Stillen g3 intake

m4a1mustang · 06-08-2009, 08:39 AM

Quote:

Originally Posted by semtex

I've been thinking about this some more. The only potential downside to bringing in air from the fangs is that it might soak up heat from asphalt. That's why they don't design these things to draw air from low to the ground to begin with -- at a certain point you'll draw in heat rising from the surface and that'd be counter-productive. This is where R&D comes into play to figure out if the fang openings are too low to the ground.

I don't think this will really be an issue. Corvettes are notorious bottom-feeders.

semtex · 06-08-2009, 11:42 AM

^See post 14.

ZforMe · 06-08-2009, 11:44 AM

Apparently I never completed the first page of this thread, MY BAD!

CBRich · 06-08-2009, 11:57 AM

I am not thinking the heat is the issue as much as getting good air flow to the intakes. Being trapped behind the bumper limits the airflow and having the ducts directly in front of them would be the optimal solution. But if we can force air up behind the bumper with ducts that should also work great.

semtex · 06-08-2009, 01:16 PM

Glad you posted that pic, Modshack. The slots aren't nearly as low as I had pictured them in my head. Yeah I'm not worried about heat coming off the road anymore.

ZforMe · 06-08-2009, 01:28 PM

I still want to see the snorkel idea tested. LOL

Modshack · 06-08-2009, 01:47 PM

Quote:

Originally Posted by semtex

Glad you posted that pic, Modshack. The slots aren't nearly as low as I had pictured them in my head. Yeah I'm not worried about heat coming off the road anymore.

Yeah...doesn't look so bad. I should be able to get on this toward the end of the week. Due to a Part needed for my repair that is not available til July, they're going to go ahead and fix the front end now, and the rear later..(sucks) but at least I'll have the car back soon. Built some experimental big ID MAF tubes today, so the whole project should be interesting..Cool air and more of it!

wstar · 06-08-2009, 03:13 PM

Quote:

Originally Posted by Modshack

Built some experimental big ID MAF tubes today, so the whole project should be interesting..Cool air and more of it!

You're probably more aware than I am, but just in case: beware larger MAF tubes giving false MAF readings. The stock MAF sensors are calibrated for a given tube diameter, and they will read artificially low airflow numbers in a larger tube (which results in the engine running lean and not realizing it, because the MAF input is wrong).

I think the wideband O2's in our headers will correct for this at idle/normal engine speeds, but maybe not at WOT. It may be moot anyways if our ECU's ability to predict knock and adjust timing in both directions is as good as some are claiming (e.g. in the threads about the engine adapting to higher octane fuel - in theory this is like an artificial boost in air density that the ECU can't directly see, which is a lot like dropping the fuel octane from a knock-avoidance point of view).

I don't really know anything definitive about this whole subject on our cars, but based on previous experience (LS1's from circa 10 years ago), you don't want to lie to the ECU about the MAF data, which is what a wider tube with stock sensor effectively does.

Modshack · 06-08-2009, 06:24 PM

Quote:

Originally Posted by wstar

You're probably more aware than I am, but just in case: beware larger MAF tubes giving false MAF readings. The stock MAF sensors are calibrated for a given tube diameter, and they will read artificially low airflow numbers in a larger tube (which results in the engine running lean and not realizing it, because the MAF input is wrong).

.

Well aware Wstar, but thanks. I've been building Bigger MAFs for Audi and VW turbos for 7-8 years now so I've learned some things along the way about matching fuel trims, Fuel pressure adjustments, Tube ID's etc. etc...

FYI here are a few MAF ID's

Stock 2.33"
Stillen 2.36" Estimate Based on typical wall thicknes of the 2.5" tube they use
Nismo 2.61" Estimate Based on ID of the 2.75" OD tube

I'm going to start out with these at 2.5" and see where it goes. I also have a venturi machined in at the inlet which tends to accelerate the flow a bit and bump the MAF output. The air will transition from a 3" filter flange to the venturi and 2.5" ID then expand a bit into a smooth 2.75 hose to the TB. This should enhance flow and volume.

A few tenths does make a difference in Surface area and MAF output. This car runs rich stock. My Scangauge reports a steady -8 to 9% rich correction (long term fuel trims in closed loop) unless driven hard and it'll drop to -4% for awhile. Typically when you nail the throttle and transition to open loop, these corrective factors get added to the pre-built open loop fuel map. The closer you can get to Zero, the closer you are to the Nissan spec'd preMapped fuel curves. There's enough headroom there to lean it out a bit and try to get the trims to 0%. These ECU's also seem to have a good adaptation range from what i've seen. I doubt the Nismo would go to that ID unless the car could adapt safely to it. Without having an adjustable Fuel pressure regulator, I'm just going to play with the air for now. Given that adjustability you could go bigger. Here's a little theory from my MoFo (Mass Oxygen Flow Optimizer!) page: Modshack | Stage 2 MOFO (BAMM)

wstar · 06-08-2009, 07:07 PM

Good info there, thanks

semtex · 06-08-2009, 01:53 PM

Those look sweet.

CBRich · 06-12-2009, 09:36 PM

Looks like it should fit quite well.

ZforMe · 06-12-2009, 09:55 PM

Modshack,

Would the idea be to finish fabricating and then develope a kit to sell to forum members (assuming everything works out well)?

Modshack · 06-12-2009, 10:14 PM

Quote:

Originally Posted by ZforMe

Modshack,

Would the idea be to finish fabricating and then develope a kit to sell to forum members (assuming everything works out well)?

We'll see!

370NUTZ · 06-14-2009, 09:18 AM

Quote:

Originally Posted by NewlyIMPORTed

so i decided to bite the bullet and buy the ultra long tube intake for my 370 with my graduation money. well i was a little upset that i just compulsively went to forged and ordered it. so i get it back and after the bogging from the ecu reseting i didn't really notice a change. well i drove it the next day and i def noticed the change it took a day to break in but the torque and sound diff. is huge. so i thought i would share my experience for those contemplating the idea. well worth the the 549 without install. and thanks to forged for helping me out.

Any issue at all with hydrolock?

06-08-2009, 11:42 AM	#2 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	^See post 14. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-08-2009, 11:44 AM	#3 (permalink)
ZforMe Base Member Join Date: Jan 2009 Location: Memphis TN Posts: 238 Drives: 370Z Sport Auto PG Rep Power: 17	Apparently I never completed the first page of this thread, MY BAD! __________________ 13.369 @ 102.73 Bone Stock. BERK HFC's installed 5/14/09 @ 1490miles, 13.212 @ 106.15. Cobb Post MAF Hoses installed 3/20/10 @ 5,043miles, future: FI exhaust with 18" res and s/s cans.

06-08-2009, 01:16 PM	#5 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	Glad you posted that pic, Modshack. The slots aren't nearly as low as I had pictured them in my head. Yeah I'm not worried about heat coming off the road anymore. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-08-2009, 01:28 PM	#6 (permalink)
ZforMe Base Member Join Date: Jan 2009 Location: Memphis TN Posts: 238 Drives: 370Z Sport Auto PG Rep Power: 17	I still want to see the snorkel idea tested. LOL __________________ 13.369 @ 102.73 Bone Stock. BERK HFC's installed 5/14/09 @ 1490miles, 13.212 @ 106.15. Cobb Post MAF Hoses installed 3/20/10 @ 5,043miles, future: FI exhaust with 18" res and s/s cans.

06-08-2009, 07:07 PM	#10 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	Good info there, thanks __________________ 7AT Track Car! Journal thread / Car setup details

06-08-2009, 11:57 AM	#4 (permalink)
CBRich A True Z Fanatic Join Date: Apr 2009 Location: SC Posts: 2,464 Drives: 370Z Rep Power: 544	I am not thinking the heat is the issue as much as getting good air flow to the intakes. Being trapped behind the bumper limits the airflow and having the ducts directly in front of them would be the optimal solution. But if we can force air up behind the bumper with ducts that should also work great.

06-08-2009, 01:53 PM	#11 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	Those look sweet. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-12-2009, 09:36 PM	#12 (permalink)
CBRich A True Z Fanatic Join Date: Apr 2009 Location: SC Posts: 2,464 Drives: 370Z Rep Power: 544	Looks like it should fit quite well.

06-12-2009, 09:55 PM	#13 (permalink)
ZforMe Base Member Join Date: Jan 2009 Location: Memphis TN Posts: 238 Drives: 370Z Sport Auto PG Rep Power: 17	Modshack, Would the idea be to finish fabricating and then develope a kit to sell to forum members (assuming everything works out well)? __________________ 13.369 @ 102.73 Bone Stock. BERK HFC's installed 5/14/09 @ 1490miles, 13.212 @ 106.15. Cobb Post MAF Hoses installed 3/20/10 @ 5,043miles, future: FI exhaust with 18" res and s/s cans.

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