I have previously tested the turbo muffler delete a couple of different ways without finding any performance benefit. I figured I’ve adequately buried the question of whether or not it makes a difference.
The darn question keeps coming back with people proclaiming it improves performance.
I came across this comment from a fellow enthusiast claiming that a turbo muffler delete helps improve spool time.
Hallelujah, they provided a link to the information source that they were relying upon.
Taking a read-through of the article they referenced there were a couple of glaring errors in the article. This one is a real gem:
A turbo is a device that compresses incoming air into a high pressure air ball and sends it to the combustion chamber.Car Performance Boss
Also, there was an absence of any evidence but an abundance of inline advertising – not good signs that this source is credible.
The claim made by the author of the article at Car Performance Boss that the turbo muffler delete improves spool time lacks any foundation in fact.
Although I have thoroughly tested the TMD on the flow bench and have not found any difference between stock and aftermarket, and measuring power differences on the vehicle has corroborated the flow bench data showing no change, I have not specifically compared “spool times“.
Data Analysis Approach:
I have data from both the stock turbo muffler and aftermarket TMDs from using them on my GTI, so I decided to see how the spool times compare.
The stock GTI turbo muffler is being compared with the aFe Performance aftermarket TMD.
Data of interest is the time, measured in seconds, that it takes for boost pressure to build from 1 psi to 20 psi. This time is plotted against the engine speed when 1 psi is reached. At higher engine speeds the airflow volume through the engine is greater, and this generates more exhaust, which helps spool up the turbocharger more quickly, so it is important to show the spool time accounting for the engine speed.
The results of the comparison are shown on the chart:
There is no significant difference between the “spool time” of a stock turbo muffler and the aftermarket turbo muffler delete.
This result is consistent with previous tests that showed no differences in airflow or power output between a stock turbo muffler and an aftermarket turbo muffler delete.
Despite an abundance of evidence showing that turbo muffler deletes do not improve the performance of the Mk7 GTI, when businesses like Excelerate Performance baselessly claim they do make a difference, it’s not surprising that some consumers will believe them.