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Old 04-10-2008, 10:21 AM   #1
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turbos

ok i am going to start this thread. i havent seen one like it yet and i think it could be helpful when it comes to people wanting to make high power on a focus and which turbo you should choose.

what i would like to see and im sure many other will be.

turbo type with specs.
other mods and restrictions that will help/hurt the power/spool of the turbo. (besides it being a focus engine, lol)

also i would like to keep this down to the bigger turbo's and power levels above 300whp because less than that is easy to make.

also please post dyno sheets. not just power levels. we all want to SEE spool and how well it held the power, lol


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Old 04-10-2008, 10:24 AM   #2
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i will start.

t3/to4e .50 trim .63ar 360 thrust and journal bearing

some other restrictions: log style manifold, small intercooler, stock intake manfold
some other mods for +/- spool: fp head, turbo cams, 9-1 compression, cam gears were no help
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Last edited by 03OrangeSVT; 04-10-2008 at 11:47 AM. Reason: needed url info to add to dyno thread
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Old 04-10-2008, 08:40 PM   #3
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good thread.


Some things that will help top-end:
larger exhaust piping
no cat / test pipe / off road pipe
tubular, equal length headers
larger core intercooler
larger ar
aggressive cams
meth injection
nitrous


some things that will help spool:
smaller exhaust
smaller ar
twin scroll mani
ball bearing turbo
catalytic conv
milder cams
nitrous
meth injection
stroker kit

I know there's more, it's been a long day.
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Old 04-11-2008, 04:49 PM   #4
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How does having a smaller exhaust help with spool? Lower Restriction=Faster Spool?
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Old 04-11-2008, 05:07 PM   #5
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Actually thats sorta mis-leading.

the smaller ar on the exhaust side of a turbo will make it hit full boost sooner BUT it also causes the power to "drop off" ... as in start loosing power in the higher rpms.

The smaller ar is a restriction and it can cause the turbo to reach a state of equalibrium... where the turbos output (boost) is equal to its input (exhaust pressure) and when you reach that state no matter how much more boost you add the engine will NOT make anymore power.
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Old 04-11-2008, 09:22 PM   #6
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Quote:
Originally Posted by Cajun Boy876 View Post
How does having a smaller exhaust help with spool? Lower Restriction=Faster Spool?
It is more of a restriction and helps spool a little.
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Old 04-11-2008, 09:27 PM   #7
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Quote:
Originally Posted by 03OrangeSVT View Post
Actually thats sorta mis-leading.

the smaller ar on the exhaust side of a turbo will make it hit full boost sooner BUT it also causes the power to "drop off" ... as in start loosing power in the higher rpms.

True, there is always a trade off. Thats why I put 2 columns. One for increasing spool, and one for more top end.

The smaller ar is a restriction and it can cause the turbo to reach a state of equalibrium... where the turbos output (boost) is equal to its input (exhaust pressure) and when you reach that state no matter how much more boost you add the engine will NOT make anymore power.

True, again. You don't wanna go any smaller on a 50 trim. But the larger turbos can go a bit smaller.

Also, something to note, if going with a twin scroll set-up, you can run a much larger ar and reap the benefits of quicker spool from the twin scroll housing. Here's the but, but twin scroll set-ups have not produced as much power as there single scroll counterparts.
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Old 04-11-2008, 09:42 PM   #8
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How do exhaust restrictions help spool? That seems counter-intuitive.
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