Hey I've been looking to upgrade my current turbo which is a GT2860RS on my S15 and I have a couple of questions.
What's the difference between the ATR28 and then ATR28SS turbos?
Do they flutter well? I'm pretty sure my turbo has an anti-surge housing so it doesn't right now but I kinda miss my stock turbo flutter. Not a deal breaker if it doesn't.
Does the 28 number indicate the frame size, similar to the Garrett GT28 series? My friend told me since I'm tuned to a GT2860RS I can just replace it with a GTX2867R or something without a retune and run it without a problem if I don't change any boost settings but it won't be as efficient as it could be. I'm not sure if this is even true in the first place but I'm wondering if I could do something similar with the ATR28/SS. I would eventually tune it but I'm looking to freshen up the head with a valve springs kit, retainers, new VCT, etc first. I don't drive my car very hard either, I probably hit 5.5k rpm maybe once a twice a week.
Yeah I was thinking of getting the SS1.5 as I’m probably aiming for at least 300kw when I eventually go on E85. Do you have any idea about my last question?