Phil Jacques

Buddy of mine suggested me going 3rotor over LS1... It would probably end up cheaper in the end.

I know NOTHING about rotary engines at all... Frankly... they confuse me, but that's a whole different subject and I will learn with more reading...

My whole reasoning for an LS1 was tq down low... I want to Time attack the car and do track events and have tq so I could come up off the corners and control the car with my foot, not the boost.

However, I have seen a few 3rotor dynos, that seem to have the peak tq right around 3500... which is fairly comparable to an LS1...

http://www.youtube.com/watch?v=PJJlvw7SGtY I found this video on here supposedly of a 3rotor FD running with an LSX FD... They seem almost comparable...

So what would I have to do to keep good low end tq? Is staying sequential and just upgrading turbos the best option? Is a single GT35R a better option?

I am looking for in the range of 450-500rwhp and i'd like to have tq withing 50 numbers... Am I asking too much? Like I said, just not familiar with these engines at all yet...

Thanks for ANY help!

Phil

Aaron Cake

iTrader: (1)

A 35R is a bit small. A 4088R would put down those numbers all day long with excellent response low and midrange. Just a mild street port will do the job, mainly to clean up the funny 20B exhaust ports and enlarge the primaries a little.

Phil Jacques

Would I need to upgrade anything engine wise to keep reliability there? I don't want to be busting stuff up every time I run the car hard.

I'll look into 4088, I just thought of the 35R cause I ran one on a couple boosted Nissan's I've had. it made great power and had quick response.

farberio

iTrader: (7)

Rotaries have huge combustion chambers compared to piston cars. So you need more air to achieve the same boost. Hence why the 35R is small for a 20B.

Phil Jacques

Ahhh okay!

I am trying to find a couple dyno sheets of people making in the range of power I am looking for with a 4088r or 42r, I want to see where the tq curve REALLY starts to ramp up. I have been spoiled owning a couple cobras lately... That torque is REALLY something that is nice to have in the right spot... I was avoiding going back to 4cyl land in 240s for the lack of low and mid range tq. I will keep looking and post any more questions I might have here.

Thanks Guys =)

Phil Jacques

which turbine housing on the 4088r?

I read the turbo is good for close to 600whp on the 13b... assuming more on the 20b... Since I am looking for under 500whp, I think I would be okay with the .85 A/R turbine housing for a quicker spool, no?

farberio

iTrader: (7)

Here is a 20B with a GT42

https://www.rx7club.com/20b-forum-95/dyno-343143/

Aaron Cake

iTrader: (1)

1.0 undivided or 1.06 divided. Keep in mind with the divided housing you will need to split the 3rd rotor between valutes which is bit funky.

Addicted Performance

iTrader: (51)

You can make 500 whp with the stock 3 rotor turbos and have boost and torque almost instantly. Check out Pettit's


And it will NOT be cheaper to do a 3 rotor. . plan on 15k just for getting the motor in there. And that is cheap

rotaryB-2000

35k to make power out of a 20B seems a bit high.. there are shops out there than can do it for half that