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Discussion Starter #1
I am considering upgrading my turbo to a 66mm compressor from the 64mm. I am wondering how much of a spool up difference there would be. 71mm turbine wheel, ported head, lots of fuel and way too much time tuning.
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My silver 66 started spooling at 1700.
 

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i went from a 63/68/12 to a 66/68/14 and there was hardly any difference in spoolup, a small amount but it aint a big deal for me
 

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i went from a 64mm to a billet 66mm wheel, and spool up is the same if not better, i had to tune it all over again, but once i got it right i like it better then the 64mm
 

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Discussion Starter #5
What about in a twins setup? Got an S480 in the shop that might be in my future. Just kickin around the idea i would like to get the current one figured out first.
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i went from a 63/68/12 to a 66/68/14 and there was hardly any difference in spoolup, a small amount but it aint a big deal for me
Where'd you get that 66/68/14?
 

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Discussion Starter #8
Is that a t3 or t4 flange
 

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t3 divided flange wastegated (.80 a/r) hx40 downpipe hookup
 
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Discussion Starter #10
maybe that might just be the ticket
 

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Its a little surgy sometimes, mainly when when the tc locks up in 4th gear, a larger turbine wheel would fix that if it worries you, but I really like this turbo.
 
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