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The consensus is starting to vary. Tolerances are different from car to car. All being equal, one may take 700 to the wheels, while another may blow at 600. Tuning, fuel quality, and supply are key as well. So "safe" is in the eye of the beholder
Also, how much longevity is expected is an important question to ask. If you want a 100K plus life motor, or 30K. Each situation and scenario varies from the other.
Most would say that 6 to 7 PSI with GOOD quality 93 octane fuel, a tune that is spot on, is safe for the most part.
Last edited by Translator; 02-13-2018 at 09:14 PM.
The consensus is starting to vary. Tolerances are different from car to car. All being equal, one may take 700 to the wheels, while another may blow at 600. Tuning, fuel quality, and supply are key as well. So "safe" is in the eye of the beholder
Also, how much longevity is expected is an important question to ask. If you want a 100K plus life motor, or 30K. Each situation and scenario varies from the other.
Most would say that 6 to 7 PSI with GOOD quality 93 octane fuel, a tune that is spot on, is safe for the most part.
I would be happy with the ps1c at 6-8 lb boost with meth and 93 octane and 575-600 whp
but i dont wanna blow the thing apart. my tuner is real real good so i trust him on the tune.
idk a mileage number i put maybe 4k on a season ? i would like to drive it more.
What kills me is that since 2003 people have been using 5.3L truck variants at these power levels reliably for 15 years.
I think part of 'missing' factor is the blower power consumption, which is generally 15-20% of output. So 500rwhp is actually making closer to 600rwhp, but the blower is eating that chunk even though the engine still feels it in the bhp number and internal axial stress to the piston/etc.
I wouldn't think you would need Meth to reach a 575hp level. Unless you just wanted it for safety. 8lbs boost on 93 plus meth would most likely net you around 650+whp. I was told by a VERY reputable shop (site sponsor) that 650 is pretty safe so long as you're not banging on the car with constant WOT runs. They also stated 600 seems to be about the limitations of the stock wheel/tire set up. I'm just gonna go with an ECS kit and headers and shoot for a 575-600whp with no meth. I was considering meth as a safety precaution but after talking to said shop, if I'm just keeping the car for mostly street use, I decided to stay away from the meth as it is just another fluid to keep up with constantly (esp since there aren't many good solutions for a meth tank on our cars). He stated that they've done hundreds of rides with just a blower, headers, and tune with very little to no known failures to date and that combination seems to yield quite a fun little product!
I wouldn't think you would need Meth to reach a 575hp level. Unless you just wanted it for safety. 8lbs boost on 93 plus meth would most likely net you around 650+whp. I was told by a VERY reputable shop (site sponsor) that 650 is pretty safe so long as you're not banging on the car with constant WOT runs. They also stated 600 seems to be about the limitations of the stock wheel/tire set up. I'm just gonna go with an ECS kit and headers and shoot for a 575-600whp with no meth. I was considering meth as a safety precaution but after talking to said shop, if I'm just keeping the car for mostly street use, I decided to stay away from the meth as it is just another fluid to keep up with constantly (esp since there aren't many good solutions for a meth tank on our cars). He stated that they've done hundreds of rides with just a blower, headers, and tune with very little to no known failures to date and that combination seems to yield quite a fun little product!
If there is no methanol/water and I am trying to get a high dyno number to prove something can be done without water/meth, I can pre-heat the oil to 220*F then start the cold engine. Give it maybe 5minutes then blast it on the dyno at some inane boost. Even if I was tipping the border of detonation, or flaking bit of my piston, I could achieve some number on some dyno and say "look it is possible".
The real "what is possible" is depending on how the car is setup. for example, How much air volume in the intake tract between filter and throttle body, efficiency of the intercooler/compressor, Joules/second of engine output (power in terms of torque per unit time as any unit). As Joules/second is going up, you will expect more heat to transfer from the exhaust system or for the temperature of exhaust to start going up also. Where does it stop? what is the peak EGT? A list of questions, answers, and counter control measures will come into play to determine whether the race car is able to complete the course without incident, for these are all application specific. A number coming from a machine really has no bearing on the performance of the vehicle whatsoever beyond whatever the machine is calibrated to think in terms of torque per unit time, and it reported that to a human who also may or may not have any clue what that number means.
I was told by a VERY reputable shop (site sponsor) that 650 is pretty safe so long as you're not banging on the car with constant WOT runs.
That kind of destroys the point of adding power. Why add a mod that restricts use of the throttle? Seems counter productive. In my mind, if it can’t survive repeat WOT runs, it’s to much power.
That kind of destroys the point of adding power. Why add a mod that restricts use of the throttle? Seems counter productive. In my mind, if it can’t survive repeat WOT runs, it’s to much power.
Multiple consecutive WOT runs generate too much heat IMHO for a non-forged stock short block, especially on hot summer days. The PCM will be pulling a ton of timing as well due to high IAT's (as it should, if tuned right, under these circumstances). Meth does help to cool the intake charge down though, and reduce IAT's.
Last edited by Translator; 02-14-2018 at 02:47 PM.
Multiple consecutive WOT runs generate too much heat IMHO for a non-forged stock short block, especially on hot summer days. The PCM will be pulling a ton of timing as well due to high IAT's (as it should, if tuned right, under these circumstances). Meth does help to cool the intake charge down though, and reduce IAT's.
how do you define that.... like red line every gear up to 150 mph or redline 2 gears to 90-100 and let off ?
how do you define that.... like red line every gear up to 150 mph or redline 2 gears to 90-100 and let off ?
Yes, like shifting through multiple gears until redline for prolonged periods of time over and over again - like people do when roll racing on the highway.
what if you upgrade the whole fuel system instead of meth. so you get lt4 injectors, HPFP and lt4 z06 fuel pump module??? I feel like the two issues here are pcv issues (lack of a good catch can) and leaning the motor out too much (lack of fuel)
I'm looking as well, same scenario. Talking to some of the vendors, the general consensus is @600RWHP on the LT1 on a 91 tune (but many say the motor can easily support @700RWHP, but degraded longevity on stock pistons, rods, heads).
I'm looking as well, same scenario. Talking to some of the vendors, the general consensus is @600RWHP on the LT1 on a 91 tune (but many say the motor can easily support @700RWHP, but degraded longevity on stock pistons, rods, heads).
I spent a lot of time thinking about the fuel upgrade idea and then one of the forum vendors actually mentioned it to me. Not sure if its one of their build secrets or not so I am not gonna say who it was until they comment themselves. but it seems like meth is just adding extra fueling so to speak so if you could upgrade the stock fuel system to provide constant extra fueling that could eleviate the need for meth and also keep the car from leaning out. I know meth also has a cooling effect on the engine keeping internal temps down. but im not talking crazy power here 600ish WHP
Its water. Water is what holds down the EGT in a significant fashion. 100% distilled water injection is viable and can hold down temperature of components, reducing expansion of metal materials, improving the behavior of poor fuel.
I have 610 RWHP using meth in my windshield wiper tank. Car runs great since the install 1 year ago by A&A corvette. Let the car enjoy the meth experience, just don't use meth on yourself. very destructive to the body.
02-13-2018, 09:05 PM
What's a safe RWHP number on a LT1 with stock pistons/rods
