Exhaust HP Gains

[FoolCyclist]

After seeing all the different vids on what the various exhausts sound like I'd like to see some HP numbers after the mods. Anybody seen any numbers yet??

[Calum]

Nobody is going to post those yet, not until their products are finalized. Even then the numbers will be scrutinized to death and in the end we wont know which we can believe.

Personally I'll be waiting for independent testing results.

[Fly Guy]

Fujitsubo has some power and torque figures:

http://www.fujitsubo.co.jp/prods/det...04740/00001473

[Dimman]

Originally Posted by Calum

Nobody is going to post those yet, not until their products are finalized. Even then the numbers will be scrutinized to death and in the end we wont know which we can believe.

Personally I'll be waiting for independent testing results.

Plus a bazillion.

[ESBjiujitsu]

yeah you can never trust the companies themselves.... and also what conditions the tests were done. I just cant wait until some board members starts getting fitted with custom exhausts like scooby! Anything really lol.

[powertrip]

not nearly as much as you would hope. most small n/a motors are pointless to do bolton mods for power (there are a few exceptions i will admit, but not many). either gotta go big or just play around.

[TPO]

Originally Posted by powertrip

not nearly as much as you would hope. most small n/a motors are pointless to do bolton mods for power (there are a few exceptions i will admit, but not many). either gotta go big or just play around.

Sad but true

[Draco-REX]

Cat back exhaust will do nearly nothing for power. They're purely for sound/looks and maybe weight if designed properly.

Headers will be where any exhaust gains are found.

[ESBjiujitsu]

what he said~! Just go straight pipes to save weight unless your ears are sensitive

[PERRIN_Jeff]

Originally Posted by powertrip

not nearly as much as you would hope. most small n/a motors are pointless to do bolton mods for power (there are a few exceptions i will admit, but not many). either gotta go big or just play around.

Don't say that too loud, or the K20 guys are going to come over here and start getting cranky....

Everyone should spend a little time on the K20 forums and see what these guys are getting. These guys make 70 Wheel HP over stock like its going out of style. Key to all these mods is going to be tuning.

[Gardus@Supersprint]

Right now the only header kit I've seen is the HKS, and no results are available yet.

[MindtheGap]

Originally Posted by PERRIN_Jeff

Don't say that too loud, or the K20 guys are going to come over here and start getting cranky....

Everyone should spend a little time on the K20 forums and see what these guys are getting. These guys make 70 Wheel HP over stock like its going out of style. Key to all these mods is going to be tuning.

The K20 responds great to even just bolt ons. Now I dont expect this car to be as responsive, but we cant just assume it will get nothing

[86'd]

Originally Posted by PERRIN_Jeff

Don't say that too loud, or the K20 guys are going to come over here and start getting cranky....

Everyone should spend a little time on the K20 forums and see what these guys are getting. These guys make 70 Wheel HP over stock like its going out of style. Key to all these mods is going to be tuning.

I think the gains will be somewhere between the K20 and F20/F22.

And you're right, tuning is going to be a huge factor.

[Calum]

The K20's head ports are HUGE right out of the box, and they flow really well. That why they can make so much power. I REALLY want someone to flowbench the FA20 heads.

[PERRIN_Jeff]

Originally Posted by MindtheGap

The K20 responds great to even just bolt ons. Now I dont expect this car to be as responsive, but we cant just assume it will get nothing

It does respond good. The few catback only results I found for the K20 show about the same HP as our catback made on the BRZ. So one could say the BRZ should really take to the same kind of easy bolt on gains.

Originally Posted by 86'd

I think the gains will be somewhere between the K20 and F20/F22.

And you're right, tuning is going to be a huge factor.

If we could only do some tuning now!

Originally Posted by Calum

The K20's head ports are HUGE right out of the box, and they flow really well. That why they can make so much power. I REALLY want someone to flowbench the FA20 heads.

Cosworth has one of these engines and according to them, there is lots of potential for this engine.

[Pekingduck]

The Toyota Rep for TRD said it suppose to get 9 HP from the intake and 4 hp from the exhaust with their products. It might be conservative numbers for the exhaust since they have noise pollution they have to control. Also I talk to their product manager at Toyota Corporate during the first 86 event and he said the motor very untap because they would have to change other things in the car and at the end drive up the cost of the car. I don't expect K20 HP gains from bolt on but I do expect to see a good amount. I want to see 200whp with I/H/E chip and some few other bolt on, but I might just be dreaming.

[Brian S]

Originally Posted by Fly Guy

Fujitsubo has some power and torque figures:

http://www.fujitsubo.co.jp/prods/det...04740/00001473

Well, from their testing, that torque dip was most likely due to excessive back pressure in the exhaust system for emission purposes. I just knew that had to be the reason for the dip based on the RPM range. Cat back exhaust with a minor tune will be the first thing I do to this car.

[blu_]

Originally Posted by Pekingduck

The Toyota Rep for TRD said it suppose to get 9 HP from the intake and 4 hp from the exhaust with their products.

Thats untuned and pretty sure the exhaust is an axle back, which means negligible gains if any.

[Fly Guy]

The TRD exhaust has gotta be a cat-back because the OEM pipe before the muffler isn't like this:

[dabocx]

Originally Posted by PERRIN_Jeff

It does respond good. The few catback only results I found for the K20 show about the same HP as our catback made on the BRZ. So one could say the BRZ should really take to the same kind of easy bolt on gains.


If we could only do some tuning now!


Cosworth has one of these engines and according to them, there is lots of potential for this engine.

O_o

I can sleep worry free now.

[Calum]

^^^What he said.

[Tad_07]

Originally Posted by Draco-REX

Cat back exhaust will do nearly nothing for power. They're purely for sound/looks and maybe weight if designed properly.

Headers will be where any exhaust gains are found.

Headers on a N/A will be the biggest again for hard parts (except for forced induction options down the road). I don't think there will be much gained on a BRZ/FRS though from the looks of the factory header. I'd be surprised if the entire exhaust gain more than 15whp.