poor dyno numbers from 408 :(

rwhite65 · 04-17-2005, 08:29 PM

Andy669,
thanks for posting that....gonna be a few days before the car can do a pull again......see the other post.

Ryan

rwhite65 · 05-08-2005, 03:28 PM

Well, the thing feels tons better since we have played with timing and fixed the broken timing chain cover

The big rear tires dont seem big at all on this car.

I think a dyno is gonna show it is falling sooner then it should. Around 5,000 5,500 she still falls off. I believe the cam is designed to pull to 6,500. I am kinda thinking the high volume carter fuel pump (mechanical) may not be able to keep up at the higher rpms. Any thoughts?
Ryan

rwhite65 · 05-10-2005, 12:18 PM

I may have found another problem. The car looks to still have 2.25 exhaust on it. I dont see how the thing could be breathing thru that with its cubes.
Ryan

Dark_5.0 · 05-10-2005, 02:40 PM

I would imagine a 408 would be pretty choked breathing through 2 1/4. Its time for 3 inch.

tarmon8r · 05-12-2005, 09:18 PM

Im not thinking that edelbrock performer head is gonna flow enough for 408 ci 6500 rpm pulls. Exhaust needs upgrading as well.

04-17-2005, 08:29 PM	#1
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: poor dyno numbers from 408 :( Andy669, thanks for posting that....gonna be a few days before the car can do a pull again......see the other post. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

05-08-2005, 03:28 PM	#2
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: poor dyno numbers from 408 :( Well, the thing feels tons better since we have played with timing and fixed the broken timing chain cover The big rear tires dont seem big at all on this car. I think a dyno is gonna show it is falling sooner then it should. Around 5,000 5,500 she still falls off. I believe the cam is designed to pull to 6,500. I am kinda thinking the high volume carter fuel pump (mechanical) may not be able to keep up at the higher rpms. Any thoughts? Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

05-10-2005, 12:18 PM	#3
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: poor dyno numbers from 408 :( I may have found another problem. The car looks to still have 2.25 exhaust on it. I dont see how the thing could be breathing thru that with its cubes. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

05-10-2005, 02:40 PM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: poor dyno numbers from 408 :( I would imagine a 408 would be pretty choked breathing through 2 1/4. Its time for 3 inch. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

05-12-2005, 09:18 PM	#5
tarmon8r Registered Member Join Date: Jun 2002 Location: manassas, va Posts: 186	Re: poor dyno numbers from 408 :( Im not thinking that edelbrock performer head is gonna flow enough for 408 ci 6500 rpm pulls. Exhaust needs upgrading as well. __________________ 1983 mustang, 393 cubic inch stroker small block, victor jr heads and intake, gold race 1.6 roller rockers. comp cam 304, 244@ .050. .576" hydralic retro roller cam,lunati rods. block was o-ringed,10:1 forged pistons, speed pro fit fit rings, clevite bearings,msd distributor and igniton,be cool huge radiator, black lite electric fan, march underdrive pulleys, mildon deep sump oil pan, mac 1 3.4" long tube headers, 3" dr gas x-pipe and mac exhaust,ARP bolts. car weighs 2900 lbs w/out driver, sub frames, weld wheels, mickey thompson sportsman pro 26 x 10.5 x 15's,#8 fuel line steel braided

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