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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi The bracket racing superchargerGo | New | Find | Notify | Tools | Reply | |
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DRR Sportsman |
Can someone please school me on what it seems like a bunch of guys are bolting on their cars and picking up 3 tenths in the eight mile ? TBS 250 maybe ? A few of us are very curious what it takes to de this. TIA | ||
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DRR Trophy |
That's exactly it.. Can take a 4.90 motor with 14.5:1 compression and slap on a TBS 250 blower and with around 4 lbs of boost go .50's and .60's... Major concerns would be room in the car for it.. Nick Craig 1971 Camaro Split Bumper 376ci LS3 | |||
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| DRR Pro |
This is the place. These guys are very helpful http://www.alkydigger.net/prod...il.php?prod=TBS-3125 -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93  www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR S/Pro |
Also all depends on whether you want to run a carb or injection. For injection I would contact James Monroe at http://www.killerrons.com/16.cfm. They have a turn key package for bracket racing. I know several that have used their setup and printing tickets running 4.30s-4.50 bracket racing. Just be mindful with any blower if you want to bolt it onto an existing 14-15:1 comp bracket motor, compression in this range will limit your boost and tuning window will be very narrow, I would suggest you get down in the 12:1 range if possible for that reason | |||
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DRR Top Comp |
I think to do it right there is more than just bolting on a blower. You should have double keyed crank and few have that with out special order. Also yes you can run 13 or 14 to 1 compression but it should really be lower. Also many are saying you will break the crank with out a crank support up front. Others say it is not needed but regardless there is a bunch of broken cranks. Also many say you must have the block O-Ringed or it will lose head gaskets. Valve train must be good and solid to handle the boost. If you have a small block SBC you really should have the BBC crank snout on it to help durability. Low boost you may be able to get away with it but not for high HP. With wide lower pulley it is hard to run alternator, mechanical fuel pumps, vacuum pumps etc. Also the blower takes about 1/3 of the horsepower it makes to run the blower. So if you are putting out 1200 at the crankshaft the rods, pistons, crank and fuel consumption may be closer to 1800 Hp. The more horsepower you make the harder it is on rotating assembly so it just will not last as long. Can your rotating assembly handle that much power? Blowers make good horsepower for sure but it comes at a cost, nothing is free. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR Top Comp |
Lots of times a blown motor will make more power w/o hurting parts with lower compression. While you may get away with 14:1 and good amount of boost.A 12:1 will make same power even if you have to bump the boost a little and you will have larger tuning window and no where near as hard on parts. Hell I just need a race 6-71 and I can play.Have everything else. Wait I would need smaller pulleys mine only go 50% to 65% od.LOL Running mechanical pump is no problem with large pulley.Simply run in cam mounted with extension. America home of free. Brought to you by 2nd amendment. | |||
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| DRR Sportsman |
Even with this little blower ? Now I'm scared. | |||
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| DRR Elite |
Well, I don't know details about it nor am I a blower expert. But as far as boost.... I do agree that the high compression can ruin your day. But on methanol, you lower down to 12.5:1 with a good gasket, and don't get greedy with the boost/power, and it can pick up nicely and be consistent and reliable. I can't say about the snout. But yes remember that you will make more power than you get to use. So your stuff needs to be up to snuff. Warning: Just like everyone says, it's addictive. I was going to be thrilled with 7.20's. And I ran teens once, and now I want to see a 6 number before the season's end and be able to get into all the quick 8 races locally. If I would quit wanting to go fast, this would be easy and I could be going more rounds than I am. But it's an awful lot of fun! I found that low boost picks up the car way more per psi than high boost. And it is uber easy on parts and the tuneup on methanol and low boost is really forgiving. Most of my gains were at 12 psi and less. the gains are smaller and less efficient as you demand more. Foxtrot Juliet Bravo | |||
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DRR S/Pro |
Talk to people actually doing it before you give up on the idea. ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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| DRR S/Pro |
I bracket raced a blower for several years and it was very consistent, never really had any issues. 13.1 cr shouldn’t be a issue at lower boost levels. Tuning window gets small with a lot of boost. J.R. Baxter ""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen." 2024 Miller Rolla Competition Engines ProCharger Hoosier Tires Abruzzi | |||
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| DRR Top Comp |
I agree it can be done but just warning you of some of the problems. The lower the horsepower less likely you are to have those problems. But then you are wanting to go to a blower to make more power RIGHT? https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Top Comp |
since that blower is two lobe and straight lobe I doubt it has near as much drag on power or strain on crank. Now if its a hi helix 14-71 that takes around 350 hp to spin it,that would be whole different world. Making more power is going to stress parts no matter how you get there. Heck I know guys who just swapped to better blower and started breaking parts that where fine before. America home of free. Brought to you by 2nd amendment. | |||
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| DRR Pro |
With these small blowers most people are in the 4-5 psi range. The guy that I talked to said its roughly 60hp per 1psi. He said these little 250 blowers are capable of 10psi but not on a high compression engine. If you are looking to pick up .3 or so seems pretty easy. I've sprayed 300hp for years with all the same internals and never had a problem. If you get greedy it will bite you just like anything. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 www.apdracing.com www.diamondracecars.com www.callies.com | |||
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| DRR Trophy |
I have wondered about the set up on the front of the engine, are people running alternators,vacuum pump what about a belt driven fuel pump ? i assume a remote water pump set up, | |||
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| DRR Pro |
I have friends with these setups running all the same stuff. I know with the 250 blower they sell a spacer kit for mandrel drive so you can still run all your stuff. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 www.apdracing.com www.diamondracecars.com www.callies.com | |||
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| DRR Sportsman |
I have a 15 to 1 632 with a single gas carb. Nothing fancy. Great bracket car. Figured I try something to mess it up, like I always do. | |||
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| DRR Top Comp |
I would look inmto thicker gaskets or pistons with 15:1. If going with these small blowers which will make less boost on bigger engine I would shoot for 13:1 tops if swapping pistons. I doubt youy can get that low with just gaskets. Do not know what yopu are making now. But remember that 250 hp on a 750(33%) hp motor is bigger jump than 250 on a 1250(20%),so should mean lot less increase in wear. JMOThis message has been edited. Last edited by: wideopen231, America home of free. Brought to you by 2nd amendment. | |||
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DRR / Crew |
The guys at Alky Digger are about 30 minutes from my house. Very nice group. Just ordered a bunch of our Blower Filler Necks. SL... | |||
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| DRR S/Pro |
Bob, I like your style. ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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| DRR Trophy |
Just noticed James has removed his blower from his dragster at the bracket finals, going from 4.50's 4.60's to 5.55 that's a change. | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi The bracket racing supercharger
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