Breather mods

SRB-2NV · Apr 2, 2015

Just incase no one has seen this before here it is: http://www.twinturbo.net/nissan/300...C-MASSIVE-SMIC-amp-25-Piping-results-PT1.html

I have compiled all of the dynocharts to compare the differences in power output at various boost levels to show the differences between the setups.

The car was tuned with the ZEM in its original setup with the 2" OEM piping and Stillen SMICs. Once the tune was perfected with this setup and all of the runs were made, the only thing that was changed was the intercoolers and piping. The exact same programs were used in the second test as was used in the first (there were three different programs created along the way to handle pumpfuel, racefuel, and maximum boost).

1.2bar:

1.3bar:

1.4bar:

1.5bar:

1.6bar:

1.7bar:

1.8bar:

After looking through the data to see where the differences were in the other datalogged pieces of information, it is obvious to see that the engine is simply breathing more air, especially down low with the larger piping/intercoolers. The A/F is a bit different between the runs on the bottom end simply because it is using a different part of the fuel table as a result of the additional airflow. More air = more fuel delivered = richer mixture. On the top-end of things, the A/F is slightly different as well and it will account for some of the improved power. I did not want to change the programming that was used as I felt that this would lead to possible suspicion by some folks. If I had adjusted the program to make the A/F the same, the difference in numbers would have been even more dramatic through the bottom end up to midrange, showing greater improvement in bottom end, and with a slight detriment to top end power as it seems to want to run a tad bit leaner with the new setup, albeit a rather marginal difference though. It would be even nicer to see the difference if Dee's car had 60mm throttlebodies, which are essentially the same size as the 2.5" piping we installed. Even despite this limitation, it was apparent that the piping and intercoolers contributed quite a bit on their own. I believe we were really tapping out though on the benefit of the piping/intercoolers as the power was increased on the top end because of the limitation of the throttlebody. At this peak power level (650RWHP), there is a tremendous amount of air flowing through each throttlebody and I believe the 2.0" OEM throttlebodies started to become our bottleneck.

So, this is the preliminary dynochart data and qualitative review of what I see so far and as soon as I get everything together in the quantitative analysis department, I will be more than happy to share it all.
Click to expand...

I'm fairly keen to try a set of 2.5" pipes and the japtek massive smic's that are out but i'm curious if any of you have any feedback to give? More from people who actually have the pipes and have real experience with them.

wassaw7 · Apr 2, 2015

Not sure on the intake piping, but I still have a pair of Japtek SMICs for sale if you want to try them?

SuperZ · Apr 3, 2015

mtentori said: ↑

Not sure on the intake piping, but I still have a pair of Japtek SMICs for sale if you want to try them?
Click to expand...

I think he is after the extra large Japtek SMIC's

SRB-2NV · Apr 4, 2015

SuperZ said: ↑

I think he is after the extra large Japtek SMIC's
Click to expand...

That i am.

but i would have thought one or more of you would have tried the 2.5" piping.

slicktop_beast · Apr 5, 2015

SRB-2NV said: ↑

That i am.

but i would have thought one or more of you would have tried the 2.5" piping.
Click to expand...

yeah i also thought more people on here would have experience with the 2.5 piping. getting over how much power loss there is between driving early morning and driving around midday with the stock coolers. been looking at the largest z1 coolers that will fit the stock 2 inch piping. seems like its my next upgrade. i was originally looking at the ash spec piping kit, but a little out of my price range atm. very keen on seeing what the results are if you go the 2.5

BLACK BEAST · Apr 5, 2015

The results of the breather mods have been proven (and debated on here )

The above US dyno tests show the results on the same tune and stock throttlebodies.

Adding throttlebodies with a tune to suit will make more of a significant gain .(especially in the midrange)

Piping ,intercooler/s and throttlebodies is the complete upgrade for best results.

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