Desperate for some Help With Microsquirt, Beyond Frustrated Options

[Mblizzard]

I have been trying to get my conversion done in time for Okteenerfest. I have run up against a brick wall and just cant seem to figure out what i am doing wrong.

If anyone can help me by looking at my tune files or providing insight it will be very much appreciated.

I can get th car to idle but nothing beyond that. Any use of the throttle is less than impressive and almost useless. Meaning it bogs down and does not accelerate at all.

I have no clue what i am missing.

2056 with new low impeadance injectors. Bosch Wideband O2 sensor.

Really need some suggestions. Not sure if i can post the tune files here. But will try.

[JeffBowlsby]

Please do not misunderstand my question, I am an inquisitive person and only seek accurate information, not to start a heated debate. The question is purely rational and not subjective. When a bold claim like that is made it requires justification otherwise the myth that D-Jet is somehow problematic/flawed/inefficient/etc. continues without justification. I have always run D-Jet cars and find them to have no issues and terrific. No doubt other FI systems have their benefits. We have street cars here, not high performance, highly sensitive machines requiring the minutia to be exactly perfect.

From my perspective, any quality made, appropriate to the engine, properly adjusted FI system is as good as another in terms of how the engine performs and functions. With that understanding no FI system will perform significantly better/worse/differently than another, will not be more responsive/give more power/better mileage etc. The best FI system just feeds the engine what it needs and as long as it does that well, whats the difference?

Show us the justification of the above claim or qualify/recant the broad generalization. Its a fair question.

[Mblizzard]

Please do not misunderstand my question, I am an inquisitive person and only seek accurate information, not to start a heated debate. The question is purely rational and not subjective. When a bold claim like that is made it requires justification otherwise the myth that D-Jet is somehow problematic/flawed/inefficient/etc. continues without justification. I have always run D-Jet cars and find them to have no issues and terrific. No doubt other FI systems have their benefits. We have street cars here, not high performance, highly sensitive machines requiring the minutia to be exactly perfect.

From my perspective, any quality made, appropriate to the engine, properly adjusted FI system is as good as another in terms of how the engine performs and functions. With that understanding no FI system will perform significantly better/worse/differently than another, will not be more responsive/give more power/better mileage etc. The best FI system just feeds the engine what it needs and as long as it does that well, whats the difference?

Show us the justification of the above claim or qualify/recant the broad generalization. Its a fair question.

Very valid.

First, I think you read too much into my statement. I never claimed better 0 to 60 times, more power, or a higher top speed. My performance reference is to the fuel system not the car.

The D-Jet is neither perfect or seriously flawed. But it is limited in what it can control and the changes it can make. When it comes to keeping an engine within the most desirable operational parameters, modern systems are more flexible, capable of monitoring and controlling more parameters, and have a more realistic capacity to perform better at operating the fuel system over all conditions than the D-Jet even on a stock engine. Additionally, the improvements in modern sensors, the accuracy of the sensors, their durability, and the ability of the ECU to make decisions based on more data results in a very real step up in the performance level of the modern fuel system over the D-Jet.

First as we all know, the stock system lacks sufficient feedback to accurately determine the impact of changes the ECU made had on the engine. If the parameters called for a specific condition the D-Jet blindly supplies fuel for that condition regardless of how it impacts the engine. Regardless of loving or hating the stock system adding an O2 sensor that provides actual feedback to the ECU allowing it to determine the impacts of changes made is a step up in performance of the fuel system.

Next, being able to accurately adjust the various ECU parameters to meet your specific engine requirements directly results in better performance. You very accurately acknowledged it is essential for any fuel control system to be properly adjusted to the engine. I have 96mm pistons, big valve heads, performance exhaust, matched injectors, and electronic ignition. Each of these required adjustment to the D-jet system to account for the change. My ability to adjust the old system to account for these changes was limited and very difficult to accomplish. Adjusting a MPS to account for a engine modification requires a Zen like level of commitment.

I removed a functioning D-Jet system from this car. It is in a box and I will keep it. It worked and performed well. But it was clear based on AFR readings, that there were times and conditions because of my settings and my engine modifications, where it was documented that the fuel system was not performing well. Under certain conditions it was extremely rich (in the 10's) and other times it would be way too lean. Regardless of adjustments made to the stock system it was very difficult for me to reach a state where I had reasonably consistency across the range of engine conditions. I simply had to settle for a level of adjustment that worked reasonably well. It is my opinion that settling did not allow me to take full advantage of my modifications.

With the stock system I struggled to control AFR, cylinder head temperatures, timing, start-up, and other issues. While it has been a bit of a pain, with the new system I can adjust it so well that I can have all of my parameters in the ranges I want under the conditions that I want to specify.

For those few reasons above I think my bold statement about the performance of the fuel system is supportable. I am sure there are some numbers out there from Dyno testing and such that may be able to support higher HP or faster 0 to 60 times but that was never part of my statement.

[poorsche914]

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Will be looking at your system closely. Would like to put something similar on my Raby 2056 in place of the carbs.

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