08-17-2020, 07:56 PM | #57 | |
Drives: '17 ZL1 Join Date: Jul 2016
Location: Fairmont, WV
Posts: 1,558
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If your pressure is dropping that much, then you are right at the edge of losing all pressure. Pumps certainly flow better at lower pressures, but I don't know that commanding 275 kpa is a good idea. Commanding higher pressure won't help either. I've spent hours on the dyno tweaking fuel pump related settings and it basically was just a long exercise to learn the settings are optimal in stock form (at least for the stock pump). I assume you are using the Fuel System Voltage Min table. Are you sure that's doing what you think it's doing? I'm not sure it actually increases the voltage to the pump (maybe it does). What it might do though is work against you and cause the FPCM to command a lower duty cycle. If it thinks your pump is working at 15.9 and you still have Base duty cycle table and the VBAT Mult table configured for the stock pump, I bet it will reduce pump performance instead of increase it. I'd leave the voltages in the tune stock and work to get the calibration for the pump correct if you haven't already (Min DC, Base, VBAT Mult). In the end, you still may need a voltage booster, but at least the configuration will be correct which will allow the car to maintain steady pressure instead of bouncing high and low. (BTW. Take this for what it's worth. I'm not an expert and don't claim to be. I've just spent a lot of time experimenting with fuel pump settings.)
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08-17-2020, 08:55 PM | #58 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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Agreed, I’m not sure about the Fuel System Min Voltage table. I just took the stock ZL1 table and tweaked it up a tick to 15.9, but I’m not entirely sure if that helps either. But I feel like the pump is capable of more, but not sure where I’m going wrong. I guess another possibility is the factory fuel line might not be big enough? I’m running the LPE check and eliminated the tiny OEM one that was pinched into the original fuel hose, so hopefully that is one bottleneck gone. But I found it interesting that I was holding full 2900# rail pressure even though the low side was dropping pretty good, so I’m thinking maybe the check setup helped with that.
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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
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08-17-2020, 09:57 PM | #59 | |||
Drives: '17 ZL1 Join Date: Jul 2016
Location: Fairmont, WV
Posts: 1,558
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I've learned you have to try to keep it right in the sweet spot at WOT (~500 KPA). Not higher or lower. Of course, you'll get some minor correction during shifts, but with steady demand the pressure should be really steady. If not, something is not optimal. If I may offer more advice, I'd say do your best to configure the tables as close to the actual performance of the pump as possible. Find every spec sheet or test you can find to get actual numbers. When everything is in balance, I'm confident that's when the pump will provide the most fuel. Don't be tempted to bump up settings in an attempt to make the pump work harder. That's what I was doing, and I wasted days of my life tweaking settings only to find out that's not how it works best. It's like whac-a-mole. A tweak in one place may appear to make things better under a specific condition, but somewhere else a problem will crop up. After tweaking pretty much everything, I landed on a config with only the High Flow mode conditions slightly tweaked to be enabled at 3,200. Everything else is now back to stock with the fuel pump tune (just using the JMS booster now). (I know your pump is different than mine, but just sharing my experience.) Quote:
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08-19-2020, 06:28 PM | #60 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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I think @scantone was on to something. I just ordered up a JMS voltage booster and will give that a try with the DW400. Stay tuned...
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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
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09-05-2020, 12:34 PM | #61 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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JMS update
So, after adding the JMS voltage booster, I can confirm that it’s a must have, even with the bigger DW400 pump. With my build finally getting dialed in, I’m not spinning the blower very hard (only 11 psi), so HP Tuners shows ~90 lb/min of airflow (around 900 crank HP, maybe 760 at the wheels). Only on 93 octane now (E10 around here). *Without* the JMS, I would command 72 psi and it would start there, but by the end of two full gears of WOT, I would be down to 38 psi... not good! *With* the JMS, I’m still commanding 72 psi, and it’s holding it the full time, no problem.
I’m sure it’s capable of more, and of adding E of course, but unfortunately I’m still limited by my injectors currently (5.7ms). Once I get a chance to play with that a bit and get that down, I’ll pulley the Whipple down a bit and see where the next road block is... or, maybe try adding some E. TLDR: you need the JMS, no matter what in tank pump you’re running.
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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
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09-10-2020, 08:35 AM | #62 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,797
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5.7ms on the injectors is safe imo. 6.2-6.3 is about as high as I like to see them in short blips.
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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 |
02-23-2021, 03:04 PM | #63 |
Drives: 2011 SIM 2SS/RS 6M Join Date: Jul 2011
Location: LHC, AZ
Posts: 49
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I want one
Hi Dixie ZL1. I'd like to buy this setup. Please contact me asap
Last edited by xqwzit; 02-23-2021 at 03:15 PM. |
04-06-2021, 03:36 PM | #64 |
Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 341
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Bringing this thread back to life.
Deatschwerks has a new kit available for 2016+ Camaros. https://deatschwerks.com/products/9-442-c103-0902 Did anyone try this one yet?
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2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 |
04-06-2021, 06:18 PM | #65 | |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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Quote:
Although there is something to be said about the brushless pump making way less heat in the fuel.
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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
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04-07-2021, 12:01 PM | #66 | |
Former GM Technician
Drives: 2018 ZL1 A10, 06 Silverado Duramax Join Date: Sep 2009
Location: Switzerland
Posts: 341
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Quote:
Looks like the stock ZL1 pump with a Voltage booster is still the better option.
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2018 Camaro ZL1 A10
Rotofab Big Gulp, Nick Williams 103, Magnuson 2650, 9.17" (14%) lower, 90mm upper, Vengeance Racing Heads (LME) Cam Package (Cammotion Stage 1), Johnson Lifters, JMS Voltage Booster, Lingenfelter high flow check valve, BBK shorty headers, Custom 2.75" down pipes, Gesi Gen2 high flow cats, MM catch can 791whp, 772ft-lbs SAE Just added 30% XDI Injectors, LPE big bore hpfp, Flex fuel. Elite tuning, results coming soon. 2006 Silverado Duramax Diesel MPI Compound Turbo 40% over Injectors Efi Live DSP5 Tuning Follow me on Instagram: Swisstyphoon1980 |
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04-07-2021, 12:15 PM | #67 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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Might be worth reaching out to DW to inquire about the voltage booster question.
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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
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01-27-2022, 11:03 AM | #68 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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I am putting an lt4 sc on my ss, pulley to bring boost to around 7psi. I am eventually planing on runnin e85. I am putting in lt4 injectors and hpfp, you think the dw400 would be good for me? Not looking to make too much hp, maybe 600-650
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01-27-2022, 11:47 AM | #69 |
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: Petersham MA
Posts: 4,749
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Regular ZL1 in tank with JMS voltage booster is perfect for your setup.
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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
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01-27-2022, 05:40 PM | #70 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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Does the powermax put out variable voltage or is it a constant feed? Does the stock pump use variable voltage?
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