Jump to content
SAU Community

Recommended Posts

Hey guyz,

Just got a small problem ive been noticing lately that when im pushing to car hard from around 5-6 1/2 rpm the car sort of stutters like maybe the car is trying to boost too high or not getting enough petrol what do you guyz think it might be or what can u recommend.

I have a 33 mods include greddy fmic, apexi pod and full apexi exhaust turbo back.

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/
Share on other sites

fuel filter perhaps? probably the easiest thing to try...otherwise maybe your afm is on its way out.

if your car is trying to get to higher boost then watch your boost gauge....if its spiking at all.....if you havent got a controller on it then it shouldnt be spiking.

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832158
Share on other sites

fuel filter perhaps? probably the easiest thing to try...otherwise maybe your afm is on its way out.

if your car is trying to get to higher boost then watch your boost gauge....if its spiking at all.....if you havent got a controller on it then it shouldnt be spiking.

With my mods it is usual to hit .70bar of boost, still running on the standard boost controller?

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832245
Share on other sites

depending on what boost you are running.... possibly coil packs, guessing they are std???

Plenty of threads on here regarding coils breaking down if it is :D

oh just noticed std boost - 7psi.... which 0.5 bar..... 0.7 is about 9-10 psi...

could be a spark issue.... my std coils broke down at 12psi....

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832313
Share on other sites

oh just noticed std boost - 7psi.... which 0.5 bar..... 0.7 is about 9-10 psi...

I thought they had a normal mode, and high mode? ... At a certain RPM the boost would increase from the standard 0.5 bar to 0.7 bar?

But yea, i would b checking the following

1. Fuel filter (most likely not the problem, but its cheap and easy to replace)

2. Sparkies

3. AFM

4. CoilPacks

Let us know how it goes.

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832358
Share on other sites

Yeah I'm pretty sure its 6-7 before 3.5, and 9-10 after 3.5Krpm

They are 5 psi till 4000rpm or round abouts (can't remember and can't be bothered looking at my workshop manual!) then 7psi after that

Dual stage, although most have already been ground out and run the 7psi all the time

R32 gtst's run 10psi

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832376
Share on other sites

Try the process of elimination, beginning with Ms. Nismo's advice :thumbsup:

Turn the boost down and see what happens, and change plugs.

awww fanks! Yeah definitely change the plugs whilst your looking in that area!

Take notice of the plugs... if a certain one or two are fouled alot more than the others then its not firing properly in that cylinder, so check those coils first...

You may just need to regap your plugs to a smaller size i.e 1.1 down to 0.8 or better yet grab some copper ones already gapped to 0.8. They are only a few dollars each. I have new coilpacks, new engine, new turbo, new everything basically and I still run 0.8 plugs!!

I ended up gapping mine to 0.6 with the dodgy coilpacks whilst waiting for the splitfires to arrive... sorted the problem temporarily.

Buuuuuuuuut its an elimination process... start with what's easiest for you and work your way through the list... you will find it eventually!

Link to comment
https://www.sau.com.au/forums/topic/217058-boost-problem/#findComment-3832396
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Version 1 aluminium airbox is.......not acceptable No pics as I "didn't like the look.....alot" Even after all my "CAD", and measurements, the leg near the fusebox just didn't sit right as it ended up about 10mm long and made the angle of the dangle look wrong, the height was a little short as well, meh, I wasn't that confident that Version 1 was going to be an instant winner I might give Version 2 another go, there's plenty of aluminium at work, but, after having in on and off a few times, and laying in the old OEM airbox without the new pod filter and MAF, there may be an option to modify the OEM air box and still use the Autoexe front cover and filter.... maybe This >  Needs to fit in here, but using the panel, and not the pod, the MAF will need to fit in the airbox though> I'm thinking as the old OEM box and Autoexe cover that is sitting in the shed is just sitting around doing nothing, and they are relatively abundant and cheap to replace if I mess it up and need another, it may well fit with some modifications to how the Autoexe brackets mounts to the rad support, and some dremiling to move it get in there, should give me some more room for activities, as I don't want to move the MAF and affect the tune Sealing the hole it requires to stick it in the air box is simple, a tight fit and some pinch weld will seal it up tight  I am calling this a later problem though
    • and it ends up being already priced in as though you're just on 91RON without any ethanol. Car will lose a bit of economy as the short and long term fuel trims bring down the AFR back to stoich or whatever it is for cruise/idle for the engine.  
    • Oh, you are right. But, in Australia E10 is based on 91RON fuel and ends up being 94RON. Hence it being the cheaper option for economy cars. The more performance oriented cars go for the 98RON fuel that has no ethanol mixed in. The only step up we have left then at some petrol stations is E85.
    • There is a warning that "this thread is super old" but they ignore that anyway...
    • With 10% Ethanol, we're talking 2-3% fuel consumption difference. The emissions reductions and octane boost in my opinion far outweigh this almost non existent loss.    My tanks sitting at 80%. Luckily that should go down fast as I'm on vacation again for the next two weeks. 
×
×
  • Create New...