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81017, Why the hell is the silvia over boosting?
Posted by Blizare, Jan-03-05 07:15 PM

All we did was change the plugs from shitty bosch platinums to NGK's gapped to .50

We then took her out for a pull and was fine. Next day car was running fine boostin 10-11 (normal) then tonight i got on it and it hit 14-15 psi!! and started to sputter asnd miss like I've nevar heard.

wtf?

so back to the shop to lower the gap..... we go .44 and take her out.

Same thing.

what the hell causes overboosting like that?

all of a sudden?

81018, RE: Why the hell is the silvia over boosting?
Posted by Blizare, Jan-03-05 07:21 PM

OKay I searched and I KNOW that the boost gauge line is right off the intake mani. (good signal)

everything else, (wastegate lines n shit) is stock.

Everything from the hot side of the turbo is 3" but that bumped the boost from 8-10/11 psi......so 15 is outta the question.

wtf?

81019, RE: Why the hell is the silvia over boosting?
Posted by 420a-Tnthewerks, Jan-03-05 07:51 PM

the creeping can probably be solved by porting the o2 housing hole and wastegate hole.

edit - isn't there a silvia board he can sign up at :P

81020, RE: Why the hell is the silvia over boosting?
Posted by SILVERNT, Jan-03-05 08:17 PM

how is the vacuum line for the wastegate actuator?

81027, RE: Why the hell is the silvia over boosting?
Posted by Blizare, Jan-04-05 03:42 AM

Originally posted by SILVERNT
how is the vacuum line for the wastegate actuator?

perfectly fine!!!!

BTW: i am 0n nissansilvia.com but theyr'e a bunch of choads over there down under..

81036, RE: Why the hell is the silvia over boosting?
Posted by micyek, Jan-04-05 08:05 AM

micght be a coincidense that this happened right after you worked on it...but make triple sure you didn't knock anything out of wack when changing the plugs.

81041, RE: Why the hell is the silvia over boosting?
Posted by Blizare, Jan-04-05 10:22 AM

Originally posted by micyek
micght be a coincidense that this happened right after you worked on it...but make triple sure you didn't knock anything out of wack when changing the plugs.

Well, that kinda what I thought. But there is nothing loose.

I'm gonna check again tonight when we get to the shop later, but :shrug

It HAS to be something to do with the wastegate though doesn't it?

81054, RE: Why the hell is the silvia over boosting?
Posted by JWoodley, Jan-04-05 02:01 PM

Thats a pretty large gap for that boost level. Maybe you should gap them smaller and possibly adjust the mbc. Speaking of which, what MBC are you using? Could be the problem....

81055, RE: Why the hell is the silvia over boosting?
Posted by eclipse982nrRST, Jan-04-05 02:21 PM

Originally posted by JWoodley
Thats a pretty large gap for that boost level. Maybe you should gap them smaller and possibly adjust the mbc. Speaking of which, what MBC are you using? Could be the problem....

my turboxs MBC spikes 2-3psi sometimes, just cuz its junk. if he has a junky MBC, could be that.

81063, RE: Why the hell is the silvia over boosting?
Posted by Blizare, Jan-04-05 06:47 PM

no MBC.

Supposedly, factory boost is 8-9 psi.

We're seeing 10-11 but we figured it was the cold ass 20*F temps.

81064, RE: Why the hell is the silvia over boosting?
Posted by 420a-Tnthewerks, Jan-04-05 07:00 PM

Originally posted by Blizare
no MBC. Supposedly, factory boost is 8-9 psi. We're seeing 10-11 but we figured it was the cold ass 20*F temps.

yeah, get a bc first..

81067, RE: Why the hell is the silvia over boosting?
Posted by babybeclipse, Jan-05-05 06:38 AM

damn it! I keep ready "Guess who's boobies are on my Aviator"