hi there hope you can help i have a new engine loom new 909 air injectors & a chip off msd & it seems like i have no boost control at all it hits 40+ psi boost & surges like a bucking bronco to the point that i back off b4 i break some thing ,would a i a w monitor tell me the problem or do i need to send ecu off to be checked out ,if so who to thanks 4 your help

 

did stu know the exact type of air injectors when he did the chip?

how much preload are you running?

 

pretty sure i told stu they were 909s &1/2 the pin pre load it bugs the shit out of me that i cant just bury the throttle

 

ask stu, give him your chip id, and make sure.

my single air injector has a resistor in the live, does yours?

you on a -31?

 

actuator thats recomended 4 t4 m8

 

as far as i know there is no resistor on injectors

 

just looked at car & yes its a -31

 

what colour are your air injectors?

 

there black with a grey top& i got them off a1 rally

 

there are a few types of injectors about, its worth checking its mapped for the right type.


make sure your actuator works aswell..


didnt you have this issue before? i thought you could never get boost down?


it may be the case you need your wastegate ported, and fit a bigger penny...

some t4s struggle with this, if the port isnt big enough, when the gate is fully open, you still make boost

 

had same problem with t34 aswell could i a w help as trev has this

 

proper 909 ,s dont need a resistor.
tim

 

worth a try...


is it the same actuator as your t34? it may be fubared lol

 

na its a new one m8

 

weird...

pull your arm off the gate, wire it wide open and drive it up the road, you should make no boost at all like that...

 

ill give it a go back in 15 mins

 

another thing if your inj arnt working its like having the pipeoff the actuator so will make max boost and then some lol all pipes right etc ? the blank on the end of the air inj with the hole drilled in it in the right side?

 

you have no need to wire it open just disconnect the actuator arm
but you have no need to to that test either
I suggest you plum the actuator direct to you pressure feed by passing the air injectors this will give you actuator pressure.
Have you checked you have battery voltage at the air injectors

 

if it has no boost your gate physically works, although it doesnt rule out the possible small port issue (opening the gate and contolling boost at 30+psi, is much harder than simply stopping it making any!)

maybe you have an ecu issue?

 

i dont think he ran air injectors on his t34 engine, but had the same issue...that leads me to ecu or feed, the loom is new iirc

 

and......lol

 

ok i just wired open waste gate drove down road 7000rpm 3rd gear & got 20.6lb of boost ill check 4 12v at injectors in a min will also try bypassing air injectors to ,& go straight from housing to actuator thats according to yhe secs monitor peak recall which was reset .

 

now ive never done that test on a t4, but 20psi with the gate wide open sounds alot to me...

 

Could it be a prob with the boost gauge not being accurate? When the rod snapped on my actuator (although only a t34) it made NO boost.

 

i imagen that was the reading from the secs or zeitronic, which uses the map sensor...

 

secs read 20.6, zetronics read 19.7 psi, zetronics uses military spec 5 bar map sensor

 

just checked voltage & got 12.57v ignition on& 0.00 ignition off on both injectors

 

so you have power to the injectors,

it could be your ecu is not earthing the injector, if you have an underlying ecu fault.

or the wastegate issue...


its just strange why you had an issue before on a different turbo. i assume your t34 engine used an amal valve?

 

me thinks ill phone stu & see if he can check it outfault wise &if 4 909 injectors

 

yes tim the hole is on the right side i.e.the actuator side of the injectors

 

it may be worth sending your ecu to stu mate, so he can check the repair and the boost control circuit aswell...

 

ill ring him tomorrow &see what he says thanks for your help mate

 

1) check injector isnt fitted upside down. Seen this before.
The elec connector end goes to turbo.

2) Connect actuator to turbo direct.
If still too much boost actuator / wastegate fault.

3) If boost now ok, AI fault. Do you know FOR A FACT that they actually work?

4) If you do know they work, the chip may possibly not have been programmed for AI. (I do make mistakes) Was your T34 chip set to AI when you had boost issues?

 

cheers stu i cocked up on part one. injectors are upside down i will test drive tomorrow &check if injectors actually work .

 

does the fact that with the gate open i still make 21psi boost good or bad & no the old t34 motor didnt have air injectors ,had new amal valve.

 

i tested the air injectors today they both click when power supplied but should i be able to blow through them when open???????????????? swopped injectors over so are up the right way now but still surges like hell???????

 

is the boost controlled now andy? or off the scale?

when you say surge, you mean chatters through the air filter on full throttle?

 

well yes but it pulls like hell then sort of coughs then nothing thenpulls then coughs (kangaroing )real violent so got 2 back off.

 

you got 83lbs in it now?

 

no mate still got the 1000,s but the closed loop keeps the afr spot on ,there on the to do list which is still getting longer.