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Old 08-01-2011, 03:39 AM   #1
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Default So I feel like I'm spooling slow - GT2860RS

I'm pretty sure the car spools way too slowly. I usually don't get to full boost (12.5 LBS) until 5k. Is this normal for my setup?

GT2860RS
BEGI S4 with big intercooler
FM exhaust with high flow cat


What should I expect? I'm petty noobish about the factors that come into play when it comes to spooling. Fill me in?
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Old 08-01-2011, 04:03 AM   #2
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You're going to have to post way more details than that. What engine, boost control, etc.

But 5k is still too slow. Any exhaust leaks? Boost leaks?

Something is wrong.
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Old 08-01-2011, 07:38 AM   #3
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I"d say check for boost leaks, broken couplers, ripped vacuum plugs, etc
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Old 08-01-2011, 03:15 PM   #4
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Manual boost controller. I have a TurboSmart eboost2 controller but i'm not using it.

I have an exhaust leak but not pre turbo? Does this cause issues related to spool?

Its a 2002 1.8 stock head and bottom end. I don't think i have a boost leak because my vac is at about 18-19 and my boost doesn't fall off at all once it's spooled.

Any other info that might help you guys help me? Let me know, thanks.
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Old 08-01-2011, 03:21 PM   #5
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.86 or .64 A/R turbine housing?

Where is the leak. If it's at the turbo->DP, this is a huge problem.
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Old 08-01-2011, 03:35 PM   #6
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A bleeder type MBC doesn't help spool any. Ball and spring will rise faster. EBC is bestest, imho.

As stated, vacuum leaks are a good place to start.
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Old 08-01-2011, 05:35 PM   #7
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Quote:
Originally Posted by Dem768 View Post
Manual boost controller. I have a TurboSmart eboost2 controller but i'm not using it.

I have an exhaust leak but not pre turbo? Does this cause issues related to spool?

Its a 2002 1.8 stock head and bottom end. I don't think i have a boost leak because my vac is at about 18-19 and my boost doesn't fall off at all once it's spooled.

Any other info that might help you guys help me? Let me know, thanks.

What is your EMS? Are you controlling VVT? I ask because if you screw up somehow and advance the cam all the time, you will spool VERY late.

I also recommend checking all your charge piping, upper/lower intake manifold bolts, and also your S4-turbo bolts.
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Old 08-01-2011, 06:28 PM   #8
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you can have plenty of air leaks that can kill spool
Also I had same amount of vacuum at idle 29-31kpa with pre tb leaks and boost wouldn't fall off either, it would just take forever to build up.

with leaks at max boost setting on my MBC I was hitting 200kpa, after leaks pluged not even close to max out on it I'm hitting 220kpa+
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Old 08-01-2011, 08:04 PM   #9
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Quote:
Originally Posted by Dem768 View Post
Manual boost controller. I have a TurboSmart eboost2 controller but i'm not using it.

I have an exhaust leak but not pre turbo? Does this cause issues related to spool?

Its a 2002 1.8 stock head and bottom end. I don't think i have a boost leak because my vac is at about 18-19 and my boost doesn't fall off at all once it's spooled.

Any other info that might help you guys help me? Let me know, thanks.
Pre throttle body boost leaks won't show on a vacuum gauge.
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Old 08-01-2011, 09:35 PM   #10
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charge pipe size? intercooler dimensions?
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Old 08-01-2011, 09:44 PM   #11
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Eight inch.
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Old 08-01-2011, 10:06 PM   #12
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Alright so I shot a video. I'm using the turbo XS manual boost controller. Standard BEGI s4 piping. It changes size a couple of times. The intercooler is their number two option - a 65$ upgrade when purchasing the kit. Here is a the clip of 3rd gear full throttle.

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Old 08-01-2011, 10:14 PM   #13
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You have 5sp or 6sp?
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Old 08-01-2011, 10:21 PM   #14
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5spd
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Old 08-02-2011, 12:14 PM   #15
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Anything after watching the video? This probably isn't normal. If so, I'd rather have a smaller turbo and be able to use it.
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Old 08-02-2011, 12:18 PM   #16
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why too slow of boost, even with a .86.
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Old 08-02-2011, 12:44 PM   #17
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Quote:
Originally Posted by Braineack View Post
why too slow of boost, even with a .86.
I thought so too. I'll start with connecting my TurboSmart controller.

Any other thoughts? It's probably not the boost controller.
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Old 08-02-2011, 12:49 PM   #18
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how does it spool with just a line to the wastegate?
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Old 08-02-2011, 01:10 PM   #19
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I just wanted to be the 7th person to suggest that it's most likely a boost leak. As stated previously, a leak between the turbo and throttle body will not affect idle or drop off boost at high rpms.

When I first turbocharged my car I made the exact same thread, everyone said it was a boost leak so I pressure tested the charge piping. My blow off valve (that came with the BEGI kit) was leaking quite a bit of air. I swapped it out and the problem was gone.
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Old 08-02-2011, 01:19 PM   #20
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I'll be the 8th.
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