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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#41
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Rumors have the Hellephant crate 426 in the $50K ish neighborhood. I will build mine, which will have better internal dimensions and better reciprocating parts for under $35K. And recoup around $12.5K when I sell the complete, low mileage (<4000) modded 800+ RWHP 6.2L. Not so bad. |
#42
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#43
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YAWN.
Red 114 racing fuel? Anybody can do it with 19psi and hi octane fuel. Ill get better than that HP on pump. Sit back and watch. |
#44
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93 or E85? |
#45
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The Chrysler info says the Demon Supercharger is a 2.7L per revolution unit.
They also say it can move 33000 liters of air in a minute. Simple math say at 14.5 psi they are spinning the supercharger 12,222 supercharger rpm. Not a big rpm number like a Lysholm Screw Supercharger (18,000) but still a very respectable supercharger rpm. The Liters per minute or airflow works out to about a 1165 cfm supercharger unit. 1165 cfm (assuming a 12.4 air/ fuel ratio) says they are playing it a bit safe on the tune-up. Being a drag race crate engine they can get away without running Stoichometry. And they have a good EFI system so 12.4 is a safe number for 14.5 psi of boost. The Supercharger, based again on simple math, says that the supercharger is taking away about 100 hp from the Engine HP number and that lower HP number is feeding the transmission. Looks like you have a good S/C unit there Tom Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#46
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I already use Boostane due to the hot temps we have here. One can per 18 gal fill up. Seems to work well. Since I will have IAT's in the ~ 40F degree range from the interchiller, using water/meth has no cooling benefit and the 118 octane of the 100% methanol combined with the cold IAT's should eliminate any detonation and allow for some additional timing. There are guys using the smaller Hellcat supercharger on 426's, and it seems to work, but I don't think its optimal. The larger Demon unit is a better solution. I did not want to go Magnuson or Whipple. The factory look is appealing to me. And I will keep the boost very close to the stock Demon 14-15# range. No more. Whatever I get with the additional size (+50ci), internal parts and Thitek heads will be more than good. |
#47
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As usual, your numbers are very helpful. And the 100HP parasitic for the Demon supercharger tracks with that of the Hellcat. Its generally accepted that the smaller Hellcat supercharger has an ~80 HP parasitic. |
#48
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I am having the Demon supercharger put on the Hellcat. I did a cylinder head exchange with BES, and they sent Demon heads back with their pro-port work. The Hellcat and Demon head castings are the same, but the Demon has better valves to live in the hotter environment of the higher boost. So essentially, at this point, I have cloned the Hellcat engine to a Demon, and modified from there. Other mods getting done are OST Dyno Demon plus cam & kit, springs, ti retainers, +10% lower pinned ATI dampener, larger idlers for better belt wrap, new Demon hydraulic roller lifters, heavier Manley pushrods, Fore Innovations staged dual fuel pump setup with Fore rails, Aeromotive boost referenced regulator with return (factory setup is dead head). All fuel lines are PTFE lined with #10 up to Y, #8 thru rails to regulator and #8 return. Also, a Pro Meth methanol injection setup, with the supercharger lid getting 6 nozzles (3 per side) placed over the 2 internal heat exchangers. Already had Stainless Works 2" headers The last mod is an FIINTERCHILLER setup. We scrapped the air to liquid factory stuff in favor of the best chiller on the planet, made in Austrailia. A race comp, stage 2 setup that takes IAT's to sub 60 degrees in 105+ degree summer weather. In cooler times of the year, IAT's can be well under 32 degrees. Also putting a Demon torque converter in, have a CCI driveshaft and the Demon 3.09 rearend ratio with a Per4mance DIRS brace. AAD adjustable suspension parts with the spherical bearing upgrade. With 91 pump, a 32 oz of Boostane in the tank and the meth injection, were only shooting for 15# of boost. A nice conservative tune. In the near future (EOY) I am going to make the switch to E85. There are finally enough stations with this available to make it reliably available. When I make that switch, we will re-pulley for 18# and put bigger injectors in it. As for power, with the pump gas setup we should see low 800's on the tire. Maybe make the teens, but to keep from hurting anything, we will not be pushing the timing. Once we switch to E85, should be around 900 at the tire. We will be close to the safe limit of the bottom end at this point. Rods seem to be the culprit. Molnar has a very strong drop in Hellcat/Demon rod upgrade. I would also upgrade the pin to a Trend H13 with the DLC coating. Last edited by Tom McQueen; 08-23-2019 at 11:02 AM. |
#49
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So I was having a lot of problems with the modified injectors that got used on my Hellcat engine build. Finally threw them in the trash and got a set of ID1300X.
Then I had a very good Hellcat tuner from back east do a remote tune on it at a local dyno shop. That was 2 days ago. It made 899.5 HP and 765 FT LBS TQ at the tire. I think its safe to say the engine is making 1000FWHP. This is on E85. |
#50
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Damn that’s a lot of power. I love our Hellcat- it’s a tame daily until you stand in it. I can’t imagine it with a extra 300 HP!
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#51
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What a time to be alive
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120 '66 Pontiac GTO - 389, 4 speed street cruiser |
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