Maybe I am not understanding something but why would you go from twins to a big single. Does a big single make more HP at the same boost levels? If so, please explain because I would like to know.






Thanks,



JBC

 

Check this link, it should tell you all you want to know about the pros & cons.

www.scuderiaciriani.com/rx7/turbos.html

 

yes

Ken
"94 PEP, White, Red Leather
www.nopistons.com

 

twins kick ***!

 

I had my twins rebuilt and converted to non-sequential. Price played a big factor for me
Rebuilt/Non-Seq = 1100
New Single Turbo = 3,000/5,000

cant afford to run the big single just yet.

 

I would like to know the what cons there are for single,other than $$$$$$.

 

From what I gather through talking to turbonetics there is a limit to the hp you can get from the twin set up. With the single you can get more power and have a hell of a lot less to worry about when it comes to vacuum lines.

 

The only draw back to going single is you won't pass emmsions. You have to remove the airpump to fit a single in, but the pro's far outweigh the cons for going single, if you can afford it.
Ernie

 

The twins give you the great low end, but I never
got used to the flat spot between 4500-5000rpm
when the secondary kicked in. I think the single
is more refined because when you are just
cruising, boost builds evenly and more gently.
The twins react so fast driving smoothly is
much more difficult, for me anyway. Not that I
drive slowly, I usually keep my foot in it, but
the single is very docile. When you get it
going it gives you much more than the twins.
Even though on my kkk, I dont see max boost until
4200 rpm- I get around 7psi at 2800-3000rpm.
I tell you, it is no dog down low- not like I had
been warned.

 

You can pass emmissions with a single. It just depends on how you define "pass".

If you define pass, as in, stick the sniffer in, and get good HC/CO results, it isn't too hard. You get a GM electric airpump and have the EMS run it via a relay.

Maincat + air pump = decent smog numbers

Now, if it is a visual inspection, your car will FAIL (and I do mean FAIL).

Single (from what I understand) means no EGR, non-stock airpump (there goes any hopes in CA), usually lacks ACV (but with a PFC it can, it will be a hack though, to use the electric pump with the PFC).

Oh....regarding the "sluggishness of a single down low" - remember, it is a big pump. When it isn't at 100%, it still can outpump your two smaller pumps. It doesn't even have to work as hard to put out more power down low, not fully spooled, to outdo stock twins in a FD.

A.F. - still stock sequential, not power-hungry yet....