Hey R3v,
I've been working toward turbocharging the car (M20B25) and was hoping for some input on a turbo selection. Goal is drivability and early boost with decent top end. Power goal of around 300-350hp would be sweet, but really anything over my current 170hp would be terrifying. My engine is stock with a re-freshed head (40k miles ago) and ARP head studs, so plan is to run a maximum boost pressure of 15 psi with a stock redline.
I've been looking at BorgWarner's MatchBot to help pick a turbo. I think the AirWerks S200SX-E series are the best suited for my application, besides something from the EFR series which are pretty damn pricey. I'm currently between two turbos that are nearly identical apart from the compressor housing. Here are the selection details from MatchBot:
Borg Warner Turbo S252 S200 SX-E
P/N: 12709095019
T3
70mm turbine wheel, .83 a/r
Compressor: 52.2mm inducer, 70mm exducer
MatchBot reference: https://www.borgwarner.com/go/0J14XG
Borg Warner Turbo S257 S200 SX-E
P/N: 12769095003
T3
70mm turbine wheel, .83 a/r
Compressor: 57.2mm inducer, 76.2mm exducer
MatchBot reference: https://www.borgwarner.com/go/R4IF87
Going off the compressor maps, I'm leaning towards the S252 for better response and mid range. Note that I intentionally set the boost pressure to 17 psi from 5k rpm to 6.5k rpms to make sure I wasn't dangerously close to the choke line for either turbo.
I managed to find both turbo candidates through BorgWarner via Amazon with a very close a/r ratio - .82, that I'm considering going with but wanted a second opinion before pulling the trigger. This is my first attempt at trying to size a turbo and boost in general so I definitely might be missing something. Which turbo would you choose?
Turbo considerations:
https://www.amazon.com/Borg-Warner-T.../dp/B07G9L36J4
https://www.amazon.com/Borg-Warner-T.../dp/B07G9Q1GVN
I've been working toward turbocharging the car (M20B25) and was hoping for some input on a turbo selection. Goal is drivability and early boost with decent top end. Power goal of around 300-350hp would be sweet, but really anything over my current 170hp would be terrifying. My engine is stock with a re-freshed head (40k miles ago) and ARP head studs, so plan is to run a maximum boost pressure of 15 psi with a stock redline.
I've been looking at BorgWarner's MatchBot to help pick a turbo. I think the AirWerks S200SX-E series are the best suited for my application, besides something from the EFR series which are pretty damn pricey. I'm currently between two turbos that are nearly identical apart from the compressor housing. Here are the selection details from MatchBot:
Borg Warner Turbo S252 S200 SX-E
P/N: 12709095019
T3
70mm turbine wheel, .83 a/r
Compressor: 52.2mm inducer, 70mm exducer
MatchBot reference: https://www.borgwarner.com/go/0J14XG
Borg Warner Turbo S257 S200 SX-E
P/N: 12769095003
T3
70mm turbine wheel, .83 a/r
Compressor: 57.2mm inducer, 76.2mm exducer
MatchBot reference: https://www.borgwarner.com/go/R4IF87
Going off the compressor maps, I'm leaning towards the S252 for better response and mid range. Note that I intentionally set the boost pressure to 17 psi from 5k rpm to 6.5k rpms to make sure I wasn't dangerously close to the choke line for either turbo.
I managed to find both turbo candidates through BorgWarner via Amazon with a very close a/r ratio - .82, that I'm considering going with but wanted a second opinion before pulling the trigger. This is my first attempt at trying to size a turbo and boost in general so I definitely might be missing something. Which turbo would you choose?
Turbo considerations:
https://www.amazon.com/Borg-Warner-T.../dp/B07G9L36J4
https://www.amazon.com/Borg-Warner-T.../dp/B07G9Q1GVN
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