He recently got the new VAFC installed and wanted to know some tentative settings he should use.

He lowered the VTEC cross over a bit....but says the car feels a bit laggin.

any help is appricated.

 

There really isn't such a thing a a tentative setting. Every motor/car is different. When you use someone elses setting you are at risk of many things including leaning out the motor=damage. The only real way to tune a vehicle is on a dyno with a wide-ban o2 of sorts. If you don't have access right now leave the controller alone until it can be done properly. Dropping the VTEC cross over point doesn't always do any good. On my ITR it was fastest on the dyno form 25-105mph in 4th with the VTEC left at the stock setting (stock cams). TRUST ME do it right on the dyno , until then leave it alone.

|Mattj


[Modified by Dropspeed, 9:12 AM 9/13/2001]

 

yaya, but someone who has similar mods could give him a starting point here... ie: try leaning it out by 15% at idle and richening up at 5200 by 10% and move vtech xover to 5400... Something roughly like that... I'm sure someone has some simple settings, so I'll post just to put it ttt... We all know that he'll have to get his azz to a dyno to fine tune, but no sense in starting from scratch...

 

With the mods you have I highly doubt you need more fuel. The factory ecu comes pretty rich, if anything lean it out 3-5% (5500-8000)on the upper rpms. Leave the factory cross over vtec point alone, you will lose power by setting it lower.

The way to make power is to run your car on the lean side ideally around a 13:1 af ratio, lean it out to make more power.

 

F that moron....


you need to lower the xover point around 300rpms and add a touch of fuel from xover all the way to 7Kish.............


[Modified by B18CXr, 8:16 AM 9/14/2001]

 

Speaking of Moron, This guy the other day told me that with his VAFC he could get 20+ whp with just an exhaust and AEM. This was in an Accord....I almost crapped my self when he said that. He will probably drop his motor by the end of the semester! Anyway, Just talk to those who know.

 

[QUOTE]F that moron....

I just want to clarify who the Moron is?

Second, You guys just told him to do opposite things, whos right? Take the thing to the Dyno and be done with it.

Mattj

 

With i/h/e, my xover was set at 5200...

With the Toda B setup, my xover is at 6200...

 

I anyone has any doubt as to who the moron is on this post.......please seek professional help.

Once again, lower the xover and add a touch of fuel till 7kish..

 

What?! I couldn't disagree more...

With i/h/e I had a huge spike in my plot which was aided by both lowering vtec xover and adding fuel. This produced 176whp with stock cams/valvetrain/revs. The torque curve was extremely linear as well...

 

[QUOTE]I anyone has any doubt as to who the moron is on this post.......please seek professional help.

Once again, lower the xover and add a touch of fuel till 7kish..[/QUOTE

Is the moron the one that is telling him to add a "touch" of fuel? WTF

Mattj

 

This tune resulted in 177whp on my car with JDM 4-1 and AEM CAI. Stock exhaust. Plot available, if you wish.

I think we've shown a few examples why this is a good idea, no?

 

Thats not the point. I was wondering why I was a Moron for advising going to a dyno instead of guessing or using someone elses setting. You wouldn't beleive how many cars get onto the rollers with settings that are "borrowered" from a similar vehicle that are not correct for the application.

Mattj



[Modified by Dropspeed, 6:56 AM 9/14/2001]

 

Uhhh, Jack, with basic i/h/e, you still need to lean out the top end .....

5,300-5,400 x-over, bell curve it from -5% to -3% back to -5%, with the peak at the x-over you choose.

Picked up decent 3-5 accross theboard after doing this on mine with AEM cai, Comptech cat back and 4-2-1, cam gears at +1 intake, -4 exhaust, and underdrive pulleys, f.p.r. set at stock 52 psi off vacuum.

Adding or decreasing from there netted me less in most of the range. Adding fuel did me no good at all, even going up to 5% just for testing. Leaning it out worked best in every run.

 

Hurell wanted me to ask about 2000-5000 rpm if he should leave it alone or lean it
out a
bit? That's were he says his dead spot is.

 

Its an R motor .... what does he expect, Viper torque in that range?? Yes, lean it out a little like I showed.

 

Matt - I'm not contradicting that statement at all. I fully agree that any tuning with a V-AFC should be done on a dyno. Mr. Man asked for a starting point, and we are relaying information about our setups that may give him that starting point. There just happens to be some disagreement on what that starting point should be.

RE: the moron comment: I don't know you well enough to call you a moron. That statement was made by someone else.

 

erm, too many variables: you have cam gears dialed in and fpr, pulley's...

That is too far from a basic i/h/e setup to be comparable to Hurell's, imho.

I did notice with just an aem cai, I was running a little lean though. That was a while back...

 

Yea, i say leave it be ... maybe lower vtec 300rpms, but i wouldnt play with fuel.
But B18CXR knows his shiet, he has dyno'd many a b-series motor.
Tho you could make your car slower by adding or removing fuel, because no 2 cars are identical.
LATES
PATRICK

 

My point was, even with all the basic bolt-ons I STILL had to LEAN OUT the entire curve to get the most out of it .......

 

There's really no specific setting for vtec controller or fuel controller units, just remember all cars are different and to get the best setting you'll have to throw it on the dyno.......go get it tuned...i mean get the car tuned with the v'afc


[Modified by AllMotor_2.0L B18C5, 7:13 PM 9/14/2001]