monaro intercooler and 17psi installation problem

[redcv6]

well boys and girls, as some of you may know i recently intercooled my l67 monaro and fitted it with a 17psi pulley. now it runs fine when you don't push it and even up to 4psi runs normally. once it passes about 4psi it starts stuttering and carrying on, the best way to describe it would be like when traction control cuts in. jerks and splatters. now if i had to say anything i would put it down to a tune, but i do not want to go spend $1000+ on a tune then find out there was another problem so i have to go fix that then get another $1000 tune. now so many things have been thrown around, from spark plugs needing to be re gapped to just not enough fuel. IS there a way to find out exactly what is happening? or would anyone be able to pin point something with the description i have given you? i should also add it struggles even more under load even if its still on the same psi as on a straight road.

cheers guys

[HARVZ-6]

Id track someone down with a scan tool to plug in to find out what the computer says it going on mate..

The computer on a l67 is bl**dy good for factory chances are itll know exactly whats going on

[H1GHROLLR]

did you upgrade injectors

[redcv6]

nope, injectors are fine for my power output.

this scan tool sounds interesting. im guessing it is used whilst the car is being driven?

[VL Berlina 5speed]

get the AF ratio check then and if its off get it tuned to suit
if its leaning out you will melt your pistons

[redcv6]

^^ melting pistons does not sound like a fun time.

[VL Berlina 5speed]

yer a tune will deff be cheaper then leaning a motor out
just get dyno run and check the air fuel ratio,

if you have any probs then get it tuned to suit

[Wagon_Wheel]

What sort of boost was it running before hand? Sounds like a fuel related problem to me

[redcv6]

could run 5-6psi(6psi pulley) before intercooler no problems. cheers guys

[azkwazere]

right, so you think that 17psi will be fine then?

Sort your fuel system out man.

What sort of pump? Injectors? regulator?

aZk.

[H1GHROLLR]

sounds very much like you might need bigger fuel pump,bigger injectors and a swirl pot/surge tank maybe even bigger injector rails

[redcv6]

all standard, all should cope just fine i am led to believe.

[redcv6]

this all sounds very expensive

[H1GHROLLR]

not so sure on that mate even with big N/A builds you have to upgrade like you said before the worst thing you could do is lean it out you will be left with nothing then

[redcv6]

thanks heaps mate.

[H1GHROLLR]

no worrys mate

[Jecs]

044 pump, surge tank, bigger injectors, tune. will fix your problem

[ScoHar]

running 17psi on factory fuel system won't hold up (for long anyway) you'll end up melting a piston or such, your traction control stuttering feelings is prob detonation or similar. NOT GOOD.

[VX_Calais_Sv6]

lol at all the comments, if you dont know what your talking about dont suggest things like 044 pump, surge tank, bigger injectors. The stock L67 fuel system is more than fine to handle 230+rwkw same with the internals.

To start with;
which brand intercooler have you got? (YT, FIT, MACE or other)
Where is your boost gauge connected to?
What other mods do you have?

[VN_Luke]

lol at all the comments, if you dont know what your talking about dont suggest things like 044 pump, surge tank, bigger injectors. The stock L67 fuel system is more than fine to handle 230+rwkw same with the internals.

To start with;
which brand intercooler have you got? (YT, FIT, MACE or other)
Where is your boost gauge connected to?
What other mods do you have?

you can't expect to ram 17 pound of cooled air into something that was tuned to run 6 and have it work safely and nicely

The injectors and pump should be able to support a decent amount of power, but you need to tell the ECU to inject that amount of fuel in!

(I don't know) - Can the MAF measure this amount of air? when does it max out?

depending on what the stock tune is like, you could be either;

1) hitting 'boost cut'
2) passing the limits of the MAF and not supplying enough fuel for your needs (leaning out)
3) hitting bits of the mapping in the tune that were never meant to be hit - which will be mapped to damn rich so that you don't melt pistons. (i.e. running massively rich)

or any combination of the above 3 (or a bunch of other stuff)

the best, most cost effective and safest thing you can do (besides familiarising yourself with the PCM and it's operational workings, then diagnosing the issue yourself) is to take it to a dyno shop that deals with remapping the factory ecu (I believe anyone with a kalmaker setup can do this?).

This way you put $3k worth of motor in the hands of someone that knows what they're doing

They won't charge you for a full tune if there is something obviously wrong (i.e. sensor unplugged, or something like that)

they should also be able to tell you off hand, from previous experience, what the limits of the stock fuel setup and MAF etc are.


The best thing about it - after you do spend money on a tune, you know you have a car that's running to the max of it's potential! (which @ 17psi with an intercooler should be pretty damn good!! )

[VX_Calais_Sv6]

I was running mine around un-tuned for a few weeks no problems (17psi & A2A intercooler). If he is running a w2a cooler they are "suppose" to be fine without a tune. Having problems at 4psi tho sounds like you have other issues other than the car needing a good tune. The MAF is fine for those mods too.

Could be as simple as spark plug gaps, gaskets leaking, or if its a MACE cooler than problems with the PVC.

[stocky]

yeah agreed with luke. dont go telling the guy to spend thousands on injectors and fuel pumps when theyre most likely not the issue. if hes having issues with it around 4 psi, then the injectors shouldnt be the issue, as theyre designed to run over 6 psi. i would say you just need it tuned properly to suit the new boost level

[VX_Calais_Sv6]

hmm looking into it a bit more your off the l67 site yeah? If you have tried as suggested; checking all vac hoses, replace leads, regap spark plugs to 1mm; then it would be worth heading to a workshop to get them to check it out. try scotty at Chipcontrol - Dynamic Performance Tuning (VIC)

[ScoHar]

also don't forget to check all the boost pipes (the ones that have pressure in them)for leaks, as this can be mis read by the ECU

[AirStrike]

Tune man!! you can't just chuck a cooler and 17psi pulley on and away you go. Is it a W2A or A2A cooler?