Not that I'm thinking of attempting it or anything, but from a theory standpoint, how would a VE handle boost considering the Variable Timing Control (not the actual ones that we know have problems, but the theory behind them) and whatnot?

Would they work together or against each other? I'm rather new to boost-theory and I was reading up on Z31 turbology and it just got me thinking...

Also, am I correct in stating the VG and VE blocks are the same? The VE just got a different top end?

 

The blocks are similar, but not the same. The problem with variable timing control is just how it sounds; it variates the timing to produce more power. With a boosted engine you do not want to run too lean or you will get ping and your pistons and rods go to hell. Many honda kids disable their V-Tec to run boost. The VTC will help spool the turbo, but you will risk burning a hole through the piston. If you were to still have VTCs than you would want to go with premium fuel, and have an SFAC-II or something that can CLOSELY moniter the knock count and activities when the timing variates.

 

From what I caught on the Z31 turbo faqs, is (and this is if you plan on boosting more than the 4psi they get stock) you want to run premium fuel, to avoid detonation, this is obvious. I would assume, and this isn't backed up, that you would want your spark to occur pior to TDC so that the fuel isn't exposed to as high of a compression and thus, is less likely to detonate...

All of these questions are in regards to a "perfect system" ie: on paper. Not directly related to the VE...

Maybe I should just go buy a book

 

I like this thing called google

 

Aztec- also go through the turbo/supercharger forums you'll learn a tonn. You can still have plenty of timing BTD not much of a problem. the BIGGEST probablem by far is keeping it fueled.

~Alex

 

I run 10psi, premium (of course), and my timing is pulled back 2 deg BTDC. VTC's are working, and my knock sensor is disconnected. No problems so far, my EGT's and A/F are good. I also dont have an SAFC.

 

Is that a FMIC I see through your front lip or is that just the radiator?

 

It's an fmic. I was a little off on the VTC thing. After talking to a friend, she enlightened me that with variable valve timing and high amounts of boost, there is often too much pressure on the valvetrain. Brad, do you use any sort of engine management?

 

The thing about the VTC and turbos, turbo engines don't like to see a lot of cam timing, which is what the VTC gives you. If anything a turbo cam will have more lift and less duration, (much like a stock cam) and a lot less overlap than what you're going to see on the top-end with a VTC system. Overlap is pretty bad for a turbo system due to pressure in the exhaust tract. supercharged engines don't really have that problem and tend to run cams a little closer to naturally aspirated hi-po cams.

my $.02

 

Right now all I have for management is a Begi FMU. I have 370cc injectors and a Z32 maf also. The FMU gets the job done, but its not a very good tune. This summer I might be experimenting with other options.



Big radiator.

 

Where the hell did you find a FMIC that fits in the max?

 

It's from a place called Johnny Racecar. They have stuff on Ebay, as well as on thier website. I had to cut the bumper support up pretty good to get it to fit nicely.