How long would it take a 20b, with a very aggressive street porting job, to spool a gt35r, how long woudl it hold max boost. And how long with it take to spool the gt42r and how long would it keep full boost as well? Woudl turbo would you suggest for just massive power and full boost at around 4000rpm to 5000rpm with a 20b? Or better yet what turbo would get full boost right at around 2000-2500 rpm on a 20B.

 

GT35R will be too small for that engine. A-Spec Tuning offers a 20b 42R single kit. Go over to their section and read their thread about it.

 

no no, too small isnt the point. It woudl still push more air than the stock turbos right?

 

since the 20b is 50% larger than the 13b it is an easy question to answer.

a midrange turbo for a 13b puts out about 55 lbs/minute... that's 795 CFM or about 414 rw rotary hp.

if you want something similar state of tunewise you are looking for 82 pounds/1200 cfm and 621 rotary rwhp.

BTW, good luck in keeping any rear tires on the car. you will also need an exedy twinplate clutch. i suggest the ZM022SD.

howard coleman

 

wow, since when are you a mod howard?

 

No no, again you guys are missing the point I just want aturbo that woudl spooll at 2500 rpm but provide more air then the stockers. This was all just theoretical. I'vve been lookign at the stock twins on the FD lately and I'm liek its nothing more then 2 turbos on a single exhuast outlet for the down pipe. I'm sure there has got to be a way to fab up a sequential using a 20B a gt35r and then a 42r or t51 kai for the remainder of the boost you know? It was just all theory.

 

you would never fit two large turbos like that:P

hard enouhg fitting on gt42r.

But a gt4202r with a 1.15 and streetport should be around a bar by 4500

 

Great info Howard!

 

So now you just induced mismatched loads on each rotor?
I don't think that's a very good idea.
Reversion on the turbo outlet side would be a royal pain in the ***.
You're just trying to make things complicated at this point.

Why not go triple turbo?
We're going triple GT2871R's.


-Ted

 

oooo tripple even better. No becasue the stock sequentials dont miss match at all, I'm talking baout fabbing up something liek the stock exhuast manifold but to diffrent turbos, and then have the door open and close to a diffrent turbo each time you know? It would be open to only the 35r at first then when the pressure was right and so on it would close the door on the 35r at a certain pressure and go all out to the 42r or t51 kai Plus if you take out that retarded ABS system you can score a lot of room on the passenger side for fatty like the T51. All just a fun thought.

 

Be careful, cause the 20B runs it's rotors 120-degrees out of phase.
Since the 13B runs it's two rotors 180-degrees out of phase, the exhaust pulses are "balanced" coming out of the exhaust ports.
Since you're thinking about using just 2 out of the 3, you're getting a weird:
duh duh....duh duh....duh duh... Exhaust hit to the turbo turbine.
This might induce some weird things.

I think you're trying to go too complex on your project.
I wish you luck!


-Ted

 

No no this isnt even a project haha. I was just wondering if it was possible you know? Playing around with the thought for fun to see if anyone else thought about it? What do you mean by 2 out of 3? Turbos or exhuast ports on the 20b? Like I said this is all just fun and games to me. Just got me thinking after I read about the V8 Hayabusa Engine thats in those british track day cars I think they are called the Sr8s? The guys just made thier own block and it scores 350 hp up to 11000 rpm, thats pretty bad ***. Got me thinking too. What if I could machine a 2000cc 4 rotar engine with P ports and an eccentric shaft made from titanium and balanced to spin to 11,000 or even 13,000 rpm with ITBs on the intake feeding two large sequential Turbos Or even one decently sized one? Full boost at like 3000-3500 and then holding power all the way to 13,000 rpm that would be insane. A power band liek that one Silver FD has, forgot his name but he keeps making power all the way up to 9000rpm. Like I said it was just something fun to think about.