can someone help me tune my Jun3s... fuel wise? I'd relaly love to hear some of the success you've had with fuel settings... by this I mean:

Did you use a vafc? hondata?

if so, tell me what your original ecu setup was, and how you altered it to make it work.

what size injectors?

what fuel pressure?

I realize this has been posted before, but I failed to find much of anything searching...

I'd really really appreciate the helping hand

 

im running a mugen spec p-28 with a vafc. stock injectors

 

have you dynoed? what is your vtec at?

 

im using a chipped p28...
i have a vafc too but i only used it for my vtec engagement

i have stock injectors and my fuel pressure is on 40..

i havent dynoed my car yet but im expecting more...

vtec hauls *** wen u can take it up to 9000...

 

If you want the least amount of headaques get the JUN ecu (plug and play )

 

I have my fp at like 55 psi at idle. I am gonna rechp my ecu next week.. i am trying to decide how to have locash chip it

sam

 

what vtec do you suggest, and I was thinking of taking out fuel up top and adding some down low... what do you think of that?

 

I wouldnt do ANY fuel adjustments until you get it on the dyno. The butt-dyno is so unaccurate, plus your gonna need a wideband O2 sensor.

 

Stock Intake
Stock Head
Stock Exhaust
CTR Pistons
SMSP Header
Jun 3 Cams
Hondata
Stock Fuel Pressure

 

the big thing for tuning JUN III is the fuel and cam timing. I believe 0,0 is the recommended setting from JUN. My fuel pressure is at 50 psi at idle with the vacuum line on. Im running ctr pistons. Whats everbodies fuel set at and what ECU are you using. Also you peaked early for the JUN III cams. Ive usually seen them peak at the 8700-8800 rpm range


[Modified by RLukas, 8:42 PM 5/2/2002]

 

can people PLEASE post their fuel settings and what ecu they are using. Both of these are crucial! Thanks a lot

-sam

 

fuel settings?? lol
i sincerely hope you do not mean AFC settings.

RLukas: Im sure the stock intake and exhaust could have contributed to the
early peak. Also, NEVER quote pressure figures with vacuum

 

I mean, where did you add fuel and where did you take it out? Im trying to find a general trend with these cams in relation to certain ecus.

 

thats the thing, you probably wont find a general trend

 

DYNO, every engine is different..SGT your right,stock intake and exhaust probably contributed to the early peak. But those are damned good numbers for no intake and exhaust. You tuned it right? Hondata for me soon

 

Yes, that was me.

 

my fuel pressure is set at 48 psi but like everyone said, u gotta dyno it

 

VTEC can remain at 5700, Add more fuel at VTEC point with fuel pressure at 70psi and take away fuel at idle and at 8000+ rpms with your VAFC. Also if you keep the stock VTEC point, disconnect the VTEC wire from the VAFC.

0,0 cam settings is good (But make sure it is really 0,0)


[Modified by t, 5:32 PM 5/2/2002]

 

dont expect the stock pump to last that long at that pressure

 

What sakai said.

 

...on a related note: Whenever the subject of JUN 3s comes up someone says "JUN ECU". Has anyone cracked this program to use as a starting point for Hondata?

Eh?

 

We tore a JUN ECU apart, its completely differant on the inside, they change the processor and what not.

 

what he said.