6psi. stock boost???

[last_in_line]

ok i had a manual boost controller installed on my 94 dodge stealth twin turbo but i think it was slowly inching up to higher and higher boosts i had it set to 14psi. so i decided to remove it until i can afford a electronic one, anyways when i took the boost controller off and left my boost gage on i was surprised to see that my stock boost is friken 6psi i was shocked i had always heard 12 was stock. anyways if anyone has any info on this id appreciate it. also its a california stealth which i wouldnt doubt it if only cal. has 6psi stock boost:mad:

[detpac]

Can you post a list of your mods? Just curious about that boost. Any mods you have done.

[last_in_line]

gutted precats atr down pipe walbro fuel pump fuel pump hotwire high flow cat. greddy bov gt ypipe stillen air filter

[detpac]

Only 6 psi? What are you checking the pressure with? Which boost guage?

[last_in_line]

VDO -30-0-25 PSI Boost Gauge i got it from extreme motorsports

[92StealthTT]

Did you hook the wastegate solenoid back up? If everything is hooked up right & you're only getting 6psi, you probably have a crapped out solenoid. The wastegates are set to open ~6psi, so in other words your solenoid probably ain't doin' jack.

Mine was doing the same thing, it was only getting 6 psi instead of the 9. So that's when I put on the MBC & it fixed all by bypassing the solenoid. Either put the MBC back on & set it at 12 or whatever, or live with 6 until you get the EBC, or spend the $50-$60 for a new solenoid.

[The Lurker]

could it be a boost leak?

[last_in_line]

hmm im not sure i did not instal the mbc myself i hired someone to do it. but my nephew has a 3000gt and i copied how his tubes were hooked up. i dont know if its a leak or not but the boost goes to 6 every single time. and stays there all the way to high rpms. where can i buy a stock solenoid for 60 bucks at? the reason i took the mbc off is cause i heard they can go over the pressure that you want them to. also it kept creeping up to higher boosts.

[last_in_line]

are the ebc's really safer?

[detpac]

You will have a slight creep of about 1psi on most boost controllers. This is called spike. But most of the time you will be in the safe range. If you hook it up again, set it to about 11psi. You should not have any problems. Then, If you are going to race and want to still be safe, set it lower.

For a solenoid, run a search on 3SI's forum, that might be a good place to start. Also, call Mitsu dealer to find out what their price is and you can get an estimate of what you do not want to pay over.

[last_in_line]

so stock boost for a 94 stealth twin turbo should be about 9psi then if the solenoid is working properly? also sinse i hotwired the fuel pump i get this whining sound coming from the pump i guess and its pretty loud and kind of annoying. is this normal. before i hotwired the pump it was cutting out at high boost mostly in first gear

[The Lurker]

I heard 91 -93 have 9.5 lbs stock and 94 and up have 11.5

[detpac]

"I think something is screwy with either the unit itself! This is after setting it with manual settings that were on Jeff W's car as well! I understand that I am only getting 5-6 psi because the stock boost solenoid has been disconnected but it's as if the boost controller isn't there at all!"

"I had the same reaction when I did mine until the old veterans pointed out that 5-6 psi is normal for the system once you've bypassed the factory boost controller (I was expecting to see a factory value for a 2nd gen. car of somewhere around 10-12 psi)."

I just found this. Apparently, if the stock boost solenoid is disconected, you will only get 5-6 psi of boost. Since you had a MBC in place, you had bypassed the stock solenoid. when you unhooked the MBC, the stock boos solenoid is still bypassed giving only 5 - 6 psi. You need to check the hoses and all the connections. You will probably find one left off.

[The Lurker]

Nice work Detpac!! I am impressed you are a walking search button!:p

[detpac]

What can I say. All those years of studing and research paid off. When is it that I will not have to research. I thought it would end after school. It just got harder.

[The Lurker]

See and now you do it for fun:D

[last_in_line]

i compared my stock solenoid with my nephews 3000gt and everything seems identical all the connections are good from what i can tell. :( i did notice that when i was taking the mbc off the guy who installed it did not cap it off i wonder if its just collected dust or something over time. thanks detpac and lurker youve been a lot of help

[last_in_line]

i just instaled the mbc again and its still at 6psi:sadman: but i have a question when the serviceman installed it for me originally he had the y pipe capped off. is it supposed to be that way?? maybe i do have a friken leak

[detpac]

Y pipe is not supposed to be capped off.

[last_in_line]

the little nipple on the elbow of the ypipe should still be connected to the 4 connecter thingy then?

[detpac]

Yes.

[The Lurker]

I don't know if your aware but there is a diagram under your hood of all the little vacuum lines. You might want to check those as well

[detpac]

Did it work out? What happened?

[detpac]

Here is a link for a diagram of the Vaccum hoses.

www.stealth316.com/2-vacuumhoses.htm

Double check yours

[last_in_line]

yep every hose is where it should be as far as i can tell i compared with the diagram that you gave me. so something is screwy. ive also gone through and changed all the small vacuum hoses that connect the solenoids that are in the back hoping maybe that would clear up any leak problems i used silicone hoses. i think im going to take it in to the garage that installed the mbc in the first place. ill let you guys know what happens.

[detpac]

Hope it is minimal. They probably unhooked your solenoid. or it broke.