94touring

This is a better comparison.



"On a base map (PFC), 337 rwhp / 284 lbs torque @ .83 boost. Stock block, turbos, and stock injectors for this run. A/F was solid 11's across the board"

kahren

well that one makes even more power everywhere so u can see how much more low end it has.



all i am tryign to say is runnig osmethign liek a t78 at 15 psi and gettign 450 at wheels and mostly using it there is plai stupid. if u want 450 at teh wheels why not just get a turbo that is efficient at 450 at wheels and have much more low end. why loose low end when u dont ahve to. i am not sayign i want a v8, i hate the v8, but i dont see how this makes sence. just tyring to help everyone out. i think peopel see the large turbos and just want to buy them withotu realizing everythign about them.

rx7raca

Well all this would make sense. Think about what the t78 is rated for. Well over 600whp last time i checked. The t04r is a good turbo for 450-600 The stock turbos alone can make 350whp, and there is a huge difference in size of the 2 turbos. The t78 is for a supra or something with a torquey *** motor, but thats another story...also think about how much psi the t78 can handle vs. the t04 and think when it can get that psi.



This turbo BS is just all opion. If you want crazy top end then you get the turbo that fits that spec. If you want low end to mid then you get that turbo that can do that.

Dysfnctnl85

I wasn't implying that...I was just asking how that guy made so much torque down low, that's all.

1Revvin7

kahren I had asked this same question a long time ago and I forget the solid answer, but it was along the lines of making more power at lower psi. Just enough power where no one has to mess with high psi/race gas. You can also make a big single turbo hit hard on the low end if you want, just throw on a smaller turbine a/r or trim. But then ofcourse the high end would choke. That also come back to the point of why run a compressor that is made for high psi out of its effieciencey range? -> Larger turbines flow more air easier than smaller compressor wheels. But keep in mind that there are many different style compressor wheels, for a example a T76 produces a lot of power out of its compressor range from I believe it is 15-22psi more than for example a To4S that is in its efficiency range there.

jspecracer7

The thing about big turbo's is you can run them at low boost(11 psi~) and make good power(Vosko made 400~ with 11 psi) as a daily driver, and then turn around and up the boost to 19 psi for the track and make even more power(500+ ). If you were ONLY going to stay at a certain PSI(say 15psi) then you would stick with a turbo that performs best with that boost right? Well, if the big single flows more air at a certain PSI, why wouldn't you get it? Good example of this is the T-04R vs. T-04S. R makes a little more power at 15 psi, but can be considered "big turbo".



That whole "low end" thing is crap. If you've never driven a single turbo FD, especially one with a "big single" then you have no room to talk. I was DEAD SET on staying stock twins so I wouldn't have to wrry about lag...so I tried to setup my sequential system as best I could, and on a roll I would start pulling away for about 1000 rpms...then my opponent would pass me. When I went non-sequential, I would reach full boost at 3200 rpms...figured I'd have more midrange pull....didn't matter, still kept losing. With the 62-1, I would reach full boost between 3500 and 3800 rpms. I would ANNIHILATE all the 350~ hp FD's around here with ported motors/sequential twins/etc.... They would pull away for about 500 to 1000 rpms...and then I'd catch up/pass them by the time I got to about 6000 rpms(same gear). By the time I shifted(say 2nd gear to 3rd) and topped out in 3rd gear at 8000 rpms...I was GONE.



Rotary's don't make enough "low end power" to necessitate worrying about lag. The best anti-lag is a thing called "downshifting"

1Revvin7

94touring

Wasn't directed at you.

94touring

Which brings up a good point. The guy who bought my car was very amazed at the low end power it had, and he had a twin turbo rx7 too. He was literally afraid to push it past 5000rpms.

Dysfnctnl85

Oh, well in that case, .



But my question still stands.