Anyone running this on a 3076/3052?

[daren_p]

I came across this comp cover on Ebay for the 4" PS 3076/3052 compressor cover. It looks like the same piece I've seen on HKS turbos. I don't think its a whole new cover I think its just the horn shaped piece that slips down on the ledge thats just above the comp wheel & locks in place with 3 set screws that fit through the drilled/tapped holes that come from factory. It looks like it may help with spool & top end as I would think it would create smoother airflow into the comp inlet. Just wondering if others are running it & your thoughts or before after results if any?

http://cgi.ebay.com/ebaymotors/GT30...742QQitemZ250084422701QQrdZ1QQsspagenameZWD1V

If you look at the HKS pic, its looks to be a 2 piece design as well.

 

[CanadianTSi]

I would think it would decrease the effectiveness of the Surge Ports, but you could always try it and let us know.

 

[daren_p]

What makes you think it would decrease the effiency of the surge ports? It doesn't effect the inlet of the surge ports but maybe this will reduce turbulance not allowing as much uncompressed air to bypass? Or maybe the increase in port outlet restriction? You would think they wouldn't be used by HKS if they hindered performance.

It looks like a neat item to try but kinda expensive if it doesnst work.

 

[CanadianTSi]

Yah I kinda had a brain fart there on how the surge ports work. It does look like it would help smooth out the flow into the compressor which is a good thing.

 

[topnotchgsx]

Looks kind of like a silencer ring that holset uses on turbos to keep the noise of the turbo down (i.e. the whistle) They use these on big diesel trucks because they push about 40-50 psi so I am sure the whistle is louder to them. HAHA.

Here is a quote from the site i got the pictures:
"A silencer ring is a metal baffle placed into the turbocharger inlet to reduce whistle from the turbocharger. It is installed in Ram truck engines at the request of Chrysler. The silencer ring has no effect on engine output, EGT, or boost levels. It does significantly reduce high frequency turbo whistle."

Without the ring

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With the ring

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Keylan

 

[daren_p]

Looks kind of like a silencer ring that holset uses on turbos to keep the noise of the turbo down (i.e. the whistle) They use these on big diesel trucks because they push about 40-50 psi so I am sure the whistle is louder to them. HAHA.


Keylan

Hmmm, well not quite the same thing but if this has the quietning effect as well, defently don't want that as the turbo noise was my whole reason for buying a GT series turbo

 

[Slow99x]

Yeah, I miss the spool noise my FP3052 made. I have a GT3582 now with the drilled surge ports and I can't hear the turbo over my exhaust. The smooth inlet will help power production and that little area there at the edge where the surge ports are still visable should be enough to prevent surging. I'd say get it. You might loose some of the sound but I think you'll gain power.

 

[definitiveno]

hmmmm, in the definition it says it has been revised to further reduce surge but also that it has aided in up to 500 rpm quicker spool, so does this part do some sort of correction to airflow that allows the turbo to flow air more efficiently on the left of the surge line? This seems to be what it's indicating, wouldn't touch it without some sort of datalogging testing prior however.

 

[daren_p]

hmmmm, in the definition it says it has been revised to further reduce surge but also that it has aided in up to 500 rpm quicker spool, so does this part do some sort of correction to airflow that allows the turbo to flow air more efficiently on the left of the surge line? This seems to be what it's indicating, wouldn't touch it without some sort of datalogging testing prior however.

Ya it does sound like abit of a contradiction but you know good ol Ebay descriptions If it was $50 or something I'd probably just give it a shot but by the time it gets here with exchange, shipping, taxes, etc. it'll probably run me around $200 (good ol CDN $), which is kinda pricy for something that may turn out to be a paper weight. If no one is running one, I still may pick one up down the road to see if there are any benefits & of course there will be back to back logs done to prove differences

 

[ThingyNess]

From what I've heard, the FP-series turbos and the GT307x counterparts are quite close to the surge limit right out of the box on a DSM.

On a big diesel, you're likely not operating as close to the surge limit, so it's no big deal to put the "silencer" ring in there and delete the surge ports. Same deal, in HKS's applications, it might be useful to have the slightly more laminar flow of the bell-mouthed inlet like the one you show on ebay.

Fluid Dynamics is a funny thing, and Garrett designed those ports there for a reason. Mess with them at your own risk. From looking at the way that inlet bell is shaped, I'd wager that it would severely reduce the usefulness of the surge ports, which are pretty important on a DSM application. I certainly have heard of some T3-housing GT3071R's surging when they were used with a .48 or .63 housing on a DSM.

Also, one minor nitpick, but it seems that very few people actually understand how the surge ports on a turbo work. They are outlets, not inlets. They allow extra air to flow out of the compressor wheel back into the inlet to make the compressor "think" it is flowing more (and therefore be to the right of the surge line). At no point does air flow into the little surge ports.

 

[definitiveno]

Hey daren, I might be willing to go in on one with you to test that puppy out. This month I dont have cash to kill but may for sure.


I figure we are both interested to see if it works so we could go in on the part, if it's junk neither of us lose too much finding that out and if it's good you can buy me out and I'll opt to pick one up for myself.

 

[daren_p]

Also, one minor nitpick, but it seems that very few people actually understand how the surge ports on a turbo work. They are outlets, not inlets. They allow extra air to flow out of the compressor wheel back into the inlet to make the compressor "think" it is flowing more (and therefore be to the right of the surge line). At no point does air flow into the little surge ports.

Like I stated above, the inlet to the surge ports aren't effected, I'm sure you know the inlet side is the machined out portion thats mid way through the compressor wheel. The outlets are the portion that can be easily seen on the sides & what makes it a 4" inlet. These allow some air to get bypassed or returned to the inlet side before it gets compressed, see figure below.

As I said above the only way I could see it effecting the surge ports is if the now more linear flow doesn't allow as much air to be bypassed (as the inlet cone should reduce turbulance into the comp wheel) or if the edge of the inlet cone restricts the outlet of the ports to much, also hindering bypassed airflow.

 

[daren_p]

Hey daren, I might be willing to go in on one with you to test that puppy out. This month I dont have cash to kill but may for sure.


I figure we are both interested to see if it works so we could go in on the part, if it's junk neither of us lose too much finding that out and if it's good you can buy me out and I'll opt to pick one up for myself.

Yeah, we could probably do something like that. Since this will just be a new setup for me, it will take abit to get everything up & running 100% but maybe a couple months down the road we can look into it .

 

[Slow99x]

If the surge ports are outlets on the turbo you have pictured then how do the drilled surge ports prevent surge? They can't be outlets so there must be another theory to the drilled ones.

 

[1gcrazy]

If the surge ports are outlets on the turbo you have pictured then how do the drilled surge ports prevent surge? They can't be outlets so there must be another theory to the drilled ones.

Why not?

Why can't the drilled surge ports work? Its the same concept...just different design.

 

[Boosted98gsx]

The drilled ports don't go all the way to the exducers, just all down to the same level in the cover material and that ring (on the garret turbos) is machined into the turbonetics comp covers as well.

 

[ThingyNess]

Hmm, odd, I re-read the thread and I don't see the post anymore where someone was referring to the surge ports as inlets. Oh well. My mistake, I guess.

I would still wager that the ring would definitely allow more laminar flow into the turbine inlet, and increase compressor efficiency and maximum power, while increasing its susceptibility to surge. Whether the added tendency to surge is an issue or not will depend a lot on your application, exhaust housing, etc.

 

[Slow99x]

Why not?

Why can't the drilled surge ports work? Its the same concept...just different design.

Umm... I never said they wouldn't work. I have them drilled into the cover of my 3582R. I said that they are not outlets and I wanted to know how they worked.

 

[Slow99x]

Can anyone tell me how the drilled surge ports work?

 

[daren_p]

Okay, bringing this one back. Saw new pics of the FP3065's & they now include a compressor cover like this, so it got me thinking about these again. Since I've ran the 3052 for a summer now & know how it performs, next summer would be ideal to test this out & see how it performs. Problem is I tried to find it again on Ebay (where I found it before) & can't seem to see any. So was wondering if anyone has seen them forsale or I guess has anyone installed one of these yet?

 

[Steve93Talon]

Ask FP or any Garrett vendors?