wondering if you guys can make some suggestions just put the apexi V-AFC on the car (after this run) what do you think I should do with the fuel ...and that bump at vtec good bad? , insufficient fuel, inccorect vtec engagement? Just like to hear some comments...

 

Jeeze, is the blue one the end dyno run? The red one has the best numbers on it. You gave up4 ft lbs of torque for 2/10 of a horsepower. Is that a stock motor with vafc only? Those look like pretty decent numbers. VTEC does look kinda jumpy though.

 

9200 rpms?

 

what mods do you have ???

 

IF you are going to tune with the VAFC make sure the dyno facility has a wide band O2 sensor.

I think you should see more torque between 4000rpm and 5000rpm.

 

as you can see the end run was run 26,
yes I thought I should be able too fix the torque between 4000-5000,
mods are crower cams,springs, jdm 4-1 header, chipped p28,
funny thing the more I bumped up the fuel pressure the more power I made, I stopped at 62psi (with the vaccum hose off). Trust me I used many programs and the results are the same. Thats when I decided to use the V-afc to adjust the fuel,

 

I would try to move the VTEC point to a bit earlier, and you should get rid off the bump at the VTEC switch over point.

 

From what i can see, the blue line has more area under the curve, granted it doesnt have the highest peak number, but that doesnt matter if that run was making more power before peak.

 

you sure can benefit form running bigger injectors like 310cc , that way you wouldnt have to bump the fuel pressure so high

 

plot the air fuel curve. I'm sur there is more to be gotten with the mods you have.
O yea you need an exhaust bad man, that stock system is restrictive as hell and is probably holding you back some.

a) check timing
b) cam gears-have you adjusted those? Do you have?
c) remember to adjust timing when you play with intake cam gear


[Modified by FAST94GSR, 4:45 PM 5/19/2002]

 

I was thinking about bigger injectors but I didn't think I'd have too??

The exaust is not stock,

 

^

 

you will benefit from them , especially at top end

 

what year Lude injectors? cause the newer lude injectors won't work correct? only 96 or less???

 

??

 

https://honda-tech.com/zerothread?id=156586
this should help

 

http://www.allmotorhonda.com/techpages/injector.htm

 

Are the 97+ Prelude injectors 280cc or 290cc??? *confused*

 

thats with full exaust, powersteering ,and a/c

 

That list is kinda off...
97+ H22A injectors are rated 290cc and are saturated
93-96 H22A injectors are rated 320cc and are peak and hold

Andrew

 

question...why does power drop down immediately after VTEC in that graph? shouldnt it keep rising from that point til about 8000rpm? It looks like it kicks in nice and strong at first, but immediately drops back down and then starts to rise again....

 

Which crower cams? You need to see the a/f ratio and with a vafc you might pick 8whp. In my experience, messing with the a/f doesn't give you a whole lot of hp on top but lowering the vtec with a good header you could see 12hp in the midrange.

 

they are crower 402's,
I think that bump could mean improper vtec engagement point, but with my experience with perforemance cams they tend to like it a little higher....

 

You really need to see the a/f to really know what your doing. My guess is that you should be able to level your hp from that bump to redline with proper fuel management.

 

thanks guys