GLHS

This guy had a 88 T2 with a carb blow through system.

He said he they did internal work to the carb, to handle the boost.

****** car went like 11.04.


This was @ NOPI this weekend.

emagdnim

A carb on a turbocharged engine? I bet it'd run 10.x if it were EFI. Carbs + Turbos = Bad.

DaleClark

iTrader: (55)

Yeah, I've seen quite a few quick turbo rotaries with carbs, mainly among the PR drag guys.

They work, and can make some great power, but driveability REALLY suffers - carbs and turbos don't get along well at all.

Not to mention carbs work by a restriction - they can really choke down the overall performance of a turbocharged car.

Dale

peejay

Wrong.

Carbs have several afvantages... you don't have to worry about "holes" in the tuning map, you don't have to worry about poorer driveability when you have to run a 3. 4. or 5 bar MAP sensor (many EFI systems lose resolution when you do that), you don't have to worry about "running off the end of the fuel map", you don't have to worry about hitting 100% injector duty cycle... there are *advantages* to having a purely mechanical system.

True there is a pressure drop trough the carb. The solution is to run a little more boost to bring manifold pressure back up. We're only talking 1 or 2 psi at the very most.

Drivability poor? Not with a blow-through setup.

Ryde _Or_Die

So this was in Bradenton? Was it the silver one or the black one? Sounded like the silver one had a BP.

adidashatesnike

iTrader: (1)

Yea i saw the silver one run too it was really fast. And I agree with the bridge port comment sounded really brappy. I was really dissapointed in that pro street rx7 tho launched crooked everytime he got up.

NZConvertible

Holes in a fuel map are just poor tuning, nothing else. You can have holes in the fuel delivery in a carb too, in fact it's almost impossible not to to a small degree because they're so simple. Why would you run a MAP sensor higher than 3bar? You only need that to exceed 30psi boost! How many street cars run more than 30psi? Practically none. Those that do have many other components that have a much worse effect on driveability than the MAP sensor, like big cams/ports, huge turbos, paddle clutches, etc. Huh? An injector is basically a hole that fuel flows through, just like a carb's jet. Both have a limit to the amount of fuel they can pass. If you get close to 100% duty, get bigger injectors. If you jets can't flow enough, get bigger ones. Simple. Sure there are a few, but they are insignificant and are greatly outweighed by the disadvantages. So you making everything work a bit harder to overcome a restriction. Whatever way you look at it, it's still a loss that EFI doesn't suffer. You could just as easily add that 1-2psi to an EFI car for even more gain. But it's a fact that you can go much bigger with an EFI TB than you can with a carb, because you don't have to worry about keeping velocity up to ensure good fuelling. Using Webers as an example, a 51IDA will flow more than a 48IDA (and make more power), but it'll lose torque down low. With EFI you can run a 2x55mm TB with no problems at all, and make much more power. Assuming both are tuned well, EFI will always beat carbs for driveability. Period. With EFI you can individually tune hundreds of individual load/rpm points. A carb has three or four circuits that're supposed to cover all possibilities (but can't). The more often the mixtures are correct, the better driveabilty will be.

NZConvertible

Don't think this is because it's carb'd. It goes this fast because it's got a huge turbo and lots of boost. Power is about airflow, not how you get the fuel in. If an EFI setup and a carb setup can flow the same amount of air, they can both make the same peak power and run similar times.

bkapold@aol.com

Rafael Rivera runs 7's w/ carb tube chassis Turbo II (Rafelito) He's not alone though...Like that other guy said, in Puerto Rico alot of them carb the cars....

SPEED_NYC

iTrader: (3)

lets also not forget thaty rafielito was the fastest and quickest import car oin the world for many years, and even after sakura took the fastest import title from him, he remained the fastest rotary in the world, till his best et was beaten by a 20B efi car.

as far as 2 rotor goes, rafielito still has one of the quickest cars out there, and he is running one of the oldest and heviest chassis in the pro class.

to go fast you need airflow and fuel, you cxan get either with carb of efi, nzconbvertable, dont make this into a drivability argument, we are talking potential for power and low et's here.

peejay

Actually if you know what you're doing, driveability's about the same as a turboless carb setup! Certainly better than a half-*** job of implementing/tuning EFI.

It's not "perfect", but it's definitely not "bad".

KNONFS

iTrader: (14)

I'm still waiting for him to come out again, rumors say that he will be running carbs, and plan to go 7.50 and that if he doesn't EFI is on the way..........

NZConvertible

I never even mentioned driveability.