engine difference between o3/04 and 05/06

[mtech1234]

I have a 06 coupe 6MT. In the Spring I am going to do the APS twin kit. I have a wealth of Auto knowledg as I spent the last 20 years as a tech and 10 of those in the import market, SUPRAS, RX7,300ZX, ECLIPSES Etc Etc and did Engine managment and Dyno tunign for 12 Years in Import and Domestic, HALTECH trianed AEM Trianed, Accell DFI trained and countless others but 3 years ago traded my Dyno bay and tool boxes for a desk and a computer as a Mortgage broker. Not quit as much fun but a ton more money and better working conditons.... Any way I dropped out of the scene just before this car showed up and I always liked them so I finally bought one. I lost touch with the market. And now I ma back

What I need to know is the difference between the motors I have heard people refer to the 05 06 as the Rev Hard, What do they mean What is different. What concerns should I have with the Turbo kit and making 480 Wheel whith the APS kit. I would rather put rods and pistons in it now than after it breaks. If the 05/06 engine has proved reliable at that power level I would just as soon not take apart the motor with only 3k on it. I have heard alot of stories recentlyabout people cars blowing up with this kit or that kit at lower power levels. Something I learned years ago is almost every car that came to us with a blown motor because of heavy mods came unglued do to poor tuning not because the kit or the car was bad. I have made some serious HP on some stock motors and last for 10'S of 1000's of miles with no issues while numerous others with less parts and power were constintly breaking. POOR TUNING Blows motors !!!!!!.

Any way please keep any ansewer to your first hand expirience. If you have worked with the VQ motors and turbo kits I appreciate you info and knowledge. I know how hard it is to come acrossed it.

Bill

[G_whizz]

Hello Bill and welcome to NICO. I have no doubt you will get answers to your questions here from other members. This place is a wealth of information. If no one answers your questions in a timely fashion, you might want to try the search option I myself have not had first hand experience with those mods. So I can't help ya.

Again, welcome to NICO!

[C-Kwik]

The rev-up motors make more power mostly due to more revs (hence the unofficial decription of rev-uo). There are some intake plenum changes and they added a 3-step variable cam timing on the exhaust cams in addition to the existing infinite variable cam timing found on the intake. The cam profiles appear to have changed to accomodate more torque up top(which results in the higher peak HP and RPM) and lost some midrange torque. My speculation is they have lost little to no low-end. There is some speculation that the rev-ups have stronger internals. I would suspect mainly in the rods as the increased revs would require an increase in tensile strength. Not sure how much beefier the bottom end might be though, particularly in terms of handling boost.

I would suspect many of the blown VQ's you see are the result of poor tuning. But the VQ has a very small margin to work with. It's hard gathering data on such things as many owners who have blown motors don't know what to look for or the failure is too severe to diagnose without some serious forensic science.

I'd take a note from Stillen's tuning on this. They have the most reliable forced induction kit out there for the VQ's. They aren't pushing the power envelope as much as many of the turbo kits and some of the other S/C kits, but I've heard of no failures with even the stage 4 kits. They fuel management is probably key...they use an extra injector and a timing control unit as opposed to trying to replace the ECU and/or injectors. My understanding is Vortech reversed engineered Stillen's piggyback computer and is using their own version now. I'd be making sure the boost controls(wastegate) is reliable as well. You're probably going to be waking a thin line to detonation so keeping any boost spikes from occuring would be a good idea.