Wow Frank! I can't wait to feel the full 15lbs of boost in that busket. Hopefully the engine will hold up a little bit longer to get 11's out of it.

 

Joey why do you even bother.. Why would someone want a stand alone when they can have a flash apex uint.. Maybe if Apex made a chip burner it would be more popular.

 

My main reason for posting this info is because when I tried to find out if this would wirk by asking other people, I always got the same old "cant boost past 11 psi w/stock map sensor" reply....I allready knew that this was not true because I have boosting 13 psi for the past month.....This is mainly just proof that it can be done....I hope everyone who uses the hack finds this info usefull...

 

so did you lean it out more on the higer boost? The way you did it sounds right and it looks too be working good for you.. the race gas is probably going to help also..

 

correct.....I had to lean out the afc to -40 across the board, and add 3psi base fuel press w/ the aem fp regulator...W/O the adj. regulator my fuel was at -36 at 13 psi of boost...Anything higher than that, it would throw a map code.....I thought this may work so I bought the regulator, and now 15 psi was no problem...I actually have some more fine tuning to do because even w/ 3 psi of fp higher, it richened things up alot....So at -40 on the afc combined w/ 55 psi of base press, my a/f is aroud 11.5......

 

preludegirl:::quit stalking me allready........j/k

 

you can use the stock map past 11psi no problem.

but you get what you pay for

platinum.

 

exactly right bro...I am not claiming this is the best engine management, however I am claiming that this is the best for the money....imo........I have tried all the other cheap fuel systems, and this is the most tunable one for the$$$$ by far...

 

I am not stalking you. You force me to put up w/ your car and stuff so I am following what you are doing to the car. j/k

 

preludegirl:::your car is slow.... ...j/k u dont have to post back...thats all I wanted to say....

 

Jdavis:::::I think I have more than 1/2 of a clue whats going on.....Maybe like 3/4 clue at the most .....I agree about your statement about getting the kids all rowled up, thats why I stressed my set-up.....wideband,race gas, etc,etc.....

 

For the money you spent on your vafc and the aem fpr you could have bought a used hondata 2b or a new s100

 

hey thanks for the tip......But remember this is a thread about people using the afc hack...

 

Nah, I didn't notice the part about C16. I retract my statement in re ignition timing.

All "boosting past 11psi w/o CEL" means is that you have your AFC set up so that the maximum voltage it returns to the ECU never exceeds 3.0-3.1 volts. By manipulation of fuel pressures, AFC settings, and running the correctly sized injectors anyone can do this. I'm glad old boy has his head out of his *** and understands how this setup works, because most of the people who post or ask about it DO NOT, and that is dangerous.

My only criticism of this setup is that after 9.25/10.65 psi your ignition and fuel output vs RPM is fixed. ~10 psi until 15+ psi, it's all the same fuel/ignition. Some people may run into hitching/bucking/bogging before they reach full boost with this setup, and if you omit the C16 it really gets interesting. If it works, it works - just keep your eyes open.

My ONLY criticism of 99lspwr is that he spent too much on an AFC. He's the exact sort of guy we need playing with the PGMFI.org stuff, helping work out the bugs and making suggestions.

 

Jdavis:::Yeah I def. would not run this much boost with no timing control w/o race gas...My whole reason for this thread is because I have answered my own question about running this much boost with the hack....I had people telling me that there was NO possible way to boost over 10-11 psi w/ the hack....so since its working for me, I thought I would pass the info along to others that would like to expierement.....I basically was the test mule for my idea about running this much boost, and so far the mule is still living with 161k + miles....

 

can u tell me if u could use bigger than 450 cc's and still contorl the fuel really well?

 

When I ran the hack my car would never throw a code even when it spiked well above 11. If you are subtracting enough fuel at the point where the map sensor is maxed out it will never throw a code because the map sensor cannot read any higher anyways. Its a crude solution though because you have to flood the engine with extra fuel using a fpr so you will have enough fuel to extend into the range where the stock map sensor is not able to see which means you will be running extra rich everywhere else. It may work but its taking a few steps backwards for efi and its not the safest solution, thats why everyone says not to do it.

 

Actually the car is not running "extra rich" at all....I only bumped up 3 psi base fuel press., and subtracted a little more fuel on the lo throttle map.....Driveability is very good...Most people would be impressed on part throttle driving if they went for a ride in the car....

 

where is the mechanical limit of the stock MAP sensor? even if you solve the problem electricly buy trimming w/ afc how long will a sensor designed for 0psi handle 15psi?

has anyone popped one yet??

also, how does the ignition timing compare at 15psi w/ hack to 10psi w/ hack? Is it the same under full boost? sounds scary

 

Why does everyone say that VAFC hack is unsafe?? As long as your A/F ratio is below 12:1 (along with necessary timing taking out or octane raised) your car is safe. It doesn't matter how you get there as long as you get there and stay there.

I am running the VAFC hack at 11 psi with timing taking out at .5degree/psi via a MSD BTM.

Sure, instead of paying $150 AEM fpr, $310 VAFC, $300 MSD BTM,

I could have payed 400 for an hondata and been better off, but still my **** is safe and my built engine isn't going anywhere.

 

DAVID555::::You have summed up my theory on the hack perfect......Make sure u have the fueltake some timing out, and you are good to go..

 

fuel, take......sorry for the grammar..

 

bailhatch::::The only thing I have been poppin lately is cherries....Well not really, I just thought it sounded cool......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch &raquo;</TD></TR><TR><TD CLASS="quote">where is the mechanical limit of the stock MAP sensor? even if you solve the problem electricly buy trimming w/ afc how long will a sensor designed for 0psi handle 15psi?

has anyone popped one yet??

also, how does the ignition timing compare at 15psi w/ hack to 10psi w/ hack? Is it the same under full boost? sounds scary</TD></TR></TABLE>

Mechanical limits are 9.25/10.65 for OBD0/OBD1+. I've popped a number of OBD1 MAP sensors running at or less than the 10 psi they can register. They seem to be less robust than the OBD0 units. I just convert to GM 2 bar these days and don't worry about it.

As far as your fuel timing at 10 psi vs 15 psi, reread this thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by David555 &raquo;</TD></TR><TR><TD CLASS="quote">Why does everyone say that VAFC hack is unsafe?? As long as your A/F ratio is below 12:1 (along with necessary timing taking out or octane raised) your car is safe. It doesn't matter how you get there as long as you get there and stay there.

I am running the VAFC hack at 11 psi with timing taking out at .5degree/psi via a MSD BTM.

Sure, instead of paying $150 AEM fpr, $310 VAFC, $300 MSD BTM,

I could have payed 400 for an hondata and been better off, but still my **** is safe and my built engine isn't going anywhere.</TD></TR></TABLE>

It might be safe but I would consider it less safe because you are running a fixed amount of fuel above 11psi no matter what is going on. It may be fine in the conditions you tune it at but I know persoanally on my car conditions tend to vary, on cold nights I often see 1 or 2 more psi of boost and the air is significantly cooler, the car feels like a whole new animal but as long as I am still within the capabilites of whatever my engine management can handle and is tuned for my car will still be running optimal. If you are certain your fuel and timing will be safe then thats great, if I was certain I would run it too but I personally would not reccommend that to someone else that is not very knowledgable in this area as there is significantly less room for error and nobody wants to be liable for someone elses blown engines. I would say the afc hack as everyone knows it is ideal and acceptable for up to 11 psi, above that its not the same concept anymore and you had better know whats going in the engine and be comfortable taking a setup like this to that level.


Modified by omahaturbocivic at 2:55 PM 11/26/2003