Safe amount of HP for stock engine?

370zproject

(pops in) ITS OVER 9000!!

1slow370

or just have the darton sleeves installed with the 100mm bore and besides having a block you couldn't blow up you would have around 4.2l

G37Sam

Naaah I'm sure it's more of an ignorance thing on your behalf, could you even pinpoint Dubai on a map?

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StillenZ

I guess someone can't take a joke, but that's their own business. I just happen to have always liked Dubai and did many research papers on the area in college. I would hope that I could point it out on a map Sam, but couldn't promise you anything. If you haven't noticed, this isn't the first time I've given you **** about Dubai. Like I said, I just happen to like the area... Enjoy yourself on those beautiful roads.

And to follow up on your "ignorance" comment. I know that some questions are just ridiculous and I guess each person has there own opinion on what an ignorant comment is based on there knowledge of a certain topic, but it was simply a joke... sorry if I offended you with my sarcasm..... 1

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RCZ

kiss and make up.

G37Sam

My bad man, you know how the interwebz are when it comes to jokes being misinterpreted

No offence taken

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FuszNissan

I need to patent a sarcastic font.

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1slow370

yeah the lack of tone expressed through forums and texting really is a pain but i think thats why they invented this =

StillenZ

I am right there with you man... Like I am a sarcastic @$$hole, but rarely run my mouth in a serious way... hook me up with that font when you get it.. I can see it now "Sarcismo" or maybe just "Sarcasm" would work.. and Sam I guess I need to admit that after I re-read my statement to you, I can see how I might of came off the wrong way... shoulda added a or something to that effect lol my bad.

Semi-on-topic: How can I put 20 psi to my Z? .........lol jk sorry there's that sarcasm again. but for real: I'm a newb and I know this is a dumb question but I just want to know if I understand this right... If I lower the compression on my engine to go some sort of F.I. route the purpose is to make it safer to run boost/more boost/lots of boost? and when you lower compression on a N/A engine, will it lower horsepower (without F.I.)?

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G37Sam

Yes it will, when you lower compression you running at a less Volumetric Efficiency basically.

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StillenZ

Thank you once again for the answer... that was what I thought but I wasn't positive... and the engine would be like 10X's more reliable running boost as oppose to stock compression with boost?...

Reliability is just a big concern for me when it comes to the F.I... I feel like I know a lot about cars but I'm sure it just barely scratches the surface when it comes to being able to understand or let alone, work on my own turbo vehicle. I'd really like a reliable 450 horses... I hope one of these companies can do it for me.

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G37Sam

You can never know it all about cars, my professor back in uni had a PhD in internal combustion engine and I still corrected him in a few circumstances lol Then you walk into some threads over at my350z and I swear you feel like you don't know anything about cars.. we all live n learn.. and the best way to do that is to research and read, trust me.. it works

As for reliability on a stock block, you really don't want to go crazy a nice 6-8 psi with the stock compression and you should be fine.

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1slow370

it's not volumetric efficiency that will remain unchanged (amount of air entering the cylinders relative to actual displacement) you just lose overall efficiency because it won't burn as explosively with the reduced pressure(less horsepower per liter) higher compression yeilds higher fuel economy and about a 5% increase in power for every point of compression added without adjusting timing. So if you ran 12:1 compression without detonating you would see about a 5% increase in power. Similarly if you dropped from 11 to 9:1 you would lose 10% of your power but you would be able to run enough boost to more than make up for it. Say the highest psi you could run on the stock motor was 10 making 600hp, you go to 9:1 you would only make 540hp. but if you added another 10 psi thanks to your reduced compression allowing it to not detonate you could make 795hp. if you run that same 20psi on a motor with higher compression you could make 834 on 10:1 or 874.5hp on 11:1 but it would probably detonate and blow up.

G37Sam

Yeah I meant to say thermal efficiency my bad

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StillenZ

Lol lol <------ (mind blown)

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