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Originally Posted by sidewaysil80
i just read this entire thread in one sitting and i'm still stumped! i cant decide between the 28rs .86 and the 2871r .64. i had the gt2871r paired with undialed bc cams (this was b4 it was discovered they need adj. cam gears) and it was HORRIBLE laggy. to the point where i downgraded back to an s15 turbo lol. i'm piecing together my new motor build and cant decide which to run... i'm going with tomei cams this time for sure.
obviously the 28rs will spool 15-17psi quicker...but how much faster? and at what efficency? i've read that most of you guys are hitting full boost around 3800 but thats like 19+psi and for a setup that i'd like to keep no more then like 330whp...is the 2871r necessary? i guess i'm just traumatized from my last experience with it LOL
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How laggy was your set up? Which trim do you have? There are 3 different trims for the .64. 48, 52, and 56. From the experience with my 2871r set up and reading other people's set ups, depending on which trim you have you'll hit full boost in the late mid 3000's to very early 4000 rpm. Which imo isn't too laggy. For 330 whp, you'd have to be boosting above 17 psi with a 28rs anyways. A couple years back I was running a HKS GT2530 which is similar to the GT28rs .64. At 17 psi with stock cams, exhaust manifold and stock turbo elbow, I was only getting 280 whp on a Mustang Dyno. Hitting full boost around 3300-3400. I think with upgraded cams, exhaust manifold, turbo elbow, and upping the boost would've gotten me close to 330 whp, but that seems like too much work for this turbo. BTW, I ended blowing the HKS GT2530 turbo up by pushing 21 psi trying to get that magical 300 whp mark.