For the people that are using the vafc hack, how long have you guys been using it? Have you had any problems with detonation?? I'm about to run it instead of the fmu and was wondering with the vafc hack doesn't the ecu advance timing when you accelerate? Isn't this bad??



Modified by b16booster at 10:54 PM 8/27/2003

 

4 days so far and no probelms

 

i have been runing the hack for about 8 months... It is the best thing i have every done. Runs Great.. Boosts Hard...... Smooth in and out of boost......

Made my car run smooth.....never go back to check valves or missinglink..
I'm runing it on a d16a6 9 psi. i have drove to reno and back to LA many times.. boosted... same motor.. .. GREAT MOD>>>>

 

does anyone have detonation problems at all? My friend just got his vafc hack installed in his car...and tuned at garage advance in orlando fl and he said he has heard pinging and detonation twice already and has had the car for 2 weeks and he said it happened normal driving. He's got a somewhat built b20 vtec, 10:1 compression je pistons, ctr cams, titanium valve springs and retainers a little more stuff but not sure about everything he has. Could it be he's getting detonation b\c it's a b20/vtec? Kinda getting nervous about vafc now. does anyone have anymore input?

 

It's been running nothing but rich ever since I put it in. There's no power in the top-end. Midrange isn't so bad but it feels like it runs out of breath no matter what settings I put it at. Well, no worries now....the AEM EMS is going in.

 

yea i did notice that theres hardley any power in the top of the power band from like 6000-8000 rpms, but from 0-5000 it pulls like a ****.

 

yeah mine detonated with 10:1 af ratio cause it advances timing. I just put a FMU, missing link on today with the 450cc injectors and it runs awesome. great power through the whole RPM range. 15psi on stock internals with just a head gasket and block gaurd. that is the way to go if you don't have the money or time for the hondata or EMS

 

some times mine looses power at the top. but not taht often. H ad a detonation problem, but it was my fault. I re-tuned it correctly and it has ran perfect. what I mean my re-tune it...

the curve only gets richer. if you have a spot where its leaner than the rpm before it will advance the timing on you. so be careful.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostedITR41 &raquo;</TD></TR><TR><TD CLASS="quote">yeah mine detonated with 10:1 af ratio cause it advances timing. I just put a FMU, missing link on today with the 450cc injectors and it runs awesome. great power through the whole RPM range. 15psi on stock internals with just a head gasket and block gaurd. that is the way to go if you don't have the money or time for the hondata or EMS</TD></TR></TABLE>

No your wrong. It doesnt advance timing. The AFC hack will have the same timing at WOT as a FMU setup.

And about 15psi with a fmu? Thats just straight stupid. A 12:1 fmu would be 12psi for every 1psi of boost. 15psi you say? Yea thats 180psi of fuel pressure ontop of the base ~43psi (at wot). So 223psi of fuel pressure! haha yea show me a fuel pump that will do that. At that fuel pressure..you just dumping fuel into the engine since the injectors cant operate correctly.

liam

 

I have a friend that has put over 20,000 miles with the afc hack, daily driven, 10psi, stock d16y7, for the last two years. Loves it.

liam

 

It would seem to me relibility would be a function of tuning the engine safely. It is easy to consistently run rich/safe with the hack since the fuel pressure is about right for the injectors (way closer than FMUs provide). If someone blows up their engine with the hack it is not because it isn't a reliable setup so some of these responses could be misleading.
I would have to say FMU and pump setup should be less reliable because you are asking an injector and fuel lines to work at several times the designed opperating pressure. not good.
I have experiance with both setups. never seen an fmu setup break myself. I love my hack for the $. prime for $450. I don't worry about the injectors or afc breaking on me.

 

So what about the issue of the ecu advancing timing when you are accelerating? I know boost isn't good with the timing being advanced?? Does the vafc hack eliminate this factor? if not is there a way? or should you just really retard the timing by using the distributor??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16booster &raquo;</TD></TR><TR><TD CLASS="quote">So what about the issue of the ecu advancing timing when you are accelerating? I know boost isn't good with the timing being advanced?? Does the vafc hack eliminate this factor? if not is there a way? or should you just really retard the timing by using the distributor??</TD></TR></TABLE>

It doesnt advance or eliminate timing at all. The honda ecu will give the same timing it always did at WOT - now that being good for a boosted engine is another thread all together.

The only real time the afc hack can cause large timing is at low rpm, in boost, and part throttle. This is because the honda ecu advances the timing at low rpms and full map voltage - to improve low end torque.

At WOT, the honda ecu is going to see full throttle (of course), and full map (with the afc hack and the fmu setup), so its going to use the same timing maps it would use without the turbo. (remember with both the fmu and afc hack, your just hiding the fact that the motor is turbo from the cars ecu)

Now of course the normal honda WOT timing maps arnt the best thing in the world for a boosted honda. So i recommend starting with -2 or -3 degrees from base. I was at -3 degrees from base timing and never had a problem with 10psi. Although on days of 100 degrees or more and 91 octane i get some pinging and the car isnt very happy - so i lower the boost to 5-7psi and everything is happy.

liam

 

wow the part creator speaks and passes his wisdom on...but on another part been using mines for several months no real problems at all...but will the 3bar map sensor solve the 11 psi boost limit while still being as reliable??? i kno i need to re-configure the afc...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg6turbo &raquo;</TD></TR><TR><TD CLASS="quote">wow the part creator speaks and passes his wisdom on...but on another part been using mines for several months no real problems at all...but will the 3bar map sensor solve the 11 psi boost limit while still being as reliable??? i kno i need to re-configure the afc...</TD></TR></TABLE>

hehe thanks

As for the 3bar map sensor mod. Ive heard it can work but when your pushing your motor that hard, and maybe you just done care, but having a good fuel system becomes ever more important. Personally i feel anything past 10psi and you should really start thinking about good fuel management. Its too easy to blow something up with bad tuning..and 10psi+ its just that much worse.

liam

 

&lt;-- used it for 6 months +/- on the Civic with no problem. My GSR on the other hand doesn't seem to like it, but it's got issues of it's own

 

8000miles boosted. running 10psi now and never heard any signs of detonation. hard to get it leaner than 11.0 afr, but i'm on the safe side with that. run a btm at .33 degree per pound of boost. works for me.

 

in response to Liam:

I am maxing the 255lph HP out. that is the idea. max it out with 450's and you can run massive boost. the afc hack is junk. I am runnin 15psi with a 12.1:1 af ratio to low 11:1 af ratio across the board. I think if inline pro runs that set up on street driven 11 second cars it is a good system. talk to jinxproof and autoEX they BOTH ran this system to the 11's

 

I was running it in my car I liked it. It did have the part throttle kick but then one day at the track it lute lose cracked the sleeve. I’m going to run it with my new set up but I'm going to retard the timing to 11 degrees. I’m working on getting the Gettodyne in the car and seeing how that works.

 

Hey liam, i live in florida where the weather is so unpredictable especially in the winter, you said on days of 100 degrees + at 10 psi you get pinging so you lowered the boost....i don't have a boost controller so could you just change the fuel settings on the vafc instead?

 

or you could use a btm and take out more timing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16booster &raquo;</TD></TR><TR><TD CLASS="quote">Hey liam, i live in florida where the weather is so unpredictable especially in the winter, you said on days of 100 degrees + at 10 psi you get pinging so you lowered the boost....i don't have a boost controller so could you just change the fuel settings on the vafc instead?</TD></TR></TABLE>

yea but you can get 93/94 octane gas

 

okay. so by liam having 91 octane and i having 93 octane i will be safer?

 

yes

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16booster &raquo;</TD></TR><TR><TD CLASS="quote">okay. so by liam having 91 octane and i having 93 octane i will be safer?</TD></TR></TABLE>

much safer! When i was in texas i never had a problem running around on 93 octane in 100 degree weather!

good gas =

liam