10-13-2022, 01:38 PM | #1 |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
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Dyno Shocker - Lost Power!!
So, it made 965 at 7000 a month ago with a 103 and 3" upper. We put a 112 and 2.75 on it this week and are shocked that it now gets to 850 at 5800 and rolls over badly.
99% of the HPT data looks good (except for KPa 11 is not right). Gained 3 lbs. boost, MAT is fine, spark and advance look good, etc., etc. Our first course of action is to replace the crimped exhaust pipe section today and redyno. Has anyone here had this happen to them? I'd bet shops such as KaTech have.
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
10-13-2022, 01:41 PM | #2 | |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
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Quote:
Post the dyno log.
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928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE
LME 377 LT4 Short Block | Magnuson 2650 80mm upper w/13% lower (9.06) | DSX Lid & Valve Covers | CSP Custom Cam w/32% fuel lobe | CID Heads | NW 103mm TB | Roto Fab Big Gulp | CSP 2" Headers w/Green GESI Gen 2 Cats | Borla 3" Full Cat Back w/ S-Type| Mighty Mouse Wild Catch Can| Custom Holley Low side Fuel system| TooHigh PSI Port Injection w/Holley Controller | Forced Inductions Interchiller w/2 gallon fender tank | TK Performance built 10L90 |
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10-13-2022, 02:07 PM | #3 |
Drives: 2019 Chevy Camaro ZL1 M6 Join Date: Jul 2019
Location: Sea level
Posts: 1,252
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What does your fuel pressure and inj pw look like? Didn’t you do the LPE HPFP?
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Kong Stage X Port, NW103, LPE HPFP, XDI +30 Injectors, ARH Headers, Flex Fuel, JMS Booster, AWE Touring, Elite E2-X CC. Stock heads, stock cam, stock pulleys: Tuned by KingLT1. 740whp Uncorrected on e50
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10-13-2022, 02:53 PM | #4 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,605
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965 at 7k rpm isn't necessarily better than 850 at 5.8k rpm, was it much stronger at 5.8k rpm as well a month ago? The log or at least the entire dyno graph from both tests would be helpful. And yes, that wild correction was already discussed in another thread with you IIRC.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
10-13-2022, 03:48 PM | #5 |
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Drives: 21 ZL1 Join Date: Feb 2022
Location: South East
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Lets see the log. Probably fuel pressure droping.
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10-13-2022, 03:55 PM | #6 | |
Drives: 2019 Camaro Z-28 Join Date: Jul 2010
Location: Dallas
Posts: 1,484
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Quote:
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2019 SS 1LE BIG NA A10 Eagles Canyon Raceway 2.7 CCW Below https://youtu.be/c9M5UHDftcA 4-15-23 at SCCA TT U1 Class MEGA Thread on THIS car: https://www.camaro6.com/forums/showthread.php?t=602092 Retired Cars BELOW: 1973 Camaro, 1969 Camaro, 1969 Camaro SS RS 2010 Camaro SS with 1000HP F1R, 2019 ZL1 1LE A10 |
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10-13-2022, 04:01 PM | #7 |
Drives: 2015 Camaro ZL1 Join Date: Oct 2020
Location: Clinton Twp, Michigan
Posts: 247
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The flat portion of the exhaust isn't your problem.
Could be a number of things. I would guess it's fuel delivery related without seeing a log or even dyno graph. Shot in the dark guess is if you log the pid for high pressure fuel pump delivery angle you'll see its maxed at 130 degrees. |
10-13-2022, 04:05 PM | #8 | |
Drives: 2019 Chevy Camaro ZL1 M6 Join Date: Jul 2019
Location: Sea level
Posts: 1,252
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Quote:
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Kong Stage X Port, NW103, LPE HPFP, XDI +30 Injectors, ARH Headers, Flex Fuel, JMS Booster, AWE Touring, Elite E2-X CC. Stock heads, stock cam, stock pulleys: Tuned by KingLT1. 740whp Uncorrected on e50
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10-13-2022, 04:44 PM | #9 | |
Drives: 2017 Camaro 2SS A8 Join Date: May 2019
Location: USA
Posts: 1,656
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Quote:
https://www.camaro6.com/forums/showp...0&postcount=82
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Roto-Fab w/sound tube delete, Katech ported TB, Pray IM, Velossa, DD side markers, DSX FF, UPR Catch can, Halo brace, My custom vent gauge pod
Originally Posted by arpad_m - “Aww, yet another oil thread with almost the same question in the OP“ |
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10-13-2022, 05:17 PM | #10 |
Drives: 2017 Chevrolet Camaro ZL1 Join Date: Jul 2018
Location: Canton, GA
Posts: 405
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I promise you it isn’t the crimp. I ran 8.40’s at over 162 MPH with it still there. We got rid of it and didn’t see any measurable change. It was just annoying me. Is the power higher at any point of the pull up to where it falls off?
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2017 ZL1 - PB 8.05 @ 172 MPH @ 3730 lbs @ 70 DA (work in progress)
Built by Vengeance Racing, tuned by Elite Tuned |
10-13-2022, 05:24 PM | #11 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
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Quote:
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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10-13-2022, 05:56 PM | #12 |
Drives: 2021 Red Hot ZL1 Join Date: Sep 2020
Location: Gapplebees
Posts: 3,084
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I think its fuel related too. The extra 3psi of boost is demanding more fuel.
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10-13-2022, 06:35 PM | #13 | |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
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Quote:
Here's the log: Fuel rail press 2812 psi Low side 80 psi Inj pulse width 4.8 ms
__________________
'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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10-13-2022, 06:43 PM | #14 |
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,559
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More data
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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