eddieleephd
Top Post Dawg
Hey y'all, just had a 2.5" straight pipe from the cat back installed and did a little logging to compare before actual to after actual effects of the change.
The change was to remove the OEM resonator and muffler and replace it with a 2.5" straight pipe, Sounds mean and a little loud for my preference, however, the turbo doesn't whine out loud that I notice within the car.
As mentioned by others, the exhaust change doesn't affect the power much alone and these logs show that the spooling is improved which is the true benefit to having a low resistance exhaust.
Before I had adjusted it so that it would spool about 100mbar over in 3rd, without adjustment that number went up to 187mbar over in 3rd. 187/69=2.21psi compared to before 100/69=1.44 so the increase was about .8psi in third.
I have only run a couple logs so far, so, more logging is in the near future to review actual and decide if I should adjust it out a bit more.
I have an 02 1.8t auto wagon swapped to an ALH manual with a Malone stage 4 tune, 11mm ip, vnt17, egr delete, bmw cyclonic pcv filter, 3bar map, sbc stage2 DD, single mass flywheel, IQ around 3.
3rd - 5th before
https://log.malonetuning.com/chart/240555#H8KLCADDisOQw5FbAgNNwovDkQrCgzAMAMO%2FJcOPDcOow7BvSh%2FDqgw1w5A1wpLDhsOhw7bDtcOaCmPCj3fDh3kPT3nDjVwIwpPDisK%2BVXBDcE1mUcO%2Bw5LChQ4SFcOSaAR3KW9SQxM8MB7DnMKOw7vCicOLwoLCn8KfAsOlwrRaXyrDmV%2FDsMKPw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA%3D%3D
3rd 4th before
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
3rd - 5th after no adjustments
https://log.malonetuning.com/chart/...Pw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA==
3rd 4th after
https://log.malonetuning.com/chart/...Pw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA==
Edit one for addition of information.
Today I did a log with new injectors, with only a software IQ adjustment to knock down smoke, which are Wuzetem p502J from Frans at Dutch auto and man the smoke that is jumping out behind me.
Not quite rolling coal, but yeah I see it pretty well in the rear-view mirrors.
This is pretty much immediately after then turnaround and do it again logs, both are third to red-line and fourth to near 100mph:
and 322,400 mi on odometer.
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
new logs different tune and hammer mod
https://log.malonetuning.com/chart/246944
https://log.malonetuning.com/chart/246945
https://log.malonetuning.com/chart/246946
The change was to remove the OEM resonator and muffler and replace it with a 2.5" straight pipe, Sounds mean and a little loud for my preference, however, the turbo doesn't whine out loud that I notice within the car.
As mentioned by others, the exhaust change doesn't affect the power much alone and these logs show that the spooling is improved which is the true benefit to having a low resistance exhaust.
Before I had adjusted it so that it would spool about 100mbar over in 3rd, without adjustment that number went up to 187mbar over in 3rd. 187/69=2.21psi compared to before 100/69=1.44 so the increase was about .8psi in third.
I have only run a couple logs so far, so, more logging is in the near future to review actual and decide if I should adjust it out a bit more.
I have an 02 1.8t auto wagon swapped to an ALH manual with a Malone stage 4 tune, 11mm ip, vnt17, egr delete, bmw cyclonic pcv filter, 3bar map, sbc stage2 DD, single mass flywheel, IQ around 3.
3rd - 5th before
https://log.malonetuning.com/chart/240555#H8KLCADDisOQw5FbAgNNwovDkQrCgzAMAMO%2FJcOPDcOow7BvSh%2FDqgw1w5A1wpLDhsOhw7bDtcOaCmPCj3fDh3kPT3nDjVwIwpPDisK%2BVXBDcE1mUcO%2Bw5LChQ4SFcOSaAR3KW9SQxM8MB7DnMKOw7vCicOLwoLCn8KfAsOlwrRaXyrDmV%2FDsMKPw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA%3D%3D
3rd 4th before
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
3rd - 5th after no adjustments
https://log.malonetuning.com/chart/...Pw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA==
3rd 4th after
https://log.malonetuning.com/chart/...Pw6Bgw6whw64mdcOLbMONwo9TCCfCtzzDpifCjwAAAA==
Edit one for addition of information.
Today I did a log with new injectors, with only a software IQ adjustment to knock down smoke, which are Wuzetem p502J from Frans at Dutch auto and man the smoke that is jumping out behind me.
Not quite rolling coal, but yeah I see it pretty well in the rear-view mirrors.
This is pretty much immediately after then turnaround and do it again logs, both are third to red-line and fourth to near 100mph:
and 322,400 mi on odometer.
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
https://log.malonetuning.com/chart/...wwo/DoGDDrCHDriZ1w4tsw43Cj1MIJ8K3PMOmJ8KPAAAA
new logs different tune and hammer mod
https://log.malonetuning.com/chart/246944
https://log.malonetuning.com/chart/246945
https://log.malonetuning.com/chart/246946
Last edited: