so i was taking my friend home today, and he was saying how it was slow and a rice burner. so i did a 40 for him. i have a k&n drop in and the ARK GRIP exhaust. started in 2nd, powershifted into 3rd, looked at the boost gauge and it spiked at 15 and held about 12.5. YES I SAW CORRECT! just got the exhaust on and before was hitting 10 only. so whats up with this?

btw is 06 ss

 

Is your exhaust MORE restrictive than stock?

 

12.5 is stock boost. If it is spiking 15, you may have a faulty gauge or a clogged cat. Our cars do not have a "spike" in boost like turbo cars.

 

hmm. well i believe you about not spiking i didnt either but it did today, and also today was the first time for 12.5. have always been at 10 before.

 

check your cat out, make sure it isn't clogged.

 

just got it put on monday so it better not be haha

 

or the gauge is FINE and ur boost stacking... watch out for that bad business

 

boost stacking? sounds like a good thing ha

 

go read up about it. i bet u take that ha right back lol

 

I have a stock car with no exhaust just an intake and I hit 12.5 all the time in the high rpms

 

well today was my first day hitting 12.5 so im trying to figure out whats wrong


boost stacking, basically bringing in more air than you can put out? that right?

 

All you COULD be doing is cycling that heat around and around in the blower. which could POSSIBLY make you blow a piston. did it CREEP to 15 PSI or did it jump right up? and im just saying you could POSSIBLY be boost stacking which is RARE as hell on M62's. you see it more on M90's.

 

im pretty sure it jumped up... but i'm not sure i know it creeped back down to 12.5 just like spiking a turboed car. im gonna go do another 40 to try and figure this out. be back shortly, will try for video

 

if you can do a vid. TRY but if u cant its ok. 2nd and 3rd gear. and get the tach also with the gauge. or just do both separate vids.

 

well this time it held at 12. idk. tried 3 different times and none spiked or anything they all held right at 12. weird.

 

okay dumb question but are you sure you just never really watched your boost gauge when wot until just now? the difference from 10 to 12.5 when glancing you wont notice unless your staring at it haha

 

yea im almost positive when i first got it i was only at ten...could be wrong but i mean still i know for a fact it spiked 15 somehow bc i was like HOLY ****!!

 

here i was over at the 3800pro.com forum and posted a thread regarding this. but since u didnt do it again when u just went out. maybe it was just a idk... car is maybe asking you to do a stage 2. like the pcm told the boost gauge to say like i wanna be HERE at WOT come on!?! lol but here is the reply i got...

Boost stacking can happen when your intake side out flows your exhaust side, or you have too much intake side restriction. The Eaton roots style blower "blows" air into the intake manifold, not really compressing it in itself, this causes pressure in the intake manifold, poor flow in the intake can cause the boost to build and, especially with this type of supercharger, it makes a LOT of heat. This pressure isn't your cylinder pressure, its unusable pressure in your manifold which does nothing but drastically increase the temperature of already heated air, which isn't exactly good for performance, or even running for that matter. Posted by: 98Park

from reading that reply from the 3800 forum and ur mods. maybe since u have a "full exhaust" basically 2.50 all the way. maybe its time for air box mod/ cai. which ever. i did a air box mod. love it

 

haha yea i'm working on the stage 2 man but im only 16 and work at outback so income is slowly coming in ha. i'm hoping after christmas ill have enough cash. but i do have the airbox mod with a k&n drop in.

 

mine "spikes" on a NLS as well. Though it was just from the extra RPM

 

K&N drop in as in a cone shaped filter as u would see on a cai with the bottom of the air box cut off?

 

yea the cone shaped filter but i left the bottom on...i know sme people do take the bottom off but i thought it was bad to have the unfilterd air just being sucked in

 

your 16.. my opinion would be to save up for the intake first, becuase if your gonna go stage 2 ( im assuming gms2), your gonna want the intake for better flow anyways. Im 19 full time student and 30 hour a week worker.. i know how the money thing is... therefore that would be my choice. get an injen or w.e your preference is. Worry about the stage kit when you have money to fix something if something were to go wrong.. always remember the what ifs on these cars

 

Leaving the bottom off is the same as having a cai. A cai doesn't have a box on it. It'll be fine take the lid off the box and let that m62 scream.

 

ok yea guess you are right about the CAI not having a bottom. will take that off tomorrow.
i'm just glad to see my car isn't doing anything weird right now.