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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#21
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Before purchasing parts, check with the mfg to make sure they are not end of life. I don't believe the Godzilla BOV is still being produced. This statement is based on it not being available from turbonetics according to their web site.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#22
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Thanks Tom.... So if you have a Supercharged engine, where you have a certain supercharger that is producing say 15 lbs of boost on a 400 Pontiac, and you build a 455 Pontiac with the exact parts, you would have to drive the supercharger faster with either a bigger crank pulley or a smaller supercharger pulley to produce the same 15 lbs of boost, do to the bigger Cu. In.
A turbo setup with say a 15 psi spring in the gate, would produce the same 15 psi, be it on the 400 or the 455 without changing anything, correct? In other words, Engine size doesn't matter with a turbo setup that is using a wastegate that is calibrated with a preset spring pressure, it will always produce the same amount of boost as the spring in the gate is good for, no matter the engine size, correct?
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1978 Trans Am Pump Gas 461 Stroker |
#23
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I went to this link that says 2016 to 2018 hardware and the Godzilla BOV is listed. http://www.turboneticsinc.com/perfor...cts/wastegates They list the BOV in the Wastegate section of the catalog. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#24
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A wastegate attached to the Intake manifold CONTROLS the pressure in the intake and will raise to a given amount before it starts to release exhaust volume and maintain the given requested boost pressure. The boost pressure can be further controlled with a PWM (Pulse Width Modulated) control that allows the computer to have multiple Boost Pressure values based on a performance curve that you want. You can use a given spring and by tricking the signal have the valve open at a higher pressure vs the spring pressure without the control system. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#25
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It shows up here, but you can't add it to your cart to purchase. http://www.turboneticsinc.com/perfor...f/godzilla-bov A part number search for Model: Godzilla Part Number: 10765 doesn't return results. This specific BOV is still available from other sources. I was considering adding a 3rd BOV on the intercooler.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#26
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That 3rd BOV might be a good idea, I have some pictures from the Turbo Forums of a Water to Air Intercooler (passenger side installation) that it blew out the side of the inter-cooler panel. I believe that you have a Burst Panel in your Raven Intake from Mark, correct?
The third BOV might save the inter-cooler. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#27
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Quote:
https://switzerdynamics.com/products/burst-panel
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#28
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Do you think 2.25" crossover pipe off of each bank, merged into the divided T6 flange would work good for me? I haven't decided 100% if I will use factory cast log manifolds that exit in the stock location and just run the pipe forward under where the A-arm and subframe meet(like 70bird did), or use a set of turbo headers. Tribal Tubes said he would build me a set for $810 Shipped with VBands, uncoated($730+$80 shipping). They are 1.75" primary and my choice of 2 1/2 or 3" collector. 16g Mild Steel with 3/8" flanges. Obviously, using the manifolds would save quite a bit of money, as where the turbo headers would probably provide more clearance for routing the Downpipe back under the car, so I am undecided at this point on that decision. For the downpipe, I'm thinking of trying to do 5" out of the turbine as far as I can, reduce it down to 4", and then split it back into my dual 3" exhaust with Dr Gas xpipe, Ultra Flow mufflers and 3" tailpipes.
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1978 Trans Am Pump Gas 461 Stroker |
#29
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Do a 2.5" collector and 2.5" crossover. This way u don't need to upgrade in the future. Make sure u have a good wastegate placement. Good luck.
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#30
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The pipe only needs to be 3 times the turbo discharge opening for the length. Then you can reduce the pipe in sections to get to your split to the 3" pipes. If the pipes are too large you get a slow gas speed thru the exhaust system. Make the system just big enough to handle the exhaust gas flow. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#31
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1978 Trans Am Pump Gas 461 Stroker Last edited by TransAm 474; 03-10-2019 at 07:10 PM. |
#32
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I found this nice looking flange for the T6 turbine inlet.... Its available in either 2.25" or 2.50", and you can buy them in "butt weld" or "slip fit" versions.
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1978 Trans Am Pump Gas 461 Stroker |
#33
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And the length can be 10.5 to 12" long for the 4.5" diameter piece. Then you can neck it down to a 4" pipe and another 10" or so you can go to the 3.5" pipe. The exhaust gasses will have cooled over that length and be more dense and will still flow properly thru the 3.5" pipe at that point. So you really do not need 4.5" pipe all the way to the firewall area. Just makes things harder to work on. Just after the 3.5" pipe transition is a good place to put your EGO Sensor to read the Air/Fuel Ratio on a "Street Car". Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. Last edited by Tom Vaught; 03-10-2019 at 08:31 PM. |
#34
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
#35
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Here is a link to a build thread I did 12 years ago .... http://www.pontiaczone.com/forum/sho...ght=s400+build
On a side note, I just finished installing my s488 today I started it with no leaks. I could not test drive it because the weather still sucks here. |
#36
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1978 Trans Am Pump Gas 461 Stroker |
#37
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I went with the sx https://www.ebay.com/itm/Borgwarner-...0AAOSwDNdViwhh
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#38
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Quote:
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1978 Trans Am Pump Gas 461 Stroker |
#39
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Ok, if I want to do the crossover in 2 1/4", and keep it a true divided system all the way into the turbo, then I will likely have to run 2 wastegates, one in each pipe, correct?
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1978 Trans Am Pump Gas 461 Stroker |
#40
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If you have a smaller dual turbocharger set-up then you can run a small wastegate for each bank because the mass flow thru the engine is divided in half.
In your case you have a large turbocharger and probably a 455 cid sized engine so the exhaust mass flow for the engine is going to one turbocharger. With the divided inlet for the Turbine and two waste-gates the engine thinks it is two 4 cylinder engines. If you can find a Large Waste-Gate for the installation (Precision Turbo Wastegate) https://www.maperformance.com/produc...waAjZDEALw_wcB You MIGHT be able to bleed off enough exhaust volume on the engine to keep the Turbo in the 10 psi boost range. A lot of variables here. 10 psi says you are not working the turbo very hard and the leakage across the turbine wheel and the compressor wheel might get you a lower boost level than you think. But as I have said in the past, if you get a bit boost greedy then you want to flat line the pressure ratio across the compressor map and that means the waste gates have to have the ability to keep the boost line flat at that point. Otherwise you have boost creep. The Waste gate works fine, at lower engine speeds, and then IT/They lose control of the boost at higher speeds. Two properly sized waste gates give you a lot of insurance on that not happening. CHEAP INSURANCE vs a Wounded Engine I personally do not think the 10 psi Boost number is going to last long. The higher the boost level the less the wastegate size needs to be because more of the exhaust volume is going to drive the Turbine Wheel. You can even add a PWM controller to "TRICK' the wastegate into delaying the amount of exhaust volume bled off from driving the Turbine Wheel. A 1.32 A/R turbine housing is going to delay the early boost point too, vs a smaller housing. Smaller = earlier boost. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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