jagged dyno graph = detonation?

[Reign_Maker]

YOU SIR ARE NUTTY!


What SupraAng said might be your problem, yur WAY too rich... You might be dumping so much fuel that it's not buring properl;y and giving you a misfire, aka, the opposite of detonation... So much fuel you put the fire out... Are you running a stand alone? Or factory ecu? Pull some fuel and try again... You should be, well, this varies from member to memeber, but I would say, you should be about 11.5-12.5:1, you should get richer as the boost increases... So, lower rpm should be 12.5:1 and move into the 11's at you run up the rpm's...

Good luck...

BTW: how is compression? Hmmm? Is your tranny slipping?

 

[isnms]

well that figures :crazy1:

still stock computer. i have an safr and getting it tuned is one of my very next priorities.
compression, i don't know.
:icon_idea but you get +1 for bringing up tranny. my clutch pedal has a bad pulsation when depressing it. and when at idle in neutral i can hear and feel it vibrating. clutch is getting replaced soon too. you think that vibration was picked up by the dyno?

 

[Reign_Maker]

Well, that MIGHT be your problem... When I pushed my stock auto with 115,xxx miles on it, the dyno was a little jaggedy *NEW WERD!* and my tuner said he thought the tranny was slipping, so we backed it down... My car actually made MORE power than that dyno, but we de-tuned it so it would be more street-able... But what you feel as a little vibration, the dyno might be seeing as the jaggedness... *FUN WITH JAGGED!* So, in essense, the dyno is much more sensitive to the slightest alterations, like yur tranny slightly slipping...

WOW! Imagine it could be THAT simple? I sure hope so buddy... I'd love for you to have a nice clean arch in yur power band! Good luck man...

 

[SuprAng]

preignition and detonation are not the same thing

detonation is when the plug sparks before max compression it makes the pinging sound
Preignition is when air fuel ignites without the spark plug. Both are dangerous, they sound similar but not the same.

What plugs are you using and what boost are you running,10.3:1 afrs are way too rich, dont run so rich or you could damage your rings. Just tune it better. Dont worry about knock for now, trust me you dont want to know how valuable knock sensors are when youre pulling fuel via an afc.

REIGN MAKER what turbo was that graph on? CT upgrade? EDIT: NEVERMIND REREAD IT... DOnt make fun of stock fuel, i ran upwards of 19psi on 91 octane, stock pump, lines, fpr, and 680s a t04 and got 11:1 afrs.

Ang

 

[isnms]

plugs ngk BCPR6EIX iridium at .030", boost was ~9psi.
all fuel supply is stock. ecu is dumping all that fuel in. man i can't wait to get my safr tuned.

I'm hoping, for now, it's just the vibration in my clutch that the dyno saw creating all the jaggedness

 

[SuprAng]

Run more boost

 

[isnms]

i meant to up it to 10 on my second run, but i hit fuel cut if i go above 11.

 

[Reign_Maker]

i meant to up it to 10 on my second run, but i hit fuel cut if i go above 11.

Then get a lexus afm... :icon_bigg

 

[isnms]

I do have that, but was waiting/intending to do that entire upgrade at the same time. want to keep the ecu happy.