SuckFumes1984

To get 500hp out of a 24v you are still going to need to do a lot of mods like o-ring the head and upgrade the fuel system to keep it reliable. 500hp is easily achieveable out of the 12v and the 24v it is probably just a little bit cheeper to do a 12v 5sp. On the other hand a 24v truck at that level would be a bit tamer to drive as a daily driver because you can turn off your boxes and only have the extra power when you want it. Its all in what you want. What do you plan to do with this truck when you build it? Daily drive? Or is it just going to be a play toy?

mainiac

this discussion seems too broad. if we are talking about buying a truck and then modding it, 12v wins hands down. if you already own a truck, hopefully its a commonrail and 400 is a programmer away.
now, dyno numbers and functional horsepower are two entirely different things. dyno numbers canbe had cheaply, but actual usable racing power takes alot more supporting mods and gets very expensive quickly if done right.
my advice is don't overmod. o-rings are not necessary with todays head stud bolts until over 60 psi. intake horns and other small add ons do very little in the long run for big power. try to keep to the basics, air and fuel and tranny...do not forget tranny..can easily be worth 40-60 rwhp.
good luck

Midnite

Absolutely--the cost of the truck itself factors in. A 94-97 truck is going to be cheaper than a 98.5-02.

There's trade-offs either way if you're only counting the cost of the mods. On a 12 valve you wouldn't have the expense of upgrading the lift pump like you would on the 24 valve. On the other hand, the 12 valve head is more restrictive than the 24 valve head. Small stuff in the big scheme of things, but worth pointing out.

Mike

J-man

Thanks for the suggestions, and keep 'em coming! I havent had time to post for a couple of days, but to answer some of the questions, here goes...
I do have a common rail now, but am trying to sell it in order to lower my payments and am considering a 2nd gen replacement. My goal with my 06 was to get to 500hp so that's why I picked that number to ask about on the 12ver or 24v. But... i would actually be happy to be anywhere close to 400 since I'm not much over that now and it's still very fun. My truck now, and the 2nd gen in question is/will be a daily driver that does a little towing, is fun to hot rod on the street, and possibly take to the track once or twice. I'm mostly interested in very basic power mods that a mechanical dimwit (me) can do myself or with a little help and of course as inexpensively as possible. I'm still curios to know if either the 12v or 24v gets better fuel economy. Thanks again and keep posting!

partyshortbusdr

a cr is gonna be the cheapest to get 500hp out of. It will cost you about a grand to get 500hp out of a cr with the right tunes and other accesories. A 12v does have the cheapest mods but they will only take you to about 300-350hp tops for free, after that it gets expensive. I have a 12v with the 180 pump, and im getting 425hp with $2500 in the motor. Would prolly cost me $2800 to get 500hp out of my truck if I had gotten a diff turbo and injectors. My buddy thats a diesel mechanic dynoed 460hp on his cr and only has $800 in his motor. So thats $2500 for 425hp on a 12v vs $800 for 460hp on a cr.

J-man

This is just the kind of info I need! Thanks.
So, when you say "free", do you mean you can get that power just by modding the pump? What if you just mod the pump and add bigger injectors?

BigErksG2

Mod the pump with bigger injectors and you will have alot of smoke and high egts with an hx-35. stock injectors workin hard are about all the hx35 can take. If you like fab projects you can build a nice set of twins that can push over 500hp for about a grand. If not, a 62/71/14 should be able to get you around 450 on a 12v with ddp2 or comparable injectors. You dont have to do studs but I would for some security. So above the price of the truck you would need injectors ($650 new $400 used) a 62 71 turbo ($1400 new $900 used) timing ($100 is you dont have the tools) 4k gsk ($100-$200 depending if you get valve springs) and the rest of the stuff is free besides a clutch which can be had for about $900. GOOD LUCK!

partyshortbusdr

a 62/71/14 is way to big for ddp2 injectors. ddp3 or ddp4 would be needed to spool that turbo. a 62/65/12 with the modded wastegate would work good with ddp2. I personally would never get ddp injectors in the first place, they are just expensive marine injectors.

I am currently running 5x.012 injectors (equivlent of ddp3) with my 62/65/12 and that is a good combo

J-man

I like the idea of the twins, what exactly would be included in that $1,000 estimate for the fab - up? also, is there any need to get whole injectors, or just get nozles?

Swarthy Dago

thankyou !

cumminsdriver635

First off. You DO NOT need twins to make 500hp.

A 62mm charger will make 500hp on a 12 valve no problem.

Here is a list that will make 400-500hp easy.

#0 plate- Free if you have a grinder
4k GSK- $125
.022 or 191 delivery valves- $200-250
New Era 370 injectors(or similar)- $400
17* timing- $120 or so
Studs/Gasket- $500
62mm charger- $1200 or so

So you are looking at around $2500 or so. It can also be done much cheaper if you keep an eye out for used parts. I see 370 injectors go for $200, DV's go for $150, and Studs go for $200 used all the time. That is about $500 you could save right there. Not to mention finding a used turbo for a good deal. Even a stock turbo should make a hot 400hp with that setup.

As for the transmission. If you have an automatic, count on $4500-5000 to hold that power reliably. For a stick shift, you are looking at $800-2500 depending on what kind of clutch you get. It wont be nearly as fast though if you like racing.

Eric

cumminsdriver635

A 62/71/14 isnt too big for DDP2's. You can easily spool that with stock injectors if the rest of the setup is decent.

Also, you can say what you want about DDP's. Who cares if they were originally marine injectors? They run great and make good power IMO. They are also very driveable.

Eric

partyshortbusdr

that is way too much turbo for ddp2, anyone will tell you that. inform us on all this info you know cause ive actually ran bigger injectors and know it wont spool something like that, at least to make it anything streatable.

oh yeah, and take a look at this thread
http://www.competitiondiesel.com/for...ad.php?t=63950

cumminsdriver635

You dont think laser cuts, and DDP2's would spool a 62/71??? Something is wrong if it wont.

Here is my cousins truck back when it had a 62/71/14, a 4k, Laser Cuts, New Era 370's(5x.012's), #0 plate, 18* timing, and a billet Goerend transmission. Those injectors arent far off of DDP2's at all, and it seems to me that it spooled pretty well.

http://video.thedieselgarage.com/sea...b300284c54.htm

http://video.thedieselgarage.com/sea...b3001eb8ac.htm

http://video.thedieselgarage.com/sea...b3001717d6.htm

Eric

partyshortbusdr

didnt mention laser cuts before, guess it can spool the turbo then. I guess i would just rather run 140 injectors on that turbo with my stock 181's. Thats what ill be runnin in the next week or so.