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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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12-16-2013, 01:56 AM | #71 | |
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Ouch, it's pretty rare for that to happen as the flow usually doesn't allow it to happen. Or you have one of those idiotic setups with a cat pre-turbo (what nimrod thought that up?) |
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12-16-2013, 03:34 AM | #72 |
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So it is better to run with high flowing cat or no cat for power gains?
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12-16-2013, 04:56 AM | #73 |
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Yes I had the stock exhaust manifold which was pre-cat,....had my suspicions but was re-assured its fine as we have XXX number of FA20's running this setup with no issues.... costly lesson for me, but also an excuse to upgrade.
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12-16-2013, 06:26 PM | #75 |
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Not to mention recover all that platinum even if it is all gummed up from driving.it around. I'm keepinging it.
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12-16-2013, 08:36 PM | #76 | |
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Glad someone else did it also! Sounds better then I thought. Nameless track pipe?
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12-16-2013, 08:44 PM | #77 |
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This is from the Perrin Blog. All Credit goes to PERRIN.
This was the first time we had tested our headers on the dyno. Based on the things we know about the car and some of its variables, we knew it would be key to do this all on the same day as all the other parts. This ensures that the HP gains we saw were legit. After seeing some peoples dyno results showing huge gains of 15-20 WHP I was excited to see what we could do. We started with two designs to see where we would be for HP, then do further tweaking from there. Continuing from earlier in the day, the car still has all the other exhaust parts we make bolted on to it. This includes our 2.5″ catback exhaust, catless 2.5″ front pipe and 2.5″ Overpipe and NO ECU tuning. A simple test that I am surprised no other vendors have done is take the stock header and remove the car. The stock header is built pretty good, as its a tri-y design or a 4-2-1 design. The stock header primaries are 1.625″ and the secondaries are 1.75″. So this is good as it matches the stock exhaust ports and matches what some header calculators say it should be. One of the flaws I see is with two bends where they merge almost into each other. You can see this on Cylinder #1 and 2 above. The other flaw I see is the cat. Its not a high flow metallic core, but the standard ceramic brick which for sure will cause some restriction. Removing the cat to free up some airflow is a very simple way to see how a properly built 4-2-1 header might perform. You can see that there are places it gains HP. Overall the HP gains were not huge, but the ECU really liked the header with no cat. We see evidence of this because the HP and TQ was more consistent run to run. Even though the WHP gained wasn’t much, but you can see how at higher RPM’s the header starts to do pick up some HP. Driving on this for a week or two I also found the same thing in that the engine was smoother and more consistent with a little more top end power. So no cat and only 3 HP
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12-16-2013, 08:53 PM | #78 |
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Custom made!
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The Following User Says Thank You to ML For This Useful Post: | NickFRS (12-16-2013) |
12-16-2013, 09:07 PM | #79 | |
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P.s this isn't a debate about highflow cats. that's a subject that has been flamed elsewhere in the forum.
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The Following User Says Thank You to NickFRS For This Useful Post: | TOTO_86 (12-16-2013) |
01-03-2014, 02:45 AM | #80 |
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This is mine due to go on tomorrow, will see how it fares with the S/C:
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01-03-2014, 11:56 AM | #81 |
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^this and it will sound like poo on a dirty stick
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01-03-2014, 12:56 PM | #82 |
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no, not really
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01-11-2014, 10:06 AM | #83 |
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Anyone tuned for deleting the cat yet?
Comparing the untuned perrin result against untuned borla result (drift office thread) has me wondering what's left on the table. |
01-12-2014, 05:35 AM | #84 |
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Got my deleted items running today. Sounds fucking awesome! Car was dropped off at the tuner. Waiting for results.
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