GT500R-SP or GT3574R?

speedjunkie · 01-18-2009, 11:45 PM

I posted this on evil forum a few hours ago, but no one is chiming in. I forgot, most of the knowledgeable people are over here already haha, leaving mostly noobs over there.

I was looking into the GT500R from A-Spec, and when I talked to Sean and told him what I wanted it for he suggested going with a GT3574R customized for my application.

I will mostly be using it for road course and possibly autocross (I know Rich, I know ), but I want to get decent top end from it too. This will most likely never see a drag strip, and only possibly see a few highway runs (I like going from a roll, that's why). I'm more into spirited backroad drives on curvy roads.

This is what the site says for the GT500R...
These setups are capable of 500whp@20psi with the right combination of build and a proper tune. We have seen 503whp@20psi on a large street ported motor. Most customers will see around 430-440whp in the 15-16psi range. With that 15psi being achieved around 3800rpm leaving you plenty of RPM to have a nice power band.

Sean said the GT3574R would be able to reach 14psi around 3400 and still be able to get up to around 450-500whp but it wouldn't be as efficient as the GT500R. He didn't say that verbatim, but that's what I gathered from information he gave me. Obviously this turbo would be ball bearing, and as I said, he said it would be customized for my application.

Being that the GT500R has great response for a good size turbo, it's really hard to turn your back on this one. However, the GT3574R has even better response and can still get pretty high into HP, just not as efficiently. I'm also getting the screamer pipe rerouted back into the DP, and getting everything ceramicoated. For the GT500R kit, with a military discount would be $3919. The customized GT3574R would be about $100 less.

FYI, I have an agressive streetport, RE monster VMIC, wide open exhaust with only a resonator to quiet it a bit (with GReddy Ti exhaust), 1000cc pri and 1600cc sec, HKS twin power, and more but I'm not sure what all matters for your advice.

So guys and gals, what do you think? Which one? Also, people that have either of these (although the customized one will be hard for someone to have haha), please chime in.

View Poll Results: Which turbo kit?
GT500R	8	66.67%
GT3574R	4	33.33%
Voters: 12. You may not vote on this poll

01-18-2009, 11:45 PM	#1
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO Posts: 2,089 Rep Power: 20	GT500R-SP or GT3574R? I posted this on evil forum a few hours ago, but no one is chiming in. I forgot, most of the knowledgeable people are over here already haha, leaving mostly noobs over there. I was looking into the GT500R from A-Spec, and when I talked to Sean and told him what I wanted it for he suggested going with a GT3574R customized for my application. I will mostly be using it for road course and possibly autocross (I know Rich, I know ), but I want to get decent top end from it too. This will most likely never see a drag strip, and only possibly see a few highway runs (I like going from a roll, that's why). I'm more into spirited backroad drives on curvy roads. This is what the site says for the GT500R... These setups are capable of 500whp@20psi with the right combination of build and a proper tune. We have seen 503whp@20psi on a large street ported motor. Most customers will see around 430-440whp in the 15-16psi range. With that 15psi being achieved around 3800rpm leaving you plenty of RPM to have a nice power band. Sean said the GT3574R would be able to reach 14psi around 3400 and still be able to get up to around 450-500whp but it wouldn't be as efficient as the GT500R. He didn't say that verbatim, but that's what I gathered from information he gave me. Obviously this turbo would be ball bearing, and as I said, he said it would be customized for my application. Being that the GT500R has great response for a good size turbo, it's really hard to turn your back on this one. However, the GT3574R has even better response and can still get pretty high into HP, just not as efficiently. I'm also getting the screamer pipe rerouted back into the DP, and getting everything ceramicoated. For the GT500R kit, with a military discount would be $3919. The customized GT3574R would be about $100 less. FYI, I have an agressive streetport, RE monster VMIC, wide open exhaust with only a resonator to quiet it a bit (with GReddy Ti exhaust), 1000cc pri and 1600cc sec, HKS twin power, and more but I'm not sure what all matters for your advice. So guys and gals, what do you think? Which one? Also, people that have either of these (although the customized one will be hard for someone to have haha), please chime in.