S2000_916

s2000junky
i think i read a post in the past that you said you've never seen a 00-01 with bolt ons run lean? does that sound right?

s2000Junky

That's correct. These ecu run really rich, and the flow of the engine in secondary cam when lowered still doesn't get too lean when ecu thinks its still running primary cam/fueling. You will end up trimming fuel typically from 2500 rpm up to the new lowered vtec transition, say 4k, and then start trimming more fuel again around 5500rpm and then again about 8k to redline. These corrections get you a flat fuel curve on a lowered vtec ap1 with a vafc/neo. Ap2/04-05 similar but to a lessor degree, and actually can end up needing to introduce a fpr into the mix to add fuel in the mid range where vtec was lowered. The F22 just breaths better, esp in the lower/mid range rpms and the factory ecu fueling is more dialed in from the factory not leaving as much leeway when you start improving the breathing.

davidc1

My mom was an english teacher so I can't resist the urge to offer this correction...

it's AP1 vs. AP2 or AP1 versus AP2


now I feel better..sorry

Mike RT4

Looking at the above, she obviously didn't teach you very well then LOL..... .

hatalu

AP2 VTEC at 3600rpm tuned by Gernby with Toda Header, savag exhaust system, intake and FD4.77 really brings car alive... 0 lag time, you always on VTEC... very large torq and quick = fun~!

Chuck S

Makes VTEC Yo! a thing of the past. During a standing start acceleration the car gets to VTEC at 3600 rpm and stays on that cam if you shift at the red line

-- Chuck

s2kpotenxixe

5600 - 5800rpm for an ap1 is more usual I think