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Old 06-29-2013, 02:59 PM   #26
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Comp Turbo
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Old 06-29-2013, 03:04 PM   #27
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Quote:
Originally Posted by pincushin3819 View Post
I'm having the same problem with my HPS kit, I payed for an upgraded 80mm turbo for my 418 from Chris & come to find out I might have a 72mm or even a 67mm on there. Either way the turbo is to small even if you could put a bigger down pipe on there which is already about to touch the oil cooler as it is now that would be just half the problem. PCM has my car now & have been awesome to deal with, we are trying to figure out the best way to solve this problem. I have been talking to a local fab guy that works with PCM for turbo builds & we have come up with a few good ideas on how to fix this. Our goal is to find a location that is big enough for at least a 76mm turbo with no less than a 4 inch down pipe ether by moving the turbo like some have mentioned to another spot like behind the head light or even making a front bumper support & moving the intercooler & radiator out a few inches for a bigger turbo.
PCM has mine as well, they are great to work with. I would do something of that nature but I am just ready to foot the bill for it. Not this close to Camaro Fest anyway.
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Old 06-29-2013, 03:24 PM   #28
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You are in a tough spot and really can't afford to get yourself out of correctly. You should probably take this mess off your car and put it back to n/a.
Kind of. Its not really as tough of a spot as it could be, I just want to minimize the backpressure and take that strain off my system. I am not changing the whole system and the turbo whine is too addicting to get rid of either.

Go back to stock, why would anyone do that. Its still sitting at 546 HP and 599 Tq, going back to stock would be like driving a Prius.

If the answer is as simple as being out of turbo, then so be it. I will live with what I got until I can financial justify doing further changes. However, there is always something that you can do that will not break the bank and still improve the situation. Throwing money at it is not the answer to every question on C5. I am just trying to figure out what is the correct route to take.
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Old 06-29-2013, 03:38 PM   #29
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Old 06-29-2013, 04:28 PM   #30
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Originally Posted by partymn View Post
Kind of. Its not really as tough of a spot as it could be, I just want to minimize the backpressure and take that strain off my system. I am not changing the whole system and the turbo whine is too addicting to get rid of either.

Go back to stock, why would anyone do that. Its still sitting at 546 HP and 599 Tq, going back to stock would be like driving a Prius.

If the answer is as simple as being out of turbo, then so be it. I will live with what I got until I can financial justify doing further changes. However, there is always something that you can do that will not break the bank and still improve the situation. Throwing money at it is not the answer to every question on C5. I am just trying to figure out what is the correct route to take.

I think I see now how you got into this current mess. Enjoy.
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Old 06-29-2013, 04:54 PM   #31
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How is that, please enlighten me. If the answer is that I am cheap, you are correct.
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Old 06-29-2013, 05:12 PM   #32
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Sell it and buy something properly setup. There will be no cheap way to fix it, and throwing more money at it won't ever get it to where you want it. Put it on ebay, sell it to someone who will be happy with 500rwhp, and then buy a nice turbo kit.
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Old 06-29-2013, 05:17 PM   #33
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That may be an option in the future, if I find no other options. I just hate to break the budget and go backwards. Unless PCM can find a cheap option I guess I will have to live with what I got for now.
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Old 06-29-2013, 06:27 PM   #34
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There is not a cheap option.
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Old 06-29-2013, 06:41 PM   #35
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You were already told. The only way to get the BP down without spending the money for another turbo and additional work is to turn down the boost. Drop it to 5psi and live with it for now and at that level the turbo should last and you shouldn't damage anything. Save money and either modify what you have or scrap it and go another route....lesson learned although it was the hard way sometimes ....well a lot of the times that is what happens.
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Old 06-30-2013, 06:29 AM   #36
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Yup. U hit it. To give you an idea, my GN at 30psi had almost the exact same pressure in the exhaust mani. 6176 turbonetics turbo...76mm hot side with a .63 AR for spooling. That was a 3" single shot down pipe and exhaust on 3.8 with stock heads.
The .82 AR isn't going to help much. A single turbo is still a good choice. But IMO, 76mm. And with a turbo that big you want the exhaust wheel that size minimum and never neck down. So 3" to a dual 3" catback would be fine. Even 3" to a dual 2.5" catback would be ok. You have to use some type of straight through no back pressure muffler.
It would be worth your time calling precision turbo and seeing by chance if Patrick still works there. If not get one of the other techs and tell them what your are turbocharging and what your goals are. They don't have a kit, but they will tell you proper snail size.
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Old 06-30-2013, 09:27 AM   #37
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if its got that much back pressure then there should be room to grow. back pressure is just a measurement of restiction.
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Old 06-30-2013, 10:27 AM   #38
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Thanks guys. My build budget will not hold up with the extra expense of changing the turbo. Looks like I will live with what I got until after Camarofest, then I will change to the biggest turbo that I can fit in that space safely.
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Old 06-30-2013, 11:19 AM   #39
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you can probably spec a custom cam for a backpressured system, not sure HOW much this could help but I know it does.
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Old 06-30-2013, 11:20 AM   #40
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How much do you have to spend then? You can get the correct turbo for $1300 or so. You can sell yours for $600-700. So you need to invest $600-700 to get it fixed. That isn't bad at all.
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Old 06-30-2013, 12:10 PM   #41
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I can get you a comp pretty cheap party when you get ready. A ct43 76/79 would be great and would be very similar in size about an inch bigger. I thought these kits came with a ct43 but when I look back at the hps sale thread they are ct4's which is even smaller than I thought.
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Old 06-30-2013, 12:45 PM   #42
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Yea its a CT4 67/67 with a .96 AR. JLE58, how cheap are we talking?
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Old 06-30-2013, 01:27 PM   #43
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I'll get you a price in the am and pm you.
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Old 06-30-2013, 01:28 PM   #44
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Cool thanks.
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Old 06-30-2013, 05:18 PM   #45
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Couple of quick questions. Since u have probed for boost pre turbo, unbolt everything from the downpipe and see what changes. You have cats? Surely not.
I wonder if it's how the banks are brought together pre turbo.
Just trying to brainstorm cheap help options first.
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Old 06-30-2013, 05:34 PM   #46
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Once I get it back from the tuner I am going to install exhaust cutouts. I guess I could buy a pressure gauge and check to see how it affects the pressure. No cats, removed those when I installed the kit. I wouldn't think that I have issues pre turbo, it comes straight off the headers and down into the turbo.
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Old 06-30-2013, 11:51 PM   #47
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I have the tnetics kit and am running 11.5 with a custom cam. I am also running 100 octane to keep things happy. Ted is my tuner and says that it's maxed out as we are seeing minor kr at the top of the longer gears. Tnetics came out with a 7575 that I am looking at. I was going to buy it but it's at least a month + wait for a watercooled center section so if I do I am thinking over the winter. A 75 vs my 68 and a billet compressor wheel should have it all over my current turbo.
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Old 07-01-2013, 02:42 PM   #48
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yeah...bigger turbo is what is needed. how big are the banks coming into that junction at the turbo? 2.5" each side?
bigger turbos also mean optimizing downpipe size. You can put a 76mm hotside on a 3" downpipe...but I'd bet it would improve a bit if it's on the 'island' with a 3.5" downpipe.
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Old 07-01-2013, 07:38 PM   #49
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3 inch banks going into the turbo. I am working on a bigger turbo and 4 inch down pipe. Sucks because I will have to do something with the oil cooler that I just installed, probably a remote system of some sort. Then it will be back to PCM for further tuning.
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Old 07-01-2013, 11:47 PM   #50
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Bigger turbo enuff said. Sold the comp for 450.00. Had less,then 150 miles on it. Are you smoking at all? Also, I'm seeing the effects of forward facing headers. To hot! I'm gonna look at changing my system before the heat does more damage to every wire or hose in my bay. Let's face it, one of the worst designs I've ever seen and I was to stupid to see it. Happy though with the precision turbo I have now.
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