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post #41 of 67 Old May 19th, 2018, 02:52 PM
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6 psi is too much. You are suppose to run a 2 pound spring when using the Tial with a supercharger.
http://tialsport.com/documents/w3_tial_qqr_sp.pdf

Looking at the chart it appears that the 2 pound spring is 3 pounds when used in the Tial 50. The spring does not hold the BOV closed. It starts the BOV to close. Boost (through the vacuum line) actually holds the butterfly valve in the BOV closed. One pound is roughly equivalent to 2 in.hg. of vacuum. A 3 pound spring will start the BOV to close at around 5-6 in.hg. A 2 pound spring start it to close around 3-4 in.hg. Once closed it cannot open until you let off the throttle and the engine goes back to vacuum.

I wouldn't think a 6 pound spring would cause surging. I think it would the the opposite. It would keep the BOV from closing when it was suppose to. Not opening all the way causes surging.

I had surging once. I thought I needed a new BOV. I was convinced the diaphragm inside of it was leaking. I was talking to tech support when I discovered the adjustment lock nut was missing. That not only cause leaking vacuum but it also made it impossible for the butterfly valve to open all the way. I replaced the lock nuts and adjusted the BOV so that it would fully open. I have driven it 8 years after the repair with no problems.

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post #42 of 67 Old May 19th, 2018, 02:53 PM
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Anyone on here experienced with bov's? I'm running a Tial 50mm and I believe I'm getting surge. Is this bad? How can I fix it? I believe I'm running a 6psi spring. Should I switch it?
My Tail come with a 2lb spring for S/C applications. My tuner even weakened it a bit more to get it to perform correctly with my set-up. 6lb seems high.
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post #43 of 67 Old May 19th, 2018, 11:51 PM Thread Starter
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What bov do you have?

---------- Post added at 08:45 PM ---------- Previous post was at 08:44 PM ----------

What exactly did he do?

---------- Post added at 08:51 PM ---------- Previous post was at 08:45 PM ----------

I just purchased a 2psi green spring. Let's see how I like it. I will give you guys my feedback.

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #44 of 67 Old May 20th, 2018, 12:06 AM
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I have the open bullet procharger BOV on my car. I like it a lot.

Matthew 26:52-54 / Go Pack Go!

2001 GT Convertible - D1SC / Cammed / Geared / 440wh 400wt

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post #45 of 67 Old May 20th, 2018, 01:15 AM
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2002 gt
D1sc 3.4 pulley with stock crank pulley. Build motor, TKO600 trans
605/535

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post #46 of 67 Old May 20th, 2018, 09:13 AM
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Originally Posted by mustang562 View Post
What bov do you have?

---------- Post added at 08:45 PM ---------- Previous post was at 08:44 PM ----------

What exactly did he do?

---------- Post added at 08:51 PM ---------- Previous post was at 08:45 PM ----------

I just purchased a 2psi green spring. Let's see how I like it. I will give you guys my feedback.
I have the Tail 50mm with 2lb spring. Idk how he weakened it but he said he had to for my set-up. I’m only running 6-7lbs of boost.
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post #47 of 67 Old May 20th, 2018, 09:27 AM
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That will be a very fun car. Will you be running your meth kit as well? If not, do you want to sell it?
It's still on the car, but I haven't sprayed it yet. So far, the IATs have stayed low enough that I'm not sure if I will or not. I don't think I'm going to get a lot of gain out of it without going risky on the tune.

If I don't use it, I haven't decided yet if I want to keep it or not. I've got a diesel truck now as my 'toy', and I can see it being useful down the road for that application, so IDK yet.

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I have the open bullet procharger BOV on my car. I like it a lot.
+1. Got the same. Mine is the Big Red one, works and sounds great.

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post #48 of 67 Old May 29th, 2018, 12:15 PM
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I'm @ 499 rwhp through auto trans

Summary:

Procharger D1SC 8 rib setup w/ 2.9" pulley
15% OD Pulley
3 Core Procharger Racing Intercooler

BA2600 MAF

100% Meth injection, alkycontrol system

Stock Auto Transmission

I'm using Tial Q BOV as well.

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post #49 of 67 Old June 5th, 2018, 12:18 AM Thread Starter
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I purchased a 2lb spring that i will be installing this week. I let you guys know if i notice a difference.

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #50 of 67 Old July 15th, 2018, 05:07 PM Thread Starter
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A few updates-

I tried the 2lb bov spring and i didn't like it. I went back to the 6lb spring.

My radiator cracked the other day, so i'm looking for a radiator. Do you guys recommend the sve 3 core radiator?

I purchased a blower guard to replace my cone air filter. I'll let you guys know if i notice a difference.

Lastly, i gutted my trunk, would i notice a difference with a seat delete kit?

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #51 of 67 Old July 15th, 2018, 07:09 PM
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I have the SVE radiator....fitment sucks a big one but it has held up fine for me. Make sure you get the mishimoto radiator supports. They are more flexible than the stock ones and will allow the radiator to move more.

Rear seat delete is maybe worth 20lbs?....

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post #52 of 67 Old July 16th, 2018, 11:52 AM
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Quote:
Originally Posted by mustang562 View Post
A few updates-

I tried the 2lb bov spring and i didn't like it. I went back to the 6lb spring.

My radiator cracked the other day, so i'm looking for a radiator. Do you guys recommend the sve 3 core radiator?

I purchased a blower guard to replace my cone air filter. I'll let you guys know if i notice a difference.

Lastly, i gutted my trunk, would i notice a difference with a seat delete kit?
What didn’t you like about the spring? It’s either working correctly for your application or not.

Here is my Tial with the 2lb spring in action.

https://youtu.be/y0QY53FaJIQ
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post #53 of 67 Old July 16th, 2018, 03:43 PM
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What didn't you like about it? You cannot run the BOV and the throttle body closed at the same time. That will cause compressor surge and ruin your supercharger. The pressure has to go somewhere. Either in the motor or out to atmosphere.

Vacuum holds the BOV open and pressure (boost) holds it closed. The spring just starts it closing. At any position other than wide open throttle the engine is operating in vacuum. I have cruised at 5000 rpm and the engine is in still vacuum. At that RPM the supercharger is building a lot of pressure and that pressure is not going into the motor. I actually blew the return hose (for a more quiet operation) off my CAI when I did that. When I reattached it I accidentally crushed the plastic nipple. That is when I got compressor surge. The boost had no where to go when the motor was in vacuum. I plugged the nipple and now vent to atmosphere.

Its your choice but I think superchargers cost to much to ruin by running a heavy spring.

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post #54 of 67 Old July 16th, 2018, 07:57 PM Thread Starter
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With the 2lb spring that i purchased my bov was open pretty much the whole time; the car felt powerless. With the 6lb spring that i have now, the bov is open when i'm off the gas, and it's closed when i'm on the gas.

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #55 of 67 Old July 16th, 2018, 10:54 PM
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I'm running the Procharger Open Bullet BOV. I'm not sure what lb spring is in it but it's perfect.

---------- Post added at 09:54 PM ---------- Previous post was at 09:53 PM ----------

Quote:
Originally Posted by mustang562 View Post
With the 2lb spring that i purchased my bov was open pretty much the whole time; the car felt powerless. With the 6lb spring that i have now, the bov is open when i'm off the gas, and it's closed when i'm on the gas.
What power are you at with 4 inch pulley?

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post #56 of 67 Old July 17th, 2018, 01:09 AM Thread Starter
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377rwhp @10psi

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #57 of 67 Old July 17th, 2018, 07:48 PM
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377rwhp @10psi
You intercooled? I’m at 6psi and making 367 intercooled.
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post #58 of 67 Old July 18th, 2018, 01:21 AM
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377rwhp @10psi
I have a 3.85 pulley, longtubes, Comp 268 cams and on 11psi I'm at 440/400. Though my dyno numbers are from a very cool day. I only have a 2 core PC intercooler.

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post #59 of 67 Old July 19th, 2018, 02:03 PM Thread Starter
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I have a 3.85 pulley, longtubes, Comp 268 cams and on 11psi I'm at 440/400. Though my dyno numbers are from a very cool day. I only have a 2 core PC intercooler.
How much hp you think the cams and longtubes gave you?

I'm thinking of adding a 3.75 or 3.8 pulley, bap, and retune it. Hopefully it makes 420ish

Mods: Procharger D1sc, 4'pulley, 3 core IC, DW300, 60lb inj, vmp 5000 MAF, Tial BOV, Accufab plenum/75 tb, Catted X Pipe, Magnapack CB, 3.73 Gears, Exedy Clutch, Nittos nt555g2. [email protected]

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post #60 of 67 Old July 19th, 2018, 03:12 PM
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Quote:
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Quote:
Originally Posted by GBPackerFan View Post
I have a 3.85 pulley, longtubes, Comp 268 cams and on 11psi I'm at 440/400. Though my dyno numbers are from a very cool day. I only have a 2 core PC intercooler.
How much hp you think the cams and longtubes gave you?

I'm thinking of adding a 3.75 or 3.8 pulley, bap, and retune it. Hopefully it makes 420ish
Headers probably nothing. Mine didn't help at all once I was supercharged. Cams it's probably hard to tell as it seems his tune is on the conservative side, 2 core cooler isn't helping, as guys with smaller blowers make more power with cams and the same psi. FYI, with a set of correct blower cams for your application typical gains are 60-80rwhp. An NA cam will gain less but guys have made 430-450 on 10psi with NA cams.
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Last edited by blownstang; July 20th, 2018 at 09:05 AM.
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