Wastegate location

[Eddie Wilson]

I just got my HKS GT 60 wastegate today. I am looking for some advice on mounting this thing. I am running a Precision 101 mm turbo with 3 in crossover pipe. I would like to fab a merge type pipe to the wastegate , but I dont think I have enough room to do this. Is there gains in the merging pipes into the wastegate? Or will single pipe to the W/G located at the square turbo flange be just as effective? I would like to hear some opinions on the best way and location to mount my wastegate.
Thanks
EWW

[Dan Neumann]

I can't really answer your question since we're putting together our first turbo effort also. Cool thing is were putting it all in the same body style. Ours is twin 88mm Precision GT4788s feeding an ex-prostock 500ci motor that's obviously been converted for the turbos. It's going into our Outlaw 10.5 1980 Z-28. I've been told to keep the WG as close to the turbo as possible if this helps.

[Six_Shooter]

I was hoping taht one of those pics would show the merge into teh turbine a little better, I would then mark it where I would idealy place it.

Best is to place it just before the turbine inlet, and make the transition as smooth as possible from the main pipe to the wastegate.

If 0* is in the direction of flow and 180* is the opposite direction, best would be as close to 0* as possible. Usually it is recommended to be less than 45*.
Better yet having a Y connection into the turbo. The bottom part of the Y is the tube from the headers the left seperation is the WG and the right seperation is the turbo.

[gasguzzler]

I was hoping taht one of those pics would show the merge into teh turbine a little better, I would then mark it where I would idealy place it.

Best is to place it just before the turbine inlet, and make the transition as smooth as possible from the main pipe to the wastegate.

If 0* is in the direction of flow and 180* is the opposite direction, best would be as close to 0* as possible. Usually it is recommended to be less than 45*.
Better yet having a Y connection into the turbo. The bottom part of the Y is the tube from the headers the left seperation is the WG and the right seperation is the turbo.


I agree with what Six_Shooter said. You want it to be as close to the turbine housing and you want the exhaust energy to make a soft bend (45* usually works well) to go out the wastegate. This will allow the wastegate to flow more volume. Nice looking ride!

- Brian

[Eddie Wilson]

The pipe used to mount the waste gate would have to be aprox. 2 3/8 diameter ( to attach to the wastegate's v-band)
If flow is the concern it may be best to locate the pipe on the under side of the 3in-3in merge.Due to the cross over going "down" to the turbo. As close to the turbo's crossover flange as possible in a 45degree? How long should the pipe be? (to the wastegate) Does it matter. I planed on dumping the wastegate's exhaust into the 5 in down pipe in a 45 degree angle to help scavenge the wastegate.
Thanks
EWW

[Six_Shooter]

The pipe used to mount the waste gate would have to be aprox. 2 3/8 diameter ( to attach to the wastegate's v-band)
If flow is the concern it may be best to locate the pipe on the under side of the 3in-3in merge.Due to the cross over going "down" to the turbo. As close to the turbo's crossover flange as possible in a 45degree? How long should the pipe be? (to the wastegate) Does it matter. I planed on dumping the wastegate's exhaust into the 5 in down pipe in a 45 degree angle to help scavenge the wastegate.
Thanks
EWW

Are you driving this car on the street?

If you are, then continue on, with the returning the WG exhaust back into the DP. If it's a track only car, run it independant, and try and keep it as short as possible. Some guys will run a dump pipe straight down, to exit under the car, others will bring it out the fender and have it exit there.

Basically you want as smooth of a transition as possible from teh main pipe to the WG for optimum flow control.

[Eddie Wilson]

If I am not mistaken , the ORSCA rule state that the wastegate exh. dump must exit thru the 5 in down pipe. How about it Dan Neumann? True or false?

[Six_Shooter]

If I am not mistaken , the ORSCA rule state that the wastegate exh. dump must exit thru the 5 in down pipe. How about it Dan Neumann? True or false?


Or whatever rules dictate. :lol:

[Eddie Wilson]

Thanks for the help.
EWW

[Dan Neumann]

If I am not mistaken , the ORSCA rule state that the wastegate exh. dump must exit thru the 5 in down pipe. How about it Dan Neumann? True or false?

I just checked the ORSCA rules for all heads up classes and nothing is stated about where the wastegate exhaust must dump. I know Lynch's dumps straight down to the ground and he runs ORSCA all the time.

[Eddie Wilson]

Dan, my bad. I thought I read it in the past. It must have been another organizations rule. I knew you would know the rules.

Routing it into the atosphere it the most simple.

I figured if you installed the dump in the down pipe in a 45 it would scavenge the wastegate better. Kinda like a headervac system.

Hell, I don't know nothin about turbos. All new to me. I,m justa backyard do it yurself, cause im broke as hell kinda guy.

I appreciate everyones info and knowledge.

Dan N. How about some photos of the 80 Z28 with twins?????

[Six_Shooter]

The scavenge idea seems plausable, hell I did that with a turbo set-up I built recently, well that and space required me to set it up that way. :lol:

[Eddie Wilson]

Dude! "plausable" Are you watching Myth Busters? LOL!

I understand what you are saying...... I plan on inserting the dump tube about 1/4-1/2 into the 5in down pipe, in a 45 degree angle and cut the protruding dump tube at a 45 degree and hope it wil create a venturi effect and scavange the HKS. I hope its plausable ! I would like to do a (2 into 1) merge from both down tubes into the HKS , but I dont think it will happen with the area it has to stay within.
Kinda Like 20 pounds of shit in a 10 pound sack!
EWW

[2angry]

i dont know much about the whole turbo thing either but i installed a supercharger in a buddies carb'd mustang using an carb inclosure, i piped the wastegate back into the intake, in front of the charger, this is how i seen it on a set up at summit, is this good or bad

[Eddie Wilson]

On a supercharger are you talking about a BOV? I thought the purpose was to relieve the boost pressure when the throttle is closed. I dont know about plumbing back into the intake. ???

[Six_Shooter]

i dont know much about the whole turbo thing either but i installed a supercharger in a buddies carb'd mustang using an carb inclosure, i piped the wastegate back into the intake, in front of the charger, this is how i seen it on a set up at summit, is this good or bad


That is a Blow off or bypass valve.

A wastegate vents exhaust gasses before they have a chance to go through the turbine as a way of controlling turbine speed and subsiquentally boost pressure.

Nah, I haven't watch that show in like 8 months.
Besides, I've been using that word since well before Myth Busters came out. ;)

[Eddie Wilson]

Here is a couple pics of my wastegate install. I hope it will works OK. Next project is to run the 5 in exhaust down pipe behind the front tire. Should I dump the wastegate into the 5 in exh. or not?
EWW

[Maliboost]

He must be talking about the BOV/bypass. IIRC its the Vortech setups that plumb the BOV back into the suction side of the blower.

I had a buddy that had an LS1 Bird that had a cent blower on it & the BOV was routed back into the suction side of the Super Charger. not sure why they did it, I seem to recall that it had something to do with the MAF sensor. dunno for sure, it was a LONG time ago. LOL.

It was pretty bitchen though. it had just over 800 HP to the wheels on the blower & a small shot of N2O. It did not last too long, it blew a head gasket, I think it was those stupid head bolts that gave out on him.

Eddie, that thing looks GREAT. I wish I had kept my RS. Im trying to deal with room issues of my Chevelle & its not great, like it was in the Camaro.

BTW, do you have a glass front end for that, or is it still metal?

Bob

[Six_Shooter]

Yeah if a MAF is used and is pre BOV, then the bypassed air should be routed back into the intake, pre-charger. Also the fact that MANY BOV/bypass' are open at least slightly at idle and part throttle cruise (high vacuum situations), then there would be a false reading if the metered air was allowed to escape or more air was being pulled in through the BOV then is being metered.

Agreed, Eddie, that looks absolutly mint, and with the way you have each bank merging together, I can't see a better way of plumbing the WG than you have there.

[Eddie Wilson]

Thanks Guys,

Maliboost: The car is all steel and glass except for the hood.Stock front sub , stock rear frame rails( just a notch in the rear) mini tubed with the stock steel wheel wells. N/A it weighed 3000 with driver. I hope to keep it around 3200 with the turbo.

The locating wastegate worked out good. I still plan on adding a couple V bands just above the w/g merge. It takes alot of cutting and fitting to get he merge to fit just right. I hope it was worth the effort.

[Slow 69 SS]

Question...

Any concern with all the heat generated at the turbo being in front of the radiator?

[Eddie Wilson]

Yeh that is a concern. The radiator will be located very low to draw in air from below the turbo. Also a shroud will be fabbed, also a deflector to direct the airflow to the radiator. We will see .

[Broke]

I have also heard that the closer to the collector the better for the WG. The theory is the exhaust velocity will be lower thus allowing it to go out the gate instead of going by at full speed. Anyone else heard it this way?

[Dan Neumann]

Dan, my bad. I thought I read it in the past. It must have been another organizations rule. I knew you would know the rules.

Dan N. How about some photos of the 80 Z28 with twins?????

I'll post some pics soon. We're just getting started with this project and are still waiting on some parts. We got the turbos located and the route for the tubing figured out, just waiting for UPS to show with goodies. :)

[Dan Neumann]

Here's a few pics in case you haven't seen them on the trash or be trashed page. I'll have more soon.

[redvictor]

you'll probably need to make a support and make a slip joint for that wastegate.
As the "gate" is heavy it'll sag when those headers become red hot(as they surely will).As the weld is on a bend it'll be prone to cracking also,because the weld stresses the metal in that area...... I used 2 x 5/16" rose joints with some chrome moly tubing for the support and made a double slip joint with bolts and locknuts(loose) stopping them coming apart.
Nice work though....