turbos and carburators
 

is there any difference in turboing a carburated car instead of a fuel injected car? what's the best way to get enough fuel?

Re:turbos and carburators
 

There is a big difference. You tune with jets instead of injectors and computers.
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Re:turbos and carburators
 

yeah and jets are the ghey

Re:turbos and carburators
 

Haha, yeah and jets are a son of a mother fucker to tune right. I swear as soon as the elevation changes by anything more than 50 feet you need to re-jet. >:( Go down a steep hill, re-jet. Go up a steep hill, re-jet. Computers are so much easier.
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Re:turbos and carburators
 

yes there is a difference, you need to either have a positive air carb setup, or you can be kind of ghetto and put the carb before the compressor so the compressor sucks the air/fuel mixture and atomizes it.

yes jets can be a pain in the ass, but jetting a carb isn't that big of a deal.

Re:turbos and carburators
 

I take it you have never tuned a street bike. Try changing the jets in ALL FOUR carbs eveytime you need to make a change.
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Re:turbos and carburators
 

as far as the basic mounting the turbo on the manifold and running cahrge pipe to the airbox/carb and hooking the oil lines is it all the same? and is there a jet(not any particular one) that i could run to make it rich enough all the time. i've seen turbos on bettles before, just curious how they do it without rejetting.

Re:turbos and carburators
 

why would you want to make it rich all the time? that's like taking a perfectly fuel ineffecient car and making it even more ineffecient. max boost has a pretty good chapter on carburated turbo set ups, you should buy that book, it's very good. it says a blow through is the only way to go with a turbo and you have to do some crap to make it work right.

Re:turbos and carburators
 

They jet them. What makes you think they don't jet them? A friend of mine has one in a rail and the lag is insane. You have to play with the gas to build boost, but once it gets up there it goes.
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Re:turbos and carburators
 

i wasn't sayin they don't jet them, i was just reading another post that said something about jetting them every time you go 50ft uphill or 50ft dwonhill. i might sound like a dumbass but i am not a carburator person. i don't know, maybe i'm too young. i'm just asking is there anyway to keep from doing this and be able to leave what jets are put in when it is tuned.

Re:turbos and carburators
 

I have an 85 carburated wagon that is slow and smells bad! :D

Re:turbos and carburators
 

boost it. ;D

Re:turbos and carburators
 

no but i've rejetted plenty of VW's V8's and Banshees for different altitudes at the sand dunes.


the banshee being most on par with your streetbike setup.

Re:turbos and carburators
 

[off topic]You ride at the sand dunes? Where at?[/off topic]

[on topic]I was just kidding about the 50ft up, re-jet thing. You just have to tune them for the altitude and it can be frustrating sometimes.[/on topic]
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Re:turbos and carburators
 

I have a ford escort with a weber dgv(down draft) carb. with the setup I had I didn't have to change a thing when I uped th boost. ran it from 5 to 17 psi you just need to make sure you have the right fuel pressure.

Re:turbos and carburators
 

Got any pics of that? I'm curious to see what that looks like. How did it perform?
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Re:turbos and carburators
 

im kinda slow, but did say sumn bout a turbo banshee? have pictures? sound interesting?

Re:turbos and carburators
 

I think he was just talking about tuning them n/a. Tuning two carbs sucks. I have seen turbo Banshees. They are ------- crazy. I have seen quite a few with nitrous. Those guys that ride them are nuts. They don't give a ---- if they eat ---- at 100+ in the dirt. :-X The funny thing is most of those guys run Toomies and one little spill and your leg(s) is BBQ and you need a whole new $$$ exhaust system. :-[
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Re:turbos and carburators
 

I don't have any pics of it yet. I made the hole set-up from the exhast manifold to the fuel regulator. It performed better than I expected altough I didn't race any-one.

Re:turbos and carburators
 

haha yeah, my roomate got the toomey T6's before we went down this last summer. they hurt like ----. it was kind of a bad trip as far as luck goes. long story, i'll post it in general sometime.

no, no turbo banshee, yet. sorry.

we usually ride in oregon, right near florence. or in rexburg idaho. rexburg is about 5 hours closer, but oregon has less rock.

Re:turbos and carburators
 

hmm i think turbos and carberator are like playing catch with a hand grenade.

Re:turbos and carburators
 

i like how people have such a strong opinion of something, and completely fail to back it up with any sort of comment regarding what they've heard/read/experienced.


"playing catch with a hand grenade"

well young tyke, they were boosting carbed vehicles long before they were boosting Fuel Injected vehicles. a lot of aircraft engines are stil carbeurated turbos.

please back it up with some kind of supporting statement. your opinion means nothing without something to back it up.

Re:turbos and carburators
 

airplane engines are turbo?

Re:turbos and carburators
 

I have Toomey T5's on my banshee and I never burned my leg. Whenever I crash I get thrown 900ft from the bike and since the pipes are tucked into the frame, the bearing carrier, tires, and handlebars take all the abuse.


Turbocharging a Banshee is a little more forgiving because of the fact that its 2-stroke. If you use a variable jet and a fuel pump it takes care of the fuel management part of it. It takes alot to gernade a Banshee. When I ride on the street I used to be able to get the pipes to glow red hot back to the silences doing 6th gear burnouts (I'll try to find the pic :))

Re:turbos and carburators
 

Just found this kind of funny, yes a lot of airplanes are carbed. A funny story about this is in WW2, during the battle of brittian.

The British Supermarine Spitfire was run on a Carb driven Merlin engine, while the germans had develped fuel enjection on their Bf109's. A common Luftwaffe tactic was to fly a 109 mid altitude while the squadron wated above out of site, when a spitfire would go after the lone 109 the pack would dive after the spitfire.

Since the spitfire was Carbed it couldnt dive out or climb up at any large angle of atack to escape because the carb would starve the engine and kill it. The 109's could fly all day upside down because of fuel injection.

Anouther 109 ploy was when you had a spitfire on your tail, was to dive....if the spitfire followed, they'd kill their engine

Just so you "know something about what you are talking about"

Re:turbos and carburators
 

try tuning a sled at 10 000 feet when its -40 with gloves on! and ur dropping ---- into the snow never to be found again!

;D

Re:turbos and carburators
 

I was talking about the ones that stick out and wrap around your legs. Post those pics. I love Banshees. ;D
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Re:turbos and carburators
 

word, i lived in idaho, we had sleds break all the time on top of the hill. i didn't care much though, they weren't mine, they were just my ride up to snowboard down.

we had a heli crap out on my buddy on top of the hill once, i have no idea what happened, he dropped us off and never showed up to pick us back up. turns out he couldn't get the thing to start on top of the hill and couldn't come back to get us.

Re:turbos and carburators
 

i would say that turboing a carburated engine is the way to go. you don't have to f-around with the computer or put bigger injectors or any ---- like that. the most you have to do is re-jet them and a lot of carbs don't even have to be taken off the car to do this. ---- i don't have to do a ------- thing except turn up the boost on my turbo.

Re:turbos and carburators
 

Since some of you seem to know so much about turboing a carberated engine. care to fill my in on the avearge engine life cycle of an airplane engine between overhuals. actuall having an aviation tech bitching at home about this sort of ---- sort of enlightens you about these things.

What about aviation grade fuels. standard is low lead 110 octane. so being a bit lean or having a hair to much timing isnt such a big deal. lets talk about compression ratio on planes. 9.0:1 at 10,000 feet is like 6:1 at sea level.

You really want to go down this road go ahead. there is no good way to turbo a carb. sure its been done but its not the best way to fuel the engine. nor is it such a great way to manage spark. If carbs were so great dont you think honda would still be using them or GM or Ford or Nissan or Toyota in Fact harelys now have EFI and to make things even more interesting so do most new planes. No reason to stick with antiqauted technology from 1910.

Re:turbos and carburators
 

I wouldn't say that it's better or your going to ge tmore power out of it but it is so ez to tune. the main reason auto companys use injection is foe emissions.

Re:turbos and carburators
 

actually EFI really got going once auto makers realized engine longevity improved about 300%.

Re:turbos and carburators
 

a lot of good points.

that's a lot easier for someone to read and understand than just simply stating that you feel it's like playing catch with a hand grenade.

i never said it was the best way to go about doing things, i just said it was possible and much easier compared to computer controlled fuel injection, especially OBD2, which i'm currently dealing with right now. i'm not going to run out and carbeurate my every day car, but if i wanted to build something for fun at an absolute cheap budget i'd go with a big edlebrock or holley carbeurator on the intake side of the turbine, it's cheap, not very efficient, but it will produce a lot of power.

anyhow, i think the main question has been answered, i want to see banshee pics.
i'll post one here of my roomates banshee.
it's an old pic, since then he's put on toomey t6's, cut the front fenders off, put on extended front A arms from ALBA i think, and a bunch of other junk. it's a pretty fast bike.

my other roomates quad is an 87 that we just restored, it's still having issues, i'll get pics of it up some time.

Re:turbos and carburators
 

oops, forgot the pic, too lazy to edit. here it is.

http://members.shaw.ca/cua0/images/garagban.jpg

Re:turbos and carburators
 

for what youd spend on a carb i could show you how to do it with factory GM hardware for about $50 minus fuel injectors.

Re:turbos and carburators
 

I'd be intersted in that if I understood that sort of thing. I have heard of this before, but I'm not exactly literate when it comes to programing ECU/ECM's. :-[
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Re:turbos and carburators
 

Sean88:

I think I saw your setup (non i/c-ed accord, gm comp...) a while back when you joined here...

Do you have any details on this setup? I read your website a while back and it didn't give tooo much info (or maybe it was your posts)...

But I'm still curious as to the details / inner workings / complexity of this setup.

Thanks!

Re:turbos and carburators
 

I would be interested in that. I've got a 327 chev that would love to be FI/turbo'd (winter 04-05 project).

Re:turbos and carburators
 

IMO, carbs are ass to use with turbos. They rely on low-pressure fuel pumps so a small pressure change in the fuel relative to the boost pressure can make big changes so you need a good pressure regulator. Then there are the other carb-related issues.
Converting to fuel injection is simple enough, why bother with carbs these days?

Re:turbos and carburators
 

yeah, you need a special regulator to hold the carb's fuel pressure at, i beleve, 6lbs above boost. Carbs usually use 6lbs fuel pressure, so if your boosting 10lbs, your fpr would have to hold 16lbs fp to make the carb function like it does normally... now that i think about this, it's not all too special... a 1:1 regulator.. ha!