i remember reading threads about ap2s running very lean with bolt ons but cant find them. i have an 05 with an injen cai, berk 60mm tp, and now have a spugen 70mm single on the way. im currently using the stock header. i realize there would be benefits if i got a tune but will there be any harm in waiting?

 

I'd imagine without a header you should be ok. A ecu reset should be a fine interim step without worry about your cars health. But you cant say no to tuning :]

 

That's what I was thinking there will definately be a tune when the header comes. I've also heard that the vafc is fine for ap1 since it can only subtract fuel and the ap1s run rich but for an ap2 I would need something like a greddy e-manage ultimate. Anyone have input on this? Also if going with a emu what extras would I need like jumper harnesses or anything that doesn't come with the greddy. Open to suggestions, don't have to tune with greddy if there's something better/easier/cheaper.

 

Just installed my wideband last week on my 05 AP2 with intake, test pipe, and single exhaust. A/F stayed right around 12.5 under vtec and spiked at 13.5 during vtec engagement then fell back down to 12.5 to 12.8.

 

my ap1 with bolt ons is leaner then that. lol. wide band reads 13.0-13.4 before vtec and 15.3 vtec spike and back down to 13.7 13.8ish. and i dont even have a header on mine. im waiting for my greddy emu from giles so i can fix that problem lol

 

^That is weird why it is that lean NA. Doesn't seem normal to me. When I was NA with exhaust, test pipe, intake my afr's were dead set at 12.5 WOT

 

what kind of tuning options do the ap2's have? sepcifically 04/05's? Im looking to stay inside the STR class rules so I cant due a AEM EMS or anything. any other options?

 

The '06+ AP2's run crazy lean even when stock. My brother's totally stock '06 spikes into the 14's at VTEC. I'm not sure about the '04-'05 AP2's.

An ECU reset doesn't do much of anything unless you recently changed from crappy gas to good gas. The long term fuel trim will adjust for new bolt-ons in probably 30 minutes of driving.

 

I hear what you're saying. The only real benefit is to clear up old info that the ecu could reference. It's nothing major, but it's still a good thing to do to smoothen things out a bit.

 

You're going to want to switch up to a 70mm test pipe so everything is the same size. 60mm is almost .5" less in diameter than your exhaust.