Miscellaneous Tests & Stuff

Miscellaneous tests and other stuff that doesn’t fit neatly into other categories.

Also, topics that frequently are raised in discussions.

DV Stuff

Stock DV versus BOV – How well does a BOV perform compared to the stock DV.

Stock vs Turbosmart – Comparison of response times of the Turbosmart valve versus stock DV.

Stock vs DV+ – Does the DV+ provide measurable benefits versus the stock Diverter Valve?

GFB T9381 DV+ – Discussing my experience with the T9381.

DV Spacer vs BOV sound – In-cabin recording of sound from the ECS DV spacer and Forge BOV.

BOV vs Open Intake – In-cabin sounds from a Forge BOV versus IE V2 Open Intake.

DV vs BOV Analogy – Explaining why a DV doesn’t recirculate excess pressure to help build boost back faster.

Counterfeit DV+ – Showing the performance difference between a Genuine GFB DV+ and a counterfeit product

Intake Stuff

Stock airbox modification – Flow testing the Mk7 stock airbox with additional holes.

Stock airbox modification (continued) – Street logging temperature with the stock airbox that has holes cut in it.

Stock modified airbox vs aftermarket – Comparing flow performance of the stock airbox vs aftermarket with a larger turbo.

Grill intake scoop – Several tests to investigate what, if anything, the intake grill scoop does.

Searching for Ram Air –

Intakes & hydro locked engines – Part 1, Part 2, Part 3 – Checking if water gets into the GTI intake.

Intake power gains – Comparing an aftermarket intake to stock to see if acceleration performance changes.

APR vs Modified stock – APR carbon fiber closed intake compared with a modified stock GTI airbox during street pulls.

Block off plate and underhood temperatures – Comparing the underhood temperature near the oil filter with and without blocking the passenger side duct.

Open vs Closed intake air temperatures – Recording the air temperature entering the turbocharger using each type of intake.

Hybrid turbo intakes – Test of the difference a hybrid optimized setup makes.

Duct Modification Testing –

Intake Insulating Wrap –

Intercooler Stuff

Bicooler outlet temperature with the AC on – Comparing the temperature from the bicooler with a stock location and FMIC with AC operating.

FMIC and SMIC with AC On – Comparing the temperature out of different style intercoolers with the Air Conditioning on.

  • FMICs affecting AC – Measuring the temperature between a FMIC and the AC condenser.
  • More FMIC effects on AC – Measuring the air temperature out of the AC ducts.

Bicooler blues – Evaluating the performance of a Mk7 bicooler intercooler.

Bicooler vs aftermarket stock location – A comparison of data I’ve logged with each type of intercooler.

Bicooler and SMIC – Temperature trends compared for a sampling of products.

Intercooler test trends – Trends observed using different intercooler configurations on the GTI.

FMIC vs SMIC trends – Overall trends of front mounts and stock mount ICs that I have used.

Tube & Fin Stock Location trends – Comparison of four aftermarket stock location Tube & Fin style intercoolers.

Stock vs Aftermarket ICs – Comparison of the performance of the stock GTI IC and an aftermarket stock location IC.

More Stock and Aftermarket IC – Another comparison of the stock GTI IC and aftermarket products.

Bicooler spacer mod – fitting the Majesty bicooler hose to the stock IC.

Bicooler turbo lag – Comparing boost onset time with and without a bicooler.

Tune Stuff

IS38 turbo with IS20 tune – What happens when driving with an IS38 turbo on an IS20 tune?

Cobb IS38 OTS tune – Comparing the Cobb GTI IS38 OTS tune with a customer IS38 tune from EQT.

Random Stuff

IS20 and IS38 Wastegate Adaptation – The steps I went through to calibrate the wastegate actuator.

IS20, IS38, and Garrett Pmax Comparison – Average WHP and WTQ values for these turbos pulled from other people’s dyno charts.

Custom Performance Engineering Mounts – Review of cp-e engine and transmission mounts for the Mk7.

Turbo Inlet Pipes and Boost – Comparing stock and aftermarket inlet pipe boost onset / turbo spool changes.

IAT Sensor Lies – Measurements from the IAT sensor compared with a temperature sensor at the IC outlet.

IAT During Cruising – Measurements from the IAT sensor during cruising show how the sensor inaccurately reports the temperature leaving the intercooler.

Product Reliability – Discussion of the processes involved with determining a product’s reliability.

Ethanol mix time – After filling the fuel tank with ethanol it takes some time for the content analyzer to show the new percentage of ethanol.

DSG Shift Analysis – Comparing the stock DSG shift times with the time using a tuned file.

DynoJet and Virtual Dyno Comparison – Measurements from a dynamometer session on a DynoJet are compared with Virtual Dyno calculations.

Stock vs aftermarket exhaust – Stock GTI exhaust and Baun aftermarket exhaust are compared by evaluating street data.

Vibration Analysis –