could any one help with my problem

ive got a civic ivt (sir) its a 1991, with a b16a1 motor, but its lacking performance. the car hits vtec but doesnt go any faster, tried a new distributor, new cams and rockers, new solenoid and lost motion assembly pins, but im stillstruggling to get any performance out the car, the cam timing is spot on, the oil ways in the head are not clogged
i pretty sure the cars hitting vtec cos of the change in engine note, but i cant get much above 85 mph.
could the timing not be advancing, when the vtec opens??
does any one have any suggestions that it could be,
thanks for taking the time to read my post...Deljoy

 

what kind of exhaust? you still running a cat?

 

check plugs and wires as well.. fuel filter..and run some injector cleaner through the gas tank

 

when you replaced the V-tec solenoid did you replace the pressure switch too? Or did you re-use the old one?

 

i replaced the pressure switch at the same time,the car hits vtec but then seems to run out of power, its got me well puzzled

 

im still running the cat, ive been trying to sort this then planned to stick an exhaust system on

 

replaced all the fuel lines,ran some injector cleaner through,and fitted new plugs, leads, and cap, but still wont go

 

what are you running as far as an ecu... i know some JDM ones have a low speed governer but i wouldn't think itd be that low. someone correct me if i'm wrong on this.

 

do a compression check on him to see if hes healthy. if they are low then you have your answer that hes tired and dosent have much left to give. now if they are all good numbers than i would be looking at timing again, maybe firing order

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deljoy &raquo;</TD></TR><TR><TD CLASS="quote">im still running the cat, ive been trying to sort this then planned to stick an exhaust system on</TD></TR></TABLE>

Is the cat plugged?
How about the check engine light, is it on?
How old is your air filter? It could be clogged with dirt, hindering performance.
Did you replace the fuel filter when you replaced the lines?
Another idea is that the filter (screen) on the pickup for the fuel pump could be partially blocked by dirt.