Quote:
Originally Posted by Ironsquid
Drivability on the low end has NOTHING to do with the size of the turbo and you are severely mistaken.
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Wat.
Quote:
Originally Posted by jamesm
you've very, very obviously never actually tuned or even driven in one of these cars equipped with the turbos you speak of.
you simply cannot make the same amount of horsepower on a 'properly sized' 28xx turbo that you can with a 30r or 35r on pump gas reliably. i know this, from experience. and yes, this engine is remarkable in the way it is able to spool these 'huge' turbos. there is almost no perceptible difference in 'lag' between my 2867r and a 3076r. the 3582r doesn't add much on top of that.
and xx psi @ xxxx rpm does not effectively quantify how responsive a turbo feels. the t3/t4 hybrids build more boost at lower rpm than the gtx's (maybe, depends which ones you're comparing), yet feel far less responsive.
speak from experience. if you were, you wouldn't be saying the things that you are.
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James, don't think you are suddenly knowledgable about everything, because you have starting tuning cars; and that everyone else is inexperienced.
All the cars and turbos I have quoted, I owned, and tracked them. Granted I didn't tune them.
If there is no lag difference between your gtx2867r and a gtx3076r, I blame the tune, or the car. Show me a dyno where one turbo has been taken off and replaced with the other and there is no lag difference. You can see on the PTUNING kit where the max boost is reached. Its around 500 - 1000rpm later than a gtx28, depending on whos dyno you are comparing it to.
I'm not saying that a gtx28 turbo will make the same power as a gtx30. I'm saying that using a gtx30/35 for a hp target that a gtx28 can easily reach is not always better.
I spent the day at the track yesterday driving my ae86 drift car. 2000cc, 400whp. Spins up 4th gear while spooling. It just makes me laugh when I'm out there driving that, that there are people here talking about having more than that in a street car.
This is pump gas. 10:1 static comp.
Oh, and its a t28 frame turbo. (Tomei M8270) Not even BB.
Granted, I am considering replacing that turbo with a gtx3067r. I think it's well suited to what I want from the motor. I'll stick around the 400whp mark, but it should spool sooner (because BB and billet), and run cooler. But, take note, I'm at the 400whp mark, making the call to go from t28 frame to t30 frame. I wouldn't be making that call at 300whp. gtx28 for 300whp all day erry day.
Look, we all have different goals, and I'm doing is putting forward a counter arguement; as I dont like seeing a heavily one sided thread, which will then lead others to believe its fact.