I remember awhile back that there was someone (maybe in florida) that had done alot of 20b stuff. They had a couple pictures of a custome stainless manifold with 2 aftermarket turbos (like a honda 4 cylinder race turbo). Id love if you could post some pics of that again. I thought the design was innovative since it doesnt require the huge housing of a big single.

Would the owner of those pics be willing to post them up? Is that setup even a "for sale" item? Maybe a dyno chart?

i guess is just need a 20B "fix" for awhile

 

Was it GT1-20b's pictures?

http://photobucket.com/albums/v112/GT1-20b/

 

Yeah Carlos has that stuff for sale...he is leaving tonight for Argentina however (to race!) and will not be back for a week or so. I cannot remember what turbos he is using on his car. He has a third gen with that setup (twin turbo). I would send him a PM or call him next week. 305.970.1774. He has a new shop phone as his cell coverage is poor there but I do not have the new number in front of me.

His work is top notch. Just had him build an engine for me.
https://www.rx7club.com/forum/showthread.php?t=412677

 

Yup, those are the pictures! I just couldnt remeber then screename. Thanks!

 

^

 

That looks nice, but it also looks pretty heavy!

What is the expected power output of it? I assume for pure drag only?

 

It's off a customer's car from City Performance Centre
http://www.cityperformancecentre.com. I believe the car made over 1000.

Red,

How does the new turbo feel? I'm in the process of deciding what to use on my project. I've been working with Joe at Tec Turbo. He seems very knowledgeable. I am supposed to get a final recommendation from him next week.

Here is what I know so far:
-Comp wheel Dia. 75MM
-R trim exhaust wheel
-1.5 exhaust AR
-5" outlet.
-a special compressor housing that is supposed to be good for a 10%+ increase in efficiency.

I told him I am looking for 720fwhp (end goal of 600rwhp) at <16psi. The above setup seems a weee bit aggressive, and I'm not sure I buy into the claim about the compressor housing, but I'm going to wait until I get a map from him before I make a decision.

 

I haven't redyno'd or really driven the new turbo setup. I have a few misc tasks to do, but I have been lazy. I am waiting for really nice weather before I tear into it all again. That turbo you listed seems aggressive. But it all depends on your engine. If your engine is providing lots of airflow, then that turbo will make a lot more power than your goal. Almost too much really.

The T72 I had made more than 630 rwhp @ 13.5 psi of boost. I had boost INSTANTLY. In 5th gear, just crusing at 80 mph, I could give it gas and watch that needle instantly jump up.

 

Yea that looks a bit extreme. This is the set-up I want to see numbers on:

http://photobucket.com/albums/v112/G...reet3Rotor.jpg


Those look like twin Gt2871's or GT30's.

 

if you are looking for 600 rwhp you will need 80 lbs per minute of compressor flow w reasonable efficiency at your pressure target. this assumes you have excellent porting and support systems.

howard coleman

 

Hi Howard:

I have been following the airflow to hp conversion factor discussion on the other forum. Using the dyno numbers generated by people with the T04S and GT35R, as a reference, both of which are good for ~60lbs per minute at a pressure ratio of 2.2, I came up with a conversion factor of 1.6 to go from FWHP to airflow. Assuming I want to make 720 flywheel HP that calculates out to about 88.128lbs per minute.