Worth Going External Wastegate?

[guitaraholic]

After a bit of troubleshooting. I have found that the WGA on the T28 turbo is tits up (diaphragm leaks). There is someone here locally that is selling a turbonetics evolution wastegate for $80. So I have the choice of getting a new WGA, (in other words spending money of stock parts) or go external.

Now if I go external, what other parts would I need besides the external wastegate and an externally gated manifold (megan?) or should I have the stock manifold modified (would it be costly?). Is it worth doing? I do plan on later going to a topmount and something along the lines of gt3071, so I could use the external WG later, but not doing the turbo upgrade for a while.

[Dousan_PG]

get a real turbo before u go ext. wastegage

stock turbo w/ wastegate hahahha
what a waste

ilove wastegate
fire
and hell breaking loose
its the best.

[guitaraholic]

Only reason I am contemplating going external is my Wastegate Actuator is broken, and I have the choice to buy another one ($45) or get an external for $80 and the price of a manifold/weld the stock one.

[Dousan_PG]

get another actuator
get the wastegate later and put it in the closet
do it right
not ghetto
t28 w/ ext gate. ugh

[Flaco S14]

just buy a HKS actuator

[guitaraholic]

Is there a specific HKS actuator that I should look for? Are there different models for different turbos?

[MavericStephenc]

no the sites that sell them (cip motorsports I think) have it clearly marked so it should be easy if you can read.....

[opponheimer]

After being used to actuated waste gate and switching to external diaphragm, I didn't really like it, too loud, and annoying, not subtle.

External was def. better performance wise than internal.. The larger, 38mm opening helped

[eastcoastS14]

lol wastegates are so fucking loud haha impossible to be discrete but so badass.....guaranteed to scare the fuck out of a lot of ppl

[Flybert]

No point. Just get another stocker or an HKS one.

[bejota180sx]

like everyone said get the HKS actuator ive read a lot of good reviews on it, external wastegates are better of for big turbos not stock ones...

...and yeah Ext wastegates are really loud more if u have a screamer pipe... a friend of mine had a turbo scion xb with unknown turbo (dont really remember) and it would scare the shit out of people on the streets it was so loud hahahaha, he recently blew the turbo and went to a t25 with stock wastegate and removed the screamer pipe and the diference in sound is really big its really quiet now compared to the external and screamer pipe... the performance was also reduced but ou well... it still funny seeing a yellow box racing down the strip hahaha...

[guitaraholic]

I was researching a bit, found two choices. the HKS adjustable (though not sure about its range) and another I found here http://www.flyinmiata.com/index.php?deptid=4524&parentid=0&stocknumber=02-70570

Anything else out there with more range. High boost is fun, but if there is a chance I can go down to 5psi or less would be nice on long trips, which would allow for lower octane gas, and then bring it up when needed, yes I know a MBC helps too.

[Dousan_PG]

Anything else out there with more range. High boost is fun, but if there is a chance I can go down to 5psi or less would be nice on long trips, which would allow for lower octane gas, and then bring it up when needed, yes I know a MBC helps too.

hahah
aer you serious?
you drive IN BOOST on long trips??
lay off the gas and cruise
gas mileage is great as such

[McRussellPants]

I cruise at 30psi.





in my duramax

[motorsnail]

I didnt think there was any real "performance" add with a external wastgate. I though it just alowed more air to escape for higher boost and yadda yadda. I look at a external wastegate like a light weight flywheel if its not needed why use it you know? Please correct me on this wanna know the acctual performance gains you get from a larger wastegate other then sound and faster air movement

[opponheimer]

I didnt think there was any real "performance" add with a external wastgate. I though it just alowed more air to escape for higher boost and yadda yadda. I look at a external wastegate like a light weight flywheel if its not needed why use it you know? Please correct me on this wanna know the acctual performance gains you get from a larger wastegate other then sound and faster air movement

Well spiking can be minimized with the external gate, and there are some other factors as well.. for example i have an adjustable actuator on my 2871r and for some reason its cocked at such an angle that no matter how low I adjust the boost by messing with the rod length, the boost always creeps up to 15psi in WOT in 3rd and 4th.. I dont think the gate is opening 100%.. I think I need to reclock theturbo to get rid of that interfering angle some.

[808_Drift]

Quick question while we are all here... is it possible to make a internal wastegate turbo an external? I got a killer deal on a GT2871rs brand new for 600$ and yes its REAL GARRET not some lame cheap ass knockoff. Only thing is id really like to go external. Should i just sell the turbo and get another? or is there a way to make it external?
thanks for any help.

[guitaraholic]

Ha ha, no, not "boosting" down the highway, but seriously, keeping the boost low is good at times because I could use regular gas on a highway drive, and not worry about blowing up if I have to past someone/hit the gas.

[PoorMans180SX]

Quick question while we are all here... is it possible to make a internal wastegate turbo an external? I got a killer deal on a GT2871rs brand new for 600$ and yes its REAL GARRET not some lame cheap ass knockoff. Only thing is id really like to go external. Should i just sell the turbo and get another? or is there a way to make it external?
thanks for any help.

I didnt think there was any real "performance" add with a external wastgate. I though it just alowed more air to escape for higher boost and yadda yadda. I look at a external wastegate like a light weight flywheel if its not needed why use it you know? Please correct me on this wanna know the acctual performance gains you get from a larger wastegate other then sound and faster air movement

This thread reminds me of the DSM forums.

No reason to go external on an internally gated turbo. The cost outweighs the gains.

For motorsnail:
An external wastegate actually allows better flow not only to the wastegate, but out of the turbo. The internal wastegate dump passage actually creates a lot of turbulence in the dump pipe. It's actually best to have the two paths split for 10-12 inches (not very practical on on internal gate).

Less turbulence = more exhaust flow, which is always good for a turbo car.

[guitaraholic]

Just when I thought I made up my mind someone throws in another opinion..lol. So on a T-28, would I see any noticeable gain, either in top end, overall horsepower or spool?

[PoorMans180SX]

Most likely not. Maybe if you do it right, welded in a separator in between the WG dump and the turbine dump. Split the pipes for about 10-12 inches, and then smoothly merged them back together. Then again, you'd probably make the same power if you did all that with an internal wastegate.

So again, kinda pointless to buy an external for an internally gated turbo.

[guitaraholic]

What's the range of the HKS adjustable WGA? Is there a wastegate actuator out there that allows you to change the spring? I have heard you don't want to boost too much over what the spring is set at (if you want consistent boost),

Also, when I took my wastegate actuator off, the wastegate lever on the turbo most very freely, actually it "falls" partially open without the tension of the WGA. The lever basically falls straight down. Is that normal?

[motorsnail]

For motorsnail:
An external wastegate actually allows better flow not only to the wastegate, but out of the turbo. The internal wastegate dump passage actually creates a lot of turbulence in the dump pipe. It's actually best to have the two paths split for 10-12 inches (not very practical on on internal gate).

.

I see now thanks for clearing that up

[g6civcx]

Please look into how much it would cost to fabricate an internal wastegate turbo to accept an external wastegate. You can call a couple of your favourite turbo shops and they should be able to give you a quote.

If you still insist on doing it I don't recommend you doing the fabrication yourself as it does involve a bit of welding and experience in building turbo.

After you hear their quotes you will have better information to go on. Nothing like hearing it from the horse's mouth.

[orion::S14]

No one has mentioned that with an internal...ALL of the exhaust has to pass through the turbine.

With an external gate, dumped or not...you get the benefit of less exhaust flowing through the turbine, and less backpressure. More power.

Now, at the less-than-250rwhp-level...maybe it's not so important.

But for a +300rwhp setup...external WILL show gains.

- Brian

[g6civcx]

No one has mentioned that with an internal...ALL of the exhaust has to pass through the turbine.

With an external gate, dumped or not...you get the benefit of less exhaust flowing through the turbine, and less backpressure. More power.

Now, at the less-than-250rwhp-level...maybe it's not so important.

But for a +300rwhp setup...external WILL show gains.

- Brian

Nobody is doubting that. The OP wants to take an internal one and convert it to accept an external WG. I think that's why everybody is jumping on him.

[PoorMans180SX]

No one has mentioned that with an internal...ALL of the exhaust has to pass through the turbine.

With an external gate, dumped or not...you get the benefit of less exhaust flowing through the turbine, and less backpressure. More power.

Now, at the less-than-250rwhp-level...maybe it's not so important.

But for a +300rwhp setup...external WILL show gains.

- Brian


Technically, all the exhaust doesn't pass through the turbine. It passes through part of the turbine housing, but if all the exhaust passed through the turbine, the wastegate would be useless for controlling boost.

As it enters the turbine housing, it's diverted past the turbine to limit turbine speed.

Also, porting can help a lot with flow.

[808_Drift]

well after reading your guys posts i think i will probably sell it and opt out for a different turbo with external wastegate. This will also give me the chance to do the top mount i originally wanted.