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DRR Trophy |
Thanks for watching and the feedback. This video is from earlier in the year when it was running better. https://youtu.be/nNJl8Qzl4d4 | |||
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DRR Top Comp |
Have you got a engine rpm graph from before you changed the bypass pressure, you can post? Any difference in that graph? | |||
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DRR S/Pro |
Sounds high to me,,, warmups need a lean out valve or even a primer plus system that allows you to warm up on gas and also just before you put it away for the day. With the car idling slowing increase rpm and note at what rpm the boosters begin to flow fuel. High floats will start flowing fuel much earlier than normal and you will use much more fuel than you should. If you carb is relatively new, your floats are likely ok. What normally occurs is as the floats become heavier due to fuel soak, the fuel level rises in the bowls, without knowing, racers readjust the floats, this reduces float drop which restricts fuel flow at WOT which causes a lean condition to occur. | |||
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DRR Trophy |
Mike, No graph handy on the bypass pressure change. We changed it in the pits yesterday between 2nd TT and First round. Car ran the same et... I have the graphs at home just not with me. That said apples to apples it was the same. | |||
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DRR Pro |
that fuel system will not run my alky setup,i did try it before going back to a belt drive system honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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DRR Trophy |
On the fuel usage thing we have the lean out plumbed with 1/4" line. I am getting the stuff to change it over to 1/2" line for this weekend as 1/4" it won't even speed the engine up with it open. We did check the float levels at the track and they didn't raise any red flags. the back was a bit high and front was right on. It's easy enough to pull the float bowls and check them out though! | |||
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DRR Trophy |
How fast were you running at the time? I do feel like the car should run faster than it does even when running good, but I also see guys running an Aeromotive setup going 4.60's with an electric pump. I am torn on this. | |||
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DRR S/Pro |
The air bleed lean out deal works but if it raise the rpm high enough to start fuel flowing from the boosters your defeating the goal. With alky, you need to put the motor away hot, especially in the spring and fall, akly attracts water and if the car sits for any time it will rust the cylinders, more of an issue with a rich cool running motor also. The Primer Plus deal works great to eliminate this issue along with cool morning start ups. You will like save the cost of it in alky is a short period. | |||
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DRR Trophy |
It has a bad fuel line/fitting on it. Which one? I have no idea. You got a bad fuel line Corey. I have no clue which one.[/QUOTE] Mike, what do you think is happening to the lines? Collapsing under vacuum? Just curious, I have seen that a lot in hydraulic systems and fuel could possibly do same thing. | |||
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DRR Top Comp |
Very true, unfortunately mostly only those who have been demonstrated the phenomenon your speaking of, will follow this point. The lean out can trash the oil wash the bearings if not used properly. I've seen it. | |||
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DRR Pro |
honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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DRR Trophy |
I never ran more than 7 pounds. Even when I had my dragster with a 582 running 4.60 I ran 7 pounds. I do think belt drive systems are better. | |||
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DRR Trophy |
Thanks everyone for the feedback. I have an update...well sort of. At the start of the season, a few races in we had a fuel pump issue. Long story short we were aerating our fuel and had to change our return line in the tank. When we put it back together we added a fitting to the bottom of the regulator to check pump bypass pressure. In doing so we may have created this issue. The line from the pump to the regulator has a nice twist to it now. See the photo below. We think this may be our culprit and will be re-plumbing this to see. We are most likely going to be changing the lines out of the regulator to the carb as well, mainly for piece of mind. What do you guys think? Smoking gun? | |||
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DRR Top Comp |
Yep, new hose AND new Russell fittings. You're half way there on the Russell fittings looks like (have a few already). | |||
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DRR Top Comp |
I wouldn't F around with it. Nothing worse than burning fuel for nothing. This (below) is burning fuel for nothing | |||
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DRR Trophy |
Update on this. First off, thanks to everyone that pitched in and gave me some suggestions. Here is what we did. Took the Magna fuel stuff off, and went to APD. Bought a belt drive pump, fuel log, regulator and gear for the crank mandrel. Re-plumbed per their instructions. Set fuel pressure per their instructions. Hauled butt. Car went from 4.98 at 136 last time out to 4.90 at 141 yesterday. Here are some photos for reference. Very pleased with the results for now. Water temp didn't climb during the run either. What it was staged at was what it was when it got back to the trailer. Hardly ran the fan at all. I still think it should be going faster with that mph. We will be borrowing a convertor from a friend for the coming weekend and making some shock changes as well. Will see if we can get it into the low 4.80's before the end of the year. | |||
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DRR Top Comp |
Good deal Gold piggy back canisters, with separating piston inside still, LMP? | |||
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DRR Sportsman |
Take belt off vaccum pump and listen for the vanes clicking as you spin it. If not you may have some stuck vanes and that will slow you down. Just something to check and rule out. Jeff McClure | |||
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DRR Pro |
Your weather station is broken as well, it is not possible to have barometric pressure over 30.30 unless you are racing under the ocean. For reference, 29.92 is sea level. I would not run alcohol with an electric pump either, glad you changed it. Crew Chief Pro 7.980. It is not an evolution in Crew Chief Software, it is a Revolution in Crew Chief Software Drag Racing Software and Professional Weather Stations(309) 688-2990 Visit us on the web at http://www.crewchiefpro.com Are you a Producer or a Parasite? Author of the book, "But Who Will Save The Children." | |||
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DRR Trophy |
Mike, It has Penske doubles on the back. Qa1 on the front suspension (Diamond double suspended car). When we bought the car, the other guy had a 632 in it with an aluminum block. We have never turned a knob on any of the dampers. I'm sure it needs tweaking! Jeff, We will check out the vacuum pump for sure. Good idea and something that is easy to check and easy to over look. Don, I am pretty sure you are probably right. I am using a TAG hand held from the 90's. First gen to boot. Have had it forever. One of these days we will update to a trailer unit like you sell. Thanks for the feedback! I appreciate it! | |||
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