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Old 09-14-2019, 06:18 PM   #1
ant447
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Default Blow thru vs efi

Sbf with F3 procharger on M1. Is it worth the expense of efi vs a good blow thru carb? I already have an msd grid and datalogger in car for everything needed. Was looking at CSU and APD for blow thru carb. I'm sure there are other good ones also? I'm sure on turbos they would be more finicky for spooling and making boost
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Old 09-14-2019, 06:32 PM   #2
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Default Re: Blow thru vs efi

I can only speak on what I've seen, but local racer/no prep is running out of fuel on APD blow thru deal. So much so they put a fuel block in front of the carb and ran fuel lines to the intake to add the extra fuel. It's turned on by a nitrous solenoid and a rpm window switch. He is at 2000+ hp. He is looking at making the efi switch. Guess it depends on what kind of power you are looking to make.
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Old 09-14-2019, 06:42 PM   #3
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Default Re: Blow thru vs efi

Don't overlook MFI. I run it on my F3-139 ProCharged dragster. Car will run 5.80's at 240 plus if I lean on it.
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Old 09-14-2019, 08:48 PM   #4
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Default Re: Blow thru vs efi

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Originally Posted by GTAShief View Post
I can only speak on what I've seen, but local racer/no prep is running out of fuel on APD blow thru deal. So much so they put a fuel block in front of the carb and ran fuel lines to the intake to add the extra fuel. It's turned on by a nitrous solenoid and a rpm window switch. He is at 2000+ hp. He is looking at making the efi switch. Guess it depends on what kind of power you are looking to make.
Are you talking about Tim brown by any chance?
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Old 09-14-2019, 09:17 PM   #5
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Are you talking about Tim brown by any chance?
Yeah. We were with him last Sat at Kil Kare. We've raced with him for awhile. And I've known Larry H. since I was a kid. (Tim's engine/fab guy).
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Old 09-14-2019, 10:07 PM   #6
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2000 to 2500hp
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Old 09-14-2019, 10:08 PM   #7
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Apd swears they have up to 3000hp
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Old 09-15-2019, 10:09 AM   #8
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Default Re: Blow thru vs efi

Blow-thrus have their place , but have no fail safes .

Sometimes when blow-thrus lose fuel , they go so lean the motor cant run and pistons are saved .

sometimes not .

Last edited by boostedbowtie; 09-15-2019 at 10:11 AM.
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Old 09-15-2019, 12:18 PM   #9
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Quote:
Originally Posted by GTAShief View Post
I can only speak on what I've seen, but local racer/no prep is running out of fuel on APD blow thru deal. So much so they put a fuel block in front of the carb and ran fuel lines to the intake to add the extra fuel. It's turned on by a nitrous solenoid and a rpm window switch. He is at 2000+ hp. He is looking at making the efi switch. Guess it depends on what kind of power you are looking to make.
Apd couldn't fix the problem in the carb?
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Old 09-15-2019, 01:46 PM   #10
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Default Re: Blow thru vs efi

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Apd couldn't fix the problem in the carb?
I'm honestly not sure what the problem is other than he said the carb wouldn't flow enough. He builds engines and has a engine dyno and a couple years on the setup so I would think he has talked to them.
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Old 09-15-2019, 06:08 PM   #11
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They said their newest stuff is good to 3000 hp. Maybe that is an older carb? I would like to hear if anyone has good success stories with theirs or anyone else's?
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Old 09-15-2019, 06:51 PM   #12
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Default Re: Blow thru vs efi

Properly built blow-thru carbs are hard to beat, regardless of the application. Also, K&N has a fairly new product that has not been marketed to racers yet that is VERY good for carbureted engines. I've worked with several now and it will soon become a must-have for high HP engines with carburetors regardless of the fuel and power adder. It has an easy to program ECU that is an AFR-controlled fuel supplement system. Simple, effective and inexpensive. They've only marketed to the street rod market so far but it's a no-brainer for racing... https://www.knfilters.com/eci
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Old 09-15-2019, 07:15 PM   #13
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Default Re: Blow thru vs efi

The last blow through I looked at was a TD and it had separate pressure regulators and 4 hoses feeding the carb and all kinds of coolness supporting the pro-charger. Just looking at this guys setup, it appears the price gap between EFI and a complete blow through setup has lowered considerably.



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Old 09-15-2019, 07:39 PM   #14
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Default Re: Blow thru vs efi

Travis Quillen does a mechanical system that is night and day ahead of any blow thru alcohol setup. Couple that with a Haltech VMS for your dash, logging, engine timing control and ignition (if you choose COP). Your way ahead and wont melt pistons all the time like blow thru alky does above 2000hp without additional mechanical enrichment nozzles in the runners.........
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Old 09-15-2019, 07:42 PM   #15
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Default Re: Blow thru vs efi

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Originally Posted by ant447 View Post
They said their newest stuff is good to 3000 hp. Maybe that is an older carb? I would like to hear if anyone has good success stories with theirs or anyone else's?
I would say show me the Dyno video and data sheets on a 3000 hp alcohol blow thru carb. Been running a F3-139 since 2005 , with a blow thru carb tell about 2015. Lots of BS out there about alcohol blow thru's. Getting that much fuel volume through a carb is a major challenge,....properly metered.
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