624 bhp with a 6800-7000 rpm rev limit. You're running up over 7000. RPM is a huge stress.
Here's some food for though. A bad tune on forced induction OR nitrous on a STOCK coyote is not going to last more than 10 pulls. So if months went by and everything was fine, then blew out of nowhere, MAYBE the tunes were edgy and it was a cold night? I mean these cars have TARGET A/F and timing don't they? If they detonate, they correct. I have no + or - experiences with Lund but I believe he's tuned enough cars to know what good target values are.
If you push it on a stock block, you're taking a chance.
Everything we hear on this forum is so subjective too. One guy says he has 45k miles on his blower, but maybe he never goes over 3500rpm. I've seen so many guys be scared of their car, scared of blowing it up, and just NEVER get on it in general. Those guys will last 50k miles on a stock bottom ends, maybe 100k. People like me go a month because I'm full boost, WOT most of the time. I bought the car to enjoy it. Some just want to talk about it sitting in a folding chair at the fire dept. car show on sunday. Some want to pop the hood and show it off. I want to race, lol. Hence why my motor lasted about a month after putting a TT kit on.
I don't know where some of you people drive but to be WOT most of the time on a DD is nearly impossible where I live.
In Slidell you have some running room - not much. The Westbank isn't much better.
I don't know where some of you people drive but to be WOT most of the time on a DD is nearly impossible where I live.
I agree 1000%. I see over 4,500 rpms only a few times a day max, if at all. I see redline only when I am feeling froggy or logging.
Gotta admit, when I saw the thread title and already knew you were in southeast Georgia that I was expecting to see Tuners Inc in the thread somewhere... Just sayin'...
What's wrong with Tuners Inc ?
Haters going to hate!
I'm sorry that you lost your engine, that's never a good feeling. As an engineer this is cut and dry. You exceeded the design parameters of a mechanical assembly and it failed. You could have done more to support the increased stress or load. For example you raised the redline by 1000 rpm and didn't even do a simple valve spring change to support the increase in rpm. As rpm goes up the force on components goes up by squares or on a logarithmic scale and small things such as oil temp, pressure, windage, piston to wall clearance, ring gap, valve float, octane become much more critical. Factor in the extra heat and force from no2 that causes piston expansion. Did you increase your cooling capacity or ability for the engine to rid itself of the extra heat generated by no2? Said in another manner I wouldn't beat my worst enemies engine the way you treated yours. The engine should have been properly set up for 8 grand and no2. Proof of the pudding here is that Ford went to a different piston/rod assembly for the Boss 302 and a higher valve spring rate, larger radiator, oil cooler to support the increase in Rpm to 7500 and a moderate power increase. I purchased a track pack car to get a head start in supporting an increase in power, Proper Planning Prevents Poor Performance. I don't see the tuner having a lot of liability here.
A valve spring change isn't quite "simple" to do on these motors...
It's easier than picking your rods up out of the street.
while we're on the subject I'd love to know the current valve spring pressure on the overheated/overreved springs.
Not true it is real easy to pick up rods from the street. Getting them back in the engine is the hard part.