Big Gulp = CAI? Not so much.. - Page 7

JSH · 10-05-2023, 11:12 AM

Quote:

Originally Posted by RobZL1

I dunno. They advertise it as a 5" OD intake on their website. On my car, the diameter certainly looks only about an inch bigger than my 4.25"-ish OD on my 103TB. Mine is not a 2 inch difference, for certain. Maybe you got an oddball prototype on accident.

If it wasn't for the fact that the air filter opening is 6 in, I would say that perhaps my shop used a bigger than normal inlet. Of Course it could be that the shop used a larger than normal air filter and inlet outlet pipe. Whatever you want to call it
I mean I just put a 6-in turbo inlet wire screen cover on it so I don't know what else I can say other than the fact that it's 6 in or 152mm reducing to 112mm.

Joshinator99 · 10-05-2023, 12:00 PM

Gents

What matters is I.D. not O.D. and the BG necks down to 4.5” through the MAF as Jason posted much earlier in this thread. I didn’t believe him so I pulled my filter off and measured it myself with my calipers. It is indeed 4.5” internal diameter. So having the 6” filter is all well and good, but the intake is only as strong as it’s weakest link. I think there is room for improvement at higher power levels.

JSH · 10-05-2023, 12:07 PM

Quote:

Originally Posted by Joshinator99

Gents

What matters is I.D. not O.D. and the BG necks down to 4.5” through the MAF as Jason posted much earlier in this thread. I didn’t believe him so I pulled my filter off and measured it myself with my calipers. It is indeed 4.5” internal diameter. So having the 6” filter is all well and good, but the intake is only as strong as it’s weakest link. I think there is room for improvement at higher power levels.

I can see a larger diameter filter ID, say 8", but it would still have to eccentrically or concentrically reduce to maf and tb ID. I don't know how you would design something better for the same area

RobZL1 · 10-05-2023, 12:25 PM

Yeah, i understand ID is what matters. Just was comparing on OD, as im pretty sure that was apples to apples with what JSH was looking at.

I had no idea the maf cross section was 4.5", btw.

I agree with the weakest link, but will say that due to some research with air compressor intakes, I know that even with a small orifice or a neck down in diameter, the larger pipe nets more intake flow. Friction factors and mass flow area are in play I imagine.

ZL1Atlanta · 10-05-2023, 12:32 PM

Quote:

Originally Posted by JSH

I can see a larger diameter filter ID, say 8", but it would still have to eccentrically or concentrically reduce to maf and tb ID. I don't know how you would design something better for the same area

This is our current prototype with a 5.5" ID from bellmouth to TB. We are going to play with bellmouth size, and as mentioned, blocking the bellmouth in so most of the air is pulled from the headlight opening rather than the engine bay. As soon as we put it on the throttle body started to get forced closed.

JSH · 10-05-2023, 12:46 PM

Quote:

Originally Posted by ZL1Atlanta

This is our current prototype with a 5.5" ID from bellmouth to TB. We are going to play with bellmouth size, and as mentioned, blocking the bellmouth in so most of the air is pulled from the headlight opening rather than the engine bay. As soon as we put it on the throttle body started to get forced closed.

Are you going to dyno this setup?
You're pulling so much more air than the rest of us making your situation unique. Btw, one of my insulated intercooler lines runs thru the intake route just behind the headlight and the air blew the insulation off of it on my first jaunt with the ram air headlight mods. It's getting more air now.

I'm now wondering if the RF is useless.

ZL1Atlanta · 10-05-2023, 01:03 PM

Quote:

Originally Posted by JSH

Are you going to dyno this setup?
You're pulling so much more air than the rest of us making your situation unique. Btw, one of my insulated intercooler lines runs thru the intake route just behind the headlight and the air blew the insulation off of it on my first jaunt with the ram air headlight mods. It's getting more air now.

I'm now wondering if the RF is useless.

I doubt we'll dyno it. It was swapped at the track and gained 1.5 psi over the 4.5" ID setup, so that is enough for us. They did have to change the tune some for it.

I don't think the RF is useless in most applications. I'm fairly certain I would suck a stock air tube closed with this setup now. Lol

KingLT1 · 10-05-2023, 01:37 PM

Quote:

Originally Posted by JSH

You're just arguing. The opening on the air filter and tube to the throttle body are 6-in diameter. I've measured it 10 times so I don't understand what you're saying. The numbers I have above are exactly what it is. Some things about the car are complicated but this one isn't

You must be measuring from behind the balls.

RobZL1 · 10-05-2023, 04:55 PM

Jason, off topic- are your coil packs mounted on the firewall, I assume? Looks clean.

ZL1Atlanta · 10-05-2023, 04:56 PM

Quote:

Originally Posted by RobZL1

Jason, off topic- are your coil packs mounted on the firewall, I assume? Looks clean.

Thanks and yes they are.

JSH · 10-05-2023, 06:15 PM

Quote:

Originally Posted by KingLT1

You must be measuring from behind the balls.

Tuners always have to be right

JSH · 10-10-2023, 03:40 PM

Using the second tune for this setup, the boost increased 1# to 20.1 and the total manifold pressure to 32 (+1#). So, the air intake mods (ram air, headlight backing, bellmouth, RF area seals) made since my last run in April 2023 have done some good. I plan to make some hits at the strip on the 20th, and we'll see.

SOCAL.M6.ZLE · 10-10-2023, 04:26 PM

Quote:

Originally Posted by JSH

Using the second tune for this setup, the boost increased 1# to 20.1 and the total manifold pressure to 32 (+1#). So, the air intake mods (ram air, headlight backing, bellmouth, RF area seals) made since my last run in April 2023 have done some good. I plan to make some hits at the strip on the 20th, and we'll see.

Thats great feedback JSH... I am taking a better look at my RF set up now also...

CamOnlyJabroni · 10-10-2023, 05:43 PM

Quote:

Originally Posted by ZL1Atlanta

This is our current prototype with a 5.5" ID from bellmouth to TB. We are going to play with bellmouth size, and as mentioned, blocking the bellmouth in so most of the air is pulled from the headlight opening rather than the engine bay. As soon as we put it on the throttle body started to get forced closed.

That looks pretty slick. Need a gigantic cone filter option for street usage. I ran a airaid track day filter on my old four cylinder car but they don’t make one big enough for this application. Lethal Performance sells something similar. Link below.

https://www.lethalperformance.com/wh...9-0017-rc.html

10-05-2023, 12:00 PM	#86
Joshinator99 Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 4,879	Gents What matters is I.D. not O.D. and the BG necks down to 4.5” through the MAF as Jason posted much earlier in this thread. I didn’t believe him so I pulled my filter off and measured it myself with my calipers. It is indeed 4.5” internal diameter. So having the 6” filter is all well and good, but the intake is only as strong as it’s weakest link. I think there is room for improvement at higher power levels. __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion *1059 WHP/944 WTQ, 9.48@150*

10-05-2023, 12:25 PM	#88
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,297	Yeah, i understand ID is what matters. Just was comparing on OD, as im pretty sure that was apples to apples with what JSH was looking at. I had no idea the maf cross section was 4.5", btw. I agree with the weakest link, but will say that due to some research with air compressor intakes, I know that even with a small orifice or a neck down in diameter, the larger pipe nets more intake flow. Friction factors and mass flow area are in play I imagine. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // Elite Ultra CC // BMR MM Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

10-05-2023, 04:55 PM	#93
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,297	Jason, off topic- are your coil packs mounted on the firewall, I assume? Looks clean. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // Elite Ultra CC // BMR MM Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

10-10-2023, 03:40 PM	#96
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,629	Using the second tune for this setup, the boost increased 1# to 20.1 and the total manifold pressure to 32 (+1#). So, the air intake mods (ram air, headlight backing, bellmouth, RF area seals) made since my last run in April 2023 have done some good. I plan to make some hits at the strip on the 20th, and we'll see. __________________ '20 ZL1 1LE A10. LME 390, E2650, FBO, 100 oct. 1116/967. 1.35/9.25/151 at 3500 ft. (only one pass) 15" conversion/MT ET Street R 325/50R15.

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