im not very knowladgeable when it comes to tuning so i was hoping i could get some feed back on my a/f part of my dyno. i was wanting to retune ank keep the a/f around 13.8-13.5. would this be too lean also shouldnt the a/f stay more constant , not fluxuating so much? it seems like it is kinda dying off on the top end as the a/f is more rich in this area. my tuner says he would reather keep it rich so it dosent detonate . im just looking for some insite like i said i dont know alot about it, so please give me some help
the set up is
b20vtec
b16 head race port by steve deandrea @cccylinderheads
supertec flat faced valves,ret,and springs
s2pro2 cams(Degreed)
victorx i/m port matched
pro products 68mmt/b
b20block 84.5
rs itr rep pistons
arp bolts
hytec rep header
basic cookie cutter b20v setup.
best 1/4 time is 11.99 @111 w/1.74 60ft in 95 hatch thanks ahead of time

 

wtf?.. Honestly I think you need a new tuner.. That a/f graph looks like ****... Look where you lean out between 7 and 7.5k you make more power.. Obviously thats whats going to happen, but thats way too lean...


I just came from my dyno session today and the tuner was having issues with his software, but my b20 pulled out 204 whp and 146 lb torque.. Did not get to tune at all.. On top of everything his dynojet reads lower then most dynos around here. Your motor should be pushing way more power..

 

i think you should be able to break the 240 whp mark

 

At work can't see the graph, what are the HP and TQ numbers? Was this done a dynojet?
Why did you choose the Victor X over the Performer X IM?

 

The A/F doesn't look too bad. Just have him lean it out a little bit from 8000 to 8600. Your 1/4 mile time says a lot too.

 

The A/F could use some smoothing out but the tune is not that bad.

 

Was it tuned with a sensor in the downpipe, or a sniffer in the tail pipe? If the latter, that af graph could be off even more than we are seeing. From my experience, using the sniffer causes a leaner reading. This is more true when setups have an older cat, resonators and the type of muffler and number of exhaust leaks. I've seen up to a full point difference from a dyno's sniffer to my wb in the dp.

Either way, get a different tuner or tell your current tuner to lean out your top end some. I'm sure you'd gain quite a bit more power that way.

 

sensor was in header in o2 location , exaust was 3in vrs , same as kteller.

 

I think this is the type of A/F they are looking for, but when you zoom in to a tighter resolution it gets a bit bumpy.

 

The AFR's don't look bad. The scaling is very narrow, so any variation will be exaggerated. I see a maximum of 13.3 and a minimum of 12.6. Not bad, not great either.

You can also see a good correlation to the AFR’s and dips/spikes in power. Looks like your engine wants AFR’s in the 13.3-13.4 range. A taper to 13.0ish would be fine for your high engine speed area, 12.6 is very safe.

Posting a screen-shot of your ignition table (high and low cam) would provide us much better direction in terms of potential for more power. It is hard to say with the smoothing at 3, but change smoothing to 5. If that ‘spikeyness’ still appears in your high cam, your engine is asking for more ignition advance.

 

thanks for the imput going to the track tommarrow than gonna retune for next weekend and see how much difference it makes.

 

wait dyno jets read lower, lulz.

 

????? i dont understand this. what dose this have to do with my questions? im not trying to get some huge dyno #s , im just tring to get some insite.

 

i was always taught flame front travelled the fastest around 12.5:1 but, then again, every engine is different, and respond to things differently.

 

breaking it down to help you understand what you're seeing here. Hopefully this isn't too critical. (yes I'm picky)

4500-5200 - lean it slightly, notice the bump in power at 5200 when you went to 13.25, I'd aim for that.

5200-5650 - obvious VTEC transition, obvious minor A/F issue, obvious ignition jump when moving from low to high cam maps. (serious dip in power)
try VTEC at 5750 instead of 5500.

6250-6550 - slightly leaner, aim for 13.25 in high cams. Potential ignition problem as well. (dip in power)

6700-7500 - slightly richer, again aim for 13.25 in high cams. Potential ignition problems again. (down turn to slope of power output)

7500+ - again 13.25 seems to be where your engine likes it. And again likely ignition problems.


if you take a ruler and place it on the points from 4500-5300 it should line up with the points at 6100 and 7000, that's where you want to be.
Your power output isn't going to be that straight, but the dips and peaks shown in your graph are a sign of a tuner that was either seriously rushed, doesn't care, or has no idea what they are doing.

another 10hp+ should be there for you with the right tune. Easily a 220-230hp setup.

which program are you using?

 

not sure what your asking about program, my guess is your asking what engine management , im using s200. thanks for the help. any more sugggestions are appreciated.

 

tuned on what?
The tune needs cleaning up, but good numbers.

 

not getting what you are asking . fuel? or tuning program? its 91oct. is this what your asking?

 

program.

 

 

A/F needs to be straightened out, and the peaks and dips are not from a lazy tuner, that is inherent of a Victor X with descent sized camshafts.It looks like it could use a little more timing in spots. The only way to smooth that torque curve is to put a different IM on it, or put some ITR cams in it. Could use some compression as well, that torque number is low for a 2 liter with Pro 2's, just my opinion though.

 

glad to hear you say this . i did not post to put my tuner on blast. this was for me to learn and be a little more informed, so i had more understanding before i made any changes. again thanks for all the imput.

 

the tune will not destroy your motor barring the timming isn't overly agressive. you'll be fine. retune and pay the tuner for extra time for fine tuning and more power

 

focus on narrowing a/f btwn 7.0 to 7.5k where your motor uses the most fuel. once you narrow that a/f you use that as a guide for low end and top end. prolly bit more ign adv on top or your plugs are too cold, maybe back down to a 6 heat range if you're using 7, etc.. your tuner is prolly jsut playing it safe on top but still a bit too safe, can lean out slightly.

 

care to share ign maps?