K20A3 - Tuning for Economy - Page 2 - Fuel Economy, Hypermiling, EcoModding News and Forum

EP3 · 06-29-2008, 02:18 PM

Yeah I miss my 01 GSR

rsx2002 · 06-29-2008, 03:19 PM

Well bro I have one sitting under the hood of my car. It says right on top of the engine i-VTEC 2.0 DOHC. Your telling me my engine is lying to me?

rsx2002 · 06-29-2008, 03:46 PM

and if your saying that VTEC doesnt give you an extra boost then I must disagree with you there too. there are plenty of videos on youtube where you can clearly hear and see the results of vtec kicking in

Vince-HX · 06-29-2008, 09:13 PM

Quote:

Originally Posted by rsx2002

Well bro I have one sitting under the hood of my car. It says right on top of the engine i-VTEC 2.0 DOHC. Your telling me my engine is lying to me?

If your block says k20a3 it uses vtec-e and VTC. True v-tec has high and low cam profiles for the intake and exhaust. If you dont believe me take your valve cover off and see for yourself. Also notice the difference in HP and TQ from lets say a k20a2 and your engine.

From a tuner standpoint people hate the k20a3, it seen as the worst K series mainly because it doesn't uses true vtec. But, for economy I think this engine has great potential.

You do get a "boost" @ about 2300 when the engine goes from 12 valve mode to 16 valve mode.

Great job on your FE by the way

EP3 · 06-30-2008, 03:07 PM

I know what you are saying. The engine does say I Vtec. EP3 and Rsx are basiclly the the same.. same engine as rsx but not the rsx s. Yeah unfornatly the K20A3 in my mind has made a shame out of the civic si breed. I would have rather had the coupe si of older years. I remeber my Integra GSR with a B18, the B-series were my favorite. When the Vtech cams switched, you would have to hold on to the wheel. That was my favorite car. I am intreasted to test the new Si though. But I will not take myself to the dealer to test it out, in fear that I am not ready to buy. I will love it to much. But that being said the ep3 is a good midrange car faster than some but not fast. Handles good and You can get a Xmas tree in the back with the hatch shut, if you fold down the seats. Ok mpg and looks are ok. I bought the car used b/c of the price and wanting a slighty sporty car.... And no matter what it is a HONDA, the best company. For the price/quality you can not beat a Honda.

c0da · 06-30-2008, 04:02 PM

Let me know when you start working on an R18.

Vince-HX · 07-02-2008, 01:21 AM

Quote:

Originally Posted by c0da

Let me know when you start working on an R18.

That is one cool engine, the way it works to eliminate most pumping losses is very interesting. A turbo manifold would be insanely easy but the drive by wire system is kinda sketchy for tuning I would think.

For anyone that cares here is a great writeup on that engine.

Technical Overview of Honda's new R18 i-VTEC Implementation

Vince-HX · 07-02-2008, 01:33 AM

Oh, i know you guys love hardcore numbers and A-B-A testing but the guys driving didn't really come through, sorry

The engine was leaned out to 17-18:1 without any noticeable changes in how it ran, misfiring, ect. The speeds were very ecomodder unfriendly @ 80-90 mph but the newly tuned engine burped out 41 mpg

The total trip mileage was approx 850 miles.

They had made this same trip before and stated that approximately half the gas was used for this trip compared to any previous ones. I believe the driver does not have any hypermiling knowledge either so i dont think DWL or anything like that was used. I do want to say that the previous tune was pretty bad and his car didnt run very well, worse then a bone stock car. So the better tune probably accounted for some of the 50% fuel reduction.

Hopefully I can get the local tuner, Locash, to do a real economy tune on his dynapacks for a small fee. I'm really interested in how far this engine can be pushed

I wanna see 25:1

Ep3's and Rsx's getting 50mpg may be in the future

Before any of you guys ask the tuning software is $1000 for a K series so unless your car already has it installed this may not be a $$$ friendly mod.