Understanding the difference, I don't want to be misinformed Options

[frosty]

I'm not looking to getting flamed, I just need to understand something.

As I've been searching the forums about my previous post on future engine mods, I found that it's not good to turbocharge the beams motor.

Is this true? If so then why? To my understanding hondas v-tech motor can be turbocharge. Is not the vtech and the beams vvt-i somewhat similar in what they do? PLEASE, IF YOU KNOW THE ANSWER, CORRECT ME AND CLARIFY THIS!!!! I do not want to be misinformed on this. As a celica lover I need to know this and as you guys are celica lovers you should correct this information.

Thank you.

[Kwanza26]

Wannabegt4 is the only one rolling in the right direction here unfortunately.

First off... VVT/i is NOT anything remotely similar to VTEC. VVTL-i may be almost the same as VTEC... but VVTi is NOT. VVT works like a computer controlled adjustable cam gear. It only affects cam timing. VTEC actually changes cam profiles (cam lift and duration), able to run a low cam for normal everyday use and then able to run a high cam for high performance in the higher rpms, where longer duration cams and higher cam lift is of greater use. There are however many different versions of VTEC...

As for turbo charging the BEAMS... it can be done. The only major mechanical issue is the high compression. I'm actually gonne go out on a limb and guess the BEAMS and the other n/a 3SGE motors have the same crank and rods as their 3SGTE counterparts. Why do I say this? Consider the 4AGE. Smallport, 20V... all of the later model 20mm pin versions all share essentially the same rod/crank set-up as their purposeful forced induced family engines (4AGZE in this case). Chances are, the n/a 3SGE's are exactly the same way. Besides that... other problems will include custom tuning for VVTi, fuel managment... etc. The reason people warn against turbocharging the BEAMS motor... because it's built inheirently as an n/a motor. Turbocharging and tuning will yeild no advantage over a 3SGTE...

Other things to consider... performance n/a engines tend to have more overlap than forced induction engines. Higher boost and a lot of valve overlap can cause issues...