Accord_V6_400m

iTrader: (1)

I responded to your pm where you asked for more info on this so you can just edit this post here and substitue the info inif you'd like.

Dyno is definitly a great way to check your work but so is an wideband O2 sensor/AF gauge. You can just use those tools to try and set the ratio the way you like it and use a butt dyno afterwards to see wether or not you lie it.

AFR UI would say is good around 13.5 to 13.0 at higher rpms. This insures that the car will not ping and as a result pull timing out which will hurt your performance more, I should now, since I had a lean tune at one point and the guys at Church automotive enrichened my AFR's and got me more power.

Mike

contents from your pm

yeah you could do it yourself if you had the know-how but its something left to tuners.

Theoretically you could just use teh value chnages that correlate from the stock vtec point of 4800 and lets say 5000 and use that increment to show you how much you should alter the VT unmatch. So if you drop your VTEC to about 3800 lets say like some have (Cocoa) then you would try and match (proportionally) basically the air correction factor that the ECU normally uses when VTEC kicks in and apply it earlier on into the powerband to compensate for the added air. The compensation will not be as high as normal VTEC since the percentage of air added from VTEC then and earlier would probably be a little less for the latter just because of lower engine speeds but I imagine it would be qyite close.

So if you use an air correction factor before and after normal vtec point to see what the difference is you could probably apply something similar as a base VT unmatch tune and go off that.

Hope that helps a little. The most comfusing part is finding out how much more % of air you should tell the ECU is coming in to make sure your getting enough fuel but not too much or worse too little.

horsepowercrzy18

how in the worldd did you get 244whp?! i have the samee stuff as you almost exactly and im puttin 215whp

TCM 01 CL-S

What do you have again?

NightRider

Time to take it to the next level son!

NightRider

As far as VTEC unmatch, there is obviously only a certain amount of modding to be done to enable maximum results. I wouldn't recommend using a butt dyno as an accurate gauge of results unless you can feel amounts less than or equal to 5whp/wtq (yeah, right). With the maximum tq and hp numbers@given rpms plus the output dynamics of our engines, I would think that lowering VTEC engagement to anything below 4200-4400 would only hinder maximum output. As I said there is some math involved, but as long as the A/F ratio@VTEC engagement is within 10% of Stoich (14.7:1 AFR) if you are N/A, and from high cam engagement all the way to redline does not have a standard deviation from Stoich of more than roughly 2.5:1 AFR, you are looking good.

Did that make sense or have I been drinking too much?

gc86

Super confused, not fucking with the VTEC unless I take it to a shop.

horsepowercrzy18

thats soo weird that you put those numbers because i put 215whp with everything you have accept the plenums. and i tuned my air/fuel on the neo and didnt change the vtec engagement point. when i first got the neo i dropped the vtec point and it felt fast but it threw a CEL. never got to dyno with just vtec point changed. very interesting. im missin something here... your car works magic with hp or somethin