This qestion is for all who wish to respond.

Well perhaps I am just a fool or something, but it occured to me today that my wastegates are not operating correctly. I have Turbonetics Deltagates that are set ay 6 psi each. Now since the first start up I have been recieving around 12 to 15 pounds of boost. For some reason I thought that well 6 pounds of boost on each side would make 12 total at the intake. Well then again I have my boost lines tee together and read out of the same port (which shouldn't matter anyways). Shouldn't I be recieving a max of 6 pounds of boost?? or should I be be recieving what I am recieving, which is 12 pounds.

 

[Modified by El Mago, 4:12 PM 6/23/2002]

 

Twin turbo applications double the flow, not the boost. In other words, if both turbo's produce 6psi of boost and 900 cfm at a given rpm, you still have a total of 6psi of boost but 1800cfm of airflow. The wastegates are similar, you should have only 6psi of boost.

When you say teh Deltagates are set at 6psi each, do you mean they have 6 pound springs? What are you using to control boost, a "dial a boost" air pressure regulator?

My wastegates are tee'd together as well and reference the same manifold port for vacuum/boost. I followed a schematic provided to me by Precision Turbo and HKS.

Does it run well on 12pis of boost, or are you expereincing detonation? I'm thinking I can probably run around 12 psi as well, so I'm kinda curious.

 

i agree with monty that it does not matter how many turbos you have 6 psi from each turbo is only 6 psi
now when you say they open at 6 psi do they start to crack open or are they at full open
next question where are you getting your boost signal from is this on a small port on the intake or are you getting it from the turbo outlet because this will make a difference also

 

Thats what I was figuring about what my boost should be.
I am currently trying to finish burning out my 92 octane gas with bottled booster in it. I can run great by giving it about 3/4 throttle and it hits 12 psi. NOw the funny thing is, earlier I was just using different gas and was able to hit 12 but was able to open it all the way up. It was colder air then though. NOw it detonates. even if I turn the boost retard up to 3 degrees.

My wastegate sensor hose tee at my intake above the carb. The Pressure should be the same at the compressor outlet as the pressure at the inlet hat right??? I checked to make sure they do open using a mighty vac, but I have no way to see how much pressure it took to have it open :( .

I am almost wondering if my wastegates are incapiable of handling the amount CFM I am pushing.

I am going to talk to Turbonetics tomarrow and see if it might be the issue. If so then I will have to move up to a racegate.

 

well twin deltagates should be good to 800 horse
this all depends on the turbo the biggest thing is your turbine wheel and exhaust hausing

is the boost the same, no the turbo will have more psi becasue all intercooler has pressure drop across the core so depends on if you have 1/2 , 1, 2 psi of pressure drop

all wastegates in my experience work better when the are put into the intake

we had a supra one time with a single setup on it had the wastegate vac. line coming off the turbo it would make like 25 psi and keep climbing we tried everything exhaust hausing porting the wastegates new header etc

then we had no clue so we put the wastegate line after the throttle body and all was fixed it started holding 16psi why is this i have no clue but it seems to work on our tt vette and out turbo mustangs

 

I will have to give that a shot. Meanwhile I am going to relocate my Boost guage line to below my carb, so it will read vacume and boost. I am just having one hell of a time getting everything right. Basically just guessing and checking. Today I decided to play with my timing more. It's just not right. Has anyone delt with the MSD BTM with the vacume advance? Currently at Idle I run a 8egrees of advance, then I have 9 degrees of vacume advance, and 24 degrees of mechanical advance. so when I hit boost I should have a total advance of 32 degrees. after 4 pounds of boost it begines to retard 2 degrees per pound. So after 12 degrees I should have 16 degrees total advance.

But it's not working that way. When I check the timing after all that I said above is supposed to be set. I get over 40 degrees advance. I tried by removing the vacume advance line from the distribuor, but then it just pops and hesitates on acceleration. But I do get a nice 32 degrees total advance. I am new at this.. being 21 years old and doing everything my self I feel like I am accomplishing alot. But then again. I spend almost every penny on my car, when I should be looking into investing... But hell whats the point of money if you can't do something you love.

I am getting impacient with all of this. I want to move on to the interior and a paint job. Then all is done.

 

Any boost reading i would but it after the carb or from the carb your wastegates will respond better your boost gauge will work better

 

I just want to comfirm what your saying. So I should try running my wastegates and boost guage from a point below my carb. "somewhere on the intake manifold"?

I was planning on putting my boost guage below it tomarrow, After that I will try placing the wastegates there too.

Also another question? I am trying to burn out the current gas I have, it's on E now, so I am curious if it is very smart to mix racing gas with regular gas? their is probably like only a gallon left in the tank as it is, and I would throw in 5 gallons of 119 gas to finally tune and put an end to my detionation issues.

 

yes put the boost lines below the carb into the intake manifold

as for race gas depends on what you are going to do with the car is this a street car or a race car?

if it is a street car need to have somebody work the tune on pump gas so that way you dont have to mix gas all the time

race just leave straight race gas in it :)

so to answer your question no it will not hurt to mix but instead of it being straight 118 it will be 110 or 108

 

Well after speaking with some guys at a local turbo shop. "Turbo Technics" which they totally remembered me my car and my name... was kinda cool since every time I have totally bitched them out for trying to cheat me. and vowed to never go there again.

Anyways back on subject. they told me to MAKE SURE I am getting a large enough signal to my wastegates. So I tapped into my compressor outlet pipes and ran some 1/4 lines to them. then did the same for my fuel pump pressure sensor. And relocated my boost guage to below the carb.

And the results..

Boost hits 6 pounds now :)

Had alot more fuel pressue under boost, "found a new leak" but fixed it.

not sure if it's a good amount of vacume considering 950 cfm carb and single plain intake, but at idle my vacume sits around 10, but as I begin to up the throttle it goes up to 30 or so, then boost hits,, and it jumps from there to 6 psi of boost.


New issues.
Still got some timing issues!!

Gotta burn out the gas!!

Found my number 1 sparkplug wire to be sparking against the manifold, nice new crack in it. Who knows what other wires are shorting out.

and :( after letting it run for a while trying to burn out the remainder of my gas, I noticed that my oil pressure went down to around 13psi. when I am almost certain it was around 30 psi at idle. but if I just give a little throttle (maybe 1,500rpm) it goese up to 45 or so.

and.... I think I have a loose or borken motor mount now..

so.. if it's not one problem, it's another.