Honda Insight w/Acura TSX engine - Ecomodding

[mpg_numbers_guy]

Originally Posted by Ecky

The engine revs like a sport bike engine and in lower gears the digital speedometer doesn't update quickly enough - I'll see things like "2, 5, 18, 35, 65" - it's very easy to overshoot my target speed.

Problems Honda never thought of when they designed the Insight.

Will you still be running the Bridgestones, or will you be getting beefier tires to handle all that new power?

[hispanicpanic]

Originally Posted by Ecky

The mounts are *very* custom, it was one of the biggest hold-ups.

I suggest a 50 durometer rubber, it it's possible. 60 tops

[MetroMPG]

Yay, shakedown drive! Pun intended!

Stock MPG gauge work?

[Ecky]

Originally Posted by MetroMPG

Yay, shakedown drive! Pun intended!

Stock MPG gauge work?

Sadly, no. I'm currently taking the car on a 2000 mile road trip and don't have time to look at the wiring for that for a few weeks minimum. I may be able to program a microcontroller to output to the cluster if it uses a simple analog signal (I'm thinking it's just a fuel count from the ECU).

But really, I'm just at the point where I'm very proud of having adjusted the engine maps so that it doesn't die every time I shift to neutral and take my foot off the gas. Boy that was tough to drive in town, given that the brakes go rock hard when the engine dies.

In other news: first two tanks are in the fuel log, and I have a *lot* of room for improvement. Driving at ~65-70mph to Michigan in 5th gear (~2800-3000rpm) because it won't hold 6th right now, I averaged a hair over 43mpg. That, plus roasting the tires a few times and embarrassing a few Mustangs and a Corvette. Lower than I had hoped, but not too bad all things considered.

[19bonestock88]

For how quick the car is, 43mpg is damn good... you’ll easily knock down 50mpg tanks once the tune is dialed in better and you have 6th gear...

[Ecky]

Originally Posted by 19bonestock88

For how quick the car is, 43mpg is damn good... you’ll easily knock down 50mpg tanks once the tune is dialed in better and you have 6th gear...

Underbody panels are all off right now, and I found (and corrected) that the radiator fan was running full blast the entire way.

Changes to tuning I've made so far this morning:

-Adjusted idle valve duty cycle down a bit, I overshot with my changes. Engine stays running.

-Set idle down to 700rpm from 900rpm. Might go lower.

-Moved idle lambda from 14.6:1 to 14.7:1.

-Changed radiator fan setpoint from 180F (point where the thermostat just starts to open) to 200F (5 degrees after thermostat is fully open).

-Disabled knock sensor temporarily. Ordered new knock sensor (K-Tuned). I believe it's damaged, but this tune uses very conservative ignition timing so should be safe to drive.

-Dialed max cam advance back in software from 50 degrees to 40 degrees, to represent the mechanical stop I put in.

-Lowered rev limiter from 7600 to 7100rpm, since I can't see those on my tach right now.

-Changed system from "WOT compensation at fixed lambda (12.5:1)" to "Fuel compensation from target lambda tables" and made a gradient that does not let it get richer than 13.5:1.

-Added a lot of cam advance in low throttle and typical cruising load operating range to get some EGR and reduce vacuum losses.


I also plan to do some o what's called "auto-tuning" where the ECU will record the variation/compensation it needs to make during actual operation from the fuel maps, and then saves those compensations and makes changes to the actual maps.

[Ecky]

I'm thinking this thread may have grown too large, and it might be time to start an "Ecomod K24 Insight" thread. I kinda started one with the lean burn tuning thread, but that doesn't encompass everything I want to do with the car.

In other news: best tank yet, 48mpg after tuning, typical driving speed ~62mph, clear and dry, unable to use 6th gear.

[hayden55]

Originally Posted by Ecky

I'm thinking this thread may have grown too large, and it might be time to start an "Ecomod K24 Insight" thread. I kinda started one with the lean burn tuning thread, but that doesn't encompass everything I want to do with the car.

In other news: best tank yet, 48mpg after tuning, typical driving speed ~62mph, clear and dry, unable to use 6th gear.

What is your final drive ratio and 6th ratio?

[MetroMPG]

I think we definitely need to re-name THIS thread. It's progressed far past "thoughts". Give me something more descriptive, and I'll change it. What's your MPG expectation once the bugs are worked out? That'd be a good tidbit to include in the title.

[MetroMPG]

Also: should include some description for non-Honda-heads. IE: most people have no idea what "K24" means.