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Old 09-07-2010, 03:32 PM   #1
Motion Lab Tuning
Former Vendor
 
Member#: 228856
Join Date: Nov 2009
Chapter/Region: South East
Location: AEM Infinity Trained
Default Motion Lab Tuned: HTA68 2.5L vs 2.1L (Stroked), same day results, same dyno

HTA68 Turbo on a 2.5L vs 2.1L

We tuned both of these cars on the same day, within an hour of each other. We thought you guys might like to see a fair comparison of how the HTA68 performs on the two different motors. These cars have similar mods including the turbo, just the difference in displacement. Below you will see the dyno charts and a comparison of the boost levels between the two. First off for a full mod list of both cars.

2004 WRX with a 2.1L stroker (79mm crank):
Short Ram, TBE, HTA68, MLT 750cc Injectors, STI cams, MLT 3-Port EBCS, Stock WRX TMIC

2004 STI with 2.5L: HKS intake, BC 280 cams, MLT 820cc injectors, MLT 3-Port EBCS, Stock STI TMIC


Ok now for the graphs:

Here is the 2.1L Final Pull:



And Here is the Sti final Pull:




And here is the comparison between the two:




As you can see the 2.5L made much more torque while the 2.1L made pretty much the same peak HP. The boost just drops off on the 2.5L while the 2.1L held boost much better. To see this even better here is the Boost Graph comparing the two!

Boost Graph Comparison:


You can see the 2.5L spools about 500 RPMs quicker than the 2.1L and if you refer to the power comparison you can also see the peak HP on the 2.5L comes about 500 RPMs sooner than the 2.1L as well. Although we think that the HTA68 is a nice daily driver turbo on the 2.1 or even a 2.0L, it really dies off too hard up top on the 2.5L

Jordon @ Motion Lab







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