OK...1st post and really need some help. Had a Radix installed on 04 Avvalanche along with Dynatech Lt's and Corvette shift & servo kit. The 2 latter were on Magnusson's recommendation. Put about 500miles so far and get the tune to work. Right from the start I got an engine lite (300 code - intermittant ping). The light came on after about 1hr on the hway and only @ vaccuum (O2 sensor??). Power band seems unusual as its all top end. Already had a Nelson tune so got an update and had all kinds of probs getting Allen to read my sepcifics before sending out an update (up to #3 now!). its been very hot & humid here in the Northeast so that not helping. Magnusson tells my installer they don't have a superchips tune to support the LTs and I need to go back to stock! Its been 4wks now and nobody seems to know squat! I've fast concluding I gotta spend another $600-800 to have dyno-tuning done on LS-1. Again tho, haven't found a soul out here who has any experience with a Blown Chevy 5.3!!! R/

 

2 latter meaning vette servo and shift kit? Not the LT's? I though Magnusson recommends the Dynatechs? Hmmm. So your mods are only the radix, shift kit, servo, and LT's? Oh and of course a Nelson tune. If you have a custom tune then you need not to worry about the superchip tune. DTC 0300 means "Engine Misfire Detected". Not sure about the Intermittant Ping? Start simple with a miss fire. Plug wires, spark plugs, bad gas..does your installer have experience with "Blown anything"? Go through the install very carefully if your installer is just a mechanic and not performance mechanic....no offense, they don't normally deal with removing intake manifolds and replacing with a supercharger every day might of missed something, crack a plug. Start simple. Don't jump into a dynotune to fix stuff. You'll usually leave with your tail between your legs.

 

Go over and doublecheck the torque on the intake bolts. Be patient, and make SURE you get all of them to 89 inch pounds. Tighten from the center out, too. They're a major pain to reach, and get torqued right. You might also talk to Magnuson about sending the handheld back to them to make sure the tune is correct. Mistakes CAN happen, but give them a chance to make it right. I'm SURE they'll be glad to try to help ya. They're customer service is second to none! Also, try giving Jesse at wait4meperformance a call, maybe he can help. His add is ------------------------------------------------->
in the sponser section

 

2 latter being servo/shift kit and LT's. Now they are saying they can't support a tune for the LT's!!! Already changed the wires to MSD 8.5's and NGK plugs. Installer is experienced shop - altho mostly BMW race cars - but has some some Vette's and SS trucks. Install has been rechecked with Mag a few times and we're all sure that not the prob. Several posts at other sites suggest that Radix & Lt don't mix. R/

 

I'll double check the torque parameters, but we've reviewed the install with Mag a couple of times already. I've let my installer deal with them 'til now, but he tells me they offered to take back the Radix as they don't support the LT tune. After 4wks and 500 miles with the same prob, I think they shuda solved it by now!!!

 

You did install the Magnuson tune on a stock pcm, right? Not on the tune you got from Allen. It sounds like a tuning issue, but I wouldn't jump into a dynotune just yet. You have good fuel pressure, and boost, right? Belt not slipping. Just kind of shooting from the hip, here.

 

Sperchip installed on OEM PCM. 12.2-.4 A:F on Superchip @ 6lbs boost. No belt slip that I've seen...93 octane...all the obvious stuff. With Nelson's last update the A;F was high 12's @ 6lbs, and all runs without any engine lite, but he forgot to VIN it so have other issues. Power band is all up top as well. On Mag's superchip before I got the 300 code we dyno'd it @ 330RWHP & 374ftlbs torque @ 6000 RPM (had 6k limiter). R/

 

are your LT's coated? if they aren't, they can heat up the engine bay quite a bit, and I have heard(although never experienced) that uncoated headers can cause problems, even ss headers. I doubt the problem is your Radix kit, and would suggest taking the time to figure it all out.

 

oh yeah, make sure you turn that traction control off.

 

I had a misfire in the beginning...it was a cracked plug. Worked under intense load but under 3K it would take a crap here and there. LOL, you haven't seen the half of it yet...you'll probably start throwing 1153 and other heater codes (135, ect) soon as well with those LT's.
I definitely don't see the radix being the culprit for a misfire as well....especially a random misfire code. I am not so sure about a tune either. All do respect to jesse and allen, but those tunes are pretty cookie cutter to some extent. But, never say never...have had my tune isssues before (my own...not Allen's or Jesse's).
Experienced mechanic, double checked everything, Magnus not supporting LT's. What did Allen say about the P0300? So you didn't get your code until Allen's tune?How quick did you install Allen's update to the PCM after your superchips install?

If it's not simple it's usually cam related...but you didn't mention a cam. And only 6psi...hmmmm...