VS V6 supercharger cuts out under boost
Hay guys ive got a VS S2 with a Roots SC14 charger. Its frontmounted etc but as boost comes on it starts to cut out like its running aut of gas, get to 1.5-2psi befor this starts.
Running Standed ECU with tunned chip and ive changed the intake over the the other side and put the battery in the boot so i could run intercooler piping. Air flow meter is on the pressure side of charger and after the BOV so it only sees the air thats going to get used and about 250mm befor the Thorttle body.
Hope that sums it up Any help would be great,
Was thinking if I could use a VR loom as it has map sencor not an airflow meter if it would work with my computer!
on holiday
what size injectors who tuned it what psi pulley
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Standed injectors and its An OFF THE SELF chip. should only be running 4-5psi
on holiday
put your stock chip in and go for a blast be gentle the injectors will max out pretty quickly they arnt very big if it doesnt do it the tune is your issue.where in nz are you i may be able to help
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Im running standed chip now, Its nicer to drive but still wont boost. Im in Hamilton.
on holiday
regap plugs to 1mm or even 1.3mm instead of 1.5mm standard did you move the air temp sensor from the airbox into the pipe with the maf .it could be running out of fuel even ide be running 36lb supercharged injectors and a walbro intank pump
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Yep the air temp is in the end of the pod filter. Will do the plugs tonight, Bottom line is you think it needs fuel? Ive got a clubsport fuel pump and have some SS injuctors I could put in but got told there no bigger.
on holiday
put the air temp sensor in the pipe with the maf before the throttlebody so it can sense real air temp after the charger
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
You mean after the intercooler. Will it read PSI?
on holiday
no but it will read the correct temp so the ecu knows volume of air going into the engine it uses MAF and that temp sensor to calculate how much juice to feed in the temp on the cold side of the cooler is what you want it too read
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
on holiday
als if the maf is real close to the TB it can make it read wrong how accurate is your 250mm
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
I had a look and the MAF is right in front of the TB, 50mm max so would I need to move it?
on holiday
yeah move it a foot away if you have some pipe to test with air flows both ways through them and cocks up the readings when its too close
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Sweet ill get on to it and see where i end up.
Hay Ive moved the MAF 200mm away from TB and put the air temp sencer after the intercooler and reset the plugs and ran some injecter cleaner, It goes fine when under boost even if yest a bit but now when you come to a stop the motor stools or runs real bad and idle pulsing, I must have an air leak because its only running 2psi all the way to 220km as well or is that normal for a standed pulling on a SC14. What you think?
Last edited by WAFFEN SS; 22-08-2010 at 06:00 PM. Reason: Forgot a few points that were needed.
If your running 5psi on stock injectors and no rise rate fuel reg your running so lean its not funny. Thats your breakdown under boost.
Stock gap is fine under 8psi.
Hay IBLOWN can you let me no what you have done to yours. Ive got mine running but it stools when i slow right down or stop but idles alright if I unplug the air temp sensor. only running 2psi but dont no why because ive got the standed pullys on everything. system setup is Air filter into charger - BOV - Frontmount - MAF - TB. TB is on the drivers side. will get a pic up today.
on holiday
welcome to sc14's they need a pulley to make any real boost especially a tired old charger with a cooler . put up some pics of the setup we may spot something attached wrong making it idle weird
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Ok How do I put a pic on here it seems to only want one from a web site? I have pics on the computer to upload.
on holiday
click on go advanced when writing post scrol down to manage attachments add images must be small file size and correct format or it wont upload them
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
Heres the pics of my set up befor the changes you told me to make. Hope it helps, you can see the size of my intercooler and how ive made the intake manifold, 2 1/2inch intercooler piping, standed skyline BOV.
You really need to think about moving the T/B before the blower. Gets rid of so many problems. Have a look at one of my threads on my conversion.
From what i can see i think your MAF is too close to the T/B causing too many harmonics. Needs to be atleast 200mm away.
Another thing you can try is let it idle and disconnet the IAC. See if it stalls then.
and have :)
idle air control. the one on top of throttle.
and i use to only see 2psi of mine with the standard sc14 pulley on it. so think thats right 2-3psi.. plus will drop a little with the cooler..
but its a wicked looking set up .. did you make it???
my supercharged vt acclaimOriginally Posted by chargedvx6
http://forums.justcommodores.com.au/...claim-l67.html
Yep do all my own work. Overheated the standed motor so put this VT motor in with 10.2 to 1 comp and ported heads and all the other bits you can see. was 146kw without the charger so keen to get this sorted and see what we get out of it. What size pully do I need for 5 PSI?
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