08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

Bnr k04-gt28

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Old 01-23-2011, 08:29 PM
  #726  
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Anyone running the stage 1 yet? If so, is it just a bolt on, tune, and ready to go? Sorry, I'm a novice.
Old 01-23-2011, 09:01 PM
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How much lbs/min are you seeing through the MAF?
Old 01-23-2011, 09:02 PM
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Originally Posted by HHRSSouth
So what is the sweet spot psi wise for effeciency with the 2871R on our engines?
Probably (14.7 x [2.25 - 1] = ~18.5 psi) for the turbo itself for most flow vs efficiency, though you may be better off sticking to the normal range (20-23psi) that our cars tend to like for best overall results at the end of the day.

Garrett GT2871 Compressor Map

Old 01-23-2011, 09:07 PM
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i was running 26psi on the gt2871 kit i had on it was just fine. look at sig.
Old 01-23-2011, 09:12 PM
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Originally Posted by hunter19707
Anyone running the stage 1 yet? If so, is it just a bolt on, tune, and ready to go? Sorry, I'm a novice.
Thats the idea for the Stage 1. Everything is retained on the stock unit except for the internals of course
Old 01-23-2011, 09:14 PM
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Originally Posted by turbo_chevy_cobalt
i was running 26psi on the gt2871 kit i had on it was just fine. look at sig.
I would rather take a hit in hp if it meant I wasn't just blowing hot air with minimal gains over running a lower psi.
Old 01-23-2011, 09:16 PM
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Originally Posted by turbo_chevy_cobalt
i was running 26psi on the gt2871 kit i had on it was just fine. look at sig.
Originally Posted by HHRSSouth
I would rather take a hit in hp if it meant I wasn't just blowing hot air with minimal gains over instead of running a lower psi.
Yeah, I guess I'm just saying that it's going to be different depending on if you're talking about the turbo or the particular car.

Not saying it can't be cranked up, but usually people want an efficiency baseline as far as the turbo. Once you decide to start going up in boost, you start running into compression-related obstacles.
Old 01-23-2011, 09:19 PM
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Originally Posted by Stamina
Yeah, I guess I'm just saying that it's going to be different depending on if you're talking about the turbo or the particular car.

Not saying it can't be cranked up, but usually people want an efficiency baseline as far as the turbo. Once you decide to start going up in boost, you start running into compression-related obstacles.
Oh I know, I was replying to running 26 psi on it.
Old 01-23-2011, 09:24 PM
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Tell y'all what though. If the pure E85 capability comes about, that'll be fantastic for this application. If you're increasing effective compression by upping the boost a lot, then that would be prime territory for a higher octane fuel such as E85. 105 for E85!

The problem is figuring out how to work around the DI injection window using HPFP pressures within reason (such as a max of 2,800 psi) when you're not only increasing the amount of fuel needed for a stoich mix at any point in time, but also increasing it again by going with a bigger turbo and flowing more air that you're needing to match with fuel.
Old 01-23-2011, 09:28 PM
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There is like 5 or 6 E85 fuel pumps, but they are all 1 hr away, one way.

So I would be running 93 Octane only, unless I went to the drag strip and bought race gas.

I would love to run E85
Old 01-23-2011, 09:31 PM
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Originally Posted by cubaniche
Thats the idea for the Stage 1. Everything is retained on the stock unit except for the internals of course
How long and what does it take to remove the turbo and replace it?
Old 01-23-2011, 09:38 PM
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We need bigger injectors to run E85 even on the stock turbo at 24 psi, I ran out of fuel at 2800 psi in the upper midrange & popped a low fuel rail pressure CEL several times. Since then I repaired the missing injector seal on #3 so perhaps I'll have better luck.

60% Ethanol (2:1 E85 to E10) is about the best I can run reliably & start in the cold weather now. Once it warms up I'll play with straight E85 again.
Old 01-23-2011, 11:20 PM
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Originally Posted by HHRSSouth
I would rather take a hit in hp if it meant I wasn't just blowing hot air with minimal gains over running a lower psi.
I see 32-40 degrees at the lat2 sensor. 50/50 meth/water works good. and this is in az when it was 100 outside. Also if i recall this right BNR told me they got around 390 hp to the wheels on a kappa.
Old 01-23-2011, 11:39 PM
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Originally Posted by hunter19707
How long and what does it take to remove the turbo and replace it?
There is no real how-to but the general consensus is unbolting the dp, then unbolting the turbo and removing it all from underneath the car rather than the top. You'd have to have some mechanical knowledge and experience with tools or know someone willing to help you out. It's a bit technical, yes, but totally doable
Old 01-24-2011, 12:00 AM
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Originally Posted by cubaniche
There is no real how-to but the general consensus is unbolting the dp, then unbolting the turbo and removing it all from underneath the car rather than the top. You'd have to have some mechanical knowledge and experience with tools or know someone willing to help you out. It's a bit technical, yes, but totally doable
Yeah, I can turn a wrench. I have done all the mods on my car thus far. Just wondering if there is anything else I may need to know to do the swap.
Old 01-24-2011, 02:28 AM
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this thread needs more vidz
Old 01-24-2011, 08:26 AM
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Originally Posted by Iam Broke
We need bigger injectors to run E85 even on the stock turbo at 24 psi, I ran out of fuel at 2800 psi in the upper midrange & popped a low fuel rail pressure CEL several times. Since then I repaired the missing injector seal on #3 so perhaps I'll have better luck.

60% Ethanol (2:1 E85 to E10) is about the best I can run reliably & start in the cold weather now. Once it warms up I'll play with straight E85 again.

A guy with LNF sky, running trifecta tune (2800psi) with gt3582r, also popped a low fuel rail pressure CEL several times before. He changed the stock fuel pump to 255lph walbro.......and he never had that low fuel rail pressure CEL again.

He is not running E85 though....just regular pump gas
Old 01-24-2011, 08:27 AM
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I'll also probably running a GT2871r around 20-22psi
Old 01-24-2011, 08:45 AM
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Originally Posted by elecblue06
this thread needs more vidz
I wil take a video next time we data log
Old 01-24-2011, 09:04 AM
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Originally Posted by SKY888
A guy with LNF sky, running trifecta tune (2800psi) with gt3582r, also popped a low fuel rail pressure CEL several times before. He changed the stock fuel pump to 255lph walbro.......and he never had that low fuel rail pressure CEL again.

He is not running E85 though....just regular pump gas
The intank pump?
Old 01-24-2011, 09:25 AM
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E is in the car

Taking it well thus far, we'll find out soon enough what the fuel limit is Im sure lol. Took 15% adjustment on the initial update, we'll see what the next couple do as the mixed gas settles in.
Old 01-24-2011, 09:30 AM
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E85 Stations

AFDC Ethanol: E85 Fueling Station Locations
Old 01-24-2011, 11:27 AM
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Hey I got 2 close.
Old 01-24-2011, 02:05 PM
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Originally Posted by bamaboy22
Hey I got 2 close.
Yep, but I'll be damn if I'm driving a hr away one way for E.
Old 01-24-2011, 02:44 PM
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I wonder if BNR could to the direct bolt up GT30r like BTF was doing? if they could i wonder if they could do the new GTX series wheels in the turbo... Id be very interested in this!


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