Competition MAX HP: 12V or 24V?

[GO 4LO]

Ok, guys, if you wanted to set out building a truck to make as much power as possible for dragracing, would you use a P-pumped 24V or 12V?

Do the increased airflow benefits of the 24V head, and the better injector placement, outweigh the mostly so-so pump tunes after the conversion to the P7100? Can a p-pumped 24V be dialed in to make the same amount of power as a 12V with the same pump and modifications (head, cam, twins, etc. )? Thanks.

Chris

 

[Jetpilot]

Yes a p-pumped 24v can make equal if not better HP.

 

[nfox]

12V

I got 250RWHP with my 96 12v 5-speed. Oo.

 

[jjohn]

I though a 12V could be made flow better than a 24V.



Wasn't the main reason for the 24V emissions reasons???

 

[GO 4LO]

Piers' data says they can get the 24V head flowing better than even a 12V with bigger valves. Did you hear different from another company?

Thanks for the responses, guys!

Chris

 

[jjohn]

Hey Go

Originally posted by GO 4LO

Piers' data says they can get the 24V head flowing better than even a 12V with bigger valves. Did you hear different from another company?

Thanks for the responses, guys!

Chris

Just something I picked up somewhere... Most likely a TDR post. I'm curious now how the two stock heads compare?

 

[GO 4LO]

http://www.piersdiesel.com/DodgePortedHead.htm



Here's Piers' data - they've got stock values, if you'd like to see it.

Chris

 

[jjohn]

Thanx Chris

Thats interesting.

JJ

 

[Joseph Donnelly]

Why hasn't anyone with a 24V made 800 hp with diesel only, let alone with only one turbo?

 

[Jetpilot]

Well almost all 24v trucks are vp44 equipped and the horsepower limit is around 750 HP due to fuel limitations. Now if you replace a vp44 with a p-pump you have a lot more fuel available.



So for someone making 800 HP with a 24v I don't believe it can be done with a vp44... ... . As for the single turbo, why? Also why limit oneself to #2 only? Joe why not challenge yourself and try tuning some H20 or N20?

 

[jjohn]

Originally posted by Joseph Donnelly

Why hasn't anyone with a 24V made 800 hp with diesel only, let alone with only one turbo?

Injection volume:



P7100 = 250 mm cubed



VP44 in light truck configuration = 85 mm cubed,

Highest configuration in a VP44=175 mm cubed.



Has a lot to do with it... I would imagine.



Tell me more.



By the way,

CR 1st & 2nd Generations light truck configuration = 100 mm cubed.

CR Commercial configurations up to 400 mm cubed



*( Bosch "Diesel-Engine Management" ISNB-3-934584-62-4 if your interested. Amazon has decent prices on Bosch manuals)

 

[Joseph Donnelly]

Missing the point. Even the P7100 converted 24 valves don't make 800, even with two turbos. Jetpilot made 674 on diesel only with twins. I think the highest 24V on #2 is Nathan Wright, using a VP44, twins, and DonM injectors, around 700+. It's a shame the P7100 guys can't catch him with their 24 valves on diesel only... since their pumps are supposedly so much bigger. What is the advantage to the conversion?



Racing is always about classes to see who can do the most with a given set of rules and configurations. I'm still waiting for someone else to break 600 (except DD) on #2 with one turbo. Might as well retire ol' Sickly for a couple years and let you guys catch up



Run diesel and learn about your truck. Olympic athletes learn their sports, don't use steroids.

 

[Jetpilot]

Joe,



I know an awful lot about my truck as I am sure other know about theirs. Broaden your horizons, step up to the plate, and learn something new instead of trying to hold everyone else to your self imposed rules. If you need to limit yourself to just diesel so be it but don't berate others for doing things different than you nor limiting themselves by your rules.

 

[F8LDOSE]

When's the last time a 24v. spun above 5000rpm?

 

[Jetpilot]

F8LDOSE,



Good point. The 24v in stock form will not even get close to this. Now take a p-pump converted 24v add better valve springs and you can rev the truck same as a 12v.

 

[KennyM]

I'm just simple, but here goes.



The above numbers thrown in. Highest vp44= 750 hp

Modified vp44 = 175 mm cubed

p7100 = 250 cubed.



1071 hp should be obtainable with a p7100 24 valve. #2 only. I would also think thid would work with good flowing 12 valve hd.



As far as spinning above 5k rpm. Should not be a problem with a p7100.



Correct me if I'm wrong I'm just observing.

 

[Jim Fulmer]

Give me a chance, I'm digging and clawing at everything I can afford..... I'm not rich but I'm not done with this deal!



Jim

 

[jjohn]

Originally posted by Joseph Donnelly

Missing the point. Even the P7100 converted 24 valves don't make 800, even with two turbos. Jetpilot made 674 on diesel only with twins. I think the highest 24V on #2 is Nathan Wright, using a VP44, twins, and DonM injectors, around 700+. It's a shame the P7100 guys can't catch him with their 24 valves on diesel only... since their pumps are supposedly so much bigger. What is the advantage to the conversion?



Racing is always about classes to see who can do the most with a given set of rules and configurations. I'm still waiting for someone else to break 600 (except DD) on #2 with one turbo. Might as well retire ol' Sickly for a couple years and let you guys catch up



Run diesel and learn about your truck. Olympic athletes learn their sports, don't use steroids.

"Missing the point" So what is the point? P7100 + 24 Valve a mismatch?

 

[GO 4LO]

So, Joe, do you think the P7100 / 24V is a bad combination, or just too difficult to tune or what? It can obviously still flow the fuel to support the hp, as evidenced by Doug's 886 run...

Can you tell us how much boost Sickly runs, or is that a secret?

Also, is it true you're selling it?

Chris

 

[cumminspwr01]

I think what Joe is saying is the problem is not necessarily in either one of the pumps. The problem may exist somewhere else. ie head, cam, pistons.