02-19-2019, 06:00 AM | #1 |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
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Whipple bypass valve?
Has anyone with a Whipple or even Maggie ever experience like a surge around 2500 rpms, which I feel is due to the Whipple bypass valve closing? Seems to occur during normal to light acceleration/pulling out from a stop. It’s like if I gave less or more throttle or short shifted or ran thru this rpm range quicker it doesn't do it, but under light or slow driving and as the rpm goes thru the 2500 rpm range there is just this unsettledness with the engine, a rough spot, then it cleans up and the kind of takes off abruptly. It’s nothing severe or out of control, just a surge, but it hurts some of the daily drive ability.
I reached out to Whipple yesterday asking if there is a different bypass valve or spring I could try or an adjustment to be made. My tuner, CSP says they have done everything they can to smooth this out, it’s just the bypass valve closes rather aggressively. This has been the case since the Whipple was first installed, so it is not due to any recent mods, it has been my only real complaint so far with the setup. I even wondered about some sort of adjustable inline valve for the vacuum hose for the bypass. I did make my hose about 2x longer than what was supplied by Whipple, I highly doubt this would cause a problem. I have read on the HPTuners board about some saying its in the tune related to airflow tables and others saying its just the standard bypass valve that is used. I dont know much at all about the tuning of these cars or HPTuners, but I dont see how you can tune much to affect the vaccum at a certain RPM.
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2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
02-19-2019, 06:58 AM | #2 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,786
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My Maggie does the EXACT same thing. I have never driven a lt4 equipped Camaro or vette. It would be interesting to know if they are completely seamless when transitioning from boost/no-boost conditions. I'm sure they perform better than my car or there would be complaints. I find this to be a fairly minor annoyance; I have learned to drive around it but it would really be nice to eliminate or significantly mitigate this issue.
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned |
02-19-2019, 07:50 AM | #3 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,789
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I would think it could be smoothed out in the driver demand table. I haven't noticed it yet with mine but I have not had a chance to drive it much.
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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 |
02-19-2019, 08:00 AM | #4 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,786
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I'll see what Ted comes up with when I get my motor back in and start tuning. We never really addressed the boost transition flat spot when I first installed the blower. Now that I've jerked everything apart to install the 2nd phase of my mods, we will obviously be starting over again anyway. I'm hoping if we cannot completely tune out this condition that we can at least make it a little less intrusive. I guess I will find out soon, the machine shop has finally started on my motor, I'm hoping to get it back by the weekend!
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned |
02-19-2019, 08:26 AM | #5 |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
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Yeah it would be good to know if you experience it as well. I have learned to drive around it, but it would be nice to smooth it out. It seems to be worse when it is cold, but it is always there. i would imagine if you have driven your car at least 50 miles with some stop and goes, you would experience it. It does it every time i am out in it.
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2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
02-19-2019, 08:29 AM | #6 | |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
|
Quote:
Good luck with your build, it is so painful waiting for stuff to get done. I am sure it will all be worth it, i am excited to see your results.
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2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
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02-19-2019, 10:53 AM | #7 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,786
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Thanks, man. I am champing at the bit to get the car back together!
It's interesting that the Maggie and Whipple behave so similarly. I wonder if lt4's use a vacuum actuated bypass valve? While I don't have a clue, I would not be surprised if they use an electric valve with a sophisticated feedback system that gets input from dozens of sensors. I hope King is correct that it can be tuned out.
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned |
02-19-2019, 12:14 PM | #8 |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
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So this is the response i got back from Whipple:
"You can move the vacuum line from boosted operation to vacuum actuation." "You can also put a .020” orifice inline to slow its response down." I am willing to try them both. Might be easier to move to vacuum actuation, just need to find a vacuum line to tap into.
__________________
2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
02-19-2019, 02:34 PM | #9 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,786
|
Very interesting! I am very interested to see whT effect this has on your car. I imagine you could do the same on a Maggie, the valves are probably very similar.
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned |
02-20-2019, 10:03 AM | #10 |
Drives: 2017 1SS 1LE Join Date: Aug 2017
Location: New Jersey
Posts: 391
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My car does the same (Whipple).
Matick Chevy did a bunch of blown Silverados and reconfigured the electronic bypass valve actuator from the LT4 to work on the Magnusson (if I'm recalling this correctly). I'd love a good electronic bypass valve on my car. Here's the LT4 part - https://www.gmpartsdirect.com/oem-pa...bC12OC1nYXM%3D Anyone want to sell me a kit?
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2017 1SS 1LE - 663 whp/623 wtq Rotofab/Whipple/Kooks 2"/LT5 TB/LT4 Fueling/E85/MCS Coilovers/Ground Control/GOODAero/Apex Wheels/Race Louvers |
02-20-2019, 10:32 AM | #11 |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
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I found an in-line .029 orifice fitting that I am going to try. Found it here:
http://www.42draftdesigns.com/inline-restrictor/ I will let you know how it goes. An electronic one would be so much better!
__________________
2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
02-28-2019, 08:50 AM | #12 |
Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016
Location: 19518
Posts: 402
|
Just and update, the .029 inline orfice for the bypass valve did not make any difference in smoothing out the rough spot between 2500-3000 under light acceleration.
__________________
2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11
Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92 |
03-01-2019, 07:55 PM | #13 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,789
|
We had decent weather today so I got my car out and cycled between 25-3000rpm several times and did not notice any rough spot. I'm wondering if it has to do with how my driver demand table is tuned or is it just a Manual trans issue?
__________________
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 |
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