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Message: <blockquote data-quote="Syahz" data-source="post: 4065184" data-attributes="member: 79383">Some good info from Haltech Tuner Forum:To begin let me say that using a load bearing dyno is superior in almost every way to road tuning. You can work out a better tune in a shorter amount of time in a much, much safer environment on the dyno than you can on the street. There is still a place for calibrating on the street but it should come after you've done your dyno work and want to make certain there are no driveability issues or abnormalities that didn't show up on the dyno. It's also so much more accurate to setup timing on the dyno than on the street. Spend the money on dyno time. It's worth it.Having said that, the easiest way to tune on the street is to start with the lowest rpm range you can maintain a steady cruise speed at and work your way up. Say 1500 rpm. If you have working cruise control that makes this so much easier. Just pick the speed, set the cruise and drive. You'll need to chase the load indicator and wideband readout around and be quick with your fingers to make adjustments. If you live in an area that is very flat you will need to use the brakes to increase load. The hand brake seems to be more easily controlled. You can very quickly roast a set of pads so be cautious and work in short intervals letting the brakes cool between. Having a long steady grade hill to work with is a big plus here. Once you have one rpm range scratched out move to the next and repeat.For low load tuning you want to use at least 3rd gear to keep the car steady. Gear is usually dictated by the speed you need to maintain to not be a complete nuisance to traffic. As you climb through the rev sites you will want to gear down to keep your speed down. 4500 rpm in top gear may be too fast for your local speed limits. Ultimately gear isn't too important for this stage of tuning.I usually work up to about 5000 rpm like. Assuming that is near your torque peak you can safely make an educated guess as to what the fuel requirements will be for the low load sites from there to the end of the rev range. It's safe to assume you want be cruising at low load at 7000 rpm anyway. Unless you're circuit racing these sites are very rarely used.You should now have a good commuter car that drives down the road as well as your daily drie Camry. If it bucks and pops you have work left to do. I usually do the above in stages. Make one pass through to get the car driving well but not too worried about ultimate a/f ratio and economy v. power. Once it's driving smoothly I'll go back through and begin setting very low load and cruise load sites to near stoich. As the load comes up I'll richen the mixture toward what I assume will be best power. Near 0 in/hg MAP you'll want to be at the mixture you assume will make best power, say 12.5:1, and taper that down to 14.7:1 where the car likes to cruise and below.With that done you move to full load tuning. You'll need to make power sweeps from low to high rpm. Start with a mixture you assume will be fat and work toward a leaner mixture. It's OK to flood the engine with fuel under boost when you first start out. With an NA car you should have most of this worked out already in the first step and now you'd only be working on the high rev sites. With a boosted car you have lots of work left to do. I'll start my runs below the point the turbo starts providing positive pressure. If you can hit full boost at 4500 I'd start at 3000 and mat the accelerator. You'll want to be datalogging this and you will need the wideband integrated into the data stream. That's really required. Watch the wideband readout as the revs come up. Lift immediately if you begin to lean out. If the tune is too fat and the engine begins to misfire lift. At this point I'm usually not worried about the datalogs I'm just roughing it in and getting it to make a clean pull to red line without being lean. Say you're shooting for 11.5:1 under boost I'd be trying to get it in the 11 - 11.5 range here and making sure it pulls cleanly to red line. Once you have that then you can begin datalogging and using the information there to narrow down the tune and get a consistent reading from boost threshold to red line.A partner makes this go by so much more smoothly, quickly, and safely. I can't stress the last one enough. I tune alone on the road but it's dangerous and I hate doing it. Go to a dyno... There's really no secrets to working alone. Cruise control helps a ton! It's one less gauge you have to watch. Monitoring speed, rpm, a/f ratio, engine temps, boost, and maybe the road and innocent drivers is hard enough for two people but doing it by yourself and trying to make key stroke adjustments is dangerous. Only word of advice for doing it yourself is to find a way to securely mount your laptop so you can see it and work the keyboard without it moving around on you. Take breaks, review the data, take time to think over anything that might be confusing you before moving on to the next step.Notice I didn't mention ignition timing. The proper way to work out timing requires a dyno IMO. You can tune to the knock threshold on the road if you have a proper know detection system but it's still not as accurate as using the dyno. Regardless of dyno of road work start with timing figures known to be conservative, work out the fuel, then move to the timing. On the dyno you can advance timing until the power doesn't rise anymore or you find the knock threshold. If power quits rising before the knock threshold there is no need to add more timing and you are probably costing yourself power at that point with further advance. On the street you can't see the reaction between power and timing and can only (hopefully) know if you've reached the knock limit.To answer your direct questions directly.1)How many runs? As many as it takes.2)How long should each run be? Lift if you're lean or it rich misfires. Otherwise boost threshold to red line.3)What gear(s) should be used? 3-top gear. Boost pulls should be 3rd or 4th. 3rd will allow full revs without a hugely excessive speed. 4th gear allows for a pull that is longer is duration and maybe some better data. 3rd gear may not provide full boost so that may be an issue.4)Which rpm/load points should be targeted? All of them. Work out the cruise sites first, then the full load sites. If your boost limit is 15 psi you won't be able to hold 7 psi through the rev range so you will need to interpolate between 0 in/hg and 15 psi for all rev ranges.Good luck.</blockquote>

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