poor dyno numbers from 408 :(

andy669 · 04-15-2005, 07:02 AM

If the firing order was wrong, you would hear it. Plus, if that thing made 300 horses on only 4 cylinders? Holy shit! That thing would be a monster. 1-2-6-8 will still fire correctly either way. Good thought, but I dont think thats the problem.

It could very well be something timing related. 15 degrees of timing was worth exactly 100 horsepower in my car.

Andy

rwhite65 · 04-15-2005, 09:19 AM

I really think it is going to be the timing. I have just gotten busy with work here (begining of my work week) and have not had time to put the advancement pieces back in.

I am hoping tomorrow to put it together correctly, which should give me atleast 20 more degrees total advancement (give or take a few). Will post when we do it.
Ryan

andy669 · 04-17-2005, 07:33 PM

Heres a couple of my dyno pulls.

Andy

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.

04-15-2005, 07:02 AM	#1
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: poor dyno numbers from 408 :( If the firing order was wrong, you would hear it. Plus, if that thing made 300 horses on only 4 cylinders? Holy shit! That thing would be a monster. 1-2-6-8 will still fire correctly either way. Good thought, but I dont think thats the problem. It could very well be something timing related. 15 degrees of timing was worth exactly 100 horsepower in my car. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

04-15-2005, 09:19 AM	#2
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: poor dyno numbers from 408 :( I really think it is going to be the timing. I have just gotten busy with work here (begining of my work week) and have not had time to put the advancement pieces back in. I am hoping tomorrow to put it together correctly, which should give me atleast 20 more degrees total advancement (give or take a few). Will post when we do it. 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

04-17-2005, 08:29 PM	#4
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	#5
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	#6
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	#7
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

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