vj226966

I posted a thread awhile back about buying a Turbo Fb. Time is getting close and i really need to know about carbed turbo cars. The motor is a T11 with s4 t11 rotors and s5 plates.It has a Rotary Shack Hybrid turbo and he has it running at 16psi. Its running off of wastegate pressure and the wastegate was ported. Does this sound right? The car has a Oer carb. I dont want to spend my money on a headache. Can you guys give me some info?

PercentSevenC

Sounds like a decent setup. What do you want us to tell you about it that you don't already know? RotaryShack has details on their hybrid turbos here:
http://www.rotaryshack.com/turbos.html

Oh, and yes, blow-through carbureted turbos are a headache. Though it helps if it already has a good tune.

vj226966

Well,is running 16 pounds of boost to much for a street ported 13b? I know nothing about turbos at all.Everyone says this sounds like a good set up, but with the info that i gave would you stay clear? I dont want a 3 grand parts car. I did research and found the original owner on here and he had problems of it running lean. Then he traded the car to who i may be buying it from.Someone on this site has to have some kind of helpful knowledge about a blow through set up. I need imput bad and fast before i pass on a deal or make a bad purchase

Directfreak

iTrader: (2)

Webers/Dellorto/Mikuni's all run lean under boost. They don't have large fuel bowls.

Also sounds like you don't know much about boost, much less boosted rotaries.
I would keep looking for something else if I were you.

vj226966

I greatly appreciated your input. What i am asking is do these numbers make sense. I have been looking, asking questions and everyone gives me short answers. I know not to abuse things but can someone give me the facts, please.

PercentSevenC

Yeah, that's the problem with a single 2-barrel carb. The fuel inlet simply isn't big enough to feed a high-power rotary during long WOT pulls. That's one of the many reasons blow-through carb setups are a headache.

So you're just asking if you can run 16 PSI with an S4 T2 rotating assembly? The answer to that depends on a lot of things: turbo, intercooler setup, tuning, heat shielding...

Yes, there are people who run 16 PSI or more on pump gas. Would I feel comfortable doing it with a carb? No, I wouldn't. Could you, if you were brave/confident in your tuning skills? Sure.

Jibaro 12A

iTrader: (8)

If I were you I'd do alot more research before buying a boosted car. It sounds like you may be in a lil over your head.

vj226966

I talked with a few people and i was at first told to find out what rotars were in it cause off compression issues. Well the motor is a Turbo 11 with a Hybrid Turbo. Its just a modded stock turbo. The wastegate was also modded. I talked to the guy at RotaryShack, he is the person who did the work on the parts and explained to me the set up for that car. So everything seems on the up and up. I will to a compression test before i buy the car.

Jibaro 12A

iTrader: (8)

sounds good. Whats happening with the 79 you own? You selling SA parts?

Directfreak

iTrader: (2)

Other than running very low boost (under 10psi) There is no "cheap fix" for a lean running mikuni style blow through. You will need either more carb, or some sort fuel injection if you want to keep it from running lean

Keep in mind that Robert from Rotaryshack has had a "less than stellar" feedback from people here on the forum. It wouldn't hurt for you to research him before you make a final decision.

While robert from Rotaryshack might be a blow-thru Guru...

I would do a Forum search for the names 680RWHP12A and 730WHP12A, along with the name "Rotaryshack".

You will find both positive and negative information regarding him and his work.
It's just better to be educated on the matter.

.

rx71king

iTrader: (6)

you might be setting your self up for a big let down....if you do not no how to tune a carb or do you ? what's the matter with the car you own now?

Jibaro 12A

iTrader: (8)

+1 Before I became I member on this board I did business with him. Lets just say I wouldn't give him my money ever again. He has horrible feedback with the guys that don't reside in his state. All the locals seem to have nothing but good things to say.

Jibaro 12A

iTrader: (8)

I agree. Research your *** off. After your done start all over. Do you understand how blow-thru set up works? Are you familiar with tuning a boosted car/ carb? Do you have the time/ patience/ know how to get it running properly and to maintain it? I'm not trying to sound like a hater but you might want to make sure you cover all your bases before you dive in. You don't want to end up with 2 incomplete projects and a pissed off wife. (ask me how I know)

vj226966

The situation is this. I am not going to buy the car unless i can drive it first. The original owner "assured " me the car ran fine when he traded it to the current owner. The "current owner" said it was leaking gas, so he sent out for a rebuild kit. He told me, "when he drove it" it ran fine. I know the obvious, check for compression first. I will need to get the car kind of tuned so i can at least test drive it. I also was told to listen for "pinging " while driving. It has a locked distributor also. I guess if it starts, drives, pulls, and doesn't smoke i should be good? If this deal falls through, i will be going back to my 13b Sa swap. If it goes good i might sell my Sa, but my wife smashed my windshield

81WideMariah

iTrader: (8)

This quote alone is a big reason you need to do more homework. If you hear pinging on a turbo rotary... it's already too late. Damage is likely done, and a rebuild will be in order. You should REALLY listen to what everyone else is telling you.

Answer these questions:

1. Can you tune a carb?

2. Do you know the difference between Idle Jets, Main Jets, Air Jets, Emulsion Tubes, Chokes, Float levels, etc and what each circuit of the carb does, and under what driving conditions they come into play?

3. Do you have a wideband 02 sensor? Do you know how to read it, and what a safe AFR is for your set-up?

If you can't answer these questions completely and accurately, then you should really walk away from this, before you add another lawn ornament to your collection.

vj226966

I have not seen or drove the car yet. If i could get my hands on a manual on carb tuning and how to read a wideband i think i could get buy.Yes the car has one.I am trying to get all the information i can first "before" i make a purchase. I know"if its to good to be true it probably is" thats why i am trying to get all the info i can first. If it needs a tune and thats it, i got a Turbo FB. If it needs major work i will pass it buy. I really appreciate all the comments i am not going to jump in head first for sure.

PercentSevenC

The manuals on Weber-style carb tuning are mostly geared toward low-power, NA, multiple-carb piston engines. They're a good place to learn the basics about how the carb works and how to rebuild it, but take all their jetting/e-tube/etc. recommendations and throw them out the window, because what you need will be very different.