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Old 06-07-2010, 03:07 PM   #1
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big turbo vs little turbo.

Okay, just trying to think outloud here.

So Big turbo vs small turbo power.

assuming 1 psi is equal to 10 hp or so would this be the same for big and small turbos. just at different rpm?

eg : -small turbo 10 psi.
-zetec 130 stock
- 230 crank hp ? with power dropping off at 6k or so?

eg 2: - big turbo 10 psi
-zetec 130 hp stock
- WOuld this still me 230 crank hp? but bring power through till redline?

The only thing im confused on is if 10 psi from the small turbo is going to make the same hp as the 10 psi on the bigger turbo.


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Old 06-07-2010, 03:21 PM   #2
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Your very close with your thinking , A small turbo will spool up faster vs slower with a big turbo , I am not a big fan of a fast spooling turbo , its a combination that your looking for and many things need to be looked at

small = 10psi
Big = 10-12 psi

Again all depends on thee combination and the turbo

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Old 06-07-2010, 03:23 PM   #3
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okay, So if i were to run 12 psi with any turbo on my stock zetec, It should put me right around 250 crank hp?
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Old 06-07-2010, 03:46 PM   #4
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Or in my case my bigger turbo is making 13.75 whp per psi
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Old 06-07-2010, 03:48 PM   #5
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He has a stock engine and doesnt need a turbo for 500hp so wouldnt need to go that big

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Old 06-07-2010, 04:11 PM   #6
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Sadly i have a turbo that will support 500 crank hp, But after my 42/48 turbo i always told myself im going alot bigger. because on my poor flowing 1.9 escort i was running out of turbo at about 4800 rpm. with the better flowing zetec i want a stong turbo that would pull to redline. Im willing to comprimise a little bit of lag.

its a t3/t4 54 trim with .63 exh side. Go big or go home :)
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Old 06-07-2010, 06:05 PM   #7
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doubt a 54/63 will get you to 400 let alone 500 , thats why it was falling off on the top doubt it can move enough air to maintain higher rpm boost

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Old 06-07-2010, 06:45 PM   #8
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so what do you think i can expect out of my garrett t3/t4 57 trim? its a .60 A/R on the compressor and a .63 in the hot side. and I plan on trying to rebuild it myself but I want to have it sent of for balancing cause I dont wanna risk it.
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Old 06-07-2010, 06:49 PM   #9
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57 trim is good to about 400whp. Tim (Turbo Turtle) got a 50 trim to 353whp (with the Roush manifold).
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Old 06-07-2010, 06:59 PM   #10
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i know your going to hate me because its SPA but this is what i have

Specifications:
Suggested application: 1.6L - 2.5L engines
Turbine Housing: free float
Single:A/R .36, A/R .48, A/R .63 / T3 flange with a 4-bolt downpipe flange
Compressor Housing: A/R .50 please see technical drawing
Notes: good up to 500 HP
Average weight: 9.0 Kg / 19.73 lbs
Compressor TRIM:50
Turbine TRIM: 73

http://focus.c-f-m.com/spaturbo5000-...bocharger.aspx
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