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post #1 of 8 (permalink) Old 09-29-2011, 02:10 PM Thread Starter
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S474 or smaller

I have industrials twin kit with an S474 as the big turbo. It seems like it is a little slow to light. It really won't light until about 2200 rpm and with my tire size and gearing, that speed is about 80 mph. I am running elites 185s. Would it be benificial to downsize turbos to say an S471. Thanks for any advice.
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post #2 of 8 (permalink) Old 09-29-2011, 03:59 PM
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Re: S474 or smaller

What is the specs on the small turbo? The big turbo will only be driven as hard as the small one is pushing it. Chances are you need to drop down in size on the secondary (smaller) turbo to get quicker spoolup across the board to drive the atmosphere (big) turbo quicker

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post #3 of 8 (permalink) Old 09-29-2011, 04:47 PM
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Re: S474 or smaller

Powerstrokejunkie is right

Not sure if you have Industrials tow or race compounds but seeing you have the s474 ill assume you have the towing setup, which secondary do you have the 62/70 or the 62/80?

If you have the 62/80 the spoolup will be a good deal slower than the tigher .70 housing put a bd diverter valve to help spoolup of the 62/80..

The primary will only light if the secondary is lit...
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post #4 of 8 (permalink) Old 09-29-2011, 06:26 PM Thread Starter
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Re: S474 or smaller

I do have the 62/70 and it lights well enough. For example, cruising down the road at say 70 mph and 2k rpm with little load, I will build about 7 or 8 psi and be smokey at near or over a 1000 degrees. Now pick up the rpm another couple hundred, you can hear the big turbo light, and clear the smoke and still only be building 7 or 8 psi with close to a 800 degree temp. Hope that helps. Thanks for the input
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post #5 of 8 (permalink) Old 09-30-2011, 11:33 AM
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Re: S474 or smaller

Id say you have a exhaust or boost leak somewhere.

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post #6 of 8 (permalink) Old 09-30-2011, 12:49 PM
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Re: S474 or smaller

I was thinkin the same thing. Those II twin kits have been known to have leaks. I've heard it mentioned already from guys who have had them. Leaks from the poor weld job and nothing lining up the way it should.

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post #7 of 8 (permalink) Old 09-30-2011, 01:47 PM Thread Starter
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Re: S474 or smaller

I am one of the people that has been talking about the leaks. I have fixed multiple leaks, exhaust and oil drains. I do not have any oil or exhaust leaks now or boost for that matter. I do have 185 injectors though. I will attempt to change some tuning and see what happens. It was way different when I had the tow tune in it. Of course since then, I have had the turbos off about five times. I will figure it out. Thanks for the feedback.
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post #8 of 8 (permalink) Old 09-30-2011, 01:58 PM
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Re: S474 or smaller

Industrial injection ftw

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