Blow Through Carb
Thread Starter
Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
Blow Through Carb Greetings everyone. I am going to run a CSU carb with my turbo and plan to talk to them in the next couple of weeks. I've researched quite a bit, but haven't found a lot. Obviously, most people run EFI, etc.
I ran across a video where a guy said not to use a single fuel log. You should run two lines from your reg, one to each of the fuel bowls on your carb. What do you say that have run a blow through setup? I have the aeromotive 13304 which has one line in from fuel pump, and the one line out to the carb and one port out for the return line. So, if I need to run two lines to my carb, I need to get a different reg, or run a T which I don't want to do.
The other question I have is where to take the MAP reading from. There is a 3/8 port on one of the intake runners on my Vic, jr, but having some trouble finding a fitting that is 3/8 npt and then will fit the plastic line for the MSD 6014 that goes to the MAP input on the box. There is also a 1/4 npt on the side of the intake that would read from right under the carb.
Any other do's and don't's from people who have run or are running blow through carbs on their turbo motors is greatly appreciated!
I am aware of the advantages of an EFI setup, but I want to run a carb. This car will be 98% race and 2% street.
Thanks!.
I ran across a video where a guy said not to use a single fuel log. You should run two lines from your reg, one to each of the fuel bowls on your carb. What do you say that have run a blow through setup? I have the aeromotive 13304 which has one line in from fuel pump, and the one line out to the carb and one port out for the return line. So, if I need to run two lines to my carb, I need to get a different reg, or run a T which I don't want to do.
The other question I have is where to take the MAP reading from. There is a 3/8 port on one of the intake runners on my Vic, jr, but having some trouble finding a fitting that is 3/8 npt and then will fit the plastic line for the MSD 6014 that goes to the MAP input on the box. There is also a 1/4 npt on the side of the intake that would read from right under the carb.
Any other do's and don't's from people who have run or are running blow through carbs on their turbo motors is greatly appreciated!
I am aware of the advantages of an EFI setup, but I want to run a carb. This car will be 98% race and 2% street.
Thanks!.
Last edited by 07GTLS; Feb 18, 2023 at 04:00 PM.
Staging Lane
Joined: Dec 2016
Posts: 82
Likes: 3
I sent my 650 cfm carb into CSU and had it converted to blow through. I also got one of their bonnets. I haven't got my 5.3l running yet but what im doing is running a pressure regulator off the back of my fuel rail on the return line. Tht way i have no restricted flow from the pump. But can control the fuel pressure by how much i return to the tank. I'd run a big fuel return line if u do it tht way. As far as the map sensor im just going to run a multiple port manifold split off my brake booster hose and attach the map sensor there. That way i still have the big hose for the booster and multiple lines for other things "boost gauge". My fuel pressure regulator boost reference im planning on installing a plug in the carb bonnet. My 2 cents
Thread Starter
Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
Great, thanks!
What fuel pump are you running? I am running the magna fuel pro tuner 625 (mp-4301). I was going to run an A1000 but then found out I'd need a fuel pump controller, etc., if I were going to run it for more than 30 minutes at a time, and even though my car is mainly for racing, I do want to be able to drive it too.
Oh man, I totally forgot about my brake booster, lol. What fitting or T are you using that you can also run the 1/4" pnuematic line for the MAP sensor to? Are you running the 6014 box?
What fuel pump are you running? I am running the magna fuel pro tuner 625 (mp-4301). I was going to run an A1000 but then found out I'd need a fuel pump controller, etc., if I were going to run it for more than 30 minutes at a time, and even though my car is mainly for racing, I do want to be able to drive it too.
Oh man, I totally forgot about my brake booster, lol. What fitting or T are you using that you can also run the 1/4" pnuematic line for the MAP sensor to? Are you running the 6014 box?
Staging Lane
Joined: Dec 2016
Posts: 82
Likes: 3
I haven't gotten my fuel pump yet. I was thinking magna fuel possibly. UPR makes an aluminum vacuum manifold block with six 1/4" ports and two 3/8" ports. I was just gonna to run my brake booster line in one end. Out the other end to the carb. Than the six 1/4" ports to boost gauge and whtever else. Plug the unused ones. I have a 6014 box on it to.
I ran a bunch of blowthrus back when, I liked them, lol. If you only have one outlet on the reg, run a #8 to a larger like log, #8's to the carb. They sell some diff ones for that. Don't forget to boost ref the reg, I usually tapped the carb hat for that, rather than a boost/vac line. I never ran the 1014 box, so didn't use MAP, but anywhere beyond the carb that has boost/vac you can install a MAP sensor. You want to run a timing retard, but on the 6010 box I just used the timing graph and ramped it down as it saw boost. You want to monitor your AFR's also, something with an 02 sensor. K & N made a cool looking deal, it was a nitrous plate like thing under the carb, had a control box, and an 02 sensor. it could add fuel based off the AFR's, always thought it could be cool on a blowthru. I ran an A1000, worked well, but there are others, some have a return on them, so you can use another reg to get the pressure down further. Kevin (CSU) used to have some on his site.
Thread Starter
Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
I have a russel fuel log/line that is all -8, and so I had planned to run the -8 line from reg to that. Do you think this would work for 800 to the wheels? fuel line
Yes, it's a boost referenced reg.
I was going to run my AFR sensor in my downpipe. I was going to use carb hat for fuel reg, and manifold for ignition boost reference, the manifold for BOV, and the turbo housing for wastegate.
Do you think the race carb hat is a must have? Or is the shorter one fine for what I am doing? Not sure where hood clearance will end up, but I don't want to run anything more than a 3" cowl hood. The CSU is 4" tall, and I see some people use a 2" spacer even. What do you think?
Yes, it's a boost referenced reg.
I was going to run my AFR sensor in my downpipe. I was going to use carb hat for fuel reg, and manifold for ignition boost reference, the manifold for BOV, and the turbo housing for wastegate.
Do you think the race carb hat is a must have? Or is the shorter one fine for what I am doing? Not sure where hood clearance will end up, but I don't want to run anything more than a 3" cowl hood. The CSU is 4" tall, and I see some people use a 2" spacer even. What do you think?
Last edited by 07GTLS; Feb 19, 2023 at 08:45 PM.
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Staging Lane
Joined: Dec 2016
Posts: 82
Likes: 3
Those CSU bonnets have been used on 1600+ hp engines. I think the pro charger and extreme velocities work pretty good also. Idk how much power you would lose by going to a shorter one. The spacer plates are good for building torque.
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Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
Won't make too much difference I suppose. A few years ago (like 15 lol) I picked up 10 hp up top on my 427 BBC *525 hp/545tq) on an engine dyno with a 1" spacer, and then another 10 hp with a 1/2" spacer between the carb and the air cleaner, iirc. We were pretty surprised with that.
When I am ready, I will talk to Kevin at CSU and basically do all this stuff however he tells me to do it. I like to be well-informed going in. Really appreciate feedback and ideas.
When I am ready, I will talk to Kevin at CSU and basically do all this stuff however he tells me to do it. I like to be well-informed going in. Really appreciate feedback and ideas.
Last edited by 07GTLS; Feb 19, 2023 at 08:47 PM.
What I experienced was using one of the short hats, the engine would hit a flat spot around 4500, then pick up again. I swapped it out for a taller hat, it cured the problem. The EV hats work well, give a little more clearance where the front is angled down. All my blowthrus were Procharged, prob a turbo is slightly different as the power hits a little different, but would be fun to try, lol. One of the cars I built had a 540/F2, def was a torgue monster, lol.
Thread Starter
Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
540/F2, dang! I was going to go with a D1X but the turbo setup was less than half the price, and I've never built a turbo car, so I thought it would be fun. But still love the old 4150, so decided to buck the trend and go blow through. I mean, I am putting an LS in an 07 mustang, so might as well stick with the theme, lol.
I will check out the EV hats.
I will check out the EV hats.
I ran a Horsepower Innovations E85 carb, extreme velocity carb hat, with a 2" spacer. Eric at HP Innovations advised me to clock my hat straight forward or straight back, and avoid angles since it "could" cause signal issues in the carb. I ran dual feeds to the carb, aeormotive regulator, magnafuel protuner 750 pump. Basically Eric built the carb, I followed his and magnafuels guidance on fuel delivery and so on, everything worked flawlessly.
Thread Starter
Staging Lane
Joined: Nov 2022
Posts: 92
Likes: 21
Thanks for the info! Where did you get your boost reference for your wastegate from?
Do you recall which regulator? -6 or -8 lines out to the carb?
I am sure that setup ran nice and cool with a carb and E85.
Do you recall which regulator? -6 or -8 lines out to the carb?
I am sure that setup ran nice and cool with a carb and E85.