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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-15-2014, 11:32 PM   #1
NickFRS
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RevWorks UEL Header + Nameless Catted Front Pipe VS Stock Gutted Header + FP

Decided to Gut the cat out of my header. Then Had my cousin cut out the cat+res in my stock front pipe. Swapped out the gutted stock parts with the RevWorks UEL Header + Nameless 2.5 Catted DP and something weird happened. Oh I also removed my 3in Perrin intake. It seems with no weather correction (No weather correction on either dyno pulls) It made .1 less HP and maybe 5lb's less torque.... Dyno Graphs will come when I get home from work in a couple hours.

Oh this is also on a innovate Supercharged Car.



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Cousin just finished it up. i'll get better photos of the gutted header when i pick it up



















239.4HP dyno = Innovate SC, stock plugs, 3in Perrin intake, Revworks UEL Header, Nameless 2.5 Catted OP/DP, Nameless 3in to Dual 2in Catback Exhaust Proto.



239.3HP dyno = Innovate SC, 2 Step Colder HKS Plugs, Stock intake w/ Cosworth Filter, Stock Gutted Cat Header, Stock OP, Stock FP W/Cat/Res delete, Nameless 3in to Dual 2in Catback Exhaust Proto.



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Last edited by NickFRS; 01-23-2014 at 06:22 AM.
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Old 01-15-2014, 11:35 PM   #2
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Sounds like the high flow cat in the nameless op/fp is badass and the revworks header sucks. Did you have a dialed in tune for each setup?

I'd put the nameless op/fp back on
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Old 01-15-2014, 11:42 PM   #3
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Quote:
Originally Posted by FrsDuke View Post
Sounds like the high flow cat in the nameless op/fp is badass and the revworks header sucks. Did you have a dialed in tune for each setup?

I'd put the nameless op/fp back on
Yes BRZedit Custom Tune By Bobby @ PREracing in Portland Oregon for both set ups. The new tune actually has reduced timing. I would't say the RevWorks header sucks. it made good power for me. You can only create the wheel so many times. The main thing is the stock header isn't that bad of a design for the most part. Most people forget almost all AM headers don't have a cat. So OBV there will gains over the stock header w/cat. Everyone shows dyno comp from a stock header w/cat vs their header w/o cat. Not a stock header with a cat gut or delete vs their product w.o cat. If that makes sense. If anything removing the cat from the Nameless FP would produce more power. But even high flow cats are restrictive.

I think i'll keep this set up for a while. It actually sounds kinda bad ass.
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Old 01-15-2014, 11:53 PM   #4
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Hard to tell what happened there with three parts getting changed. I'm guessing the stock header is more designed toward high end torque thus you didn't lose much top end. I would bet the nameless op/fp even with a cat flows better than the gutted stock piece if it is compared to stock overpipe and modified front pipe. The stock overpipe is a mess.
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Old 01-16-2014, 12:08 AM   #5
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Did you weld in a pipe in place of header cat or delete?

I'm strongly considering doing one or the other and trying a na s2 tune
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Old 01-16-2014, 12:20 AM   #6
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Its already been shown that this car with FI shows much smaller gains with after market headers.
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Old 01-16-2014, 01:09 AM   #7
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Did you weld in a pipe in place of header cat or delete?

I'm strongly considering doing one or the other and trying a na s2 tune
Pictures added. Later down the road when I add water/meth and the intercooler to the charger i'll prob have him chop out the cat and put a pipe in. Also prob have him merge the runners with a smoother transition. For now I don't see a point.


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Its already been shown that this car with FI shows much smaller gains with after market headers.
This is sorta true.

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Hard to tell what happened there with three parts getting changed. I'm guessing the stock header is more designed toward high end torque thus you didn't lose much top end. I would bet the nameless op/fp even with a cat flows better than the gutted stock piece if it is compared to stock overpipe and modified front pipe. The stock overpipe is a mess.
The graphs actually almost look the same. There is less of a dip with the gutted stock header set up. Graphs will be posted in about 2-3 hours. Also it seems there is more torque down low now. I agree the stock overpipe is a mess. But I don't see $1000 in parts being worth 4tq n .1HP. Car feels the same.
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Old 01-16-2014, 12:22 PM   #8
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So can I attempt to sum up a conclusion here?

The primary reason aftermarket Headers/Pipes produce gains are because they remove/replace the catalytic converters. If you remove/gutt the stock header/pipes catalytic converters you will get nearly identical gains in hp (after tune).

This means that spending $1000-$2000 on pipes is not necessary to get a good increase in HP.
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Old 01-16-2014, 01:37 PM   #9
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So can I attempt to sum up a conclusion here?

The primary reason aftermarket Headers/Pipes produce gains are because they remove/replace the catalytic converters. If you remove/gutt the stock header/pipes catalytic converters you will get nearly identical gains in hp (after tune).

This means that spending $1000-$2000 on pipes is not necessary to get a good increase in HP.
When compared to this particular header on a blown setup tuned at this shop. I don't think you can make a blanket statement based on this one example. Much like the stock intake, the stock exhaust has proven hard to improve on. Some folks have had more success than others. I'm glad you got good results Nick! I want to keep one cat in my system and I'm going to pay for that.
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Old 01-16-2014, 07:20 PM   #10
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Quote:
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When compared to this particular header on a blown setup tuned at this shop. I don't think you can make a blanket statement based on this one example. Much like the stock intake, the stock exhaust has proven hard to improve on. Some folks have had more success than others. I'm glad you got good results Nick! I want to keep one cat in my system and I'm going to pay for that.
The funny thing is the car is quiter now catless then with the catless UEL header + nameless frontpipe w/cat. Dyno graphs will be posted tonight. Didn't have time to finish my photoshop comparison.
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Old 01-17-2014, 05:03 AM   #11
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*update* dyno sheets are in 1st post
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Old 01-17-2014, 10:22 AM   #12
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Any sound clips?
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Old 01-17-2014, 10:27 AM   #13
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Quote:
Originally Posted by NickFRS View Post
The funny thing is the car is quiter now catless then with the catless UEL header + nameless frontpipe w/cat. Dyno graphs will be posted tonight. Didn't have time to finish my photoshop comparison.
Stock header should be of thicker sidewalling than an aftermarket one.
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Old 01-17-2014, 10:34 AM   #14
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Quote:
Originally Posted by FrsDuke View Post
Sounds like the high flow cat in the nameless op/fp is badass and the revworks header sucks. Did you have a dialed in tune for each setup?

I'd put the nameless op/fp back on
With his uel header, you see it made more torque down low and did better job in dip area...
This is still impressive. Why did I spend LOTS of $$?
Lol
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