You're making the massive assumption better fuels are readily available to all, you're making the assumption that everyone wants to run methanol.

Which is dumb.

Of course if you wish to use race fuel or ethanol, you can easily use higher compressions. That is an entirely different topic.

 

We are talking about adding meth as well so I'm assuming you have an alternative fuel source. Even if you don't correct tuning on an LS engine with pump gas should yield decent results. Nobody's gonna be pushing the envelope too far on basic 91 octane.

 

With a suitable build...they easily could though. Certainly won't be doing it with excessively high CR though.

And the fact the OP queried meth...presumably he does not have good fuel available to him

Of course, the OP has still given pretty much zero useful information as to his intended application, yet people are still billowing out nonsense telling him what he needs. Strange really.

 

Even 10:1 is low. I made over 700rw with a sbe LS2 for over 10 years on 93. Sold it when I bought my GS. Car is still running strong. GS making same power on 93 too.

An oem is going to be super conservative with their engines. Designed for the masses to be run on 91.

 

Yup!!! some people just want to argue. I was at 12:1 making 700. Regular pump gas... and I later add boost, motor untouched...

 

If it were possible I would prefer to maintain a methanol-free setup, as there are no methanol dealers in the area, and having a large tank in the garage with which to refuel the C6 daily would be problematic for my garage space.
For this I am trying to find out more about the advantages and disadvantages, even if I decrease the compression, the engine power would not suffer much because I can increase the pressure of the turbo much more than I could with a compression of over 11: 1

 

And still you have not given any goals or expectations, or even the application.

But at least you are listening to sense and hopefully going to aim for a sensible and safe CR and ignoring the race fuel/meth junkies who just don't get it.

 

my goal is to be able to reach 1000 horsepower at the power bank, I should use the car on the road, normal petrol if possible, and install a 3-stage boost controller, so that I can keep the engine at 5-600 horsepower normally and sometimes bring it to maximum power to have fun without overdoing it.
At first I was orienting myself on twin turbo, but now I'm evaluating a supercharger among the various models that I have known with the precious advice of the forum, for which I thank everyone.

 

If you're wanting 1000hp on 93 and nothing else, you will need to keep CR sensible, and a larger motor will make it much easier to achieve. It will be easier with turbos, however fitment into the vehicle may be easier with a blower.

Really, for 1k on pump fuel only it'll need a decent sized blower.

If you have ethanol or other fuels available, obviously that changes everything.

Although if Summer can build and tune you a setup to make 1000hp on 12:1 CR and 93 octane.....go for it.

 

Using low compression pistons just means you'll have a harder time making more boost to achieve the same power. Meth is a proven and great mod for these centri cars

 

Fixed.

 

And because you will not be knock limited, you have the option of making more power more safely vs the setup that will be knock limited.

 

I don't use GM knock control anymore in my Z, so I'm good there.

 

That has absolute nothing to do with what I'm talking about.

Unless you not having them changes physics.

 

In that case, you're right. I don't have the foggiest clue what you're on about.

 

Quite simply....with a poor combination of fuel/CR/boost.....you will never be able to reach the optimal/MBT timing for a combination because detonation will always occur first.
This is never a good way to run because of the risks of too much timing causing destruction. And running too low timing can also have negative effects. Although for most people who only do short blasts, and not long duration pulls or racing....not a huge risk unless you go daft with very low timing. But running low timing, you're always giving up power too vs running what the engine would actually want...but is prevented from being able to achieve.

On the other hand, if you have say either race fuel, low CR, low boost....you could see a scenario where you might be able to advance timing until the cows come home, and sort of never see detonation....although that too is bad, because there will still, be an optimal level of timing to be determined on a dyno.

In short, ideally you never want to be knock limited, which almost any high CR/pump fuel/boosted setup will always be because the combo just cannot support it.

Now yes, you will want to run the best fuel, the highest CR, whatever that your chosen fuel can support, whilst also allowing MBT timing to be achieved without the risk of knock.. That will be the optimal setup.

At Summers 12:1 and boost on pump....that is never going to happen. Timing will always be very low unless he's using a huge cam to reduce dynamic CR, and lots of rpm's and/or very low boost. Even then I'd say it's a silly combo on 93 fuel only.

Race fuel etc with their resilience to detonation obviously allows people to push higher CR's, boost etc without that same risk of knock or detonation, although you can then get into a scenario where people just throw timing at it regardless, which when gone too far can still have negative consequences.

Yes methanol injection too does offer opportunities in pushing the limitations of using pump fuel...but not without some risk too.

But I'd still like to hear Summer's combo for a totally safe 1000hp on pump fuel only with 12:1 CR.