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Old 08-15-2008, 07:38 PM   #26
Defiant Autospeed
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That would be tough to get, as for it to REALLY be a real worthwhile comparison, it would have to be the same car, on the same dyno. But its been well documented that up to about 100 octane (slightly higher, but 100 is the rule of thumb) produces gains.
Anyone that questions it, needs to try it some time. Then go read my "if someone posts a question, should you answer it" thread

Basically if they say it does nothing, then they almost 100% chance have no firsthand experience with it. That or they are expecting WAY more than it will give. If you are expecting HUGE power, you will obviously be dissapointed.

But its simple black and white stuff. Run a car on 93 pump (even 94) and datalog the ignition advance multiplier. It wont be maxed out. Now run that same car on 100 octane, and datalog it, and see how much more timing you are getting. More timing=more power (to a point, and in this case, you can say that timing=power)

The gains are definately a lot bigger if you tune for the 100 though.
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Last edited by Defiant Autospeed; 08-15-2008 at 07:47 PM.
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Old 08-16-2008, 12:35 AM   #27
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Quote:
Originally Posted by CynicX View Post
....

Oh and I recommend Unabomber taking all of this information, putting his name on it, placing it in the manifesto and deleting this thread... jk...Good work Davenow...


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Old 08-16-2008, 01:56 AM   #28
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Nice job! It's already taught me a few tings I didn't know before.
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Old 08-16-2008, 10:25 AM   #29
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Saturday is a BUSY day for me, likely no updates today.

But more updates will be coming
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Old 08-16-2008, 11:09 AM   #30
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can you tell me if PE510cc's are the same as sti pink 565cc's?
what injector size is recommended for a big 18g with upgraded top mount and stage 2 on a 2.0?
ez
jake
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Old 08-16-2008, 11:50 AM   #31
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They arent the same.
650s would be fine, 750s would give you more headroom.

And I recommend Deatschwerks over all of them

Sorry for being so breif, Im swamped right now.
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Old 08-16-2008, 03:36 PM   #32
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Good info, I didn't know about the ocatane thing myself.

I think one topic that is a must for the thread is the OL / CL topic aka "Which cars can run downpipes safely without tunes?" etc... I see this question in here almost every day in some form or fashion.
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Old 08-17-2008, 02:47 PM   #33
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02-03 WRX
04 STI
05 STI

Beyond that, EM is a must. Even then, you will see BIG benefits from a good tune.

I will add it in in a bit
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Old 08-17-2008, 05:11 PM   #34
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answered my question. so 510's won't support the big 18g how bout a big 16g?
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Old 08-17-2008, 05:27 PM   #35
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Pinks are 565 and barely support a normal 16G if you run a good amount of boost.

FYI a "big 16G" is only a hair smaller than an 18G.

16G=35lb compressor wheel
big 16G=37lb compressor wheel
EVOIII 16G=39lb compressor wheel

18G=40lb compressor wheel. No such thing as a big or small 18G. Just proper 18G in the larger compressor housing, and a cheap garbage 18G in the small compressor housing. Both use the same compressor wheel.


On the big 16G, my advice would be dont bother with it. Either do a normal 16G, or do an EVOIII 16G. The "big 16G" doesnt get you much more power, but it does get you less than the EVOIII. Basically a big 16G wont make power you will really see on a dyno over the normal 16G, but the EVOIII will make a good bit more.
Why am I not saying skip that for an 18G if they are only 1lb apart? Because the EVOIII16G has long been established as an AWESOME turbo for a 2.0L Its pretty much the ultimate street turbo for a 2.0L. On the 2.5L the 18G is the smallest to do really.
Its not just the compressor wheel, there is a little more to it, efficiency and such for the motor size. The EVOIII16G uses the small compressor housing, and while I think that wheel would probably work better in the larger compressor housing, it has proven itself in the current configuration over and over when it comes to performing on the 2.0L motors.

Last edited by Defiant Autospeed; 08-17-2008 at 05:35 PM.
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Old 08-17-2008, 07:19 PM   #36
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you have become a friend request
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Old 08-17-2008, 07:35 PM   #37
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Very nice! You managed to cover a lot of basic info.
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Old 08-17-2008, 10:10 PM   #38
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great great great write-up!

nice job sir!
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Old 08-17-2008, 10:55 PM   #39
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I'm pretty sure the OEM up pipes don't have a flex section in them. If I read correctly, that's what you were trying to say.
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Old 08-17-2008, 11:03 PM   #40
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Quote:
Originally Posted by hypoxvi View Post
I'm pretty sure the OEM up pipes don't have a flex section in them. If I read correctly, that's what you were trying to say.
Umm... No. They do have a flex section.
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Old 08-19-2008, 08:31 AM   #41
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I think this needs to be addressed: TD04 on 06-07 WRX's DO NOT creep, they spike, big difference.
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Old 08-19-2008, 09:10 AM   #42
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Quote:
Originally Posted by cucamelsmd15 View Post
I think this needs to be addressed: TD04 on 06-07 WRX's DO NOT creep, they spike, big difference.
They also gag cough and wheeze on a motor about 2x too big for them
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Old 08-19-2008, 09:11 AM   #43
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Quote:
Originally Posted by hypoxvi View Post
I'm pretty sure the OEM up pipes don't have a flex section in them. If I read correctly, that's what you were trying to say.
They do. Its there, and its aweful.
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Old 08-19-2008, 09:29 AM   #44
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Quote:
Originally Posted by Defiant Autospeed View Post
They also gag cough and wheeze on a motor about 2x too big for them
Well, yeah, of course.
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Old 08-19-2008, 09:48 AM   #45
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I am thinking I am going to add something about what size injector for what setup. That will have to be a "guidelines" type thing, since there is a bit of a range, but at least it may help some people decide.
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Old 08-19-2008, 11:59 AM   #46
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Please Do.
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Old 08-19-2008, 12:19 PM   #47
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Couldn't have done better, this is an awesome write up for the nubes.
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Old 08-21-2008, 04:05 PM   #48
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Still working on getting a minute to update it..
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Old 08-21-2008, 04:08 PM   #49
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thanks guys
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Old 08-21-2008, 04:18 PM   #50
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So if I drive up to the local Sunoco 100 octane pump and drop a c-note, I can expect 10-15 more whp? What about on track? Is this safe on a stock motor?
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