what about an engine speed and boost control if you are concerned with controlling dependent on airflow
wasn’t voltron working on a meth system right around the time he got sick of untested aftermarket parts and bought a 556hp stock sedan from the general?
Snow system maybe?
Oh seriously? I thought it was just the 11.5 runner. Paging Voltron…!
Usually people use the windshield washer tank b/c then if you get low you get a warning on the dash, but it’s not “out”.
Also, the more integrated & safe systems have a flow meter in them so that if flow is low, not as much, air bubble, anything etc, it is known immediately. That is where having a tune specific for it is really good (like a race gas tune vs 93 tune).
The 335’s guys do a ton with meth and the results are really impressive, but on a turbo system it will respond a little better than s/c typically. But they just have different tune maps that they can switch between, and if the flow cuts out or changes for a second then the map kicks down to protect everything.
Yes agree with the above.
Assuming the tune is simply supplementing a proper map for the fuel, no problem, a failsafe isn’t really required. Because we B8 S4s can’t switch tunes on the fly, and we don’t have any specific tune for meth, we are severely disadvantaged here in terms of not having a failsafe when using it for extra performance than what the fuel can provide. Sure, knock ignition retard will help if the meth delivery fails, i guess it can pull back 5-6 degrees if it has to, which is likely the difference between our 93 tune and our 100 tune (I can speak for APR tunes only). But a knock event will have to happen first to register knock, ugh.
Yeah boost controlled meth delivery is definitely better suited to a centrifugal blower or turbo. In this case, our positive displacement blower on stage II generates full boost as low as 3300 rpm, and thus full meth would come online by then, when the airflow is actually less than half of the peak airflow. a 3d map would be awesome to include rpm, or better yet, mass airflow, but that would require the signal from the ECU that we don’t have, or a piggyback like the JB4 the 335 guys use. Anyway we’re compromised on the B8 S4 in this regard, but using a rough control of meth via boost might still be better than nothing.
And to think we were mocking the MTM piggyback, lol.
If the REVO 93 tune really IS using almost APR 100-tune levels of ignition timing, and hasn’t broken a motor yet, it could be possible then to use the (relatively) milder 100 octane APR tuning with methanol on 93 (in fact, 94 up here in Canada). Lol, not sure who will be first to test it out.
yeah I don’t know. The thing that is awesome about the B8 S4 is that it is really quick with stock motor + tune + pulley…but it’s still a pretty safe and simple modification package. Throwing race gas at it, or meth…I just think it starts to lose its appeal (and will lose either its safe and/or simple attributes). ‘oh shit I’m almost out of meth’. That sucks. I did pulls with a B5 on frankenturbos and he ran out of meth half way through so we had to stop. Just seemed useless to me frankly. He would have had to switch to a straight pump gas file and would have been far less impressive.
Give me a car that is fast on pump gas…and is pretty simple and reliable. Otherwise give me a different car. I don’t have the time for headaches. If I wanted headaches and big power I’d get a big turbo B5 or something.
I have a friend that runs meth on his non-intercooled Vortech 383 LT1, he switches tunes for the track and runs it out of his windshield washer. His Trans Am is a 6 spd and runs deep 10.2’s. It’s pretty much a track only thing and he detunes it for street use which he figures costs him a good 80-100 HP
I figure if you want a track time, run a fogger for the track on a 100 tune, that would make some pretty fierce power and probably run deep into the 11’s. If I could find a custom tuner that would create a personal tune I would be far more interested in some more serious mods. I wish I could tune this car around what I wanted as opposed to spend way too much cash and have to buy the tuner parts.
I feel the same about the tuner wars, I’m going to wait till the hype subsides and decide when I see a larger sample of results. In this car I’d be happy with a tuned M3 killer and leave it at that. If I wanted really fast at the drag strip I’d simply go back to Ford, GM or Dodge, big power for cheap. Our engines are simply to small to go toe to toe with big displacement but I bought this car because it does so much else very well.
I don’t really think you’re running a B8 S4 deep into the 11s on a meth tune vs. a race gas tune that is low 12s. That doesn’t really make sense, does it? Primetime has a pretty huge modlist, runs exclusively race gas, runs an APR beta tune, and has run 11.79 I believe. I don’t see the advantage of meth there really. Another car ran 11.97 or something with a 25mph tailwind. That same car ran 12.0something with that same tailwind as the fastest pump gas time was. Tough to say how reliable that piece of data is. The next fastest pump gas time was something like 12.27 I believe. Throw meth into the mix and I think you’re looking at low 12s still.
As for your plans for the car, that’s what I was referring to above. You can get a tune, pulley and maybe a decat and be well into the 12s. Pretty awesome. That’s typical of a stage III K04 B5 S4 on pump gas…often considered a benchmark ‘fast’ car.
Sorry if you misunderstood, I wasn’t suggesting meth would make that kind of gain I was talking about a nitrous fogger kit which would be pretty easy to set up. I dont think meth would make that much of a difference ;D