Need Pic of a Lee Thompson DP

[turbowrenchhead]

I might have to go to a external wastegate. I want to know what the flange looks like on a Lee Thompson DP. I think I would cut off my terry houston mach and sell it and fab a Lee Thompson. There must be some kind of backing for the wastegate hole.

 

[Dwayne]

On a LTDP your external wastegate will have to be mounted in the crossover. The flange that bolts up to the turbo is a blank piece of steel. Hope this helps.......somebody will step up this evening and post some pics. I've seen them on here before....good luck

 

[turbowrenchhead]

I know I have to mount it in the crossover. But why couldn't you mount it in the up pipe and vent it back into the down pipe?

 

[WFO]

i don't see why you couldn't.the only thing i can think of is that i remove the top piece of the dp to change the plugs on that side,and having the wg there would be one more thing to have to mess with.

hey wrenchead,what ended up being the problem with your headgaskets?

 

[T- Type Tim]

Thats exactly how mine is done, the deltagate is on the up pipe and is connected to the dp . This is the same way the waste gate is serviced much easier.

 

[cool 84]

I was thinking of mounting the WG in the same place but with the CA smog nazis, the extra heat it would have to endure, and the extra clutter it would add to the engine compartment I decided on the crossover. Like Big Daddy said, it's no more than a flat piece of steel that blocks the stock hole off. I have a pic of my motor in the TB relocation sticky at the top of this section. I had to cut and weld in a section to clear my dual stage headers but you can at least see what the flange looks like.

 

[turbowrenchhead]

TA Performance said that they seen the exact same thing. I think that the Fel-pro's just dont like the aluminum heads. Also the torque specs that champion gives you are too low. I bumped the torque up 5 pds on the original specs and did 2 cold retorques. I also went with the cometics head gaskets. Its a multishim gasket witch I think is the best design of head gaskets out there for a aluminum on iron block. I also went to head studs for more fasnening strengh. I seemed to do the trick so far.
I ported out my wastegate hole on the exhaust turbine more. It is better now. It doesn't creep so much. But I think the heat shield is still rubbing. I get up to 15 psi and when the puck wants to close the heat shield is holding it back and my boost goes bub bye. Till I get on it again. Its either that or the puck is getting stuck in the hole cocked. I hope its not that. That would suck! Than I would defintly have to go to external then.

 

[1QUICK85]

Got her running agian........

 

[turbowrenchhead]

So is it spooling now Nick?

 

[Chad Oliver]

Here's a pic: http://community.webshots.com/photo/83551125/83552039lYFNtv

 

[turbowrenchhead]

Would it be overkill to use both internal and external wastegate? Thats if I can't get a control on my boost. It would be more work and money to get a pipe fabed up to change over to a true external gate.
On another note. The tranny guy called me and he is waiting for parts. Its going to winter before I get to drive this thing.

 

[turbobooster]

hey guys i have a question it may be a little dumb but i know u guys still help out alot i read about u guys talkin about and external and internal wastegate on ur downpipe ? im have no clue what u guys mean by that i mean i know here the downpipe is onmy ride and i know the wastegate near the turbo but can u explain the externsal and internal diferences and does that repalce the one near the turbo or what please help me teach a little bout these basic terms thank u

 

[turbowrenchhead]

Internal wastegate has a puck venting the hole in the exhaust housing of the compressor. When boost is reaching your desired limit the puck opens and lets exhaust bypass the turbo.
External wastegate is mounted on either the crossover or the uppipe. It works the same way. It opens to let exhuast bypass your turbo. With an external you can let the bypass exhuast vent into the atmosphere witch few ppl like. Or have it run back into the downpipe.

 

[cool 84]

A wastegate is just a valve that opens to let some exhaust bypass the turbo to control your boost level. The factory valve contained in the turbo/aftermarket downpipe is usually too small to bypass enough exhaust to control boost on a highly modified motor plus it's slower to react.

An external gate is usually welded to your crossover pipe, before the turbo. It does exactly the same thing as the factory piece but the valve is twice the size and opens much farther. They provide very precise control of boost, no spiking or boost creep. When you hit your max boost setting it opens up, letting some exhaust out of the crossover, bypassing your turbo. It can either dump the exhaust into the atmosphere (loud) or have another pipe welded to dump it back into your exhaust system after the turbo.

 

[turbowrenchhead]

Brent, how much was your gate? Where did you get it from?

 

[turbobooster]

oh ic well i am sort of havin this problem when i gun it off the line on my car it takes off really nice and my boost builds as its buildin and it gets to the red section i have to let off the gas if not i get this pop or crack down below somewhere in the car (i have no clue) could this have anything to do wit my original factory wastegate what could be the problem ? i would think once i hit the pedal to the metal i can keep my foot on it but i get this ?

 

[cool 84]

LOL. Boost into the redzone and then a pop and crack down below. I think it's safe to say to keep your foot out of the gas until you get the problem fixed or you'll be looking at a minimum of blown headgaskets. If you have an adjustable wastegate, make sure it's not too tight. After that, go through vacuum lines and make sure they're not cracked and hooked up right.

 

[turbobooster]

so i guess im better off just gettin whole new stock turbo or rebuildin my whole turbo ?

 

[turbobooster]

and where can i get this lee thompson 3 inch downpipe?

 

[cool 84]

No need to replace or rebuild the turbo. Most likely it's just a broken, missing or misrouted vacuum line or the wastegate just isn't adjusted correctly. At the worst you could need a new wastegate but they're pretty cheap and take about 10 minutes to replace.