l67 loosing power after 4000 revs

[BIG-EV]

Hey ive just converted a l67 into my wagon.. still using the ecotec fuel system. just wanting to know could this be causing a major drop in power after 4000 revs. i picks up great and boost even feels better but when i hits 4000 its starts loosing power and the gear change feels far away then it finally changes gear. it used to be misfiring at high revs to but i fixed that with some new sparkies. Its just a l67 running 8psi with yella terra split ratio rockers (1.9, 1.95). with a set of pacies.

also anyone know how to fix a squeeky supercharger pulley? only does it when its cold.

[delcowizzid]

probably lack of fule the L67 has a higher flow pump

[HARVZ-6]

Lack of fuel

they wont ping because of the knock sensors they retard the timing right back and you loose alot of power


try some beltgrip of the drive belt or tighten

[Boonz]

did you change the belt size to suit the smaller pulley? the standard belt is too long and the tensioner doesnt work as it should

[BIG-EV]

na same stock pully with same belt.. just runnin the 5% over driven balancer which makes 2psi more boost. Im getting it tuned soon with a uni chip installed. looking at a bosch 044 fuel pump 2

[Boonz]

the standard super6 pumps are decent for your application... id be changing to a smaller belt still cos if its slipping, the tensioner isnt putting enough tension on the belt

[BIG-EV]

bt is not running the super 6 fuel system its still runnin the ecotec 1

[Boonz]

a super6 pump is only $230 and doesnt need to any mod's to fit it in there, the bosch ones need some messing round to fit properly

[delcowizzid]

if you are going to get it tuned do it properly forget the unichip piggyback

[HARVZ-6]

bt is not running the super 6 fuel system its still runnin the ecotec 1

The l67 runs a higher rate fuel reg and bigger injectors,, probably a good investment

[BIG-EV]

im runnin the 36lb injectors