Dyno Video of my 400+rwhp

[slvr03dakrt]

Videos of my 408 running lean on the dyno I put down 408rwhp and 418rwtq with some better tunning and fuel system upgrades i'm thinking 425-430rwhp is very capable.
http://www.youtube.com/watch?v=jADgLbnM7yM
http://www.youtube.com/watch?v=YMiyDKbnfSM

[Five9Dak]

Not too shabby, get the tune straightened up and she should run good. I think I can hear it nose over on the first video.

Were you dropping pressure, maxxing out the injector, or not able to command more fuel while on the dyno? (Or a combination of....)

I wouldn't go spending money on a return setup unless you have data that shows you need it. People have made more power than that with just a just drop in pump.

[Sick 660r]

Nice vid. Get the tune straight and you'll be good to go.

[03dakrt]

Also curious why you were lean. I have a real similar setup, going on the dyno for tuning in the spring.

Are you using the Ford 30LB injectors?

[slvr03dakrt]

Not too shabby, get the tune straightened up and she should run good. I think I can hear it nose over on the first video.

Were you dropping pressure, maxxing out the injector, or not able to command more fuel while on the dyno? (Or a combination of....)

I wouldn't go spending money on a return setup unless you have data that shows you need it. People have made more power than that with just a just drop in pump.

It nosed over bc the converter was flashing and then it locked up.
I had no real way to tell if i was loosing fuel pressure but i was talking to the guys at the shop and they said with the hp i'm making i'm more than likely stressing the stock fuel system b/c in all reality i'm making over 525 hp at the crank when the stock fuel system was meant for a 250hp stock motor.

[Five9Dak]

Borrowing a fuel pressure gauge; then buying injectors (or even just adjusting your tune) is a lot cheaper than a return system, injectors, and adjusting your tune.

[mtlcafan79]

I'd want to know the duty cycle before anything else.

[Sick 660r]

I'd want to know the duty cycle before anything else.

100% FTW

[Sixfootface]

so....... how much did this 408 run you?

[slvr03dakrt]

so....... how much did this 408 run you?

Well I quit keeping track of it along time ago but here is a break down of the internals
k&n intake $200
58 mm tb $400
m1 4bbl $375
comp rr $300
pushrods $60
lifters $150
cam $350
timing chain $75
valve covers $150
rotating assembly $2300
ported eddy heads $2400
stud girdle with main studs $250
head studs $150
oil pan and pump $400
gaskets and sealers $300
viper converter $800
headers and full exahst $1000
block machining $800
So it's somewhere around 10k with you assembling the motor yourself from scratch but most people already have the normal bolt on parts
sct tuner $400

[dakotapimpc]

catching your truck befor it runs tooo lean PRICELESS:nana:

[slvr03dakrt]

The motor would toast if it was boosted and thank god for forged internals. I have 7 k miles on the motor right now and I did a compression test the other day and I have 185-190psi on all 8 cylinders with the ring gaps set up a little wide for a shot of nitrous it prob won't ever see

[dakotapimpc]

hell yeah man your good to go!

[grapejuice1998]

It nosed over bc the converter was flashing and then it locked up.
I had no real way to tell if i was loosing fuel pressure but i was talking to the guys at the shop and they said with the hp i'm making i'm more than likely stressing the stock fuel system b/c in all reality i'm making over 525 hp at the crank when the stock fuel system was meant for a 250hp stock motor.

I would still see I could tune it as is first. Not to bash your shop, but they may not know that the fuel system can indeed keep up, but instead, are trying to sell you on the return system (not taking into consideration that you would do the work yourself).

[slvr03dakrt]

Well the shop I dyno doesn't even work on dodges. He mainly said that a booster pump should do the trick or a 255lph in-tank should help keep steady pressure especially when flogging down the whole 1/4 mile.

[Five9Dak]

That is of course, if you are dropping pressure.

Alan, do you see a pressure dip when you fire the kit? If anything will show a weakness in a fuel system, its the fuel solenoid opening up.

A lot of closed loop pressure regulated (ford and chevy) systems have trouble keeeping up with large changes in demand, our mechanical regulators on the tank are better than most give them credit for I think.

[grapejuice1998]

That is of course, if you are dropping pressure.

Alan, do you see a pressure dip when you fire the kit? If anything will show a weakness in a fuel system, its the fuel solenoid opening up.

A lot of closed loop pressure regulated (ford and chevy) systems have trouble keeeping up with large changes in demand, our mechanical regulators on the tank are better than most give them credit for I think.

From what I remember when I ran a gauge, it would always dip for a second under a load, even without the juice. When I did hit the juice out of the hole, it never dipped more than normal. How much, I couldn't say for sure. Maybe 5-10 psi?
I think a bone stock one will do the same though, IIRC.