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Custom Rat Rod Twin Turbo Setup

Old 03-31-2013, 07:36 AM
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Join Date: Mar 2013
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Default Custom Rat Rod Twin Turbo Setup

Hey guys,

I added an ebay twin turbo setup to my old truck and am showing zero boost until 6500 - 7000 rpms. Which is over revving my engine.

The turbos are mainly for looks, but I'd like to have something. Having small turbos I would have thought they would have spooled well before 6500-7000k.

Engine: 350 sbc
Wastegates: 38mm, 8psi springs, they don't even open up
Blow off valves: Not doing anything


Trim: 55
A/R: .50
Inducer: 50.50
Exducer: 76.00

Trim: 73
A/R: .63
Inducer: 65.50
Exducer: 55.90

Besides sounded good, they aren't do anything.
kauffjd3 is offline  
Old 03-31-2013, 07:43 AM
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pics. I don't have any newer pics, but I have the exhaust down pipes on now. Turbos are spinning pretty quick. I can take a video if needed.
Attached Thumbnails Custom Rat Rod Twin Turbo Setup-img_20130302_015114.jpg   Custom Rat Rod Twin Turbo Setup-img_20130303_175130.jpg  
kauffjd3 is offline  
Old 04-01-2013, 08:15 AM
Join Date: Feb 2012
Posts: 390

I'd check for boost leaks first.
Matt Cramer is offline  
Old 05-15-2013, 08:48 AM
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Location: In a house.
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So wait, your saying they boost very fast, as in you can hear them spinning, but your not feeling or getting useable boost untill very high rpm?

I dont see much room for boost leaks from the picture, BUT there is never a good reason to not check for those first.

I would think as well that even those those are not *small turbos, they should be a bit quicker. But that does have alot to do with exhaust temps and flow. What is the brand of turbos your using?
sleepy 7 bolt is offline  
Old 05-15-2013, 07:48 PM
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Should be boosting by 5000rpm with 50mm turbos. Are you sure the wastegates are not leaking?
V8KILR is offline  
Old 07-07-2013, 01:01 PM
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Could it be that the wastegate collars are installed upside down....or not at all.....?, leaking exhaust pressure that should be spooling the turbo...
Mangler is offline  
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