b.r.i.a.n.

This afternoon, I retuned my AP1 once again. Since the last time, a few things have changed. I swapped the Haltech Sport 1000 ecu in favor of the Pro Plug In. I swapped over the 70mm throttle body in favor of a 74mm throttle body. I got rid of the velocity stack and just went with a 3.5 inch filter. I changed the 2.5 inch test pipe to 3 inch and I also added a fuel composition sensor. For those of you who did not see my previous thread, here's the link:

https://www.s2ki.com/s2000/topic/909...tepped-intake/

At the moment the car has the following modifications:

diy stepped 3.5 inch to 3 inch intake with injen filter
- skunk2 74mm throttle body
- hondata intake manifold gasket
- plm header and 3 inch test pipe
- hks 3 inch single exhaust
- injector dynamic 1000cc injectors
- E85 fuel
- Haltech Pro Plug In ecu
- fuel composition sensor

The main reason for retuning apart from the minor bolt on changes is to do a comparison between pump gasoline and E85 fuel. There was still some ethanol in the tank when I poured some gasoline. I was able to get the ethanol blend down to 18%. I've seen the local gas stations averaging 9-10% ethanol in their gasoline. I tuned the car on E18 and the engine yielded 220-221 whp.

I then poured in 10 gallons of pump E85 from the local U-Gas. There was still some gasoline in the gas tank and after 10 gallons of E85 the mixture came out to E63. I have seen an average of 77-80% ethanol in the E85 sold at the local U-Gas. Had I drained the tank I may have seen that amount. The engine was retuned on the spot with the E63 blend.

The red and green line were the last two passes made on the E18 blend. The blue and black lines are the last two passes made on the E63 blend. As you can see, a 45% increases in ethanol yielded a gain of approximately 5-6 whp. I'm sure another 2 whp could have been squeezed out with the ethanol content closer to 80%.

So in conclusion, yes, even with a naturally aspirated engine the hype is real.

Gernby

Nice!

ConeKiller2

Great results. Fyi. I just did the similar with adding e85 from Sunoco in ft Lauderdale and ended up with 66%. Made 235/169 on my ap2 with haltech sport and fuel sensor. Toda header, berk header back and custom intake manifold. The car did not like the long intake setup. We switched it to a short intake and gained 5-7 hp and torque across the range. The only place the long intake made a difference was just below vtec. I will be designing a new intake and going back in addition I want to try a gernpipe. I think with some better fuel and a few changes we can get to 240/175

b.r.i.a.n.

What what the diameter of the intake pipe? If you're going with a short ram design I would try 4 inch since there's room in the bay.

ConeKiller2

3.5"

slowd16

You should be better than that Sacha. I have a long 3.5 intake,70mm TB, IM matched to TB, Berk header, 70mm test pipe, and hks 3" on haltech. Made 238/169 STD on 93.

Brain: you port out the intake manifold any extra for the 74mm throttle body?

b.r.i.a.n.

I don't think it's fair to compare dyno numbers. My car made 234 whp on this very dyno back in 2011 at twilight performance. This very same dyno was moved over to MIA performance where my car was retuned yesterday. It made less power according to the dyno.

I personally prefer to go by trap speed at the 1/4 mile. Just to give you an example, my cousins k24a2 swapped rsx on this dyno at mia motorsports made 229 whp last year and trapped 105.8 mph. The mph seems a tad high compared to the dyno number. I would expect somewhere around 102-103 mph trap speed from ~229 whp and ~2700-2800 lbs.

As far as the manifold goes, yes I ported the opening to the manifold.

ConeKiller2

First run was 228/163 and was lean everywhere using old tune with new setup. Tuned it and kept adding fuel but couldn't get much better than first run. Then yanked the long intake and tried a few different setups using the piping I had and gained 5-7 hp throughout. You could tell the car has opened up a lot. This was with a basic large radius 3.5 90 bend and a small cone filter. I will be making some additional changes and going back

flanders

Thanks for the nice comparison Brian, I want to see some ITB's on that engine now

thomsbrain

Dumb question: Can you easily switch from E85 to gas and back? With tunes for gas and E85, does the fuel sensor allow you to put whatever into the tank and the car can sort it out and make use of it? Or do you need to commit to one type of fuel?