Garage Storage Organization and Garage Cabinets

bm_zimmer · **car still wont boost over 7 psi....**

hey, ive been working on my car for about 3 weeks now trying to get it to boost over 7 psi and i just need to see if anyone can give me a few key pointers on what to look for. i own a 88 shelby z. i have reworked the vaccum lines in it 3 times. everything is brand new. i ve used silicon on every hose connection aswell. i have changed plugs, wires, a coil pack(msd blaster2), checked for cracks on all intercooler hoses. before i siliconed everything i was getting 10 psi peak boost and then 4-5 steady. now im getting 7 psi consistently. i was told that stock t2 daytonas usually got 11-12 psi. is there anything else i can check before i spend the money to get a cal and all that is required for 1. i just want to get the car running stock again before i start dumping alot of money into something thats not even running 100%. thanks for all the input.

brian z

**jim34** · 08-29-2007, 11:22 AM

First check your wastegate flapper to see if it is moving freely and make sure that it is connected to the arm on the can. The clip on the arm tends to rust out and then the arm pops off.
The arm should spring back towards the can also.
The vacuum line going to the can should be going to a solenoid on the passenger side of the car and there should also be a factory installed restrictor in this line.

bm_zimmer · 08-29-2007, 08:32 PM

i found a nipple on the turbo itself near the intercooler hose... should that be plugged or should it be open to the atmosphere???

89ShelbyGuy · 08-29-2007, 08:42 PM

lol....NO!!!! That nipple is used for vaccum..you have to plug it up!!!! thats why your only boosting 7!!!

bm_zimmer · 08-29-2007, 08:56 PM

ahahahaha i thought so lol! thanks guys for the help. ive been raking my brain for weeks before i posted this. now hopefully i canget 14- 15 psi out of her! sweet im going boosting tonite!!! lol

oh and by the way: driving a honda is like banging a fat chick...your gonna do it but your not gonna tell your friends about it!!!

bm_zimmer · 08-30-2007, 09:53 PM

well i plugged up the nipple on the turbooost. and i now get 9 psi of boost. why is that??? i rechecked my intercooler hosing and i found no cracks or breaks again. do i have to have to have the solenoid hooked up to get the g-valve to work??? from what i have read you just do away with it. oh and i disconnected the wastegate(vaccum) and i hit overboost at around 15-16 psi.im thinking imaybe i might have a bad g-valve or something along them lines. my compression ratio is anywheres around 130-139 across the board. i dont know maybe someone else might have an idea.
thanks for your time,
brian

DaytonaTurboZ · 08-30-2007, 10:10 PM

Do away with the solenoid, and if you unhook the line and your getting 15+ psi then your problem lies with your g-valve. Its either not installed correctly or you need to adjust it. There's a detailed page somewhere online to read.

**jim34** · 08-30-2007, 11:32 PM

Try and see if you can get the solenoid to work all you need is manifold vac, I get mine from the fuel pressure regulator hose to one port of the boost solenoid then the other line strait to the wastegate can and if you put a nice .030 restrictor in the line like a welding tip or the stock restrictor (looks like a vac line connector) it will help spool the turbo quicker.

TurboTurismo · 08-30-2007, 11:43 PM

I had my factory red restrictor out and couldn't remember which way it installed..err the one end is open and the other has a small screen? Do you what end goes towards wastegate? 89 T1 2.5

Thanks http://www.cardomain.com/ride/2291434
Robb

**jim34** · 08-30-2007, 11:55 PM

I dont think it matters as long as it slows down the pressure going to the wastegate can. I know factory has a bunch of different colored restrictors cause I have about 4 of them in my collection never really measured them but im pretty sure they are different sizes also

TurboTurismo · 08-31-2007, 12:11 AM

I have a turbosmart boost controller.. but if I try and go past 10 psi the boost goes upto 14 then drops to 10 then rises to 13 then drops back and forth..at the same time I can hear the engine rev up and down at the exact same time... a/f gauge indicates rich all the way thru, this is all at wot..oh yeah..this seems to happen more after the auto tranny shifts into third ......sorry to hijack the thread......boost controller hooked to brake booster then to wastegate..factory solenoid still wired but no vacuum to it......any ideas...thanks in advance for any help.....factory plastic bov leaking? The Turismo is intercooled t2 rad and i/c with 89 t1 mitsu and auto all from a 89 mini..

Robb http://www.cardomain.com/ride/2291434

**jim34** · 08-31-2007, 12:42 AM

You could try different size restrictors in the line to try and better match it with your boost control set up you might need more flow to the controller, try taking the restrictor out and see how it does

TurboTurismo · 08-31-2007, 12:51 AM

OK cool, I had the same issues without the restrictor in aswell..just too longer to get the spool.. Thanks for the help...

Robb http://www.cardomain.com/ride/2291434

omnivore · 08-31-2007, 01:03 AM

Pluggig that nipple on the compressor housing won't get you another 7 psi,LOL. In fact I unknowingly drove my Omni for 2 yrs with that baby wide open, and was running 14 - 17 psi with just a fish valve bleed, later swapped for a grainger

bm_zimmer · 09-02-2007, 08:10 PM

well thanks eveyone for the help. i figured it out. the spring on the g-valve needed to be stretched. i ve got it boosting at 15 psi with no overboost cutout. and now it is time to go take on the unsuspecting in my area. thanks again.

brian