Do I really need a BIG GULP ???

SOCAL.M6.ZLE · 07-17-2022, 09:59 PM

Hey team... I am planning the budget for my Phase.2 build (see below in my sig) Planning to max out my stock low end fueling (JMS only) and have heard I should be good to around 750rwhp. With that said... If I port the blower, and a pinch more boost and a cam... do I really need a Big Gulp this round? I assume it would only hold me back if I added a low end kit and wanted to hit 800+ correct?

dbs1 · 07-18-2022, 12:16 AM

I'm thinking you might, but just an FYI...I was making 688 rwhp at 45% ethanol and went to 60%, using a jms unit thinking I'd be ok if it went to 700+. Nope, leaned out 2 cylinders and $14k later...

AZIROC · 07-18-2022, 12:34 AM

Quote:

Originally Posted by dbs1

I'm thinking you might, but just an FYI...I was making 688 rwhp at 45% ethanol and went to 60%, using a jms unit thinking I'd be ok if it went to 700+. Nope, leaned out 2 cylinders and $14k later...

Did it have the lean condition cause of the switch to E and not enough fuel *pressure*?

I've veen debating switching to E but I hear alot of stories of blown engines cause of going to lean.

dbs1 · 07-18-2022, 12:45 AM

She was good at several events at 48%. Should be better at 60%, right? Nope. Cool weather and good da and kaboom. 17% lower with the usual stuff and it looks like injectors on those 2 cylinders couldn't keep up. Ugh!

ZLRob · 07-18-2022, 02:03 AM

If I remember right I think it's been confirmed that the OE intake is good up to 800 HP. The big gulp is nothing but noise up until that point.

Z OH 6 · 07-18-2022, 05:22 AM

Standard Rotofab is good up to about 750whp, it can't hurt to add a Big Gulp below that point as long as the car is tuned for it, but it may not offer much benefit either until after 750whp.

Smokin19 · 07-18-2022, 06:27 AM

Porting the blower and adding a 103 tb while having headers with high flow cats, then you want to restrict how much incoming air into the engine makes no sense. The more air you can pass thru the engine unrestricted the better your performance will be, this is mechanics 101.

Dan82679 · 07-18-2022, 06:39 AM

Yes big gulp is needed.

laynlo15 · 07-18-2022, 06:45 AM

I ran my original Rotofab to about 770. Hurt the motor and replaced the short block and that that time we went to the big gulp and made 850 plus. So I think you can go to at least 775 or maybe 800 max. Beyond that and according to Mike at Rotofab you really don't need it till your at that level

*radz28* · 07-18-2022, 08:49 AM

You're going to be tuning anyways, so why not? You could sell your standard RF and put that toward a new one. You'll have to figure out how to get one here in CA. A lot of people say it's not worth it at that power. Maybe they're right, and you'll only pick up a handful or two Bald Eagles, but if you're going to a 103 - why not get a BG? I hear tuning (idle, I guess) can be a bit of a pain, but we didn't experience that. We did have to tune for it, after switching from the standard, so it seems to me there is something to be had, even for mild mods' like us.

My vote - if it's in your budget - why not? JMHO.

Z OH 6 · 07-18-2022, 09:10 AM

Quote:

Originally Posted by radz28

You're going to be tuning anyways, so why not? You could sell your standard RF and put that toward a new one. You'll have to figure out how to get one here in CA. A lot of people say it's not worth it at that power. Maybe they're right, and you'll only pick up a handful or two Bald Eagles, but if you're going to a 103 - why not get a BG? I hear tuning (idle, I guess) can be a bit of a pain, but we didn't experience that. We did have to tune for it, after switching from the standard, so it seems to me there is something to be had, even for mild mods' like us.

My vote - if it's in your budget - why not? JMHO.

That's pretty much what I did at 700whp. I figured I might as well do it now, in case I decide to do more mods later.

SJFGTO · 07-18-2022, 09:22 AM

I think at the level you are planning your engine can efficiently handle and use increased airflow. As noted, you will be tuning your engine anyway, so the Big Gulp makes perfect sense.

KingLT1 · 07-18-2022, 09:46 AM

The Big Gulp isn't worth it until you at least port the supercharger and run a 103mm tb. If you put it on a stock supercharger and throttle body then yea it's not going to do much being there is a restriction upstream. I don't really base stuff off of a arbitrary power number. It has more to do with the setup and combination of parts.

musclesbmf · 07-18-2022, 09:56 AM

I'm at 855 to the wheels using a JLT intake for a point of reference. The intake tube visually matches the diameter of a Katech 103. So a "regular" intake doesn't seem to be hurting my situation.

Mark

07-17-2022, 09:59 PM	#1
SOCAL.M6.ZLE Having FUN in the SUN... Drives: 2022 M6 ZL1 1LE Join Date: Jan 2022 Location: San Diego CA Posts: 1,052	Do I really need a BIG GULP ??? Hey team... I am planning the budget for my Phase.2 build (see below in my sig) Planning to max out my stock low end fueling (JMS only) and have heard I should be good to around 750rwhp. With that said... If I port the blower, and a pinch more boost and a cam... do I really need a Big Gulp this round? I assume it would only hold me back if I added a low end kit and wanted to hit 800+ correct? __________________ 2022 M6 ZLE: Katech CNC Ported Blower + Ported Heads + 103mm TB + Oil Pump + C5R Chain + Valve Covers + Coil Relocation TSP VVT and DoD Delete Covers + LME Chain Guide + DSX Billet Lid + ATI Damper + 9.17" Lower + 2.4" Upper + MM Wild CC Coated ARH + AWE Touring + Magnaflow Center X + E85 + MSD Coils + Banks iDash + JMS Booster + Synergy Fender Tank ALL the RED Rear End BMR Goodies + JRE Terminator Cam Package + Remote Tuning and Moral Support from TED @ JRE BMR Motor Mounts + DMS Front HX + FIC 30's + APEX SM.10's + 305/345 R888R's = 770rwhp 785rwtq @E50 13.5psi

07-18-2022, 02:03 AM	#5
ZLRob Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 437	If I remember right I think it's been confirmed that the OE intake is good up to 800 HP. The big gulp is nothing but noise up until that point. __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% Pulley, NGK HR7 Ruthenium spark plugs, Katech Oil Pump, LME tensioner, DOD delete, Cam, MPI lid, Soler ported 87mm (91mm effective) TB, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, Borla X pipe, AFe NPP exhaust, Black Widow Angry Housewife/ Venom 250 mufflers, BMR engine mounts, Banks iDash, Lithium Battery, Course Motorsports phone mount, AEM X- Series, HP Tuners, JMS, E85, 13.6 psi 737 HP/ 779 TQ

07-18-2022, 06:27 AM	#7
Smokin19 Drives: 19' ZL1 A10, w/pdr Join Date: Sep 2014 Location: S.W. ohio Posts: 1,551	Porting the blower and adding a 103 tb while having headers with high flow cats, then you want to restrict how much incoming air into the engine makes no sense. The more air you can pass thru the engine unrestricted the better your performance will be, this is mechanics 101. __________________ BTR Stg II cam w/ 38% fuel lobe, ARH 2" headers into 3" w/cats, AWE Touring, Kong X port, Weapon X triple ht exchangers, NW 103, Rotofab big gulp, DSX lowside, TCM tune, BMR Lockout, Mustang dyno 720 rwhp, 634 rwtq on 93 pump.

07-18-2022, 06:45 AM	#9
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	I ran my original Rotofab to about 770. Hurt the motor and replaced the short block and that that time we went to the big gulp and made 850 plus. So I think you can go to at least 775 or maybe 800 max. Beyond that and according to Mike at Rotofab you really don't need it till your at that level __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

07-18-2022, 08:49 AM	#10
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,198 View My Garage	You're going to be tuning anyways, so why not? You could sell your standard RF and put that toward a new one. You'll have to figure out how to get one here in CA. A lot of people say it's not worth it at that power. Maybe they're right, and you'll only pick up a handful or two Bald Eagles, but if you're going to a 103 - why not get a BG? I hear tuning (idle, I guess) can be a bit of a pain, but we didn't experience that. We did have to tune for it, after switching from the standard, so it seems to me there is something to be had, even for mild mods' like us. My vote - if it's in your budget - why not? JMHO. __________________ '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

07-18-2022, 12:16 AM	#2
dbs1 Drives: 2017 ZL1 Join Date: Aug 2020 Location: Lakeside, Az Posts: 491	I'm thinking you might, but just an FYI...I was making 688 rwhp at 45% ethanol and went to 60%, using a jms unit thinking I'd be ok if it went to 700+. Nope, leaned out 2 cylinders and $14k later...

07-18-2022, 12:45 AM	#4
dbs1 Drives: 2017 ZL1 Join Date: Aug 2020 Location: Lakeside, Az Posts: 491	She was good at several events at 48%. Should be better at 60%, right? Nope. Cool weather and good da and kaboom. 17% lower with the usual stuff and it looks like injectors on those 2 cylinders couldn't keep up. Ugh!

07-18-2022, 05:22 AM	#6
Z OH 6 Drives: 2021 Red Hot ZL1 Join Date: Sep 2020 Location: Gapplebees Posts: 3,085	Standard Rotofab is good up to about 750whp, it can't hurt to add a Big Gulp below that point as long as the car is tuned for it, but it may not offer much benefit either until after 750whp.

07-18-2022, 06:39 AM	#8
Dan82679 Drives: 2017 ZL1 Join Date: Jul 2019 Location: NJ Posts: 237 View My Garage	Yes big gulp is needed.

07-18-2022, 09:22 AM	#12
SJFGTO Oh Oh it's Friday Night! Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018 Location: Walton Woods Posts: 1,061	I think at the level you are planning your engine can efficiently handle and use increased airflow. As noted, you will be tuning your engine anyway, so the Big Gulp makes perfect sense. __________________ 2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm Four that wanna own me Two that wanna stone me One says she's a friend of mine...

07-18-2022, 09:46 AM	#13
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,799	The Big Gulp isn't worth it until you at least port the supercharger and run a 103mm tb. If you put it on a stock supercharger and throttle body then yea it's not going to do much being there is a restriction upstream. I don't really base stuff off of a arbitrary power number. It has more to do with the setup and combination of parts. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

07-18-2022, 09:56 AM	#14
musclesbmf Drives: 2020 ZL1 1LE A10 Join Date: Feb 2021 Location: Lutz, FL Posts: 78	I'm at 855 to the wheels using a JLT intake for a point of reference. The intake tube visually matches the diameter of a Katech 103. So a "regular" intake doesn't seem to be hurting my situation. Mark

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