Correct, if u dont have the slightest clue whats going on, I would not reccomend trying to tune anything at all let alone a piggy-back fuel system for 15 psi....But if u do have a clue and got some *****, then boost on...

 

i didnt want to coment on this but what hes doing is true,it can be done,this the way i see it you have to stay far away from that 35% without running lean,so whats the best way?up your fuel pressure,yes im running 60 psi fuel presure- 41%,i wont tell how many psi i had boost,but to be safe do it on a dyno my a/f is 11.9 across straight as an arrow

 

civicguy:::::So how much boost man???huh,huh.....Dont be shy, I wont flame you....

 

I ran the hack for 1 year. I boosted 12-14 psi daily and I never thru 1 cel. I even had spikes upwards of 18psi and I never threw a code. That was with stock injectors, stock fpr and a btm. Go figure.

 

I'm gonna have to bring the video camera down Friday night and hopefully catch this 11 second pass. If you didn't have to work there's that dyno day Saturday I was telling you about. Maybe you could swing up when you get off. I have an appointment for 9am for an hour on the dyno. Are your slicks busy Sunday, think I could borrow them?

 

https://honda-tech.com/zerothread?id=317528

 

how did you run the hack with stock injectors?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by legendboy &raquo;</TD></TR><TR><TD CLASS="quote">I ran the hack for 1 year. I boosted 12-14 psi daily and I never thru 1 cel. I even had spikes upwards of 18psi and I never threw a code. That was with stock injectors, stock fpr and a btm. Go figure. </TD></TR></TABLE>

Stock injectors and FMU is not "the hack"

 

Your fuel press must be sky high to use stk injectors and still get away with no cel on stk map

 

oh ya, sorry, DSM injectors, my bad my bad

 

Glad to see this going on in here. The only reason that I would not run high boost on factory map is that I would be afraid of actually physically damaging the map sensor. I have heard of them poping, but no first hand experience. Keep up the good work, Im a big fan of the DIY crowd. As most of you are im sure.


Rob

 

Fuel presure = 39psi base
AFC = -40, -42, -42, -42, -42, -41 ( just guess at the rpms !!! )
13psi by 3700rpms
stock map sensor on Z6 intake
8.4/1 compression
Stock Z6 internals
NEVER get a CEL.
93. oct.

I didn't think it was possible either, but I tightened the wastegate one night to fix the slow spool-up ( WG puck wasn't resting on the WG hole ) and it shot to 13psi, I smiled and looked for the CEL, but I've never seen it..

Scary thing is I ran the car non-IC'd for a week and my boost guage stopped working and I got a map CEL !!!! God only knows how much boost I was running !!! Ended up changing the head gasket with the IC install, hehe low compression probly saved my retarded *** from destorying my motor... Anyway..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis &raquo;</TD></TR><TR><TD CLASS="quote">


As far as your fuel timing at 10 psi vs 15 psi, reread this thread.</TD></TR></TABLE>

so it stays the same form 10 to 15psi. Doesn't this exacerbate the ignition problem the hack inherently has? I don't think i'll be pushing mine this far. would the msd BTM be a good piggyback on piggyback fix?

Uberdata and the like are sounding MUCH nicer lately

 

For pump gas a btm would probably do the trick......For race gas it prob. would not matter too much because of the high octane which will obviously help against detonation...

 

hmm...how come i was never able to surpass 11 psi on my stock map? i tried everything and spiking was okay because it wasn't holding the boost. after trying for the longest time i finally tried using a 3 bar and messing with my Map input/output voltage signals on the AFC and finally got it boost 14.5psi. boost transaction was perfect and a/f was around 12, but idle sucked **** since i was now running too rich.

if you're talking about using an fmu along with a fpr to raise mechanical fuel pressure and tuning the fuel down with the afc to achieve higher boost levels...i still don't see how this is possible...

so if you don't mind, would you care to show your settings on the afc so i can fully understand what you actually did.


Modified by shermanyang at 6:05 AM 11/27/2003

 

Yeah showing your afc settings would help a little bit...so it would probably be a good idea to get an msd 6a or 6aL ignition to retard the igntion timing a little???

 

Well I guess the BTM would be even better because it has boost retarding. Don't even know why I said 6a and 6aL. Dayum they expensive!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shermanyang &raquo;</TD></TR><TR><TD CLASS="quote">if you're talking about using an fmu along with a fpr to raise mechanical fuel pressure and tuning the fuel down with the afc to achieve higher boost levels...i still don't see how this is possible...</TD></TR></TABLE>

And why not?? You are basically trying to get the same amount of fuel flow to your injectors by playing with your fpr, fmu (if applicable) and afc. By increasing the pressure you are just letting your injectors do more work to allow you to trim more on the afc effectively clamping the map voltage down more so you have more room for more boost before it reaches the map voltage CEL threshold....Am I making sense??

Or you can also run bigger injectors to allow you to trim more on the afc/smc/any other voltage trimming device..

 

first off. running a missing link with an afc is not "hackin."

second, my buddy's been running 13psi for awhile now on his b16, no cel's.

and when i had my old turbo set up, i'd spike 12-15psi constantly and held it till i shifted. no cel's. go figure. just wanted to add my two cents.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swlabhot &raquo;</TD></TR><TR><TD CLASS="quote">

And why not?? You are basically trying to get the same amount of fuel flow to your injectors by playing with your fpr, fmu (if applicable) and afc. By increasing the pressure you are just letting your injectors do more work to allow you to trim more on the afc effectively clamping the map voltage down more so you have more room for more boost before it reaches the map voltage CEL threshold....Am I making sense??

Or you can also run bigger injectors to allow you to trim more on the afc/smc/any other voltage trimming device..</TD></TR></TABLE>

i understand now. so it's basically like what a lot of people are already doing...running 310's, fmu, and fine tuning with afc. but instead, running high pressured fuel and decreasing it with the afc to lower map voltage.

 

I can give you guys my settings, but they will not be 100% accurate for everyone elses set-up....Every turbo flows a different amount of cfm, so my 15 psi of boost may flow the same as someone else running 13 psi of boost....Anyway my settings are.....On the low map -35 across the board(this seems to have decent driveability)....And on the high map, 1-3k..-38%, and 4-7k..-41%...Now remember this is w/ an adj. fp regulator...If you try this w/ stock regulator at 15 psi of boost, you will be very lean and probably not get one full run out of the car before it blew up.....So I set my fuel press with the aem 1:1 regulator at 55psi.(thats w/ fuel line attatched.....Please remember not to try this unless you are expierenced with this sort of tuning,have the proper euip. or have a dyno close by...

 

are 450's the largest injectors that you can do this with, can the vafc control larger injectors? i wanna do this setup with my h22a and run about 15-16psi. would the dsm 450's be large enough with a higher fuel pressure to support my power?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RudeLude &raquo;</TD></TR><TR><TD CLASS="quote">are 450's the largest injectors that you can do this with, can the vafc control larger injectors? i wanna do this setup with my h22a and run about 15-16psi. would the dsm 450's be large enough with a higher fuel pressure to support my power?</TD></TR></TABLE>

they would be a little on the small side... I would want bigger.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RudeLude &raquo;</TD></TR><TR><TD CLASS="quote">are 450's the largest injectors that you can do this with, can the vafc control larger injectors? i wanna do this setup with my h22a and run about 15-16psi. would the dsm 450's be large enough with a higher fuel pressure to support my power?</TD></TR></TABLE>

my buddy's runnin 550's on his SI, but the problem is, on the afc, u can adjust it till like -50% i believe. so any bigger is kinda pointless. but wat do i kno? hahaa

 

I think 550s would be ok w/ this, but you would probably need stock fuel press. or maybe a little less so it would not load up at idle so much....But I would buy 550s as I confident that they would work fine....But on another note, I thought w/ the 440s my set-up was going to be maxed out at 13 psi or so, but thats because I just could not add anymore fuel with the afc w/o throwing a code....It sounds crazy but with the 550s and an adjust. fp reg., you could theoretically have the fuel for 20+ psi....But thats a whole nother topic....Maybe someday I will have some information like that to share w/ you guys....I can see it now..""20+ psi with the hack..look here"" I am sure that there would be alot of flameage on that thread...