03-29-2019, 01:33 AM | #3011 |
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I have an AT with the Edelbrock kit and v25 tune for flex fuel and am having a rough idle. Sometimes sitting at a light, ignition advance timing is -2.5 deg. STFT is high, like +25%. Load is a little higher than normal. Vacuum sometimes is only -7psi vs the normal -10psi, so I imagine the bypass valve actuator is partially open, flooding the cylinders with compressed air and the ECU is pulling timing. If that sounds plausible, where could I be having vacuum issues?
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03-29-2019, 02:47 AM | #3012 | |
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Beyond that my car has been absolutely reliable with the delicious tune including excellent driveability, no regrets. If you're looking for more power I highly recommend. |
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03-29-2019, 02:35 PM | #3013 |
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I have to pull the motor to do the valve recall. I'm thinking of mounting the supercharger while its out of the car. Hopefully easier to avoid the vacuum leak issues as well.
Can you guys foresee any issues putting the motor back with the blower attached? Besides the obvious routing of hoses ect. Seriously thanks for all the replies. Its nice to see an active forum like the preFacebook days.
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03-29-2019, 02:37 PM | #3014 | |
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I'm about 2000 posts into reading this entire thread so It might of been answered already but CSG are you still offering this deal for the Dbox?
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03-30-2019, 06:15 PM | #3015 |
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Just ordered my 2nd replacement bypass valve after a year and a half on the first replacement .
Fortunately Jegs carries it (Edelbrock 51-7081) . Unfortunately it's $96 |
03-30-2019, 07:04 PM | #3016 |
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03-30-2019, 07:18 PM | #3017 |
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Depends on how big the hole is in the diaphragm. This one just started so it's basically a small vacuum leak, the valve still operates but is leaking vacuum so the car stalls occasionally but I haven't logged anything yet. The original one developed a couple holes, one fairly large so I was seeing high fuel trims in the logs and smelling fuel due to it running super rich.
It's easy enough to test, just pinch off the vacuum supply hose going down to the bypass valve and if nothing changes, i.e. idle stays the same, no sound difference, the valve stays opened...then it's good, no leaks. |
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03-31-2019, 09:44 AM | #3018 |
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03-31-2019, 07:11 PM | #3019 | |
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Their tune is much better than the Edelbrock one, but it is far from perfect. Performance when cold is pretty awful on my car and I sometimes get small stumbles under normal driving under light to moderate throttle. Zach's response was that 'there is a lot going on in that area' and couldn't clean it up. We only ever did a handful of revisions so maybe I just gave up on it too easily. Version 26 of the Edelbrock tune comes out next week, I'll be grabbing that and getting refinement with Bill now that he is back to doing the tuning. If you drive it like your stole it the tune is fantastic. |
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03-31-2019, 09:42 PM | #3020 | |
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I have the DT tune with a Cosworth kit and have no complaints. All revisions were done. |
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03-31-2019, 10:04 PM | #3021 |
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How is the bypass actuation done with the Cosworth kit?
I think 98% of the driving issues for the Edelbrock kit are based on the vacuum actuator. Even when it is healthy, it think it is poorly calibrated. When vacuum goes below 12 in it starts to open, meaning it is almost impossible to drive smoothly away from a stop without having it open. If it does open, even at 1500 rpm there is a large increase in air and the tune tries to adapt. If anything goes wrong you either get a stumble, in which case you compensate with the throttle or it you get a surge you do the same and it is very easy to set up a negative feedback loop. They need to have one with an adjustable spring. I'm building an electronic one based on a fast linear actuator and arduino unit in the passenger compartment with a cable that actuates the valve. Below 2k rpm it stays closed regardless of the vacuum and then it will ramp up based on a secondary air pressure sensor and the setting of a switch. One of the settings will be a valet mode where the actuator never opens, another an economy mode where you have to lean into the throttle more to get boost and then a sport mode which acts like the current vacuum actuator. This will also get rid of the constantly failing vacuum actuator. |
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04-01-2019, 02:58 AM | #3022 | |
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04-01-2019, 09:06 PM | #3023 | |
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Someone posted a pinch test on the vacuum line but I can’t find the post for the life of me |
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04-01-2019, 09:19 PM | #3024 |
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Vacuum actuator, but comparing the Cosworth instructions to the Edelbrock instructions it "appears" the part may be different. I also wonder if the larger blower size (TVS1320 on the Edelbrock compared to TVS900 on Cosworth) has any impact.
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