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01-07-2013, 10:15 PM | #2526 |
Scooby Guru
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Speaking of the Hydra, check out these screen shots! Look how easy it is to program the outputs. There's so many options its crazy!
Using this setting, I have my Eboost2 automatically switch boost maps when the car is filled with E85: Instead of three relays, a timing circuit, sensors and countless wires, this output runs the fuel pump duty on an as needed basis with only a single wire:
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01-07-2013, 10:20 PM | #2527 |
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Here's a totally crazy example of the logic you can create. Thus far, I haven't found a value that the Hydra reads from sensor input or calculates after the fact that isn't available:
Check out the number of variables listed in relation to port air temp: |
01-07-2013, 10:24 PM | #2528 |
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I have thought about this too. I am actually going to see Phil in person tomorrow so I will ask him about it.
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01-07-2013, 10:27 PM | #2529 |
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Right the turbo increases the temp at higher loads and rpms ALL the time. So when you tune the timing and fuel tables you already take that into account. If the turbo increases temp more from say 22-28 psi then your fueling and or timing tables that are based on load and rpm, already reflect this heat and pressure change during tuning.
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01-07-2013, 10:45 PM | #2530 | |
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Quote:
At least in my mind, I can easily see this being true. If you think about it, the stock ECU pulls the air temp from the filter pre-turbo and takes the same info into account. There's no way that the stock ECU would know if you just did a hard pull and the IC is heat soaked or not. |
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01-07-2013, 11:34 PM | #2531 | |
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Quote:
Does the Hydra have logic that limits your use? The chip(s?) can only perform so many tasks before you start to loose the resolution necessary to keep up with the changing environment of the system. I would think that, without some expensive processors, even the OEM sensor list is nearing the edge of capability. Throw your hydramist and fuel sensors in the on top of a bunch of additional logic; that is a heavy load- right? |
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01-08-2013, 03:56 AM | #2532 | |
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Quote:
Phil has the data to back up what he does but it doesn't seem possible to me that an ambient temp of 75 degrees will always equal an 89 degree port temp under all conditions with all the other variables involved. If you are worried about the IAT fuel corrections putting you closer to your knock threshold you can tweak you IAT ignition comps to counteract that effect. |
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01-08-2013, 04:05 AM | #2533 |
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Standalones rock don't they
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01-08-2013, 06:56 AM | #2534 | |
NASIOC Vendor
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Quote:
The factory MAF setup isn't perfect, but the factory does know what intercooler and turbo (and accompnaying efficiencies) come on the car and there is learning based on beedback to tweak fueling. One of the reasons (although a small reason) I switched from 'big' blow-thru to Cobb SD is it removed the IAT variable from an assumed value to a known value. On another note, the Hydra gui looks much better than years past, and fairly simple to program I/O. |
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01-08-2013, 10:47 AM | #2535 | |||
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Quote:
Quote:
One of the biggest points of SD is to not have to estimate conditions in the manifold like with the stock MAF system. You can just measure it exactly. There's a reason Bosch decided to spend time coming up with a sensor that can measure both temp and pressure in one package: http://www.bmotorsports.com/shop/pro...oducts_id/1721 Putting the temp sensor in/near the manifold also makes it so you don't have to tune the IMAT compensation! The IMAT compensation that Subaru uses in their Group N SD ROM, is exactly what physics says it should be! Look at this spreadsheet where we first calculated Air Density as a function of temperature then made the pivot temperature point the same as stock (104F) then calculated the IMAT compensation with reference to temperature. The math worked out exactly to what Subaru is already using. And this was one less thing I had to tune on my SD setup. The damn thing just works at all temperatures! Quote:
But, I understand what Phil is saying about the tune automatically running richer when the difference between ambient and manifold temp gets further from what is tuned. That when the manifold air temp is higher than expected, the tune will run richer. And I guess that's okay for a car that's always on the move. But this would absolutely suck for a car sitting at the start of a drag strip waiting for the lights to drop in the middle of summer. Or a traffic light. It would run unnecessarily rich. But, there is no need to over-enrich the mixture when the intercooler starts becoming inefficient. It doesn't matter why the air temp in the manifold goes up; whether it's due to it being hotter outside or because the intercooler is not cooling enough. All that matters is the Volumetric Flow Rate and Density of the air in the manifold. Last edited by MRF582; 01-08-2013 at 11:18 AM. |
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01-08-2013, 11:26 AM | #2536 | |
Former Vendor
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Wow, there's just too much here for me to address each post but keep in mind I don't disagree with much of the theory but I do disagree on many fronts when is comes to practical application. It's what really a happens in the real world under real conditions and components.
Quote:
Now as ambient temps decrease, there's more oxygen, and your intercooler efficiency increases. As a result if you don't do anything about your boost level it will increase but with that you move into a new load cell which has more fuel and your IAT is taking care of the newly increased oxygen. But you're running a closed loop boost control system so that natural increase in boost is counteracted and boost is lowered back to where it should be negating so of that huge power increase you see from higher boost levels. But you say, Phil it's more cooler post IC and you would be right. This is why the IAT correction curve is not linear! Intercooler efficiency at colder ambient temps is dealt with. We just all need to agree there is no perfect solution which is why closed loop fueling, boost control, etc. is in play for any sophisticated EMS. Tom will be the first person to tell you his Hydra has been seasonally consistent and his OEM speed density solution was not. It's because of all the hard work I put into developing a set of correction tables specifically for the Hydra and tuned them seasonally to ensure we ended up with the consistency or safety nets I wanted in place. I suggest that Hydra customers follow my lead but if they choose a different path just be prepared to have to go a full year reinventing compensations that will deliver the consistency and safety you need. |
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01-08-2013, 11:42 AM | #2537 | |
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I, on the other hand, have almost zero seasonal variations (less than 3%) with my OEM SD setup. And the temperature here swings from 2F to almost 100F throughout the year... But it did take me hundreds of hours of tweaking and doing lots of math to learn the nuances. Maybe I am just not a fast learner, |
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01-08-2013, 12:00 PM | #2538 | |
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Quote:
Like the post above says and phil says not all is perfect but its all on the time u put u into ur system or tune. If u half ass it.well u get what u pay for. U take ur time and get someone or urself put the hrs and days into testing and it will not be perfect but pretty darn close. |
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01-08-2013, 01:11 PM | #2539 | |
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Quote:
This is why it's not linear. Air density isn't linear with temperature. |
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01-08-2013, 02:46 PM | #2540 |
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^Ding. Convection heat transfer is linear, for most simple calcs:
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01-08-2013, 04:28 PM | #2541 |
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[quote=Maxwell Power;38862549]actually no.
This is why it's not linear. Air density isn't linear with temperature. Please don't bother trying to educate me on tuning. My point was that intercooler efficiency based on ambient temp isn't linear either and therefore it's dealt with in the Hydra correction tables. Anyways Tom is super happy. He was down right giddy at how awesome it runs now! Like I said do whatever you guys feel is best, I know what works for me and I've tried it all . I've been developing engine management systems for 10 over years. |
01-08-2013, 04:38 PM | #2542 | |
Former Vendor
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Quote:
If there is one thing I've learned over the years tuning, it's that sometimes you need to toss conventional wisdom out the window. Last edited by Element Tuning; 01-08-2013 at 04:45 PM. |
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01-08-2013, 04:45 PM | #2543 |
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And that is really the bottom line isn't it? A fully tuned and developed strategy will always be best. In this world if you are not 100% capable yourself, all you can do is pick the most capable person to get you where you want to go.
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01-08-2013, 05:02 PM | #2544 | |
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[quote=Element Tuning;38864295]
Quote:
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01-10-2013, 11:06 AM | #2545 |
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As a few of you may have caught, I did in fact take the car to Phil on Tuesday to get the Hydra 2.7 "pre-tuned". It was somewhat of a nightmare experience because the daily low has been around 16F and there's around 2ft of snow at my house. Since I am running max dry tires and have race coolant (not anti-freeze) in the engine, things were a little crazy.
We were able to get the car down my somewhat steep driveway and onto the trailer the night before without an issue. I left the car outside overnight with a block heater going with the hope that it would significantly warm up the next day like the weather man said it would. Unfortunately, it was 19F at 6AM and there was no way that i was going to chance hauling a car with race coolant in 19F weather. I drained about a gallon of coolant form the system and drove to get some anti-freeze. We arrived at Element a few hours later and Phil had the car running nearly instantly. We drove around for about two hours dealing with any driveability issues and getting all the basics setup. The car runs very well and its AMAZINGLY RESPONSIVE!!! There's zero comparison to how it ran this past summer which if you recall was VERY laggy. I couldn't be happier! The trip back was uneventful but when we got to my house we ran into a lot of trouble. It took 30 minutes to get the car up my 25ft driveway due to ice. It also took us over an hour to park the trailer because the truck just kept slipping sideways every time we tried to back up. We ended up using chains and a small come along to drag the trailer back into its spot. In the end I was frozen and tired but at least the car worked! Here's my car on my trailer sitting a bit down the street from my house. My road isn't flat so we always have an interesting time loading. Last edited by dexterous; 01-10-2013 at 10:42 PM. |
01-10-2013, 11:33 AM | #2546 | |
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Quote:
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01-11-2013, 02:44 AM | #2547 |
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Please let this be the time your car runs sustainably for at least a year or two without any problems!!!
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01-11-2013, 09:01 AM | #2548 |
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01-11-2013, 10:39 AM | #2549 |
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What was the outcome with the motor, was the block gaurd installed, or is it as-is? I don't recall what the final outcome was on that.
Glad you hear she's running and ready to be enjoyed! |
01-11-2013, 11:34 AM | #2550 |
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I believe he is pulling the block out and having that done now. He wanted to get the hydra in there first then pull the block have that done and be ready for this coming spring summer.
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