22-01-2016, 10:29 AM
Nothing to do with whether you'll be lifting the cylinder head, I'd be significantly more concerned about exploding the turbo!
![[Image: GT2052-48-C.jpg]](http://www.theboombopshop.com/v/vspfiles/photos/garrett/GT2052-48-C.jpg)
Using: https://www.rbracing-rsr.com/calcboost.html
185hp, 17.5:1 AFR, .44 (being nice!) BSFC, 150*F Post IC, 88% VE, 4000RPM, 122ci (2.0 litres) = 28.44psi Boost required, 23.74lb/min airflow.
Both off the ends of the compressor map, you're into unchartered territory, so basically you're now hoping the turbo is nice and strong to deal with probably higher than rated shaft speed and will be blowing hot-ish air.
OFC you can tune these to lower than 17.5:1, which is where you'll claw it back, but you want to be watching EGTs if so. The above figures are "safe" almost "OEM" settings, so I'm being conservative...
IMHO it's often not worth putting ARPs in unless you've got the engine in pieces anyway... If the engine is in bits, yes do it, if it's together, wait and see if you get problems, not worth the expense... Replacing one at a time is more likely to disturb the gasket too, so you'll be wondering if it did have issues 'was it because I swapped them one at a time?'
Using: https://www.rbracing-rsr.com/calcboost.html
185hp, 17.5:1 AFR, .44 (being nice!) BSFC, 150*F Post IC, 88% VE, 4000RPM, 122ci (2.0 litres) = 28.44psi Boost required, 23.74lb/min airflow.
Both off the ends of the compressor map, you're into unchartered territory, so basically you're now hoping the turbo is nice and strong to deal with probably higher than rated shaft speed and will be blowing hot-ish air.
OFC you can tune these to lower than 17.5:1, which is where you'll claw it back, but you want to be watching EGTs if so. The above figures are "safe" almost "OEM" settings, so I'm being conservative...
IMHO it's often not worth putting ARPs in unless you've got the engine in pieces anyway... If the engine is in bits, yes do it, if it's together, wait and see if you get problems, not worth the expense... Replacing one at a time is more likely to disturb the gasket too, so you'll be wondering if it did have issues 'was it because I swapped them one at a time?'
