Turbos and BlowThru Carbs

[IRONHEAD]

Re: Turbos and BlowThru Carbs

Several guys on here are fans of blow through carbs. I have seen blow through setups run perfect almost half as often as I've seen them run like crap. LOL ;D ;D ;D ;D

I think the safer solution is to use a box instead. Like a Vortech box. The carb doesn't know it's under boost that way, and it's always happy. We've run the Camaro that way, and still do, and it works great.

But, I've known guys that ran less than 10 pounds and just did a hat on a regular carb.No tricks.

what are the seals of the box rated at..
as the throttle cable and trans tv or kick down have to run though a seal of some sort

[seanm]

Re: Turbos and BlowThru Carbs

I've only rebuilt and tuned carbs on my Kohler engine'd lawnmower, my 350cc Yamaha quad, my neighbor's straight six flattie tractor (before we TBId it). So no, haven't done it.

But I never see EFI discussions on Speedtalk, nobody there does EFI except for 3 or 4 guys? I definitely see more talk about carb tuning and, I think there's no doubt it's voodoo meets rocket science.

Thats cool. Just wondered. Wasn't referring to speedtalk about the EFI. Auto forums in general. Theturboforums,com even calls the EFI section the voodoo section, LOL.

Who is Camaro Eric? Would like to know more about his work.

Eric68 on the forums here. Does some interesting fine tuning on carb's.

http://www.bangshift.com/forum/index.php?action=profile;u=32

Thanks, wasn't sure if Camaro Eric was the same as Eric68. Didn't know he did them for others. Thought he did them for himself.

[A/Fuel]

Re: Turbos and BlowThru Carbs

So what is involved in a blow-through carb? I'll guess that you are probably limited on boost by fuel pressure for one, and you probably have change your power valve.

[TC]

Re: Turbos and BlowThru Carbs

The Ebay blowthru carbs I'm talking about are brand new Demon carbs setup by Demon to be a blowthru carb. I will probably go this way since I'll have to buy a carb anyways.

Also in that CC article after fixing the wastegates, they pumped 22lbs of boost through that carb, which is probably more boost than even I am thinking of running. ;)

[milner351]

Re: Turbos and BlowThru Carbs

I've never had a blow through carb, but I've had two demons - make sure the one you buy has the "idle eeze" feature in the center of the base plate - it's an additional idle air adjustment screw right in the middle of the base plate accessed through the air cleaner stud hole from the top.

The carb I had with that additinal idle air screw idled and ran great (on my cleveland - not on Seths 454+.030)

The one I had without it - didn't - all else being equal (carb part number, jetting power valves, etc, etc)

[CTX-SLPR]

Re: Turbos and BlowThru Carbs

Doesn't TC have a Turbocoupe already?

[Bamfster]

Re: Turbos and BlowThru Carbs

What about vacuum secondary carbs ... are they a big no-no for a blow thru app?

[joe_rocket45]

Re: Turbos and BlowThru Carbs

they can't open..... the pressure differential from inside the carb to the outside air pressure prevents it. with a carb box they probably work well

[TC]

Re: Turbos and BlowThru Carbs

Doesn't TC have a Turbocoupe already?

I do, but twin turbo'd V8's are cool. ;)

And hell I already spend enough money on the wife and kids, another car/project can hurt, can it?? ;D

[SpiderGearsMan]

Re: Turbos and BlowThru Carbs

cheaper than efi , less hassle more power
no search engineer needed

http://www.candsspecialties.com/store/html/blowthru.html

[Brian Lohnes]

Re: Turbos and BlowThru Carbs

Keith and Tonya will be hauling ass with their "boxed" blow through at Loring next weekend.

I'll be watching and helping. It'll be cool to do some hands on learning.

Brian

[Scott Liggett]

Re: Turbos and BlowThru Carbs

Keith and Tonya will be hauling ass with their "boxed" blow through at Loring next weekend.

I'll be watching and helping. It'll be cool to do some hands on learning.

Brian

Watch out for that Keith fella. He'll start talking and next thing you know, you learned something. He's very sneaky that way.

[Memphis]

Re: Turbos and BlowThru Carbs

Do you read Speedtalk forums Sean? Look at the details thoseguys are going through for blowthru carbs. Any person would be CRAZY to even think of implying that an EFI system is more complicated. And, if they did, that person would need to remember that "EFI" actually means "Powertrain Management" - take away all the extras that EFI gives you - say you're running a "fuel only" EFI system, not timing, not fans, not fuel pump, no barometric corrections, no datalogging - the EFI system is FAR less complicated, and FAR Less "guesswork." There are guys with very fast blowthru cars arguing different methods for accomplishing the same thing - it's not just rocket science, it's voodoo art.


edit: all that being said, I enjoy reading about how the voodoo works, so... don't let me convince TC he needs to do a EFI setup. lol

Who said carbs were better than EFI or easier to tune at 30 psi? Definitely not me. They both suck, IMO. ;D When they build a $50 dollar bolt-on part that can make 3000hp and tune itself with 0-400psi I'll be happy.

Have been on Speedtalk, what you see about carbs I've seen about EFI. I see guys posting about all the crazy problems and tuning difficulties they have with EFI (personally dealing with it now, as you know) and it looks about the same as the carb guys to me. They each use different terms, but have the same problems.

So have you built or tuned blow-through carbs? That was my question. What you posted before sounded like personal experience and led me to believe you had done some carbs to. Who is Camaro Eric? Would like to know more about his work.

Either way, will TC ever get this done? ;D

TC: On the carb, you can do it yourself if you want to take the time to learn. Or have someone do the carb. If your looking for 10-15 psi and don't mind playing with it, do it yourself, IMO. It may not be perfect, but it should run decent if you know your way around a carb.

I don't know about the blow-throughs on Ebay. There are a few places that have done well with them if you want to have a carb professionally done. But that goes against the cheap side of it.

CSU: http://www.csucarbs.com/

C&S: http://www.candsspecialties.com/

Brent Davis is also well respected for his blo-thru carb work.

Another one to add to the list of people he could go to is Steve Morris. I recall a build of his where he made 2000hp on pump with a blow through, cool beans

[seanm]

Re: Turbos and BlowThru Carbs

Steve Morris is a good guy. He uses CSU and C&S for his carbs. He has some tuning videos here: http://www.boost-tek.com/tuning-videos-1.html

[CDMBill]

Re: Turbos and BlowThru Carbs

Apropos of nothing, but Morris & Co. had that 2000 HP Pro charger blown 572 BBC wagon at the '05 DW and it was completely sick. It sounded like a TF car echoing of the trees before it pushed a rod out of the block.