T51rKai or T88 streetable?
Originally posted by Marcel Burkett
Thee was a 1" hole drilled into my GREDDY intake elbow (long story ) and you could feel the pressurized air leaking out , it did not show on my boost gauge because of course it senses on the other side of the throttle body.
Thee was a 1" hole drilled into my GREDDY intake elbow (long story ) and you could feel the pressurized air leaking out , it did not show on my boost gauge because of course it senses on the other side of the throttle body.
Rotary Freak
Joined: Nov 2001
Posts: 2,715
Likes: 1
From: trinidad and tobago
What exactly is intake air ?, there is always a vacuum at the intake so it would suck air not push air , if you are feeling air escaping too then your turbo is also producing positive pressure at idle , this may not be any thing GREAT but I just mentioned it to show that my turbo was behaving like any other , (smaller one ) although it is a T70 and said to be too BIG .
Originally posted by milkman2k52
I dont think you're going to get flamed here because most think as you do (hence the larger numbers of, well, larger turbos). The only real downside of having a large/laggy turbo is, in my opinion, lack of throttle response.
Lag is not what rpm you make what boost at, that is boost threshold. Lag is when you depress the accelerator and have to wait for the boost to come on. This is helped by having lightweight moving parts in the turbo (ala the kai w/ its aluminum compressor).
All in all though, bigger is most certainly better to a point. Unless you plan on autox alot
I dont think you're going to get flamed here because most think as you do (hence the larger numbers of, well, larger turbos). The only real downside of having a large/laggy turbo is, in my opinion, lack of throttle response.
Lag is not what rpm you make what boost at, that is boost threshold. Lag is when you depress the accelerator and have to wait for the boost to come on. This is helped by having lightweight moving parts in the turbo (ala the kai w/ its aluminum compressor).
All in all though, bigger is most certainly better to a point. Unless you plan on autox alot
Don't mean to be a stickler, but people tend to use the wrong term to describe "boost response."
Throttle response is more associated with the fuel/ignition mappings and the mechanics of your throttle mechanism (cabling, plates, etc).
Lag is the spool time associated with reaching FULL boost.
I agree with Marcel about big turbos. VE is more important than what boost level you are running.
So, check the compressor maps to see what kind of flow you could have compared to the pressure ratio.
Many big turbos flow more air (and hit efficiency) at lower boost levels than a smaller turbo.
Compressor is heavily associated with efficiency and the turbine is heavily associated with lag (or boost threshold).
J
Full Member
Joined: Mar 2003
Posts: 135
Likes: 0
From: fall river ma
Lag is the spool time associated with reaching FULL boost.
ok say u can make 350hp thru a smaller less efficient turbo and hit full boost at 3500 rpm...a larger more efficient turbo will make 350 a lil later in the power band but the hp #'s wont start slowing down unlike the maxed out turbo..it will keep climbing as more boost is reached...im not a expert just my reasoning as i read this...i havent built and large turbo 7's either..
Im tired of hearing these lag issues, i help reactive racing, we run a TV-45 and get 400rwhp by 4000 rpm with a streetport, i will be running a T-72 turbonetics and will get high boost sooner than that, you all need to start thinking for yourselves and stop listening to others, you can use simply huge turbos on rotaries because of their strong exhaust pulse, but you also have to port properly, and if you want to have that correct, do it yourself, no shop these days uses their full knowledge, ports large enough, or in the right places, and they dont want to give you their race knowledge, because then they did all that research for nothing, ive seen various ported motors from most of these rotary shops, and they are pitifull.
Rob
Rob
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