Breaking up help

[svtserpent]

97 cobra v1 s/trim 10lb boost, 255lph in tank, 42#injectors. -plugs look good-
It breaks up at about 5800 rpms & starts losing power. Could this be air turbulence around the MAF? maybe the warmer weather out?

Thanks
Dave.

[smooth]

Fuel pressure loss? Do you have an incar gauge, sounds like you might need a pusher pump(inline pump) I have one if you want to try it out.

[Sean]

picture of siad plugs ?


97 cobra v1 s/trim 10lb boost, 255lph in tank, 42#injectors. -plugs look good-
It breaks up at about 5800 rpms & starts losing power. Could this be air turbulence around the MAF? maybe the warmer weather out?

Thanks
Dave.

[svtserpent]

got a gauge, but what should the psi be at WOT???

[svtserpent]

No pics of the plugs Im @ work. but they look normal, little tan not black,clean.

[1BADAIR]

what are they gapped at?

[svtserpent]

32

[svtserpent]

I have an ajdustable fuel pres reg should I bump it up? its @ around 42-45 now.

[Sean]

does the porciline have a shiny appearance ? like glass ?

[svtserpent]

no, not at all.

Im stumped.

[Sean]

have you tried a fesh set of plugs? snap pics of all8 and post them up. I have sporadically seen issue with the coils on the motors but I have also seen those coils make alot more power then you currently are.

no, not at all.

Im stumped.

[svtserpent]

Ok Im gonna throw some plugs in it.

[svtserpent]

Well,
Changed the plugs last night-ngk tr6- & it pulls harder than I can ever remember.
the old plugs looked good but they all had different gaps when I checked them some at 32 some at 40??
So my old plugs only lasted me about 6-7 months. ??

[Sean]

Snap up the plug pictures. SC and Turbo and nitrous engines tend to go through plugs with a much higher rate of frequency then non power adder motors. Are you running race fuel of unleaded ? If your running race fuels I am surprised they lasted this long.

Well,
Changed the plugs last night-ngk tr6- & it pulls harder than I can ever remember.
the old plugs looked good but they all had different gaps when I checked them some at 32 some at 40??
So my old plugs only lasted me about 6-7 months. ??

[svtserpent]

Yup I try and run a 93/110 mix. OR I have the option on my xcalII for a straight 110 tune.
You still want pics??

[Sean]

if you don't mind. I like seeing plugs in various states of functioning and non functioning.

Yup I try and run a 93/110 mix. OR I have the option on my xcalII for a straight 110 tune.
You still want pics??

[svtserpent]

Got some pics they all look the same.
http://i155.photobucket.com/albums/s291/PACIFICGREENSVT/DSCN0251.jpg
http://i155.photobucket.com/albums/s291/PACIFICGREENSVT/DSCN0250.jpg
http://i155.photobucket.com/albums/s291/PACIFICGREENSVT/DSCN0245.jpg
http://i155.photobucket.com/albums/s291/PACIFICGREENSVT/DSCN0241.jpg

[dave89iroc]

how much timing it got in it?

[1BADAIR]

how much timing it got in it?
LOL you read my mind

[svtserpent]

Not sure. I could do some data logging with my x calII. I think I have an old data file on my laptop.

edit- found the old data file, spark was anywhere from 14 up to 32.

[Sean]

There mostly just lead glazed. Pretty annoying issue with race fuels these days. I did see a timming mark near the base of the ground strap however. Can't tell if thats from cruising around or from WOT at high boost. Its kind of ashy. Just change the plugs alot sooner and you should be fine. I didn't see any speckles or any other signs of things not being right. Put in a fresh plug or 2 make 1-2 WOT passes shut it off pull those 2 plugs and put 2 more fresh ones in. Then snap pics of those 2 plugs. I have a feeling alot of the heat marking on the plugs in your pics is due to cruising around.

[svtserpent]

Thanks guys!!

Im gonna keep an eye on them now.

[Blown528hemi]

Did you check the ignition?