Blow through carb folks; what is/was wrong with yours..
#1107624
11/05/11 03:46 PM
11/05/11 03:46 PM
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Joined: Jan 2003
Posts: 1,030 JAX FLA
Curt
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,030
JAX FLA
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I, and many others, have heard that blow through set-ups are not worth messing with. I would like some straight facts (AS SPECIFIC AS POSSIBLE) about what it took to make you happy. I built my car and could point out a million flaws with it...I am asking you guys to be critical about your set-ups. Other people saying "It won't work" just bugs me. Is it cold start, hot start, off idle (high vacuum), 0 vacuum ;boost transitioning, mixture distribution, accel pump problems....WHAT? I realize there is additional effort in tuning, and even that most Holleys (that I have seen at least) do not run the same, day to day, so.... what say you? Thanks Curt
Oh yeah...THAT'S gonna leave a mark!
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: SLOW67]
#1107627
11/07/11 10:32 AM
11/07/11 10:32 AM
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Joined: May 2008
Posts: 1,238 North Cackilacky
sdaurity
pro stock
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pro stock
Joined: May 2008
Posts: 1,238
North Cackilacky
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Mine didn't run bad at WOT, had a very nice a/f through. I only had 2 complaints with it. When trying to spool a larger turbo it was always fat at part throtle and could never get the a/f lean enough to get alot of turbo speed. And the first time you make a pass with fuel injection and get to see and use all the data from the pass, you will wonder why you ever spent money on the carb. IMHO Having both, I would never put a blow thru on anything again, just being able to change anything you want with a few key strokes is flat out awesome. In other words the carb worked great, ran good but the fuel injection is just leaps and bounds better.
One day I will have something cool here.
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: Curt]
#1107628
11/07/11 12:40 PM
11/07/11 12:40 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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I sent mine to Scott at SDCE http://www.sd-concepts.com/pages/cfHome.cfmThing worked right out of the box> Buddy runs a W5 headed SB at 170mph+ w/ a blow thru and 17lbs of boost no problems... seems to work just fine
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: quick77rt ]
#1107631
11/10/11 08:48 PM
11/10/11 08:48 PM
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Joined: Jan 2003
Posts: 1,030 JAX FLA
Curt
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,030
JAX FLA
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Just having a problem with 3k plus injectors to get a 3G hemi going.... close to 2 times the cost of carbed... Curt
Oh yeah...THAT'S gonna leave a mark!
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Re: Blow through carb folks; what is/was wrong with you
[Re: dodgeboy11]
#1107633
11/16/11 03:01 AM
11/16/11 03:01 AM
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Joined: Jan 2003
Posts: 2,697 Renton Wa
topfueldart
master
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master
Joined: Jan 2003
Posts: 2,697
Renton Wa
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Mine works killer. Homebuilt, 650 DP. No mods to pvcr's or bleeds. I honestly believe in my case and others below 370" or so the 650 is the way to fly. Smaller venturis maybe pull harder out of the boosters? My car is jetted up 3/7 I think, (off the head, but it's been awhile, don't hold me to it, like 75/81)and has AFR's right around 12:1 at 13lbs of boost on pump 92. Made 400 to the tires with a very stock 318 and went 120 in the 1/4 at 3500 race weight.
A guy named Ira on theturboforums went like 5.80's on a 650 carb and a 355 with an ancient TV8101 single turbo.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: Curt]
#1107634
11/16/11 08:57 PM
11/16/11 08:57 PM
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Joined: Jan 2003
Posts: 28,068 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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What do you want to do with it? A pure race carb is easy. A street/strip carb is a PITA.
A carb can only sense air velocity. It can't sense air density. You can tune well for one or the other but it's physically impossible for a carb to be tuned perfectly for both. A good balance can be found but you really have to know what you're doing and there will always be a sacrifice.
I borrowed a Holley tuned by SDCE and it worked well. Anytime I needed more than the primaries open but less than medium boost it felt flat. There was just a hole in the tuning. The AFB I had worked great for street use but couldn't keep up under boost. I ended up jetting the secondaries rich and running an additional injector.
Once I went EFI, I couldn't believe I fought with a carb for that long. I will not go blow through again.
If it's a street/strip car, I'd suggest doing what you can now to get you by and saving your money for a decent EFI system. You can get into them for minimal cost if you shop wisely. I bought my controller and many components used off eBag.
If you're building a drag car, have at it with the carb.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: feets]
#1107635
11/17/11 10:58 AM
11/17/11 10:58 AM
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Joined: Jul 2010
Posts: 197 New York
Dustin71
member
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member
Joined: Jul 2010
Posts: 197
New York
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Good Morning Fellas !!! This topic is making me SAD... I my self is collecting all my Turbo Stuff to switch over from a Nitrous Additive (440...30over...9to-1comp....Stealth home ported heads.....Victor intake port matched to heads....W/a Fogger sys.......in an a Body running high nines .........to a Turbo set up... Now i read this so i'm sad.... would i improve the E.T. by swithing to a 88mm Turbo set up Intercooled air to air Blowthrow?... Sorry to crash the topic but it has my FULL attention
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: Dustin71]
#1107636
11/17/11 02:31 PM
11/17/11 02:31 PM
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Joined: Jan 2003
Posts: 28,068 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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A blow through is fine for a drag car. You don't need to worry about drivability concers while cruising.
You might need a cam change but the turbo will be easier on your engine than the bottle.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Blow through carb folks; what is/was wrong with yours..
[Re: feets]
#1107637
11/17/11 04:18 PM
11/17/11 04:18 PM
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Joined: Dec 2006
Posts: 214 Colo Springs, CO
DconD100
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 214
Colo Springs, CO
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I agree with the whole fuel injection for the street vehicle, BUT it isn't impossible to make a carb work well. I admit that I am probably a bit more accepting of small driveability issues when it comes to my daily driver, but my procharged 71 dart is a whole bunch more driver friendly than some of my past N/A vehicles.
I have a 408 with a P600B, self ported Edelbrock heads, hydaulic flat tappet cam, intercooler, 750 quickfuel mainbodied 4150 with E85 metering blocks. It will only make 6 pounds spinning the blower to it's max rpm, but it runs 10.70s @ 127mph with 3.55s all day long. It took a while to fine tune the air bleeds to keep the wideband reading consistant for idle, cruise, and WOT...but, I kinda enjoy that part of the process. It also took some ingeuity to figure out a fuel supply sytem that would feed enough E85 to the engine through single needle and seat float bowls!
Keep in mind that I race at 8500+ feet DA, and drive it to work at 6500ft elevation. For a fairly tame 3600 pound car it is very driver friendly...instant response without any hesitation, no blubbering, and idles pretty decent at 800rpm at the stop lights.
Don't get me wrong, if somebody gave my a nice multiport fuel injection setup I would swap my carb out in a heartbeat!
Pump Gas Small Blocks Rock!
11.53 @ 116mph E85 408 at 8500 ft da,
3605 pound truck, 3.91s, street driven
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