having greif with a c1j

[dave r5]

hey all im having trouble with getting a c1j to produce any boost.

standard engine
alloy standard sized i/c
d7 drag turbo ( from gt tuning brand new)
new plugs leads rotor and cap
standard carb freshly built 1.2 mm main 0.9 air corector
samco's all new

NO dump valves
a known working aei
cup mod
scorpion exhaust

i can get a slight chatter from the turbo at about 6 k
this is in neutral and on the road

done a comp check
120 psi
110 psi
120 psi
120 psi

piston 2 isnt drasticly down but obviously worse then the other 3

no way of testing afrs in this car either but does smell rather rich


whats next ?

[Kris M]

Boost leak ???

[TrixNFlix]

Rather low compression results.:scratch:Maybe boost leak as kris says. Wastegate staying open? Try with the actuator vacum pipe off, take it easy though as you cant tell what the engine is fueling.:scared:

[dave r5]

Nope no boost leaks all pipe wrk is brand new out the packet along with I/c
Had the turbo off, penny washer is in tact.
Actuator pre-load is set to max (just for testing)

Got me really stumped

[markey b]

is throttle cable adjusted properly? is it opening throttle fully?

also are tappets ok? if they are too tight could affect compression

[car.crash]

How did you test for boost leaks?

[RussellT]

when you say "any boost" do you mean that it is making no boost at all?
Does it drive like it has no boost ie like a milk float? if not is your gauge plumbed in correctly without a leak.

Assuming that your gauge is working and its not registering any boost at all then your brand new turbo is a dud.

[dave r5]

Russle I had this convo over the Fone with haz. Wipped off the turbo and exhaust housing and all looked ok, but did notice a crack in it. Gona try a t2 on it and see wat happens.
Will post specs of turbo up in a min. As I say it's classed as D7 drag turbo on gt tunings web site.

[SCHWARTZ]

if its a "drag" turbo im guessing its big and dosnt make any boost till quite high up the rev range with the engine under load. Did you test the boost circuit with a compressor?

[dave r5]

May have found the cause for this.
The exhaust housing has a major crack in it
And the gap between the exhaust wheel
And the housing is oval, and quite big.

Also only 3 straight push rods

[Os8472]

May have found the cause for this.
The exhaust housing has a major crack in it
And the gap between the exhaust wheel
And the housing is oval, and quite big.

Also only 3 straight push rods

ah, not so good, bent pushrods do hold tings up abit:(