Intake Air Temperatures

280z/300zx · 02-24-2010, 04:33 PM

Quote:

Originally Posted by Zsteve

go to the DIY section and look for Modshacks air vent diy, its a good complete job.

No, I've seen the DIY for Modshack. I want to see pics of the guy I quoted KEVTEX. I want to see pics of the cobb silicone hoses with the stock air box. thanks though.

KEVTEX · 02-25-2010, 12:34 AM

There is not much to look at with the Cobb silicone tubes as they are just round tubes that replace the factory corrugated ones. The fang block off plates were removed to make room for Blinder 27 laser jammer transceivers that I attached to the aluminum bumper. I just left the fang area open to let in more air.

Zsteve · 02-25-2010, 10:32 AM

Quote:

Originally Posted by KEVTEX

There is not much to look at with the Cobb silicone tubes as they are just round tubes that replace the factory corrugated ones. The fang block off plates were removed to make room for Blinder 27 laser jammer transceivers that I attached to the aluminum bumper. I just left the fang area open to let in more air.

so how are those jammers working? Do they jam all the freqs? And can the cops tell if you are using one?

280z/300zx · 02-25-2010, 01:15 PM

notice any power increase with the tubes or better throttle response?

Also does removing the fang block out plates do anything to aero effects of the car? Allowing more air sounds like a good idea as long as it doesn't make the car less stable at higher speeds.

KEVTEX · 02-25-2010, 03:02 PM

The available reviews on laser jammers were favorable on the Blinder 27. I don't have any way to tell how well they work. Cops won't get a reading of the speed.
The Cobb tubes looked like they would have less flow restriction than the corrugated factory ones. Not enough difference for me to be able to feel it. No high speed issues as of yet. Letting more air into the bumper area shouldn't affect handling as the bottom is still covered with the plastic panel under the engine.

ZPirate · 02-25-2010, 03:41 PM

Thanks for the pictures of the Cobb silicone intake tubes. I just purchased a set, but haven't received them yet.

Modshack · 02-25-2010, 05:39 PM

Quote:

Originally Posted by ZPirate

Thanks for the pictures of the Cobb silicone intake tubes. I just purchased a set, but haven't received them yet.

and we're gonna hook em up to these custom cut MAF tubes and my CAI system! Joe call ya about the tubes arriving?

ZPirate · 02-25-2010, 08:56 PM

Man that looks nice Steve!

No I didn't hear from Joe today. I'll check with him on Saturday to see if they came in.

roplusbee · 02-26-2010, 03:02 AM

Woah! Please tell me you are going to do a writeup with that also. That may be the big kicker right there, depending on cost.

Modshack · 02-26-2010, 09:32 AM

Quote:

Originally Posted by roplusbee

Woah! Please tell me you are going to do a writeup with that also. That may be the big kicker right there, depending on cost.

Preliminary design and write-up was here: CAI: Modshack Experimental.....>

From that thread:

Quote:

On the MAF: The diameter of the tubing at the MAF determines the velocity of the Air flow over the MAF. The MAF controls the fuel signal with the 02 sensor sending corrective info to the ECU. Since The stock Z runs rich, I am constantly seeing a -9 to 10% correction on the long term (Partial throttle) fuel trims. You can open up that tube "slightly", drop the velocity therefore reducing the MAF signal while upping the volume, and therefore bring the fuel trims closer to 0% where the car will make more power. It's a balancing act to do it right. Trust me, I've done a LOT of experimenting on this with the Audi's and have Hundreds of thousands of test miles on the Tubes I build for them. . Very careful tuning of the pipe diameter can result in real gains as long as you don't go to the extreme of needing to alter the fueling. If you go too big you will need to. Lean cars make more power than fat cars from the fueling perspective. Ideal A/F ratios are around 12.5:1. Z's with a full compliment of exhaust and intake mods still run richer than that per Semtex's dynos (11.8:1 or so). This is why tuning gets more power...It brings the car up to a better A/F ratio for power. Corrections will happen automatically with regular ECU adaptation. The stock MAF tubes are 2.34" in ID. As best as I can determine the Stillens are around 2.37" which is a 2.5% difference in surface area! More air + less fuel = more power. If you want to study up on some of the reasoning, check out my page here:
http://www.modshack.info/bamm.htm
My initial Guestimate of a 2.5" ID seems pretty close. Just went out and ran the car for 40 miles and the long term fuel trims seem to average out to 0, + or - a few % points of correction. (BTW, The long term fuel trims or Partial throttle adjustment sets at the 20 mile mark after an ECU reset, then continues to adjust based on input from there on). 0% correction means the ECU is happy with the fuel mix and doesn't have to alter it to bring it into spec. A + number is a lean correction, a Minus is a rich correction. I need to put a few more miles on to see if this LTF % holds in that range. If it goes lean, I'll just cut some tubes a tad smaller.. It's all an experiment at this point..

Zsteve · 02-26-2010, 12:50 PM

Steve do you need to tune after installing the new MAF? I had put one put on my TT after it was tuned and I guess cause it was a bigger MAF it caused back firing and just didnt do good.

Modshack · 02-26-2010, 01:39 PM

Quote:

Originally Posted by Zsteve

Steve do you need to tune after installing the new MAF? I had put one put on my TT after it was tuned and I guess cause it was a bigger MAF it caused back firing and just didnt do good.

No...these are cut to work within the ECU self adjusting parameters which has proven pretty flexible.. Not radical at all..

The reason you needed a new MAF on your TT was because the old one was failing. All of a sudden you were asking for 40 more HP and the tired MAF couldn't supply enough of a signal to keep the fueling correct. They are particularly fragile on VW/Audi cars. On those I actually go up 12-15% in size, but up the fuel pressure to account for the lower MAF signal. Read the link in the quote above..

ZforMe · 02-27-2010, 01:44 PM

Anyone know the ID of the Cobb silicon tubes? Is it bigger than the corrugated? I saw that Modshack used custom 2.75" which is bigger than the 2.5' stockers, but I haven't seen any dimensions of the Cobb tubes.

Modshack · 02-27-2010, 02:18 PM

Quote:

Originally Posted by ZforMe

Anyone know the ID of the Cobb silicon tubes? Is it bigger than the corrugated? I saw that Modshack used custom 2.75" which is bigger than the 2.5' stockers, but I haven't seen any dimensions of the Cobb tubes.

Actually I just got my hands on a set this morning (Zpitrates)...... The MAF tubes I cut above had an OD of 2.75" and the Cobb's fit them snugly as they do the stock parts (below). The TB is also 2.75, so 2.75 it is!

ZforMe · 02-28-2010, 02:04 PM

Awesome, Thanks!

02-25-2010, 03:41 PM	#21 (permalink)
ZPirate Track Member Join Date: Dec 2008 Location: Greenville, NC Posts: 792 Drives: 09' 370Z & 03' 350Z Rep Power: 18	Thanks for the pictures of the Cobb silicone intake tubes. I just purchased a set, but haven't received them yet. __________________ 2003 Daytona Blue 350Z Touring/Nismo 2009 Platinum Graphite 370Z Touring/Sport (Sold) 2009 BMW 135i/Dinan Stage 2 software upgrade/M3 suspension piecies/Koni Sports/ETS FMIC/Alufelgen SF-71 wheels

02-25-2010, 08:56 PM	#23 (permalink)
ZPirate Track Member Join Date: Dec 2008 Location: Greenville, NC Posts: 792 Drives: 09' 370Z & 03' 350Z Rep Power: 18	Man that looks nice Steve! No I didn't hear from Joe today. I'll check with him on Saturday to see if they came in. __________________ 2003 Daytona Blue 350Z Touring/Nismo 2009 Platinum Graphite 370Z Touring/Sport (Sold) 2009 BMW 135i/Dinan Stage 2 software upgrade/M3 suspension piecies/Koni Sports/ETS FMIC/Alufelgen SF-71 wheels

02-26-2010, 03:02 AM	#24 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 23	Woah! Please tell me you are going to do a writeup with that also. That may be the big kicker right there, depending on cost. __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

02-26-2010, 12:50 PM	#26 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	Steve do you need to tune after installing the new MAF? I had put one put on my TT after it was tuned and I guess cause it was a bigger MAF it caused back firing and just didnt do good. __________________ 2010 LS3 C6 Silver coupe corvette

02-27-2010, 01:44 PM	#28 (permalink)
ZforMe Base Member Join Date: Jan 2009 Location: Memphis TN Posts: 238 Drives: 370Z Sport Auto PG Rep Power: 16	Anyone know the ID of the Cobb silicon tubes? Is it bigger than the corrugated? I saw that Modshack used custom 2.75" which is bigger than the 2.5' stockers, but I haven't seen any dimensions of the Cobb tubes. __________________ 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.

02-25-2010, 12:34 AM	#17 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 16	There is not much to look at with the Cobb silicone tubes as they are just round tubes that replace the factory corrugated ones. The fang block off plates were removed to make room for Blinder 27 laser jammer transceivers that I attached to the aluminum bumper. I just left the fang area open to let in more air.

02-25-2010, 01:15 PM	#19 (permalink)
280z/300zx Track Member Join Date: Feb 2009 Location: Nevada Posts: 689 Drives: 280z, 300zx, Vette Rep Power: 272	notice any power increase with the tubes or better throttle response? Also does removing the fang block out plates do anything to aero effects of the car? Allowing more air sounds like a good idea as long as it doesn't make the car less stable at higher speeds.

02-25-2010, 03:02 PM	#20 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 16	The available reviews on laser jammers were favorable on the Blinder 27. I don't have any way to tell how well they work. Cops won't get a reading of the speed. The Cobb tubes looked like they would have less flow restriction than the corrugated factory ones. Not enough difference for me to be able to feel it. No high speed issues as of yet. Letting more air into the bumper area shouldn't affect handling as the bottom is still covered with the plastic panel under the engine.

02-28-2010, 02:04 PM	#30 (permalink)
ZforMe Base Member Join Date: Jan 2009 Location: Memphis TN Posts: 238 Drives: 370Z Sport Auto PG Rep Power: 16	Awesome, Thanks! __________________ 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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