H22A8 vs H22A7

YouTube · Post by **Sailor** » Sat Jul 28, 2012 11:49 pm

chrismc wrote:
Sailor wrote:
chrismc wrote:From my experience the ATR map is more aggressive with an immediate noticeable jump by about 20HP as it hits VTEC- not subtle or ideal at all IMO.
I like it like this. Even though it's harder to keep it on cam because the cut-in is at higher revs, the surge is fun can occasionally be quite handy.
True enough- I just got fed up with having to rev my ATR to within a gnats of the rev limiter to keep it in VTEC though...

Also true.
My preference would be to lower the threshold by a smidgin, maybe down to 5600 or 5500, but no lower. I'm just not inclined to spend money on a controller.

Post by **lewd lude lover** » Mon Jul 30, 2012 1:28 pm

Im not keen on the harsh changeover myself. it shows that the map has been fuddled with to drop a little torque just before VTEC so you get that surge.

much better to have a smooth curve and a soft changover imo. mainly because you are actually getting to point B faster.

I dont know about anyone else but i rarely drop out of vtec when im having fun. you just need to take the revs higher

chrismc · Post by **chrismc** » Mon Jul 30, 2012 1:48 pm

lewd lude lover wrote:Im not keen on the harsh changeover myself. it shows that the map has been fuddled with to drop a little torque just before VTEC so you get that surge.

much better to have a smooth curve and a soft changover imo. mainly because you are actually getting to point B faster.

I dont know about anyone else but i rarely drop out of vtec when im having fun. you just need to take the revs higher

I think the dropping out of VTEC issue is ATR specific- its the only Honda I know to be so critical with it....

Post by **4thgenphil** » Mon Jul 30, 2012 1:55 pm

chrismc wrote: I think the dropping out of VTEC issue is ATR specific- its the only Honda I know to be so critical with it....

its all in the gearbox ratio's

bennyboy · Post by **bennyboy** » Mon Jul 30, 2012 3:02 pm

No fear of dropping out, mine's at 3,800rpm

I've heard that before about the ATR though, guess it's a just a mix of the particular setup, as Phil says down to ratios too.

Post by **4thgenphil** » Mon Jul 30, 2012 3:05 pm

bennyboy wrote:No fear of dropping out, mine's at 3,800rpm

what cams are you running bennybigballs?!

thats friking awesome

bennyboy · Post by **bennyboy** » Mon Jul 30, 2012 3:14 pm

Ha, that did make me

Just the standard ones Phil, it's just what works on my setup.
Rich said it's a bit of a freak as I actually get what feels like a change at about 5.5 - 6k, and he's only seen it once before, also on an A8 with a Solid Fabs mani. Reckons it could be down to the way the mani is made

It's very smooth though and the noise is more than the kick, I was worried about being on teh motorway but of course VTEC needs a certain throttle % to activate, so just cruising in 5th is fine, all you do is put your foot down a bit and instant X-over

Post by **4thgenphil** » Mon Jul 30, 2012 3:20 pm

sweet! what mani have you got then? i like the thought of dropping the vtec x over a bit

bennyboy · Post by **bennyboy** » Mon Jul 30, 2012 3:32 pm

Its a Solid Fabrications one, by Alan, at errr Solid Fabrications

(see here for piccies)

Before that I had it set at 4.5k, which is a sensible drop for a slightly tuned H22, I ran mine like that for years.
IIRC the Prelude is one of the few VTECS that has a very noticeable drop before changeover as standard, something to do with emissions and the 2.2 being a 'large' engine for Japan, so helps with mpg etc I believe.
Mine also has adjustable cam gears, wonder if that plays a small part too

Edited to say there's a dyno printout in that thread too, so you can take a butchers

vtectom · Post by **vtectom** » Fri Apr 18, 2014 10:24 am

Found this thread looking for manifold info.

Is an h22a7 manifold a direct fit on a bb1 h22a
please?