so with my b20vtec, when i went to the dyno, the car would engage vtec, but when that happens, the power drops. you can hear the vtec engaging, and it's loud as hell, but there's no power there. anyone have similar problems or might be able to help? i was told it might be the rocker arms, but if the rocker arms are shot, the motor shouldn't even engage in vtec correct? idk, i'm so confused. could it be the tuning? but even with a bad tune it should be completely losing power when vtec comes in?

 

what header/exhaust are you running. to much restriction maybe and not enough air flow for high end

 

dc headers with old school trust exhaust. 2.5 piping

 

this one has got me stumped also. never heard of that. good luck on getting it worked out.

 

have you changed your fuel system(fuel pump-injectors,pressure regulator?if not , i think you should upgrade and get it tuned after that..
my friend had the same problem and it was solved by changing up his fuel system.. good luck....

 

try replacing ur dizzy cap rotor plugs wires

 

miner-dma i will try that, the motor has been sitting for a while

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fmrprojects &raquo;</TD></TR><TR><TD CLASS="quote">what header/exhaust are you running. to much restriction maybe and not enough air flow for high end</TD></TR></TABLE>

people run stock i/h/e on b20 vtecs all the time. not the problem.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miner-dma &raquo;</TD></TR><TR><TD CLASS="quote">have you changed your fuel system(fuel pump-injectors,pressure regulator?if not , i think you should upgrade and get it tuned after that..
my friend had the same problem and it was solved by changing up his fuel system.. good luck....</TD></TR></TABLE>

people run stock fuel system all the time, including me. not the problem. so jus eliminate these 2.

 

Sounds like cam timing. Had the same problem. Vtec engaged so loudly, it scared people driving next to me...but all it did was make noise, it didn't go anywhere. I just about lost to a stock CRX Si. I replaced the head gasket, and I found the cam timing was off a tooth. Fixed that problem, and the car pulls like it should now. Especially with a tune!

Good luck

 

b20powerda: so what would you suggest...?

loudassvtec: i'm pretty sure the cam gear timing is right, because i just had my timing belt replaced, also hybrid motor timing is always a bit off, but i'll def check it again.

thanks for the suggestions guys, keep it coming! honda-tech is the best!

 

when u went to the dynbo were u going to get it tuned? did u put it on a wideband? whats ur a/f ratio?

 

it was a while ago, i think it was 12 to 1 before vtec, then 10 to 1 during vtec, i know that's really rich, but should it still have absolutely no power at all tho?

 

whats the build and what kind of #'s were they?

 

yea try it .i would try a walbro fuel pump..
i drove my friends b20 vtec and vtec is still working very good...
good luck man...

 

like i said, stock bottom end, skunk2 stg 1 cams, everything else stock. it made 112 whp before vtec, then died...:-(

 

by died i mean no more power

 

Are there any check engine lights? Fuel pump would not be the problem either...

 

there was a o2 sensor cel i think, but i'm pretty sure the tuner fixed it

 

If u havent fixed the prob yet- my guess would be lack of oil pressure. Thats all i can think of as of now. A bad vtec solenoid would not let the motor engage in vtec but if its engaging fine but with no power i say there is low oil pressure.

 

A bad tune would also do it- run stock ecu
are there any odd noises?