Finally got dyno results and now I want more!!

THE BULL · 11-25-2022, 10:14 AM

The Nismo exhaust can be just as restrictive as the OEM. As for the clogged HFCs (how old are they)

It's possible that HFCs could have deteriorated over time due to running them on a stock tune. Possibility of oil from the Breathers and PCV could have contaminated that bank more than the other.

Numbers are a bit low due to exhaust, if indeed you have an under performing HFC then yes he would not be able to add the necessary timing that they usually take. These 3 degrees would have had you closer to 310whp which is not bad when you take in that Nismo exhaust.

One thing you can do is replace resonators in that exhaust or the muffler section.

At the same time look into the HFC issue. Long tubes might introduce rasp on the Nismo exhaust.

Da Flash · 11-25-2022, 11:25 AM

Quote:

Originally Posted by THE BULL

The Nismo exhaust can be just as restrictive as the OEM. As for the clogged HFCs (how old are they)

It's possible that HFCs could have deteriorated over time due to running them on a stock tune. Possibility of oil from the Breathers and PCV could have contaminated that bank more than the other.

Numbers are a bit low due to exhaust, if indeed you have an under performing HFC then yes he would not be able to add the necessary timing that they usually take. These 3 degrees would have had you closer to 310whp which is not bad when you take in that Nismo exhaust.

One thing you can do is replace resonators in that exhaust or the muffler section.

At the same time look into the HFC issue. Long tubes might introduce rasp on the Nismo exhaust.

Thank you for your response. The HFC's were on the car for ~1 year before I got it tuned and the car does burn a bit of oil. I don't have an issue with getting another CBE but, I don't want loud or rasp. It looks like I'm looking for a reasonably quiet "non-restrictive" exhaust to pair up with some LTH's.

Averying · 11-25-2022, 11:30 AM

Quote:

Originally Posted by Da Flash

Thank you for your response. The HFC's were on the car for ~1 year before I got it tuned and the car does burn a bit of oil. I don't have an issue with getting another CBE but, I don't want loud or rasp. It looks like I'm looking for a reasonably quiet "non-restrictive" exhaust to pair up with some LTH's.

Invidia Gemini Cat back is reasonably quiet and has a fantastic refined sound.

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11-25-2022, 10:14 AM	#1 (permalink)
THE BULL Base Member Join Date: Apr 2021 Location: Florida Posts: 216 Drives: G37S Rep Power: 26850	The Nismo exhaust can be just as restrictive as the OEM. As for the clogged HFCs (how old are they) It's possible that HFCs could have deteriorated over time due to running them on a stock tune. Possibility of oil from the Breathers and PCV could have contaminated that bank more than the other. Numbers are a bit low due to exhaust, if indeed you have an under performing HFC then yes he would not be able to add the necessary timing that they usually take. These 3 degrees would have had you closer to 310whp which is not bad when you take in that Nismo exhaust. One thing you can do is replace resonators in that exhaust or the muffler section. At the same time look into the HFC issue. Long tubes might introduce rasp on the Nismo exhaust. Da Flash likes this.

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