K&N Air Filters Added to Stock Air Boxes??

Sh0velMan · 04-17-2013, 08:59 AM

Quote:

Originally Posted by 280z/300zx

The NISMO exhaust is only worth about 7-8hp over stock. It costs only a few hundred less than fast intentions but doesn't give the same 15-18hp that fast intentions does. Again, this has been discussed and dyno proven in the past. I'm not saying the NISMO exhaust is horrible; it's well made and does perform better than stock. What I am saying is that for the money spent there are better options. My stock NISMO exhaust is hanging in my garage while my fast intentions is on my car. Sounds better, lighter, and performs better.

Remember, the NISMO exhaust isn't the only thing giving the NISMO extra power, there is also a better tune and higher rev limit. Those who did the swap but in 2009 when the car first came out only say 7-8hp gains on a stock regular 370z.

This is all pretty much false.

Rev limit identical, tune has slightly different base fuel table data that is tuned out as soon as the car learns fuel data. The exhaust is the only mechanical (engine) difference between the 332hp base Z and the 350hp Nismo Z. The exhaust is good for over 15+ WHP, if tuned or given time for the engine to adjust.

The exhaust is a great option if you don't want to spend too much money.

Buying it NEW is dumb, buying it used for cheap, is very very smart.

Jordo! · 04-17-2013, 09:53 AM

Quote:

Originally Posted by Sh0velMan

This is all pretty much false.

Rev limit identical, tune has slightly different base fuel table data that is tuned out as soon as the car learns fuel data. The exhaust is the only mechanical (engine) difference between the 332hp base Z and the 350hp Nismo Z. The exhaust is good for over 15+ WHP, if tuned or given time for the engine to adjust.

The exhaust is a great option if you don't want to spend too much money.

Buying it NEW is dumb, buying it used for cheap, is very very smart.

First part isn't quite right, at least based on about a dozen or so Nismo vs comparably modded/tuned non-nismo Z's I've seen dynos for. The fueling and spark profile will not adapt to match the Nismo's without tuning.

Also, I thought the Nismo does have a slightly higher rev limit as well -- I could be wrong on that one.

I also remain convinced that the Nismo has slightly different VVEL tuning as well -- although that is yet to be confirmed (hello, GTM?) -- after viewing these dynos I've been accumulating from various folks (all dynojet, BTW).

However, I agree 100% that picking up any Nismo exhaust new is not needed -- get one used for modest gains and good sound without any unexpected rasp or fitment issues.

Sh0velMan · 04-17-2013, 09:59 AM

Quote:

Originally Posted by Jordo!

First part isn't quite right, at least based on about a dozen or so Nismo vs comparably modded/tuned non-nismo Z's I've seen dynos for. The fueling and spark profile will not adapt to match the Nismo's without tuning.

Yes, it will. It takes time and a willingness to actually go to redline @ WOT a number of times over a few days to get the ECU to re-learn. Can be sped up by clearing the learned fuel data at time of install. My baselines with drop ins and the Nismo CBE were well over 295 WHP with AFR's right in line with factory specs. That's not possible if the ECU hadn't re-learned fuel data sufficiently. This is before I had an UpRev license installed.

Also, I thought the Nismo does have a slightly higher rev limit as well -- I could be wrong on that one.

I've never heard of this, would like to see evidence from UpRev to support. (Screen shot of stock ROM)

I also remain convinced that the Nismo has slightly different VVEL tuning as well -- although that is yet to be confirmed (hello, GTM?) -- after viewing these dynos I've been accumulating from various folks (all dynojet, BTW).

Unless you (or anyone) can provide UpRev traces showing VVEL actuator behavior that is different, I'm gonna say it's all the exhaust you're seeing. The H-Pipe design absolutely causes the high end of the curve to take on a different shape, as compared to the stock Y pipe. That shape is visible even in my own dynos with longtube race headers + the Nismo OEM CBE.

However, I agree 100% that picking up any Nismo exhaust new is not needed -- get one used for modest gains and good sound without any unexpected rasp or fitment issues.

Responses in bold.

UNKNOWN_370 · 04-19-2013, 06:22 AM

Quote:

Originally Posted by Jordo!

First part isn't quite right, at least based on about a dozen or so Nismo vs comparably modded/tuned non-nismo Z's I've seen dynos for. The fueling and spark profile will not adapt to match the Nismo's without tuning.

Also, I thought the Nismo does have a slightly higher rev limit as well -- I could be wrong on that one.

I also remain convinced that the Nismo has slightly different VVEL tuning as well -- although that is yet to be confirmed (hello, GTM?) -- after viewing these dynos I've been accumulating from various folks (all dynojet, BTW).

However, I agree 100% that picking up any Nismo exhaust new is not needed -- get one used for modest gains and good sound without any unexpected rasp or fitment issues.

It doesn't have a higher rev limit but peak HP expands from the regular Z

Z= 332hp @7,000rpm
Nismo= 350hp 7,400rpm

Buying the exhaust separately from Nismo, they claim 5-8hp gain with their exhaust. Not sure if i can float with Nismo getting all their power solely from an exhaust considering their claims on the independent exhaust

NISMO Exhaust System 370Z - B0100-1EA25 - Nismo

Sh0velMan · 04-19-2013, 07:44 AM

Quote:

Originally Posted by UNKNOWN_370

It doesn't have a higher rev limit but peak HP expands from the regular Z

Z= 332hp @7,000rpm
Nismo= 350hp 7,400rpm

Buying the exhaust separately from Nismo, they claim 5-8hp gain with their exhaust. Not sure if i can float with Nismo getting all their power solely from an exhaust considering their claims on the independent exhaust

NISMO Exhaust System 370Z - B0100-1EA25 - Nismo

That's the shitty 'S-Tune' exhaust system.

We're talking about the Nismo OEM exhaust, which is good for well over 10WHP in most cases.

Jordo! · 04-20-2013, 11:25 PM

Quote:

Originally Posted by Sh0velMan

That's the shitty 'S-Tune' exhaust system.

We're talking about the Nismo OEM exhaust, which is good for well over 10WHP in most cases.

Hmm. Well, I've had the S-tune previously (about 3-4 whp) and will be bolting on a Nismo take off in July so I'll post before and after results in a few months.

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