Another S/C'd member worried about his AFR

[CTScott]

I've been following this thread and doing some research. I think the CAMCON-T has a lot of potential with this issue (and it is fully compatible with the Yaris 1NZFE):

http://www.powerenterpriseusa.net/pr...con/camcon.htm

TOYOTA VVT-i & VVTL-i
The CAMCON-T controls the VVT-I timing +/- 20 degree in 15 different points of 500rpm increments within 2000rpm to 9000rpm Range.

A/F is controlled -10% to +20% in 17 different points of 500 rpm increments within the range of 1000rpm to 9000rpm.

[LtNoogie]

Anyone ready to be the first to try this?

http://forums.trinituner.com/forums/...ors-199355.htm

[Nexus1155]

if you're already taxing out the injectors why add more pressure to them! its like adding to the problem lol, especially if the fuel pump is not adequate enough as well

[LtNoogie]

Problem is there's no proof as to why the engine is starved for fuel. Not long enough duty cycle? There's no way to know if we're running at 80% duty cycle is there? Not enough fuel pressure? Not sure how to measure that under load.

Some of this is trial and error and hopefully the sharing of experiences on the SAME platform. It's nice to know what worked on a totally different car but...

[jkuchta]

Adding a little more pressure to the injectors shouldn't be a problem, and would be a good way to add a little more fuel.

The problem is the pump itself and the type of fuel system we have.

The fuel system is a returnless system...which means that fuel pressure changes are brought about by speeding up or slowing down the pump. To add a boost-referanced regulator you'd need to not only boost the pump pressure up over what the max fuel pressure would be, but you would also need to add a fuel return line back to the tank.

This is not impossible, but is a little work.

What someone ought to do is referance the pump voltage to the boost pressure. If it's not too taxing on the pump, that solution might circumvent the need for a return line. I have no idea what the ECU would have to say about that though.

[PETERPOOP]

The thought of slightly larger injectors seems to be worth trying. I just got my 1zz throttle body in the mail that I ordered weeks ago. I'll wait to put that on later.

[LtNoogie]

Originally Posted by jkuchta

Adding a little more pressure to the injectors shouldn't be a problem, and would be a good way to add a little more fuel.

The problem is the pump itself and the type of fuel system we have.

The fuel system is a returnless system...which means that fuel pressure changes are brought about by speeding up or slowing down the pump. To add a boost-referanced regulator you'd need to not only boost the pump pressure up over what the max fuel pressure would be, but you would also need to add a fuel return line back to the tank.

This is not impossible, but is a little work.

What someone ought to do is referance the pump voltage to the boost pressure. If it's not too taxing on the pump, that solution might circumvent the need for a return line. I have no idea what the ECU would have to say about that though.

I need to search the service manual to see if it gives the output fuel pressure of the OEM pump.

Originally Posted by PETERPOOP

The thought of slightly larger injectors seems to be worth trying. I just got my 1zz throttle body in the mail that I ordered weeks ago. I'll wait to put that on later.

Like I said, someone should try one method and I'll try another. But Peter, you've got to get some instrumentation so that you can see a before and after reading. No more butt dyno. We now know yours measures too high.

[PETERPOOP]

Originally Posted by LtNoogie

I need to search the service manual to see if it gives the output fuel pressure of the OEM pump.



Like I said, someone should try one method and I'll try another. But Peter, you've got to get some instrumentation so that you can see a before and after reading. No more butt dyno. We now know yours measures too high.

My butt is too sensative I guess. I will have the scangauge II soon. I am willing to try the larger injectors. What about a combination of slightly larger injectors and the 1zz tb?

[Nexus1155]

i think the cars would be better off doing the garm conversion with the fuel system. But there would be an easy way to rig up some electricals to fool the system within a certain range. Worth a shot!!!!

[LtNoogie]

If you more than one thing at a time, you'll never know which item contributed to the gain or loss in power.

I honestly do not know whether it was my intake, header, exhaust, or pulleys that changed the way the car ran. I did them all at nearly the same time. Maybe one of the mods was useless. I don't know.

[PETERPOOP]

Well I need to look for some 1zz fuel injectors now. I'll try those on, get some numbers, and then later, put the 1zz tb on that I have. Maybe they will equal eachother out?

[dallas]

You guys are doing some really great work at trying to figure out the lean condition. I'm sure there has to be 30 hp with a proper tune.
You would think the fuel pump can handle the volume of fuel needed to run 120hp, I think the problem must be somewhere else. it must be in the management, injectors, etc. I find it hard to believe that the car cannot compensate for a 20 hp increase. Has Blitz responded with anything?

[PETERPOOP]

Originally Posted by dallas

Has Blitz responded with anything?

Garm will let us know when they do. He sent them my a/f readings.

[whooppee777]

im going to use my blitz fuel controller to tweak the a/f ratios to where they should b

[largeorangefont]

Originally Posted by PETERPOOP

Well I need to look for some 1zz fuel injectors now. I'll try those on, get some numbers, and then later, put the 1zz tb on that I have. Maybe they will equal eachother out?

Nope. I assure you that your HP will be lower with larger injectors, and the car will run bad off boost and when cold.

[Nexus1155]

unlikely, but it wont be effective without tuning. You add more air youre going to need more fueling regardless. Might as well toss them both on, youd probably be in a situation a S load better than you are now!!!! Just to test it at least, make sure to have a wideband with you

[PETERPOOP]

no wideband here. you think i got 350$ for a gauge!? ;) i'll get one eventually. I'll have the scangauge on when I put the larger injectors and then eventually the 1zz throttle body.

[LtNoogie]

KK,

I too would have preferred that this was a pure bolt-on kit but I guess the word tuning must be an analogy to dialing in a radio to get the absolute best performance. While I still have this wild hair up my wazoo, I'm going to research this with consultation from my dyno guy. Believe me, Google and I are good friends.

No offense to your post but I need published numbers now for how our little car was spec'd. I've posted a request for information in the Performance thread. Anybody who can dig up published information is welcome to post it in that thread.

I have access to some of those things you mentioned. Time is tight so it takes me longer to get around to it. (it took me four months to get my gauges all hooked up)

So, have patience. If you see a Blazing Blue AT LB cream your time on YOUR autox course, ask the driver about his fuel system mods. Then refer him to me.