Cylinder 7...going deeper

[jdsgn]

Like others have stated, you have an awesome attitude but don't beat yourself up. There is nothing more or less difficult to tune with manifolds vs without. Headers would not have helped. The stock z28 manifolds are pretty good. I skimmed this thread but I would look for a bad injector or injector harness? Maybe trash got in that injector some how?

[Stephen12ZL1]

Originally Posted by jdsgn

Like others have stated, you have an awesome attitude but don't beat yourself up. There is nothing more or less difficult to tune with manifolds vs without. Headers would not have helped. The stock z28 manifolds are pretty good. I skimmed this thread but I would look for a bad injector or injector harness? Maybe trash got in that injector some how?

injectors were fine and the harness was fine. I am going to step up to the appropriate 60# injectors for the next motor with a tune which is safe for road course action. Part throttle lean condition/detonation caused this carnage.

[Zslash28]

I may have missed it, are your plans to fix the factory engine sleeve?

[Stephen12ZL1]

Originally Posted by Zslash28

I may have missed it, are your plans to fix the factory engine sleeve?

no...not worth the hassle. Fix is potentially sketchy unless all of the sleeves are changed. So, I am going with an ERL forged shortblock.

[2NASSTY]

Sorry to hear about this Stephen. I know you will come back stronger than ever!!

[Stephen12ZL1]

Originally Posted by 2NASSTY

Sorry to hear about this Stephen. I know you will come back stronger than ever!!

[Azzkker]

Originally Posted by Stephen12ZL1

Yes, he was using a wideband in the rear 02 bung when he was dyno tuning. I should have been running a "7" heat range as evidenced by the location of the line on the electrode. I'm not sure how much timing I was running. No accessory gauges are presently installed...that may change.

By rear o2 bung do you mean after the cats? If so wouldn't that screw with the readings?

[Stephen12ZL1]

Originally Posted by Azzkker

By rear o2 bung do you mean after the cats? If so wouldn't that screw with the readings?

tuner said either was adequate for the A/F

[Dropspeed]

Originally Posted by Stephen12ZL1

tuner said either was adequate for the A/F

For accurate readings the wideband must be installed before the catalytic convertor.

[Frans96ss]

Originally Posted by Stephen12ZL1

injectors were fine and the harness was fine. I am going to step up to the appropriate 60# injectors for the next motor with a tune which is safe for road course action. Part throttle lean condition/detonation caused this carnage.

Stock injectors are fine unless you switch to a Fast/msd intake manifold.... This was 100% caused by the tune. I have honestly tuned this exact setup in over 100 cars... never had a single issue.... its simple a terrible situation. A very expensive one at that.

[L99CAMA2011]

Originally Posted by Stephen12ZL1

Just took off the intake last night to see what type of damage lurks deeper. Tune was possibly too lean part throttle and I was getting some detonation at weird times during my last track outing. To be continued...

Wideband AFR guage for me baby. I honestly think we should have one on our cars if tracked regardless. Also is this possibly the culprit of having you car tuned with the AFR tool installed after cats and resulting in an inaccurate tune. An expert told me that either you install in that rear location if you are catless but with cats the bung would have to be put pre cat for proper tune.

[Dropspeed]

Originally Posted by L99CAMA2011

Wideband AFR guage for me baby. I honestly think we should have one on our cars if tracked regardless. Also is this possibly the culprit of having you car tuned with the AFR tool installed after cats and resulting in an inaccurate tune. An expert told me that either you install in that rear location if you are catless but with cats the bung would have to be put pre cat for proper tune.

I wifeband is a tool for tuning. Once a car is tuned there is really no need for a wideband AFR gauge unless the car has a known issue you are watching for. Usually by the time a driver notices the lean or rich condition on track it is too late and the damage is done. Most people think the dancing lights or readout is cool, but they are mainly for show on most cars.

The only situation I had a wide Installed was on a turbo car that would crack manifolds at the collector. At idle I could tell by the AF it had cracked again but never looked at it at WOT. After 4 manifold cracked I went back to the stock log manifold and pulled the gauge.

[Unreal]

Sucks to see. As Fran said, LS7s can handle heads/cam just fine. I've tuned 20+ of them personally, never had one pop, or any issues.

As for as a tuner picking up a bill, unless it was gross negligence I don't agree. A stock motor can fail. If people though tuners should pick up a bill when ever a motor pops, then tuning cost would be through the roof, and a lot of people just wouldn't tune. Customer accepts responsibility, and If they choose a tuner that is aggressive or doesn't know what they are doing, that is on them. Stephen has the correct attitude.

One of the reasons I will only tune for close friends now is this attitude. I make too much at my day job to deal with the stress of people blaming a tuner for every little issue.

[Dutchman427]

When you get your motor done, make a trip up to PA and have Mikey @ Rapid tune your car. You wont be disappointed.