Silvia Club of NSW
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s15 problem ..
https://forum.silviansw.com/viewtopic.php?f=3&t=33330		 Page 1 of 1
Author:  SPC99R [ Thu May 21, 2009 10:42 pm ]
Post subject:  s15 problem ..
hey guys, i noticed that my car struggles to pull from 3rd gear up at full throttle. it will hit full boost at about 4k but doesnt seem to pull at all, while on 3/4 throttle full boost will come on about 3.2ish k and pull nicely.

1st and 2nd are fine. vacuum on idle is about 4ish and abit on stock gauge.
also when full boost is on the needle is jumpy, like it doesnt stay on 0.6 bar, it will move from 0.6 to 0.65 then back down then back up.

i know i should take it to a mechanic but i dont have time as i work 6days a week.
Author:  SPC99R [ Thu May 21, 2009 10:51 pm ]
Post subject: 
forgot to mention car is fully stock bar airfilter
Author:  SPC99R [ Tue Jun 02, 2009 8:04 pm ]
Post subject: 
took it for another drive thrashing through 1st 2nd and 3rd

when i put my foot down, by the time it reaches 3k its at 0.5 bar then continues to rise to about 0.7 - 0.8 by 5k

problem is it doesnt actually start pulling till im over 4k

is this normal.

any help would be appreciated.
Author:  shootME [ Mon Jun 15, 2009 2:55 am ]
Post subject: 
Hey mate

I have the same problem except I'm not getting the push I used to get in 1st and 2nd.

Yea so does anyone have an idea??
Author:  Serial Killa [ Mon Jun 15, 2009 9:09 am ]
Post subject: 
Could be a leak around the turbo area

Does it make any abnormal noises when it hits boost?
Author:  shootME [ Mon Jun 15, 2009 4:51 pm ]
Post subject: 
For me everything seems fine just no power.

Having it dynoed this Sat to see whats the problem.

Let you guys know when I find out
Author:  cypher1024 [ Mon Jun 15, 2009 11:08 pm ]
Post subject:  Re: s15 problem ..
SPC99R: It sounds like it might be an air leak. Check all of your intercooler piping for leaks.

shootME wrote:
For me everything seems fine just no power.

Putting it on the dyno is a great idea. Chances are you're just used to the power, so it doesn't seem fast any more. You're always chasing the dragon when it comes to your car feeling fast. No matter how much power you make, eventually you'll get used to it.

The best (and cheapest) remedy is to drive a much slower car around for a week or two. Then when you jump back in your Silvia, it feels fast again!
Author:  SPC99R [ Thu Jun 18, 2009 8:04 pm ]
Post subject: 
found a leak on the left side, slightly drives better now it will pull from 2k on but isnt that strong but enough to notice a difference.

boost gauge still reading abit above -4 on stock guage so im guessing theres still a leak somewhere, just gotta find it.
Author:  shootME [ Sat Jun 20, 2009 9:29 pm ]
Post subject: 
hey

So what leak are you refering to? in the intake section or the small pressure hoses around that activate the actuator?

Are you making positive boost around the 2.5k rpm mark? if not then you may have a leak in those small hoses that goes to the actuator.

Also a small update I had it dynoed today and mechanic said it was making power but was running a bit rich
Author:  SPC99R [ Sat Jun 20, 2009 10:21 pm ]
Post subject: 
sorry when i said left side i meant standing infront of the car.

found the leak, on the driver side. actually it popped off while driving. where the t piece is, that smaller tube that goes to the thing on the tower, guess it wasnt connected properly.

i will make like 0.2 bar at 2.5k i think.
Author:  shootME [ Sun Jun 21, 2009 6:49 pm ]
Post subject: 
Yea I had the same problem before. but my hose was cracked instead.

Glad that you are making boost.
Author:  SPC99R [ Mon Jun 22, 2009 8:01 am ]
Post subject: 
i bypassed the stock solenoid, connected a new pipe straight to the wastegate.

it only boosted 0.4 all gears, the stock wastegate spring is 0.5?

its prob intercooler piping, or something.
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