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BRZ / FRS Mod Guide

We did some testing on a 2013 FRS here at our shop and wanted to share the results with you guys! This was a completely stock FA20 FRS  and we did 5 stages of modifications from stock and kept track of the results to compare. All of these results are uncorrected numbers which are 10-15% lower than you would expect to see on a Dynojet dyno or our “Shootout” numbers. For more information on comparing dyno numbers check out our dyno page.

Our starting point was completely stock. With no tuning, no modifications, and with 91 octane fuel.

This vehicle made 143.5 HP and 118.1 TQ on our Dyno. The factory rates these cars at 200 HP and 151 TQ at the crank.

Below you find the information of our findings along with dynographs for comparison. If you have any questions about building your 2013+ FRS/BRZ, give us a call (763) 316-5882.

Stock vs Stage 1

For our Stage 1 tune we took our totally stock 2013 FRS and added a Grimmspeed Intake. On 91oct we were able to make 147.8HP and 121.0TQ. With our Stage 1 Tune we are already working on minimizing the 4000rpm Torque Dip and have increased power by 4-7HP throughout the whole power band. We were able to make a 5% or 7 HP increase in Power at 7300rpm and 9% or 9FtLb increase in Torque at 4300rpm. You can expect a 5+ HP increase in power on 93oct.

Stock vs Header/Stock Tune

For Stage 2 we did a few stages of adding parts to see what they gain individually. We first put on an Invidia Catless Header. The car made 152.3HP and 120.8TQ. With the stock tune and Header/Intake, the car started picking up power at 3500rpm and slowly increased power over stock till it peaked at 7% or 11HP over Stock. At 4300rpm the car gained 4% or 4FtLb of Torque. That’s not bad for just bolting on a header. It deffently leaves power on the table when running a header with no tune but you still see gains from the header itself. The car was running leaner under full throttle then the stock tune so we definitely don’t recommend doing Header/Intake without a tune.

Stock vs Header/Intake Stage 2

We then performed a custom tune with the Intake and Header. We were able to make 154.3HP and 124.1 TQ. With our Stage 2 Tune we minimized the 4000rpm Torque Dip even more than our STG 1 Tune and gained 12% or 12.7FtLb Torque at 4300rpm and 9% or 12.8 HP at 7200rpm. We were able to increase the power by 7-10HP from 3700 to 7800rpm. You can expect a 5+ HP increase in power on 93oct. Different headers can also increase/decrease power as some are better designed than others.

Next we installed a Tomei Over Pipe and Invidia Front Pipe. With the addition of those parts we made 155HP and 124.4TQ. Power remained pretty much the same from about 4600rpm to 7800rpm but from 3500-4500rpm we saw a 3-5HP increase over just the header. The max power increase remained about 9% or 13HP at 7200rpm but Torque increased to 18% or 18.6FtLb at 4100rpm over stock. Again you can expect a 5+ HP increase with 93oct.

Different headers can also increase/decrease power as some are better designed than others.

Stock vs Stage 3/E85

For our final test we drained out all the 91oct and put some Corn in. Utilizing the RaceRom Flex Fuel Features on Ecutek, we tuned the car on E85. We were able to make 161.8 HP and 129.3 TQ. The 4000rpm Torque Dip is almost nonexistent. From 3500 to 7800 we are making 13-20 more Horsepower over stock and a peak of 14% or 19.7HP at 7200rpm and 23% or 23FtLb or Torque at 4100prm.

Different headers can also increase/decrease power as some are better designed than others.

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(763) 316-5882