reducing spool
09-04-2008, 07:27 PM
#22
the intake sure does. i remember testing with and without my intake assembly (stock subaru intake pipe, cheap cone filter and bypass pipe) and remember the threshold being about 250 rpm lower as well as spool being much faster in the range between 10" Hg vacuum and 2-3 psi boost.
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09-04-2008, 08:26 PM
#23
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ebay cast mani, 2 1/2 inch downpipe doing to a 3 inch exhaust, no cat, 2 inch hot side and 2 1/2 coming out of the intercooler. and the air filter is right on the turbo.
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09-04-2008, 08:27 PM
#24
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Gain 10-25% more power and drop spool 500-1000 RPMs.
http://books.google.com/books?id=283...um=1&ct=result
http://books.google.com/books?id=283...um=1&ct=result
thanks man
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09-04-2008, 08:41 PM
#25
That only has the first few chapters. All the good stuff is not shown. But it's a good read none the less. But all the good info you need to know is not shown. I just bought a copy of that and another book about building short blocks by the same author.
And yesterday you couldn't stop calling me a dumbass or picking over semantics.
And yesterday you couldn't stop calling me a dumbass or picking over semantics.
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09-05-2008, 10:42 AM
#29
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well even with my filter on the turbo, i only see a max of about 130 IAT under full boost.
jason-i have no idea how much power its making, never even touched a dyno.
jason-i have no idea how much power its making, never even touched a dyno.
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09-05-2008, 11:12 AM
#30
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Depending on your peak power, there may be smaller turbos that can give the same peak power, while moving your desired "jet thrust", down from 5000 RPM to 4000 RPM.
You also didn't answer how long you've had a turbo miata.
You also didn't answer how long you've had a turbo miata.
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09-05-2008, 12:51 PM
#31
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09-05-2008, 02:16 PM
#34
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My old setup would make 6psi from 3000 on up to about 4300. At 4300, It would almost instantly go to my boost setting...be it 15psi or 28psi. I had very little lag when I was above boost threshold.
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09-05-2008, 03:37 PM
#37
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Ah, so you're the newbie, dickwad. I've been turbo'ed for 10x longer than you. You just discovered the reason I advocate, for a street car, the smallest turbo that meets your realistic peak power goals. Unless your revs are always above 4500, you'll be caught flatfooted if you need power NOW.
If you do headwork or some other changes to greatly improve spoolup, you will likely spend more than the money you saved on your $100 turbo. Even then the improvements will be less than switching to a smaller a/r housing or smaller turbo.
Sell your turbo to some other sucker who wants "jet thrust" at 5000 RPM and put the money to a smaller T3. Markp's favorite T3 config is good for 300whp and spools close to a '2560.
If you do headwork or some other changes to greatly improve spoolup, you will likely spend more than the money you saved on your $100 turbo. Even then the improvements will be less than switching to a smaller a/r housing or smaller turbo.
Sell your turbo to some other sucker who wants "jet thrust" at 5000 RPM and put the money to a smaller T3. Markp's favorite T3 config is good for 300whp and spools close to a '2560.
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09-05-2008, 03:46 PM
#38
Ah, so you're the newbie, dickwad. I've been turbo'ed for 10x longer than you. You just discovered the reason I advocate, for a street car, the smallest turbo that meets your realistic peak power goals. Unless your revs are always above 4500, you'll be caught flatfooted if you need power NOW.
If you do headwork or some other changes to greatly improve spoolup, you will likely spend more than the money you saved on your $100 turbo. Even then the improvements will be less than switching to a smaller a/r housing or smaller turbo.
Sell your turbo to some other sucker who wants "jet thrust" at 5000 RPM and put the money to a smaller T3. Markp's favorite T3 config is good for 300whp and spools close to a '2560.
If you do headwork or some other changes to greatly improve spoolup, you will likely spend more than the money you saved on your $100 turbo. Even then the improvements will be less than switching to a smaller a/r housing or smaller turbo.
Sell your turbo to some other sucker who wants "jet thrust" at 5000 RPM and put the money to a smaller T3. Markp's favorite T3 config is good for 300whp and spools close to a '2560.
Now I understand a lot of people hate lag. I do too. However, some people hate having a motor with no "top end". I'm one of those guys. I'm gonna put a big t3/t4 on my 99' because I want some top end power. I'll take the lag for the top end power. Granted I'm going for 350whp. Still, there's probably smaller turbo's that will get me there, but I'll pass.
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