Fast Intentions Stage 2 TT build by MA-Motorsports.

Spooler · 12-11-2018, 10:41 PM

Posting some of my thoughts about why I changed to the FI 2.5 turbo's.

My personal goals for my car are different than most. I want to make the most whp with the lowest amount of boost I can make. Boost is just a measure of restriction. The restriction can be in the intake side, the exhaust side, or a combination of both. Someone pointed out to me that I will not make my whp goals with the FI 2.0 turbo's (No names mentioned, you know who you are). That was Ok with me but I wanted to figure out why. I started searching around for as many dyno graphs as I could find with the FI 2.0 turbo's. The only problem I found was that most folks that had the 2.0 turbo's didn't have a built engine. That means the tuner was trying to limit the TQ on the engine down low. So the data would be skewed. I then studied the dyno graphs of Justin and Phunk's build. Hmm, interesting. At 4k rpm he was at 10psi of boost just like the FI 2.0 kit. Seb was trying to limit the TQ on his tune also due to his stock block. To me I consider this to mean the lag/response difference was very minimal. So now the question is why not use a GT3076 turbo (FI 2.5 turbo's) instead of the GT2868 (FI 2.0 turbo's). The answer to that is simple, cost. I already had the FI 2.0 turbo's that I originally ordered with my kit because, at the time, I was going the build the motor at a later date. So, why did I decide to upgrade anyway. Good question that I will talk about at a later date.

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12-11-2018, 10:41 PM	#11 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,999 Drives: 2013 Nismo 370z Rep Power: 2684392	Posting some of my thoughts about why I changed to the FI 2.5 turbo's. My personal goals for my car are different than most. I want to make the most whp with the lowest amount of boost I can make. Boost is just a measure of restriction. The restriction can be in the intake side, the exhaust side, or a combination of both. Someone pointed out to me that I will not make my whp goals with the FI 2.0 turbo's (No names mentioned, you know who you are). That was Ok with me but I wanted to figure out why. I started searching around for as many dyno graphs as I could find with the FI 2.0 turbo's. The only problem I found was that most folks that had the 2.0 turbo's didn't have a built engine. That means the tuner was trying to limit the TQ on the engine down low. So the data would be skewed. I then studied the dyno graphs of Justin and Phunk's build. Hmm, interesting. At 4k rpm he was at 10psi of boost just like the FI 2.0 kit. Seb was trying to limit the TQ on his tune also due to his stock block. To me I consider this to mean the lag/response difference was very minimal. So now the question is why not use a GT3076 turbo (FI 2.5 turbo's) instead of the GT2868 (FI 2.0 turbo's). The answer to that is simple, cost. I already had the FI 2.0 turbo's that I originally ordered with my kit because, at the time, I was going the build the motor at a later date. So, why did I decide to upgrade anyway. Good question that I will talk about at a later date.