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Author Topic: Slow Spool, too rich?  (Read 7402 times)

MAJORAHOLE

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Slow Spool, too rich?
« on: April 22, 2010, 12:57:06 PM »
my spool time is shitty, z6, ebay 16g, 9psi @ 5000rpm
my tune is rich in boost, maybe just getting into pressure too
i might have an exhaust leak, but i know its not before the turbo(ive checked a few times)
im pretty sure theres no boost leaks either.
so could a tune thats too rich during spool cause slow spool??
any other ideas welcome too.

btw, my wastegate sticks open for a second at full boost (10psi), just for a sec tho
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d112crzy

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Re: Slow Spool, too rich?
« Reply #1 on: April 22, 2010, 01:08:10 PM »
retard timing as it goes into boost.
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MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #2 on: April 22, 2010, 04:09:03 PM »
i'll giva that a try, gonna run some seafoam through it tonight to make sure no exhaust leaks
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bigwig

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Re: Slow Spool, too rich?
« Reply #3 on: April 22, 2010, 04:12:13 PM »
Could be the turbo.  Could be an exhaust leak.  Could be a boost leak.  Could be the tune.  Those are the 4 I would start off with.

Can I ask, why buy an eBay 16g?  I mean seriously, Evo8 turbos are $200.
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MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #4 on: April 22, 2010, 04:17:16 PM »
i bought it last year, i never saw any evo 8 turbos for $200 then. havent looked lately

i figured if the seals or bearings go, then i could have it rebuilt with non-china internals
« Last Edit: April 22, 2010, 04:19:43 PM by MAJORAHOLE »
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HiProfile

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Re: Slow Spool, too rich?
« Reply #5 on: April 25, 2010, 10:47:33 PM »
Exhaust leaking past the WG valve (no firering?) will slow spool.

Exhaust leaking into the engine bay, and into the air filter, will slow spool.

Boost leaking through a tiny hole in a charge pipe or BOV can slow spool.

An ebay turbo eating it's thrust bearing will slow spool.




There are a few other things that slow spool, but to a lesser extent. Retarding timing has little effect, at least retarding past the 'normal' amount for the corresponding boost. Regardless, 3/4 of slow spool problems stem from some sort of leak.
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patsmx5

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Re: Slow Spool, too rich?
« Reply #6 on: April 26, 2010, 12:27:03 AM »
I used to tune my car to run 11:1 from 0-15 PSI boost, and spool sucked bigtime. On my setup, leaning it out to 13.5:1 at 0 PSI boost and tapering to 12:1 by 8 PSI helps spoolup and driveablity a ton. Night and day difference.
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Quote: Originally Posted by Adam Hopkins
There is no such thing as too much boost. You could have too little rod, piston, or sleeve. But never too much boost.

mrgreengenes

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Re: Slow Spool, too rich?
« Reply #7 on: April 26, 2010, 11:34:17 PM »
post turbo exhaust flow problem?  You have a cat?  a partially melted one will plug up the cat exit, making tons of back pressure.

Phil
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MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #8 on: April 27, 2010, 12:23:01 AM »
i do have a stock cat, was thinkin about getting rid of that here soon
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bigwig

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Re: Slow Spool, too rich?
« Reply #9 on: April 27, 2010, 12:32:51 AM »
Quote from: MAJORAHOLE on April 27, 2010, 12:23:01 AM
i do have a stock cat, was thinkin about getting rid of that here soon

ding ding ding.  Get rid of it ASAP.  Buy 2 flanges and a 2' of pipe from HD and get to it.
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MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #10 on: April 27, 2010, 11:25:55 AM »
ya, i will.
im finishing our basement right now, so every time i try to do a little work on my car, my wife gets on my ass about the damn basement.
i do want to get it done though. jsut bought a new projector for it, and want to be able to watch some shit.
also she wont left me buy another xbox till its done either, fuckin bitch...
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Teg2boo

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Re: Slow Spool, too rich?
« Reply #11 on: April 27, 2010, 11:48:49 AM »
On my car I still have the cat, but there is no material into it so it still legal :P But I need to buy a bigger one, this one is only 2.25 I think....

My spool suck too.
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MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #12 on: April 27, 2010, 12:07:06 PM »
luckily we have no emmisions testing, so it should be good
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Teg2boo

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Re: Slow Spool, too rich?
« Reply #13 on: April 27, 2010, 01:27:58 PM »
Quote from: MAJORAHOLE on April 27, 2010, 12:07:06 PM
luckily we have no emmisions testing, so it should be good

Same thing here, they only look if the cat is there. It's like a 300$ fine if you don't have it...
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damn you guys too? its a fucking forum not a court room!
 Its not a forum its a gang.  

MAJORAHOLE

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Re: Slow Spool, too rich?
« Reply #14 on: April 27, 2010, 03:02:58 PM »
ahh, i was thinkin about putting a cherry bomb in its place to quiet it down
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2slow

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Re: Slow Spool, too rich?
« Reply #15 on: April 28, 2010, 09:29:39 PM »
Quote from: MAJORAHOLE on April 27, 2010, 03:02:58 PM
ahh, i was thinkin about putting a cherry bomb in its place to quiet it down
hollow it out for now and see if that at least helps your problem
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