An interesting thing came up in another thread in this forum...that a 12v is cheaper to mod. Is this actually true? I know you can get about 280HP and 605ftlbs on early 24v and 300HP/645ft lbs out of a later 24v for about $450. For simplicity sake, lets take in theory a '98 12v and '98 24v. Which one will make the most power for the least amount of money it takes for each truck? We'll leave a new exhaust and intake system out of the question since these mods cost the same for both trucks. Since I know 10 folds more info about 24v motors than 12v personally, I won't even bother with figuring out what it costs to pump up a 12v. I'll go with a 24v and let someone else chime in on the 12v. Pop in an Edge EZ for about $425 and the truck is making 280/605 power. Thats pretty darned cheap power to me. There are probably even cheaper chips and programmers out there. How about the 12v?
Grinding the stock fuel plate to a #10 shape (free) Advancing the timing to 16 degrees (free, if you can borrow the timing tool) 3,000 RPM Rev kit, $125 370 injectors, $300 This combo should be good for 300hp at a minimum, and around 700 tq depending on where the fuel plate is slid, and will cost no more than 425 bucks to do so. Of course the fuel plate can be ground to an even more agressive cut.
http://www.ftlbperformance.com/ I paid 300 for injectors, and 300 for an ATS manifold last summer. Real nice guys to deal with.
FWIW, you can get RV275 sticks for your ISB for $300.....sometimes less if you shop around. As for taking a 215 hp pumped 98 12v and plate grinding, grinding the fuel cam plate to a #100 profile instead of a #10 will eliminate any top end defuel and coupled with the GSK will fuel HARD to 3000 rpm. This will yield well over 300 hp on a 215 pump. Add 370 sticks to that and you have the ability to fuel well over 400 hp. My little 160 pump is set up just like the 215 described with the exception of the fact that I run laser cut 191 dv's and it pumps way over 400 hp in this configuration. It runs a 13.90 @ 101 mph with a wet weight of 6680 lbs. Nice thing about the low hp peak as compared to the 24v is that at about 425 hp or so you are at roughly 1000 ft/lbs where as you don't see that torque on a 24v until roughly 475 hp because of the higher peak. IMO, the 12v is more work to bomb but costs less money. The 24v is much easier to bomb but costs more money......after 500 hp, they both start to cost a lot, though! LOL....
on the site linked above... they have some RV300 injectors listed. http://www.ftlbperformance.com/9802dodge.html <-- bottom of the page are these different than the RV275's? the price is the same it seems
Both the 275 hp and 300 hp versions of the ISB use the same injector. There is no difference in performance between the two.....for all intensive purposes, they are the same.
Dodge switched from the mech pumped 12v motor to the 24v electronic pumped motor in 1998.5. Trucks from the first half of the 1998 year model have 12v motors and trucks from the second half of the 1998 year model have the 24v motors. I wish I could have found a 1998 truck with the 12v motor but I ended up with a 1998.5 24v truck. I am very happy with it too though. It is doing a damn fine job for me. Harley
Another cheap mod going for a 12 valve, you can make a 3k GSK by using a couple 3/8" washers in the stock springs.
