Sorry, I don't. When I was at the CT factory a couple of years ago to watch a friend get his done, it was a package deal with all the work, dyno time and tweaking. I can't imagine that the pulley is more than 50 bucks, if that. But then there's the new belt. That's the smallest expense. It's the labour to change it and the dyno time that costs.

 

My AFR #'s look similar to yours at WOT, though you seem to be running a bit on the leaner side after 6000rpm...

13.5 @ 6500rpm ... I was always under the impression that you should try to stay in the low 12's at the leanest when in vtec.

Anyone have any inputs on this?

 

Even the 13.0 gives me the creeps. However, tuning that lean spot out would require richening everything else out or having to get a stand alone. Mind you, the O2 pickup at the tailpipe will generally give a/f numbers almost 1/2 a point leaner than it really is.

 

[QUOTE=xviper,Sep 25 2006, 06:50 PM] Even the 13.0 gives me the creeps.

 

i made 284.2hp/180tq at a stock comptech with A/C. and made 5.6lbs of boost. as far as upping the boost i have ordered EMS with UEGO and 750 injectors and a 4.25" pulley that will be installed, as far as $ of additions figure 2500 to up the boost and add ems with injectors, injectors,a smaller pulley and some sort of engine managment are all required to make more power, you can spend 500 or 1500 for an EMS system, it all depends. I think at a bare minimum you could spend 500-700 and run a safe a/f ratio and make good power.

 

Could he go a cheaper route by using a VAFC to remove fuel at specific spots, after he richens it up across the band?

 

Thats a bit surprising that a stock comptech kit would do that. But it sounds right... any richer and you'll be hitting 10's at your richest.

Although I have ZERO experience in piggyback/standalone ems ... standalone definitely isnt necessary for a stock kit... a simple VAFC should be able to fix up your trouble spots. I realize its not the best solution, but at least you can dump a bit more fuel after vtec to keep things safe. Greddy emanage is also something you should look at, but I see you're already doing your research on that

 

According to the countless posts I've read regarding VAFC, i believe this is what many people do.

I've seen many people increase fuel pressure via FPR and then decrease fuel on a few spots to compensate... others claim that VAFC is capable of both adding fuel as well as subtracting. I'm not quite sure myself as my AFR's are looking pretty good, so I havent found the need to go down this path quite yet.

 

What about greddy emange? IS that an ok solution?

And somebody tells me that piggybacks dont' work too well too long. Because the ECU learns what going on and messes it all up.....

 

I was just thinking. Wouldn't the ecu messe up vortec black boxes?

Assuming th erumour is correct about it messing up VAFC's and emanage?