Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - PTUNING 4-1 Full T304 SS Equal Length Double-Slip Race Header (200+whp 93 pump gas)

ptuning · 08-12-2014, 03:16 AM

It's nice having a dyno inside of an enclosed sound abatement chamber. It allows us to dyno tune round the clock without the cops showing up.

Anyhow, as promised, we have dyno numbers for you guys.

Since everyone and their mother runs a header with some sort of exhaust system in place, we decided to do the same. Since we don't offer a 2.5" overpipe or front pipe, we decided to test our header with our 3" header-back exhaust system. This was intended to be used with front mount turbo systems, but the results here weren't too shabby. We just need to figure out what combination of additional resonators and mufflers are needed to keep the volume down a bit.

We kept the variables low by running a completely stock airbox and filter. The inlet snorkel and rubber intake pipe are also OEM and unmodified. The car was tuned using ECUTek on 93 pump gas.

The dyno numbers were achieved with ambient temps in the 75-77F range as verified by the dyno AIT sensor and an external air temp sensor box. Dynoruns for this car are always done in 5th gear (1:1). A stock FR-S/BRZ puts down around 160whp on our dyno. We'll post a dyno sheet tomorrow with a baseline for referencing.

The cams were dialed in to within 5 degrees. I would have gone down to 2-3 degrees, but at 5 degree increments I already found myself having to jump out of the car after each dyno pull to get a close up of the dyno monitor once we were near our target cam setting. BTW, for those that don't know, the high resolution data plotted by a Dyno Dynamics dyno allows you to analyze every pixel that gets plotted on the screen since it does not use a smoothing algorithm to plot a dyno curve.

Since a lot of folks going the NA route autocross and track their cars, we also wanted to test the header to 8k rpms to see if there was still enough usable power on tap to allow you to stay in gear without having to up shift or bounce of the rev limiter. The results were definitely acceptable given that 180whp was still available near 8k.

All in all our 4-1 Race Header performed extremely well and quite honestly, even exceeded our expectations.

- Toan

08-12-2014, 03:16 AM	#32
ptuning Senior Member Join Date: Sep 2012 Drives: White FR-S Location: Manassas, Virginia Posts: 537 Thanks: 272 Thanked 1,003 Times in 305 Posts Mentioned: 146 Post(s) Tagged: 3 Thread(s)	It's nice having a dyno inside of an enclosed sound abatement chamber. It allows us to dyno tune round the clock without the cops showing up. Anyhow, as promised, we have dyno numbers for you guys. Since everyone and their mother runs a header with some sort of exhaust system in place, we decided to do the same. Since we don't offer a 2.5" overpipe or front pipe, we decided to test our header with our 3" header-back exhaust system. This was intended to be used with front mount turbo systems, but the results here weren't too shabby. We just need to figure out what combination of additional resonators and mufflers are needed to keep the volume down a bit. We kept the variables low by running a completely stock airbox and filter. The inlet snorkel and rubber intake pipe are also OEM and unmodified. The car was tuned using ECUTek on 93 pump gas. The dyno numbers were achieved with ambient temps in the 75-77F range as verified by the dyno AIT sensor and an external air temp sensor box. Dynoruns for this car are always done in 5th gear (1:1). A stock FR-S/BRZ puts down around 160whp on our dyno. We'll post a dyno sheet tomorrow with a baseline for referencing. The cams were dialed in to within 5 degrees. I would have gone down to 2-3 degrees, but at 5 degree increments I already found myself having to jump out of the car after each dyno pull to get a close up of the dyno monitor once we were near our target cam setting. BTW, for those that don't know, the high resolution data plotted by a Dyno Dynamics dyno allows you to analyze every pixel that gets plotted on the screen since it does not use a smoothing algorithm to plot a dyno curve. Since a lot of folks going the NA route autocross and track their cars, we also wanted to test the header to 8k rpms to see if there was still enough usable power on tap to allow you to stay in gear without having to up shift or bounce of the rev limiter. The results were definitely acceptable given that 180whp was still available near 8k. All in all our 4-1 Race Header performed extremely well and quite honestly, even exceeded our expectations. - Toan Last edited by ptuning; 08-12-2014 at 03:32 AM.