JLT Performance CAI Test Fit, No Rain Guard! - Page 2

Megahurtz · 07-03-2025, 09:48 AM

I think it will be a flow restriction over the Big Gulp design at WOT. It does look like it might have an advantage at lower RPM's for IAT's. But at full tilt on ZL1's pushing the blower (800+ HP), I suspect a drop in flow vs RFBG and less peak HP.

*Joshinator99* · 07-03-2025, 04:35 PM

Quote:

Originally Posted by Megahurtz

I think it will be a flow restriction over the Big Gulp design at WOT. It does look like it might have an advantage at lower RPM's for IAT's. But at full tilt on ZL1's pushing the blower (800+ HP), I suspect a drop in flow vs RFBG and less peak HP.

Funny you mention that… I was actually debating not using the air filter shroud at all for that reason. I’m thinking take advantage of the better tube and much bigger air filter over the RFBG, and that’s it.

CamOnlyJabroni · 07-06-2025, 09:51 PM

The metal heat shield of the RotoFab doesn’t affect anything IMO. Not even a metal tube when actually driving the car down the road. The custom 5” I had made for my setup is the only CAI I have ran on any vehicle that actually matches the air intake temp with ambient temp.

RobZL1 · 07-07-2025, 11:34 PM

Quote:

Originally Posted by CamOnlyJabroni

The metal heat shield of the RotoFab doesn’t affect anything IMO. Not even a metal tube when actually driving the car down the road. The custom 5” I had made for my setup is the only CAI I have ran on any vehicle that actually matches the air intake temp with ambient temp.

That's nice. I really dig that! Looks awesome and has a smooth bend, too.

SOCAL.M6.ZLE · 07-08-2025, 01:42 AM

Quote:

Originally Posted by CamOnlyJabroni

The metal heat shield of the RotoFab doesn’t affect anything IMO. Not even a metal tube when actually driving the car down the road. The custom 5” I had made for my setup is the only CAI I have ran on any vehicle that actually matches the air intake temp with ambient temp.

Damn that looks good! Well done!

KingLT1 · 07-08-2025, 10:00 AM

Quote:

Originally Posted by Megahurtz

I think it will be a flow restriction over the Big Gulp design at WOT. It does look like it might have an advantage at lower RPM's for IAT's. But at full tilt on ZL1's pushing the blower (800+ HP), I suspect a drop in flow vs RFBG and less peak HP.

Quote:

Originally Posted by CamOnlyJabroni

The metal heat shield of the RotoFab doesn’t affect anything IMO. Not even a metal tube when actually driving the car down the road. The custom 5” I had made for my setup is the only CAI I have ran on any vehicle that actually matches the air intake temp with ambient temp.

CamOnlyJabroni · 07-08-2025, 10:50 PM

Quote:

Originally Posted by RobZL1

That's nice. I really dig that! Looks awesome and has a smooth bend, too.

Quote:

Originally Posted by SOCAL.M6.ZLE

Damn that looks good! Well done!

Thanks. Had it made since there isn’t really a full 5” option for a 112tb setup.

*radz28* · 07-09-2025, 08:07 AM

That's a B@D@$$ intake! Was it a PITA to tune with the 112?

*Joshinator99* · 07-09-2025, 11:44 AM

I suspect the much larger filter on the JLT is going to pay dividends vs the RFBG filter… the surface area of the JLT element is much bigger.

CamOnlyJabroni · 07-09-2025, 02:30 PM

Quote:

Originally Posted by radz28

That's a B@D@$$ intake! Was it a PITA to tune with the 112?

I was told the MAF signal wasn’t any worse than the RotoFab but the car is tuned in SD.

*Joshinator99* · 07-09-2025, 07:26 PM

Quote:

Originally Posted by CamOnlyJabroni

I was told the MAF signal wasn’t any worse than the RotoFab but the car is tuned in SD.

No surprise since the MAF sample tube diameter was unchanged vs the BG.

Megahurtz · 07-10-2025, 08:40 AM

Quote:

Originally Posted by Joshinator99

I suspect the much larger filter on the JLT is going to pay dividends vs the RFBG filter… the surface area of the JLT element is much bigger.

I think this could be true on the dyno with the hood opened...likely how it will or was tested. But if you look at where it can pull in fresh air, that path is smaller than the RFBG and I think this will cause a drop in airflow vs the RFBG with the hood down when at higher RPM.

I'd love to see the dyno hood opened vs hood closed on the JLT design.

Dynamical · 07-10-2025, 02:09 PM

Quote:

Originally Posted by Megahurtz

I think this could be true on the dyno with the hood opened...likely how it will or was tested. But if you look at where it can pull in fresh air, that path is smaller than the RFBG and I think this will cause a drop in airflow vs the RFBG with the hood down when at higher RPM.

I'd love to see the dyno hood opened vs hood closed on the JLT design.

This right here. I wanna start seeing Dyno tests with hoods closed

*Joshinator99* · 07-10-2025, 06:14 PM

Quote:

Originally Posted by Megahurtz

I think this could be true on the dyno with the hood opened...likely how it will or was tested. But if you look at where it can pull in fresh air, that path is smaller than the RFBG and I think this will cause a drop in airflow vs the RFBG with the hood down when at higher RPM.

I'd love to see the dyno hood opened vs hood closed on the JLT design.

Big power cars like @ZL1Atlanta don’t run shrouds at all so my thinking is that if you just run the better JLT tube and bigger JLT filter one should come out ahead of the RFBG. Maybe I’m wrong lol… been known to happen.

07-03-2025, 09:48 AM	#15
Megahurtz Snackbar Tuning Drives: 2023 SGM ZL1 Join Date: Oct 2016 Location: Florida Posts: 1,513	I think it will be a flow restriction over the Big Gulp design at WOT. It does look like it might have an advantage at lower RPM's for IAT's. But at full tilt on ZL1's pushing the blower (800+ HP), I suspect a drop in flow vs RFBG and less peak HP. __________________ GM Gen V Calibrator

07-06-2025, 09:51 PM	#17
CamOnlyJabroni Drives: 19’ ZL1 A10 / 16’ C7Z M7 Join Date: Apr 2021 Location: Ft.Wayne, IN Posts: 326	The metal heat shield of the RotoFab doesn’t affect anything IMO. Not even a metal tube when actually driving the car down the road. The custom 5” I had made for my setup is the only CAI I have ran on any vehicle that actually matches the air intake temp with ambient temp. Attached Images

07-09-2025, 08:07 AM	#22
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,789 View My Garage	That's a B@D@$$ intake! Was it a PITA to tune with the 112? __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

07-09-2025, 11:44 AM	#23
Joshinator99 Moderator Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 6,201	I suspect the much larger filter on the JLT is going to pay dividends vs the RFBG filter… the surface area of the JLT element is much bigger. __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)

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