VS L67 New Exhaust v Boost issues

[Cashaz]

Today I got a 2.5" custom made exhaust , 2x 100cpi magnaflows, a balancer pipe and pacemaker headers,..

It sounds pretty good being a supercharger and an awesome setup on the exhaust place behalf, couldn't be happier.

However, when I am on the at the lights 1. when I put my foot down it doesn't pull like it used to with the previous exhaust system which was original/factory, it used to go from 1 - 3.5k and then wind out, now I find it goes 1 - 3.5k but doesnt feel like the boost is there, and if I hold my foot down, it wont rev past 3.5k+

2. I find the VS statesman is overheating alot more, that I believe is simply more heat is produced from the pacemakers.

I know the performance is there and sounds like it, however, what could it mean,
MACE CAI for more air flow?
Check the boost solonoid if they unplugged?
Change the 6psi pulley because it cant keep up?
Could the coupler rattling be an issue in terms of the boost?

I was told I would'nt need a tune untill I had well and truly finished, and I find it was alot better running standard.

Is it as simple as just driving smooth for the next few weeks and letting the computer tune itself?

Suggestions?

Cheers,
Andy

[Cashaz]

bump. suggestions anyone?

[wana s' charge stock vt]

if its not reving past 3500rpm with foot flat theres problems.

when i went from a stock l67 exhaust to twin 2.5' i noticed that it lost a bit of bottom end power(wasnt as responsive when first floored it) but when the revs picked up(2500-3000rpm+) there was a noticable gain in top end power and reved out better and smoother than ever befor..

ya sure they havent disconnected the bypass accurator hoses or reconnected it wrong or something? or o2 sensors mayb... but somethings up the shit for it not to rev past 3500rpm.


mine was only 6psi then too and was fine with twin 2.5'
, coupler wouldnt cause any prob's apart from niose
, shouldnt need a tune for an exhaust upgrade.(i didnt n never herd of anyone else)
ecu shouldnt take long to adjust if it has to adjust at all.

[wana s' charge stock vt]

do ya know what way the hoses go on the boost bypass acurator ????



edit- (from reading your post's/plan's).... your cars guna be a weapon in no time, lucky bugger. wish i had a few grand to blow

[Cashaz]

I'll give it another go today, I can work it out but when I was watching the guys they didnt touch the boost or bypass unless when they took the headers out, they unplugged something.

Ill give it a hit today, but I hope its not up the shit, but feels like it doesnt wanna go, I can feel the power. And I have seen pics but I doubt they touched it but there is a possibility.

I need to maybe check out the why the computer is not recognising.

[wana s' charge stock vt]

they could have knocked it off when changing the headers, its pretty close to one part of it.. its bolted onto the back end of the passenger side head....

when ya give it quick revs it in nutral ya should be able to see the bypass shutting and opening. should see the stopper part hitting on the screw with quick revs.

good excuse to get a boost gauge

[Cashaz]

they could have knocked it off when changing the headers, its pretty close to one part of it.. its bolted onto the back end of the passenger side head....

when ya give it quick revs it in nutral ya should be able to see the bypass shutting and opening. should see the stopper part hitting on the screw with quick revs.

good excuse to get a boost gauge

Ill have a look, would'nt mind a diagram or pic or even a vid to see exactly what it is meant to do :S

also, do your belt screech untill ur car is warmed up?

[wana s' charge stock vt]

na belt dont screech. even with 10psi pulley and standard belt it dont slip. could be the other belt slipping too thou.

will try n find a pic, someone posted one in one of my threads once. but its gone.

[wana s' charge stock vt]

just did a vid of what it dose instead . YouTube - Video from My Phone

when idling the little shaft/pin thing should be sucked up inside the accurator (big black pod with hoses attached) then when rev it the shaft should push down and the tab should hit the stopper screw.

[Cashaz]

just did a vid instead of what it dose. YouTube - Video from My Phone

when idling the little shaft/pin thing should be sucked up inside the accurator (big black pod with hoses attached) then when rev it the shaft should push down and the tab should hit the stopper screw.

oh awesome, and sounds hot! nice work.


Thanks man Rep +1 to you, ill give it a look.

[wana s' charge stock vt]

no worry's. hopefully it the problem ... dunno what else it could be,seems a bit wierd ... nothing really has to be touched to do headers or exhaust..... unless they damaged o2 sensors(but should get engine light coming up) or stuffed a spark plug lead, or mayb put ya maf on backwards or something simple.(maf's got an arrow pointing the way it should be)

[Cashaz]

no worry's. hopefully it the problem ... dunno what else it could be,seems a bit wierd ... nothing really has to be touched to do headers or exhaust..... unless they damaged o2 sensors(but should get engine light coming up) or stuffed a spark plug lead, or mayb put ya maf on backwards or something simple.(maf's got an arrow pointing the way it should be)

now you mention it, it could be the spark plugs because as I rev SOMETIMES it kicks back a bit, like knocking in the exhaust in a way.

[wana s' charge stock vt]

never know, could be. i hate leads. such pain in the ass,touch em to much and they break/start missing. i'm on my 4th set in 8 months lol. supercheap leads are gay, and so are top gun. i ended up going genuine holden l67 ones $98 from holden, and there ment to be the most reliable........ if ya get new ones i'd say definatly stay away from all bosch(from supercheap) and topgun leads... from what i've read- go big msd leads or genuine leads, but most people say genuine are the go...

[Cashaz]

never know, could be. i hate leads. such pain in the ass,touch em to much and they break/start missing. i'm on my 4th set in 8 months lol. supercheap leads are gay, and so are top gun. i ended up going genuine holden l67 ones $98 from holden, and there ment to be the most reliable........ if ya get new ones i'd say definatly stay away from all bosch(from supercheap) and topgun leads... from what i've read- go big msd leads or genuine leads, but most people say genuine are the go...

Yeah mate, im pissed there is no actual mechanics that know anything abt s/c, everyone knows about 4s,6s and 8s and most mechanics are knowing more about turbo's, but there is no mechanic I can take my car to that is decent and knows what they're doing and say "ok find all my problems, fix it" I cant be bothered diagnosing every problem if its the boost actuator, bypass, spark plugs, low s/c oil anything.

Lol deciding get out of a computer networking engineering career and become a performance mechanic with s/c, anyways, need to find a few or else I'll just get myself an 8.

The screeching, under performance after putting an exhaust on, coupler issues... it gets too much, IMO.

Thanks though for the advice.

[Klint_VS]

coil pack maybe?
happened to a mates vs

[wana s' charge stock vt]

Yeah mate, im pissed there is no actual mechanics that know anything abt s/c, everyone knows about 4s,6s and 8s and most mechanics are knowing more about turbo's, but there is no mechanic I can take my car to that is decent and knows what they're doing and say "ok find all my problems, fix it" I cant be bothered diagnosing every problem if its the boost actuator, bypass, spark plugs, low s/c oil anything.

Lol deciding get out of a computer networking engineering career and become a performance mechanic with s/c, anyways, need to find a few or else I'll just get myself an 8.

The screeching, under performance after putting an exhaust on, coupler issues... it gets too much, IMO.

Thanks though for the advice.

drop it off at holden if you dont want to do it. pretty sure they'd know how to do everything.

[Cashaz]

drop it off at holden if you dont want to do it. pretty sure they'd know how to do everything.

Its an option, but I would rather just gather research here and work with it during the early morning when I have time, as such.