New downpipe now I cant build boost

[blackazz]

Well guys I just bought a used 3" downpipe thdp now I can't build boost past 8lbs without it backfiring an blowing all my hoses off,like vac brake line,egr an other little lines on vac block.What's my problem now?

2nd place is 1st place loser!

 

[CGASTON]

Sounds like he puck on the DP is to small for the actuator hole on the turbo. This is a common thing. I have an ATR with external wastegate that I will trade ya.

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[coach]

Can you say "ZIP-TIES"!!! What kind of boost controller do you have?

Thanks
Coach

 

[blackazz]

Can you say "ZIP-TIES"!!! What kind of boost controller do you have?

Thanks
Coach

I tried the zip ties helped on the vac block but not the egr valve an I'm still running the stock wastegate an no boost contoller.Only running 17lbs of boost,didn't have this problem before I put this pipe on.So is it my puck?

2nd place is 1st place loser!

 

[coach]

Sorry, Im not sure. I am new to the internal pucks. I always had an external wastegate until this year. Im trying to figure out how the system is blowing off lines with 8#'s of boost. Are you getting this reading in more then one place, ex. Boost gauge and data logger, or the factory dash boost lights?

 

[TurboDave]

CGASTON, Please explain to me how a too small a puck can cause backfiring at only 8# of boost.

 

[blackazz]

Sorry, Im not sure. I am new to the internal pucks. I always had an external wastegate until this year. Im trying to figure out how the system is blowing off lines with 8#'s of boost. Are you getting this reading in more then one place, ex. Boost gauge and data logger, or the factory dash boost lights?

Well I'm getting the 8#'s from my boost gauge(external) my scanmaster don't say nothing an fuel pressure when this happen is 50lbs.So ill take the pipe off an check the sz of the puck.

2nd place is 1st place loser!

 

[blackazz]

Well by the way turbodave jumped in,It might not be the sz of the puck.

2nd place is 1st place loser!

 

[TurboTGuy]

Well by the way turbodave jumped in,It might not be the sz of the puck.quote]

Size does matter........ ask me how I know.

 

[blackazz]

Size does matter........ ask me how I know.

So great wise one. Was that a pun?

2nd place is 1st place loser!

 

[charlief1]

So great wise one. Was that a pun?

For him, no. For the rest of us, yes.

 

[TurboTGuy]

So great wise one. Was that a pun?

2nd place is 1st place loser!

In reality, no.

In this case yes, yes it was.....

 

[TurboTGuy]

For him, no. For the rest of us, yes.

True, but a TR helps "compensate"..............

 

[charlief1]

In reality, no.

In this case yes, yes it was.....

Liar!

 

[blackazz]

In reality, no.

In this case yes, yes it was.....

Ahhh funny guy!

2nd place is 1st place loser!

 

[TurboTGuy]

Liar!

Ah, but you misread sir, I said in reality it was NOT a pun (*sniff, whimper, WHAAAAAAAAA!*).

 

[CGASTON]

I would check the puck. TH puck size is 1 3/8" in size. The actuator port he is 1 4/8ish". So all in turn,

1. your puck is letting boost pass by and not building boost. Then all of a sudden you have a boost creep/spike from the amount of pressure.

2. That pressure caused can cause your inlet hose to pop off and detonate.

That is why that RJC makes a bigger puck, 1 5/8", and a block off plate that you drill out to match your puck. He also makes a flange with the puck already installed. So if you know a good tig welder then there you go. I know several people, including myself (have THDP) on booth of my cars. THDP was and is still a great DP. Just back then before the TE turbos the actuator hole was not that big. Now if you search the forum for TH puck, you will read all about sudden boost creep/spike. Just saying. Who am I, not one of the big dogs on this site with attitude.

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[blackazz]

I would check the puck. TH puck size is 1 3/8" in size. The actuator port he is 1 4/8ish". So all in turn,

1. your puck is letting boost pass by and not building boost. Then all of a sudden you have a boost creep/spike from the amount of pressure.

2. That pressure caused can cause your inlet hose to pop off and detonate.

That is why that RJC makes a bigger puck, 1 5/8", and a block off plate that you drill out to match your puck. He also makes a flange with the puck already installed. So if you know a good tig welder then there you go. I know several people, including myself (have THDP) on booth of my cars. THDP was and is still a great DP. Just back then before the TE turbos the actuator hole was not that big. Now if you search the forum for TH puck, you will read all about sudden boost creep/spike. Just saying. Who am I, not one of the big dogs on this site with attitude.

Sent from my iPhone using Turbo Buick

Thanks a stright answer.

2nd place is 1st place loser!

 

[CGASTON]

Hope that this helps. Just measure your puck and actuator. If your puck is 1 5/8", then I would look else where but this sounds like the issue.

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[TurboDave]

Hope that this helps. Just measure your puck and actuator. If your puck is 1 5/8", then I would look else where but this sounds like the issue.

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I'm still confused. If the puck is smaller than the hole, yes, there will be a problem building much boost. But where does the spike/creep come from????? Boost creep/spike are usually caused by a hole that is too small and won't allow enough gasses to bypass.