Quote:
Originally Posted by toohighpsi
Pistons in the LTs are not weak, I've been to 800 wheel on stock LT1 bottom ends, but they won't handle mistakes well - the most common of which is lean/knock. You cannot count on a wideband to make sure you're not lean, with DI the fuel has to be injected within a certain window, if you're outside that window the fuel will still be burned and the O2 sensor will still show favorable ratio, but the actual combustion process will have occured without the fuel that the WBO2 displays. Rail pressure as well as injector pulsewidth are critical to keep an eye on, especially if you like to run at teh edge of the envelope.
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Quote:
Originally Posted by Dysan911
What Rail pressure do you think is considered safe? Like it should never drop below what numbers?
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Commanded
Quote:
Originally Posted by USAFS197
There’s always outliers in every situation. I, however, cannot think of a situation where I would be willing to boost my LT1 and not put aftermarket rings and pistons in place. Modifying engines is always risky and inherently comes with potential failures. However, if I can mitigate the chances of failure by a considerable margin, you bet your ass that I will put forth the effort to do so. I have always been of the mindset that I would rather over build and under perform, than vise versa. Granted, a bad tuner could undermine all of this.
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Agreed because at the end of the day it will always be your decision.
Quote:
Originally Posted by Dysan911
Wow this thread really inspires confidence!. :( I went into boosting my LT1 thinking here we have a lot of people doing it successfully and as long as you're reasonable with the power your making and have the fuel and a good tune you can get away easily without a problem but now it sounds like the LT1 is the worst motor ever to supercharge and it's not IF but When it's going to go.
I have several pulls to redline, many WOT runs, dyno pulls, etc. Does this mean my rings are obviously not .007 because it didn't fail yet or I'm just rolling the dice over and over?  |
There are more people doing it successfully than not, but it is always the case you only hear about the broken ones then the scare tactics come in to play.
Quote:
Originally Posted by wnta1ss
No reliable way of knowing what your rings are unless you take the motor apart. In which case, you could obviously fix them or install forged pistons and new rings.
The reason that I am stressing this ring situation is, most of the posts on the board about supercharging the LT1 have been painting a pretty rosy picture. This gives something of a sense of overconfidence. I myself bought a supercharger with that incomplete information. Now that I know the risk when using the supercharger for my purpose (long runs) would have been very high, I gave it up. We need to make our individual choices, which are best done with more information.
Since Mr Jannetty is already tuning your car, then the things he discussed about reducing the heat in the rings via the tune are probably already in your tune? As far as extra steps to try reducing the heat, there would be adding water/methanol injection or straight methanol injection. Yet another would be to convert to E85. This last one for you, I think that you'd probably have to go back to a larger pulley (slow the blower down). Less boost would be because LT4 fuel parts are not very big, so I tend to doubt that they could handle E85 with the blower spinning this fast with the 3.7" pulley. You could ask JRE (your tuner) about these ideas if you want to try one of them. As previously mentioned, these types of measures could help reduce heat, but if there is a mechanical problem, they will not fix it.
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There is enough fuel supply to support 750 RWHP on E-60 in the LT4 fuel system components.
I am not a fan of supplemental fuel supply through the intake track as distribution can be a problem, and has the potential for failure when you least expect it.
Always opt to put the fuel through the injectors in a DI engine and use good fuel it will always be cheaper than an engine.
Ted.