i currently have a s366 and love the turbo! i want to make a little more power instead of turning up the boost on the 366. i like 21lbs and dont want more. so i was thinking of the s372..
they come in a .90 as there smallest and 1.25 as there biggest.

what do you guys think i should get? i currnetly have a .91ar.
the car is a street car and see's the track once in a while..
i love my current spool.. so i was thinking the .90 a/r rather than the 1.00
suggestions?

 

I believe that s372 is not BW but Bullseyes product. It has bigger turbine than s366 and of course bigger compressor what means more lag, no if or but. Even with smallest housing it will be laggier than s366 especially since you limit yourself to same boost. I´m pretty sure that S366 is operating well in its efficiency and is not choked on turbine so fitting of bigger unit won´t produce more power, just lag and less powerband....

 

so your suggesting for me to move to a bigger hot side on my current s366? or what is your suggestion?
thank you

 

Keep what you have, you are at the point where fitting bigger hotside would do nothing positive. If you want more power - I mean noticable amount, there is only way how to do it - boost.

 

my motor is theroeticlly dowel pinned and oversized bolts too... im just on the shaky side on pushing more boost lol
any input ?

 

Where are you seeing full boost with the s366?

 

I would say somewhere around 4200ish. Dont remember exactly

 

You are fine. Turn the boost up...

 

come on 5 more psi, how much power are making at 21 psi?

 

Another vote for turning up the boost. You'll waste money going with the 372 (42r equivalent)...

 

More boost if you have the fuel to back it up with

 

on old setup i made 476 on 20 lbs... i blew an apex seal .
now i am dowel pinned and over sized bolts goopy seals and all else new oem
i should make way more compression theoretically then i did... well better compression i guess.
i want to be in the 550 range or close to it.

 

What did your spark plug holes look like when you took the motor apart? Did they have cracking at the holes and LARGE black combustion marks of the like?

 

no they just looked blackish from running a bit rich.. i just picked up the motor from goopy performance and will be putting it back together today.

 

Those blackish marks are not from running pig rich...

 

what is it exactly from.

 

I would suggest moving the boost up a bit to see where it puts you. That turbo should theoretically make 560-600whp at the max, so 24-25psi will be within the normal operating range.