Barring some catostrofic part failure, If your builder builds to the factory specs (well actually adds some more tq to the head studs for FI motors), and uses quality strong products.....AND THE OWNER KEEPS UP ON MAINTENANCE, there won't be that many failures.

That being said you have to keep an eye on your oil. Remember when you beat on the car you HAVE to change your oil more often. Even with synthetic. Plus its cheap insurance to monitor whats going on in the engine.

Also for FI octane is your friend. I'm amazed how many people want to push the limits of 93 octane (or even 93 octane w meth).......higher octane fuel is such a cheap insurance.....lets even assume 100 octane at we'll say $6/gallon (probably high) compared to 93 now at $3/gallon here (woohoo)
Assume you spend $6K on your motor/install if you blow your motor due to detonation from pushing limits of 93 you need to pay $6K again right....well thats a 1000 gallons of 100octane then....even at 6mpg (which is around what I get on the 25pi tune on 110), thats 5000miles

so in summary.......oil/general maintenance.......octane........common sense stuff

Tom

 

The fact of the matter is, a warranty on an item that WILL and SHOULD be abused is tough to come by. The problem is the VQ motor was over-engineered for 300 crank hp. But how far over that even with some upgraded bits will it retain a "factory like" reliability, we'll never know. Small shops just don't have the resources to test and test and test all the different setups that they will do on customer cars. If they tried, they would very quickly go out of business.

Try getting a new GT-R covered under a factory warranty after taking it to the track a few times and doing a bunch of "VDC off" launches and subsequently breaking something in the driveline.



It's not a mentality, it's a fact of life. Get used to it.


I take nothing for granted on my car. I do all my own work and tuning now and if something breaks, I take full responsibility. IMO more people should do the same.

 

ONE MILLION MILES?!?!???

+1 And LOL @ the OP too.

Agreed.

 

Remember this thread Sentry???
https://my350z.com/forum/forced-indu...les-abuse.html

Yours is post #3 and Sharif's OP answers many of the questions you posed in the OP of this thread. LOL

 

^^^^


[/thread] .....

 

properly tuned car shouldn't detonate. why should i spend money on 100oct , just for insurance, when it's tuned for 91. when it's tuned for 91 and if I'm using 91, I expect my car not to detonate. so you're saying if it's tuned for 100 at high boost, I should use even a higher octane for insurance?

 

Slight ownage?

 

I've been here long enough to know what I'm getting into when buying a built engine and I already know what I expect of a built engine for my own purposes

I started this thread is to have the range of opinions layed out because evidently, there's a pretty wide range of expectations.
I would have made it a poll, but I was wanting more options than a poll would allow.



I think some people don't know the pros/cons of what they're buying, believe what they're told without doing enough of their own research, often have unreasonable expectations or assumptions - especially if they're pioneers.

Way back when people first started building their engine, no one had a clue what issues would come up with sleeves, how much power the VQ could hold and for how long or how much abuse it could take. When we started finding those limitations, some people got really pissed off their engine blew while others weren't all that surprised and just sold the car or bought another engine.

I think there's more knowledge out there now and by now people should start seeing some amount of pattern to what the VQ will probably do.

 

No a properly tuned car shouldn't detonate. I'm just saying octane is a cheap insurance for someone who feels the need to push the edge. If you are tuned for 91 and your tuner knows what they are doing then you'll be fine.....but if atmospheric conditions change (i.e. temp drops 40 degrees lower than when you were tuned), and your computer cannot compensate.....then it makes sense to add some higher octane to be safe, right?

 

I'm not sure how much it'll help, but mixing some 100 oct with a 91 won't be a bad idea, i suppose. I'd depend on low compression and tuning, mainly, to avoid any detonation. stanalones like Fcon adjusts to the outside temp.