Help! Engine Wont Go Pass 4500 Rpm

[luckingood]

hi guys.. i hope i could get some help with technical stuff here..

i have an RB20DET in my cefiro..

using dastek piggyback and vg30 turbo with fmic.

when i rev through to 4500 it seems stuck.. it wont go further..

engine's got enough boost but it seems to act like its on a launch control..

im pretty sure i put my rev limit on 7500 =S

and its really hard to start it when cold =O

the rpm just keeps dropping down.. and its not stable.. feels like the engine gonna stop any second..

wasnt a comfortable ride at all =S

really need help guys >.<

ive changed my fuel pump, oils, sparks... seems that im still having the same problem =S

[BANGN]

check your afm is plugged in

[No Crust Racing]

I'd be going for AFM or TPS

check'em both and let us know how you go.

[luckingood]

theres nothing wrong with my afm... i checked it.. no boost leak either.. well so far i checked....

what is the TPS thou?

could it be the coil? coz i f**ked up the socket.. dont know where to get them... =S

thanks guys.. much appreciated

[No Crust Racing]

Certainly could be a coil, if you've got coil issues fix them ASAP.

TPS = throttle position sensors. It sits on the side of the throttle body. If it's misaligned or damaged it will cause all sorts of weirdness,

Coils sound like a good starting point though if you know you have a damaged one.

Good luck and let us know how you go.

[luckingood]

hmmm.. ive checked it.. i think i have a boost leak.. i dented my intercooler..

and i have a crack on one of my coil..

oh.. where can i get the coil sockets thou?? how can i substitute them? like, aftermarket coil cables or something..

thanks bro, u guys really help a lot =D

[No Crust Racing]

Boost leak shouldn't stop you revving past 4500 but stranger things have happened.

What do you mean by coil socket? Do you mean the top part of the coil module or the long part that sticks into the rocker cover? Any cracks = bad but you can temporarily tape them up with elec tape (there is a thread on SAU about it, search for "damaged coils" "tape coil" or something to that effect. It's a pretty common thing to extend coil life.

If it's busted bad you basically have to replace it. You can use a stock one, or a new stock set or if you have power in mind you can swap them out for a set of splitfire coils whichn even with minimal mods, do give a power gain.

Cheers

[luckingood]

i think i found the problem.. theres a tiny hose running through the throttle body.. and the engineer sez it needs to be blocked.. it was causing the afm to misread everything.. so it felt like losing boost..

i cleaned the injectors and fixed the coil.. my 2nd coil was a bit melted.. =O but its still working fine =D

hope it runs pretty well after everything is assembled =)

thanks guys

[No Crust Racing]

Sounds good mate, be sure to confirm if that was the cause so this thread has an answer for anyone else searching.

Better yet take a pic and show us the pipe if that is confirmed as the problem.

Cheers

[luckingood]

yep.. i will do as soon as i go to the workshop.. =)

[luckingood]

YAY!!!!!!!!!!!!!!!!!!!! my engine is working normally now =D.....

so the story were, not a boost leak, not ignition problem.. its all in my dastek unichip wiring!!!!! i took it all out.. the chip and the turbo module.. and its all working fine now.. really smoooth...

im aiming for haltech instead.. so i wont be messing around with lots of sensors anymore.. it gives me too much headache..

phew.. after all that sweat going to the workshop everyday.. finally paid off ^^

hope it works for other ppl as well..

[JiN_MaN]

Ive got the same problem,

Wont rev past 5,200 hits almost like a limiter and if I keep my foot on the throttle it acts like the car is stuck in netural and slowly decreses in rev and speed.