Testing AAM Midpipes with Short Tails and Z1 Intakes.

SS_Firehawk · 12-08-2015, 01:55 PM

Definitely agree with everyone, I was expecting something... lol. I'm still on stock cats right now and no tuning was done. When looking at the uncorrected numbers, on the chart with all the runs, you can see the intakes are adding power up top. On both dyno plots on the uncorrected graph that has Z1 intakes, it's making more power up top. When we start looking at SAE results, everything gets masked in calculations.

Edit: Those cats are definitely bottlenecking the exhaust. I guarantee opening that up would gain at least 10whp no tune on RTP's or TP's. It's almost like confirmation that to get more power over a Nismo exhaust with an aftermarket exhaust, you need to replace your cats.

jwick · 12-08-2015, 02:18 PM

Quote:

Originally Posted by SS_Firehawk

Definitely agree with everyone, I was expecting something... lol. I'm still on stock cats right now and no tuning was done. When looking at the uncorrected numbers, on the chart with all the runs, you can see the intakes are adding power up top. On both dyno plots on the uncorrected graph that has Z1 intakes, it's making more power up top. When we start looking at SAE results, everything gets masked in calculations.

Edit: Those cats are definitely bottlenecking the exhaust. I guarantee opening that up would gain at least 10whp no tune on RTP's or TP's. It's almost like confirmation that to get more power over a Nismo exhaust with an aftermarket exhaust, you need to replace your cats.

I went full bolt-on prior to FI and I can say without a doubt that swapping the stock cats for HFCs was the single biggest NA mod.

Memphis370Z · 12-08-2015, 10:01 PM

Quote:

Originally Posted by SS_Firehawk

Definitely agree with everyone, I was expecting something... lol. I'm still on stock cats right now and no tuning was done. When looking at the uncorrected numbers, on the chart with all the runs, you can see the intakes are adding power up top. On both dyno plots on the uncorrected graph that has Z1 intakes, it's making more power up top. When we start looking at SAE results, everything gets masked in calculations.

Edit: Those cats are definitely bottlenecking the exhaust. I guarantee opening that up would gain at least 10whp no tune on RTP's or TP's. It's almost like confirmation that to get more power over a Nismo exhaust with an aftermarket exhaust, you need to replace your cats.

This was the case with my Z. I swapped out the stock cats for HFCs, after replacing the CBE, and I noticed an immediate improvement in how the engine performed. Night and day.

EzDz · 12-08-2015, 10:55 PM

The car wont breathe better without long tubes or test pipes that is why there are no gains the flow is restricted by stock cats, my

jwick · 12-09-2015, 12:45 PM

Quote:

Originally Posted by EzDz

The car wont breathe better without long tubes or test pipes that is why there are no gains the flow is restricted by stock cats, my

It won't breath better without unchoking the OEM cats. Mine saw dramatic improvement with HFCs so you don't have to completely dump them to see gains. You just have to get rid of the OEM cats which are the biggest restriction in the system.

12-08-2015, 01:55 PM	#1 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	Definitely agree with everyone, I was expecting something... lol. I'm still on stock cats right now and no tuning was done. When looking at the uncorrected numbers, on the chart with all the runs, you can see the intakes are adding power up top. On both dyno plots on the uncorrected graph that has Z1 intakes, it's making more power up top. When we start looking at SAE results, everything gets masked in calculations. Edit: Those cats are definitely bottlenecking the exhaust. I guarantee opening that up would gain at least 10whp no tune on RTP's or TP's. It's almost like confirmation that to get more power over a Nismo exhaust with an aftermarket exhaust, you need to replace your cats. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction Last edited by SS_Firehawk; 12-08-2015 at 01:59 PM.

12-08-2015, 10:55 PM	#4 (permalink)
EzDz Enthusiast Member Join Date: Aug 2015 Location: Pittsburgh Posts: 309 Drives: 2016 370z Nismo Tech Rep Power: 10	The car wont breathe better without long tubes or test pipes that is why there are no gains the flow is restricted by stock cats, my __________________ Nismo \| Moore Performance \| AAM \| Tein \| PPE \| Tomei \| Eibach \| Z1 Sponsored: Mishimoto

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