My dad works at a Volvo dealership and those Volvos are one *** of a truck.  

i have heard that they are crap. i heard that from a few people at a truck stop one day. they were driving one and were saying it only has 530000 miles on it and everything is rattling steering is really lose and the truck looked like it just came through h e l l and back.  

Yea, I've seen that new Volvo engine, its called the D16, and it is a beast! Even with all the emissions crap on it still sounds realy cool, and from what I hear they will snap your neck when the truck is unloaded. As for the C-15 talk, my company runs 4 Kenworth w900 tractors with twin turbos and honestly they are not much to talk about. We had a Cat 425 in a 91 Peterbilt and that thing would pull 2 of those new tractors backwards at the same time! Personally, I am a Cummins guy, but Cat has made some good engines in the past.  

you can unplug the wire to the engine mounted fuel filter  and get a plug from cat tht fits it and wire in a 100 ohm resistor you can get that at radio shack  it makes the computer think you have at least 5 pounds of boost and perfect fuel temp so it helps your timing out . you get about half a gear and quicker spoolup out of it  .you can also unplug it and hook it back to the filter if it goes in for warranty work and it wont show on your ecm  total cost is about 5 bucks  

from what i hear from the drivers you definatly dont want one of those twin turbo cats. gutless turd i believe was used.  

sandslinger79:
from what i hear from the drivers you definatly dont want one of those twin turbo cats. gutless turd i believe was used.

I've got 2 of 'em.  An 05 & an 07.  They are miserable.  My 05 has been bumped to 550hp, which by the way will cost you 1800.00 through CAT for the additional warranty to cover the HP, (that is if you're still under warranty).  I bitched how shitty the truck ran for almost a year, so I got the uprate for free to shut me up.  Fuel mapping has been recurved, which did yield more power & MPG, catalytic mufflers replaced with old C-15 mufflers which resulted in better MPG but a little slower to spool up.  I drive this truck & don't let my drivers near it.  It runs OK but my new truck coming has the Cummins ISX 500HP in it, which will spank both CAT 550's.  The 07 is a factory 550 & seems to run a little better but is still unimpressive.  The boy I have in that truck came out of a Cummins ISX 565HP & I still hear him *** about how much better his Cummins was at his last employer.  Anyway, stay away from the ACERT at all cost.  MPG SUCKS.  

As for performance upgrades, Google Haynes Performance.  They make some stuff for the CAT motors that could help you out.  Also Pitts. Power as mentioned before.  Lastly, I think Donaldson makes a set of reuseable high flow air fliters for the trash cans that yield some more boost.  Hope that helps.  

The cat C-15, C-13 and C-12 acert or not all have twin dual stage turbos on them, I work for CAT  

C-15 acert, C-13 acert are twin turbo the C-9and C-7 are not at least in the truck applications. C-12 is older engine they never put vva's on it I think the latest were mbl or something.  

quick question i have a 475 isx,just curious if something after market add on for boosted performance  can be added to a cummins if so do you know where??? or what???  

For the ISX, try:  http://www.pittsburghpower.com/
They say the ISX will be available spring '08.