'' 106 lsa .500'' lift,air gap intake.
at the moment the car runs 11.7s @ 113mph. 1.61 - 60ft. 7.4s @ 91 mph in the 1/8th.
i think 11.5s are doable with more tuning,the engine falls on its face @ 6000rpm due to intake port choke CSA.i done this on purpose to test and learn for myself on the track with time slips.
i think the smaller exhaust will help making more torque,looking for everyone's ideas so feel free to comment