Advice new style Stillen S.C. Intercooler pipe (MAFs at TB)

NissanTracker

Hi Forum,


Got annoyed with Stillen's setup with the MAFs behind the front bumper. Each time the fans turn on, despite making shields, idle always changes. I know TopGunz has a cool A-A setup, but I already upgraded my A-W cooler and water pump, so wanted to cut some pipes this weekend :-)

Question, from the photos given, should I be OK for mounting MAF flanges before the TB's? This setup is on an 07 350z nismo. Much appreciated!

**EDIT***
It's only for myself, no intentions of making these for others. If I had the dough, I would rather go with TopGunz sexy setup. Also, no plans for more boost. Next year I'm going with the 370z Nismo and leaving it untouched while keeping my 350z for HSDE's




Coupler is just there to hold it for the photo, will be welded




I believe I will keep the 45 degree coupler there. One thing I didn't like about the Stillen OE pipe is there was no movement. It was not 100 percent lined up on mine.

ByThaBay

I am almost certain it won't provide you with clean stable MAF reading that you are looking for. Tuned a fair amount of these things, the best way to go is full SD tune VIA ecutek. PM me if you decide to go the full SD route.

ByThaBay

Also, you should make sure that once any air gets past the MAFs it stays in the system and doesn't escape or get recirculated back through them somehow.

TopgunZ

That means purging it and purging it quick. That 1" Bosch valve doesn't do a great job of that and you will be dumping to atmosphere now. Get a bigger valve.

This is especially true if running high boost. At 8psi you might be ok.

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NissanTracker

I did upgrade to the turbo smart dual bypass valve. Why dumping to the atmosphere? I was going to recirculate it. With that dual bypass, I could also dump half to atmosphere, the other half recirculated.

NissanTracker

How different is my placement versus the A-A setup? Question really is

1) will my MAF readings be more accurate than MAF readings where Stillen places the MAFS.

2) in the first photo, is it a "Stable" spot to put MAFs. I thought there was a general rule with MAF positions
A) should be equal length (close to it)
B)should be placed xx inches away from any major turns
C) at least 6 inches away from the TB's ( not sure about this one)

NissanTracker

I do agree with speed density versus MAFs with EcuTek. I'm using UpRev and will most likely stick with it for this set up.

TopgunZ

Like I said it depends on boost levels. That turbosmart is still a 1" intake but a dual exhaust so it might flow better than the Bosch. Now that the mafs are post sc you can dump or recirc. Recirculating will keep the noise down if stealthy is your goal. At 11 psi the 1" exhaust chokes out bad.

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ByThaBay

Yes the readings will be more accurate, however, they will still be far off from ideal. Since the intake manifold combines the two throttles into one input, The fueling for each bank will be error prone since the car still thinks each maf is feeding the engine using the OE design.

Aside from the balance issue, there’s the problem of uneven flow between banks which can appear under certain conditions.

In addition, with uprev it will not be possible to implement any custom code to optimize the performance such as dynamic timing adjustments based on load or various failsafes to prevent engine damage. A properly ecutek tuned SC kit will maintain perfect AFRs vs target and a smooth consistent engine load when compared to MAF configured vehicle on uprev.

7ssain

I dont think the 350z is supported by EcuTek

ByThaBay

Oh yeah, good call I totally missed that since this is a 370z forum.

NissanTracker

Yeah, I did some more research and my 350z HR is not supported by EcuTek. I apologize for the confusion, but this forum is my go to. Closer to the 370z than first gen 350z. If I had a 370z, EcuTek would obviously be my first choice ;-)

ihiryu

When I was stillen SC'ed still I went full SD as well, however my idle was never spot on. Close, but not spot on.

NissanTracker

Thanks for the info everyone. Unfortunately, I do not weld. I'm going for a tune this week since I just upgraded to a dual exhaust (Motordyne TDX). I'm going to have the shop weld the piping and I'll schedule another tune with the new pipe setup and report results.

Before posting, I was well aware of the flaws of the OE Stillen S.C. design. The goal was to just move the MAFs closer to the TB's.

In summary, it looks like I will be in better shape, but not ideal(as ByThaBay clearly stated due to UpRev). Since I'm staying below 11psi, as TopGunz pointed out, the bypass valve should suffice. No plans for a built motor so I will stay on the OE pulley.

I do want to get rid of that awful offset coupler used on the S.C -> intake pipe. I could possibly vent the valve 100% to atmosphere and add a filter in place. I am hoping to achieve 370-380wHP on a conservative tune. Currently, I am at 350wHP with mods; HFCs, Tanabe Y pipe, and OE 350z Nismo exhaust (single mid-pipe).

Any ideas if flow rate with that offset coupler will be a problem?

-NT

TopgunZ

I have a slightly used kit that I am willing to sell for a discounted price if you are interested in going that route. It comes with that filter you are looking at replacing already. I can send the parts to adapt that turbosmart valve to it also. LMK.

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