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Old 09-01-2015, 08:59 PM   #1 (permalink)
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Default slow spool troubleshoot

Alright so while on the dyno today the tuner found a couple of problems. First off the turbo is spooling ridiculous slow gtx3076r. Like 15lbs at 4500rpm. He said it could be the wrong sized housing sent with the turbo (.63) or a significant leak on the ic piping. I haven't had time to dig into it yet, all I did was take a look at the turbine housing and wheel.I can fit an .011 feeler gauge between the turbine housing and the wheel fin. Secondly I have some serious boost creep. I have a 10lb spring in and it creeps up to 20 psi. I think I have to small of a wastegate. Ill list all the parts at the end. Please just throw all of your guesses at me and sorry if I forgot some things

450-500hp goal
D16z6
Fully built and sleeves
Stock compression
Comp59300
Gtx3076r
3in dp
Tial 38mm mvsa
S300
Turbo screen no filter
Blitz bov
Custom top mount manifold
Ge intake manifold
93 pump gas
Water meth inj
2.5in hot and cold side pipes
Precision 600hp ic
Id 1000s
Areomtive 340lph
Head is not port and polished
The iacv does not have the coolant lines hooked up for some reason (a shop did the work)

Please ask me, if there's anything I forgot


330hp at 25psi (he says it should be much higher)
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Old 09-01-2015, 09:17 PM   #2 (permalink)
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15psi at 4500 is pretty good for a 3076R, .63AR is a good size for a street/strip D series car.

Post dyno chart and pics of engine bay. Will help us see exactly how it spools, and see manifold design to understand your creep problem.

You need like a 62mm+ turbo to make 500whp on a D series, and it's gonna be at like 30psi, and you're gonna need race gas.
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Old 09-02-2015, 05:44 AM   #3 (permalink)
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That sounds about right for that turbo on a 1.6L
You should have gone with the 3071, the 3076 is pretty well known for be a slow spooler.

Or better yet, you should have gotten an EFR 6758. The EFR turbos are the hot ticket right now, proven to out-spool the Garrett units of similar size.
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Old 09-03-2015, 05:54 AM   #4 (permalink)
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My $.02...

I'd be more concerned over the fact that it isnt making any power. Check the mechanical timing of the motor to make sure it isnt out.
The "spool time" isnt abnormal IMO, that is going to vary slightly car to car, setup to setup. You can check for pre turbo boost leaks. What is the compression of the motor?

A .63 a/r turbine housing is perfectly fine; in fact, I wouldnt use anything any smaller on a 3076.

You do not need a larger turbo to make 500whp on a D series.
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Old 09-03-2015, 06:34 AM   #5 (permalink)
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What Im struggling to understand is why OP would tell us what kind of BOV he has, but doesnt post his dyno... or his tune... or a datalog...
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Old 09-03-2015, 08:54 AM   #6 (permalink)
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^my guess would be he thinks its something in the combination of parts that is wrong. With the little info given, I'd say its something in the "operation" thats wrong.
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Old 09-04-2015, 11:33 AM   #7 (permalink)
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Quote:
Originally Posted by Full_Tilt View Post
What Im struggling to understand is why OP would tell us what kind of BOV he has, but doesnt post his dyno... or his tune... or a datalog...
I will have all of this for you tonight
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Old 09-04-2015, 12:43 PM   #8 (permalink)
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Sounds good.

A datalog in 3rd gear, starting at really low RPM would be awesome.
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Old 09-04-2015, 03:43 PM   #9 (permalink)
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Spool time seems to be right on. However, you're making very little power for that turbo and boost level. Correct me if I'm wrong, but large diameter/long runners on a top mount aren't exactly going to be the best thing for fast spool either. You want a manifold that will keep exhaust velocity high. Again, your spool time doesn't seem bad at all for that turbo.

FWIW, I rock a 38mm wastegate with a rather light spring on my y8 making 450whp and experience no boost creep. That's running dual maps at 21lbs and 27lbs.
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Old 09-04-2015, 05:57 PM   #10 (permalink)
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Sorry guys my plans got changed and I wasn't able to do a datalog. I have a pic of the engine bay and dyno graph, I'll post them as soon as I get home
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Old 09-04-2015, 09:44 PM   #11 (permalink)
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Are you home yet?
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Old 09-05-2015, 09:44 AM   #12 (permalink)
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I would also like to see some pictures of the setup.
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