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Old 08-15-2010, 12:46 AM   #1
AR Black
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Question Turbo T3 -- BMW 318ti ( Help)

Ok. I am thinking of buying a Turbo T3 (AR.70 and AR.48 Exhaust)
My question is:
A few would load RPM boost in my 318ti?
Maybe 3000rpm?
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Old 08-15-2010, 03:40 PM   #2
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Originally Posted by AR Black View Post
Ok. I am thinking of buying a Turbo T3 (AR.70 and AR.48 Exhaust)
My question is:
A few would load RPM boost in my 318ti?
Maybe 3000rpm?
Your question is not clear? I think what you are ask is about turbo spool

The exhaust A/R determines spool. I run a .63 A/R and spool around 3,200 rpm. With a .43 A/R you should spool earlier so maybe around 2,600rpm with full boost at 3,000rpm. The spool happens quick and boost hits very hard

The .70 on the compressor wheel determines the maximum boost you can run. I run a .70 A.R which is for big boost. You are running the same compressor A/R so you should be able to boost 25psi or higher
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Old 08-15-2010, 05:39 PM   #3
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Quote:
Originally Posted by xxxJohnBoyxxx View Post
Your question is not clear? I think what you are ask is about turbo spool

The exhaust A/R determines spool. I run a .63 A/R and spool around 3,200 rpm. With a .43 A/R you should spool earlier so maybe around 2,600rpm with full boost at 3,000rpm. The spool happens quick and boost hits very hard

The .70 on the compressor wheel determines the maximum boost you can run. I run a .70 A.R which is for big boost. You are running the same compressor A/R so you should be able to boost 25psi or higher
So my turbo spool around 3000-3500 rpm right?
I do not want a spool too slow.
You advice this turbo for M44?
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Old 08-15-2010, 07:01 PM   #4
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Originally Posted by AR Black View Post
So my turbo spool around 3000-3500 rpm right?
I do not want a spool too slow.
You advice this turbo for M44?
It might spool a little lower than 3000-3500 with a .48 A/R on the exhaust. It should be real close. It's very hard to say but should be close with the big .70 compressor wheel.

John S
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Old 08-15-2010, 07:39 PM   #5
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Originally Posted by xxxJohnBoyxxx View Post
It might spool a little lower than 3000-3500 with a .48 A/R on the exhaust. It should be real close. It's very hard to say but should be close with the big .70 compressor wheel.

John S
great
Thank you!
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