Jump to content
SAU Community

Recommended Posts

Hey forum I need some assitance please. Does ne1 know what this problem can be, firstly I have a 95 gtst with a few mods simple stuff an ebc lo boost setting 11psi iridium spark plugs gapped at 0.7 and my stock air box was replaced by an air filter. The problem is when boosting especially in second running say at about 5000 rpm onwards boost at 11psi the car feels like it lunges forward then drops off then lunges againg does ne1 know what this can be and the boost guage shows the boost following the same pattern falling off to say about 9psi then back up to 10 or 11psi. i was wondeing if the car is miss firing or is this another problem any help would be greatly appreciated.

Link to comment
https://www.sau.com.au/forums/topic/149683-does-neone-know-what-this-can-be/
Share on other sites

Does your ebc have over boost protection? Most do and what you have described seems to match how it performs.

If it does, check the settings and make sure it isn't set too low

Yes it does have overboost protection which I have set to 16 psi. Im not an expert on these kinda things but doesnt that seem a bit high for stock boost the 16 psi and those few mods also i dont think its the overboost protection cause when it is activated it alerts me and it doesnt alert me when this happens. It just does this normally. Besides the mods I mentioned everything is stock do you have any suggestion for my boost settings at the moment they are lo 12, hi 15, over boost warn 16, wastegate starts to open at 3 and when over boost is initiated it limits boost to 63% of 16.Also there is a settingnamed gain that opens and shuts the wastegate 100% being the quickest and 1% being the slowest I have that set to like 30% but if I redline first or second and third i get the over boost warning. Wat can it b? Any help is appreciated. Thanks.

Me too, but i bet if you check coils/plugs etc you will find its misfiring and when it does this you loose power then get it back and it feels asthough its 'lunging' Check your coils for hairline cracks and signs of arcing. If your not sure how to do that get a mechanic to. They will instantly be able to tell you if its misfiring with a drive of it.

Deren

Me too, but i bet if you check coils/plugs etc you will find its misfiring and when it does this you loose power then get it back and it feels asthough its 'lunging' Check your coils for hairline cracks and signs of arcing. If your not sure how to do that get a mechanic to. They will instantly be able to tell you if its misfiring with a drive of it.

Deren

Lol yea it is a big pain in the a$$ I been having headaches and migraines trying to figure this $h!t out and I'm a total noob.Like you said I'll just carry it to a mechanic and spend a couple of bucks rather than completely f up my ride.

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

    • Thanks Duncan! Yeah it's street use for me only. Maybe occasional track day. Any difference in noise when running with the two pumps? I would expect the lift pump to be more quiet than the main pump so hopefully not? And yes, unfortunately quite a big price difference to the simple hanger setup. Though I'm usually willing to trade money for better reliability and future-proofing. Buy once, cry once and all that. I'd be very happy to never have to deal with fuel pump / wiring issues again  
    • The old manifold was quite under the GTR strut brace.  The new manifold is quite [unknown] the GTR strut brace. The GTR strut brace was needed to clear the bonnet vents. The Old strut brace will almost certainly clear the new manifold, but not the bonnet vents. The old strut brace will almost certainly clear the new manifold, and the new bonnet without vents. But I am hoping the GTR strut brace clears the new manifold :p
    • On the bright side, at least you knew that it happened and remedied before anything happened. A friend of mine just took his Fiat 124 to a shop for an oil change and they didn't tighten the oil filter housing properly. 4.5 quarts spewed out and even after refilling + tightening the cap the engine has a tick now.
    • So, more pain. The FAST manifold is a little larger than the stocker. This is problematic because there really wasn't much clearance to begin with, so going from 'barely enough' well into 'no' is sad based on the external dimensions of the thing, even though where it bolts to the head is the same. Result is the fuel rails sit a good 25mm higher, and this is a bit of an issue with the wiring that runs behind the motor, and the fuel lines, and everything else. When pushing the manifold on, it required a huge amount of force to crush wiring looms to fit it, sensors like the MAP sensor are about 1mm from the firewall, and the FPR just has to bend ABS lines to be forced into place. After some brainstorming and some sad drinking, the loom for some reason ran from the grommet behind the ABS sensor, then to the driver side head, then back to the passenger side head. So all of this was pulled back and stripped, a few wires cut and rejoined, so that the 'branch' was now on the passenger side's head as below: Before you basically couldn't see anything behind the driver head. This is much improved! The MAP sensor is now pointing up (instead of at the firewall) Brackets have been made up for the rail. The rails are for a LS1, the manifold is designed around a LS2 as it's base. Which of course has slightly different bracketry and water pump clearance, hence the mods people need to do. Should be hopefully mounted tonight. I spent money on a new FPR that is slightly more compact than my Turbosmart FPR1200. The gauge has also been moved to the rail. There's also apparently an ORB to AN Union instead of the adapter, because the ~25mm of the current adapter is going to make the difference. Provided this all goes together and arrives today, it'll be the totally not stressful attempt to start it.
×
×
  • Create New...