JustinZC

Hi, I have a problem with detonations on my ZC SOCH Vtec engine... I recently installed a Jacksonracing supercharger kit (don't flame me pleaaaaase ) with a 6psi pulley... everything looked great, until I went for a test drive...
as soon as I hit the floor with the gaz pedal, it detonates a hell of a lot... so here's what I did yet to try to fix it... if anyone has other suggestions please help me im kinda confused here, cause they say the Jacksonracing kit is supposed to be bolt on (or so):

the kit wasn't working with the FMU they provide, so I installed a VAFCII with 450cc 1g injectors...
I made sure it never ran lean with a A/F gauge (well, dide my best since it's not the most precise gauge in the world)
I put some 94octane gaz in the tank
I checked if their were any vacuum lost (none)
I retarded the timing to the maximum possible
even tryed to cutt the VTEC engagement to see if that was the problem... still detonates

anyone got some other ideas? it's not only a few little noise that I hear... it definitly DETONATES

can my timing be too retarded and make it detonate? (ive tryed it in many positions and the best seamed to be when it was retarted to the max?)
i've also read that adding colder spark plugs could help, could it be THE problem? anyways... thanks!
thanks y'all

projekteg

your timing could be retarded too much and your vafc settings could be way off also. i hate to say it, but just guessing with an afc according to your a/f gauge, and retarding the timing all the way, isn't a good/safe combination and is just asking for trouble what are the settings on the afc? did you set your timing with the afc set at '0' or with the corrections already made with the afc?

djfob

get some colder plugs then start over again with the afc..........retarding it that much isn't the greatest idea

Bakeoff

If I'm not mistaken, the JRSC leaves the Map sensor in the stock location on the TB, so it's not seeing boost....
That could be part of it. Also, where did you have the fmu hooked up? before or after the blower?

d16tuner

hUH? How many setups move the map sensor? The map sensor should see boost just fine in the stock location, unless the z6 is totally different from the y8, and I don't think it is.

JustinZC

I took the FMU off... it ran like crap when it was on... im running on VAFC and 450s now...

anyone know what % of fuel I should make the 450 send at a 6psi boost? where should I start trying ?

JustinZC

thinking to myself.... when I look at the pressure lecture on my VAFc, it,s always around the -12 -10 or so... never gets positive, is this what you mean? should it get at +6 when Im boosting?
(I don,t know much about engines and all, sorry about it)

d16tuner

When you are driving at full throttle, the pressure reading never gets to be positive? It should at least get close to zero, not staying around -10, even if the car isn't boosted at all. Something might be wrong with the map sensor I suppose if the reading never comes up when you are driving. And you do not want the FMU and afc on at the same time, so taking that off was a good call. The afc for 450 injectors should be set to somewhere around -38 just for starters.

JustinZC

I just checked, it gets to something like -1... but sure never comes positive...

d16tuner

Then my guess is you have a leak where the supercharger is connected. Or the unit itself is faulty. Or you have a check valve or something installed that is causing the MAP to not see the boost. First three things that come to me. And without seeing your setup the third sounds the most likely. Because if it wasn't building boost because of a leak, it shouldn't be detonating, it should just be running stock. And if the sc itself were broken you'd probably be able to tell by looking under the hood/listening while it was running.