cam switch on my b20vtec
07-24-2011, 07:52 PM
#26
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Re: cam switch on my b20vtec
Thats only recently.. Toda was originally doing that before skunk2 decided they were going to.
The tuner series cams, buddy club, brian crower, crower, all these cams follow the honda profile line up, 1 small primary, 1 decently sized primary, then a vtec lobe.
The pro series does not have two of the same size primaries, they simple have a big one, and a med one,.. Toda, i believe the toda's Ds have two big primaries.
I know that my cams offer "2" big primaries.. Also have found that the low end and midrange compared to other cams that have one big primary/one stockish sized or two med sized primaries is better. If a motor flows enough air down low it will absolutely fly when a correctly designed cam.. Most people forget about low / mid range in a street car..or even when you're falling back into your power band.
Reving higher to take advantage of a cams power range isn't bad. This mild comp b20vtec is built and is fine to do so, The OP seems like he's alittle scaried of revs, but he has no reason to be. With that said, if you are looking for more low / mid range you'll want to do alittle more research on how well your actual motor flows in pre vtec rpms..
The tuner series cams, buddy club, brian crower, crower, all these cams follow the honda profile line up, 1 small primary, 1 decently sized primary, then a vtec lobe.
The pro series does not have two of the same size primaries, they simple have a big one, and a med one,.. Toda, i believe the toda's Ds have two big primaries.
I know that my cams offer "2" big primaries.. Also have found that the low end and midrange compared to other cams that have one big primary/one stockish sized or two med sized primaries is better. If a motor flows enough air down low it will absolutely fly when a correctly designed cam.. Most people forget about low / mid range in a street car..or even when you're falling back into your power band.
Reving higher to take advantage of a cams power range isn't bad. This mild comp b20vtec is built and is fine to do so, The OP seems like he's alittle scaried of revs, but he has no reason to be. With that said, if you are looking for more low / mid range you'll want to do alittle more research on how well your actual motor flows in pre vtec rpms..
07-25-2011, 04:46 AM
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Re: cam switch on my b20vtec
lol yes im affraid of revs but first things first im def getting it dyno tuned as it is then from there i can see what may need to be switched around who knows i may like it alot better once tuned but i would def like a shorter geared tranny that will make up for a lot of the lack in low end power
If it has a good street tune on the car, it should take about 20-30 mins max on the dyno to fine tweak ign and other things, like cam gears.
You have no reason to be afraid of revs.. i dunno why you have that in your head at all.
07-25-2011, 04:56 AM
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Re: cam switch on my b20vtec
well it was street tuned already but ign timing wasnt really played with and it runs a bit rich still plus my cam settings are at what brian at skunk2 said the quick setting are which is +4 on intake and exhaust so that can be played with a bit to
07-25-2011, 11:31 AM
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Re: cam switch on my b20vtec
the tuner2's usually like +2/3 on the int and -1/-2 on the exhaust...this is normally what i've used on stock or std piston sizes up to 12.0cr...just a thought maybe you need to retard your exhaust a bit..
07-25-2011, 12:50 PM
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Re: cam switch on my b20vtec
Make adjustments, if the car feels better. then retune it, cam gear adjustments aren't going to throw your tuning AFR off by THAT much.. maybe .3-.4 if that.
If you make adjustments and the car goes lean, that is good. That means its burning more fuel and making more power.. you'll need to go back and retune those areas.. tuner cams rarely like to be adjusted to the same point of each other.. they are a overlap cam.
If you make adjustments and the car goes lean, that is good. That means its burning more fuel and making more power.. you'll need to go back and retune those areas.. tuner cams rarely like to be adjusted to the same point of each other.. they are a overlap cam.
07-28-2011, 04:31 AM
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Re: cam switch on my b20vtec
so i have my cams set at +3 intake and +1 exhaust it leaned out on the low end and a lil in vtec but im def gonna have to go back to my tuner and have the low cam air/fuel redone. at vtec engagement its a bit rich it dips to around 12.2 then leans out a lil in higher rpm. im gonna retard exhaust cam maybe another degree and see what it does
07-28-2011, 06:28 AM
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Re: cam switch on my b20vtec
so.. leaning out eh?? That means the car is making more power... 
Get it retuned.. those cams like overlap.. for your motor the max i'd run is +4 intake -2/-3 exhaust.
Get it retuned.. those cams like overlap.. for your motor the max i'd run is +4 intake -2/-3 exhaust.
07-30-2011, 07:40 AM
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Re: cam switch on my b20vtec
ok i changed the settings on my cams again this time +3 intake -1 exhaust and it leaned out even more so i parked it up til next week when i run up the road and let my tuner street tune it again but i do have a question about vtec engagement. its set at 5300 right now but im not sure if its at a ideal spot
07-30-2011, 06:52 PM
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09-14-2014, 04:45 PM
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Re: cam switch on my b20vtec
i see no reason why the op's motor with some good fine tuning and maybe a few extra parts like a velocity stack etc cant make damn near if not 200hp. it would also likely have a nice fat 140+ ftlbs id say centered around 5500-6000 rpm. likely maxing out power around 8000 and dropping a bit by 8400 so he can have his earlier limiter. (i did a lot of reading on this type of setup over the past 2 years, and am almost done building this same motor, but on 82mm not 84mm)
honestly though, the biggest thing here is get the car on a dyno. the street tune doesnt sound far off and the rest of the tune will happen in an hour or 2 max
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