Ustasa

Predator666 It doesn't advance/retard based on a/f ratio but on rpm and load sensing which in this case would be from the AFM. The S-AFC changes the AFM signal the stock ecu sees. What this then does is change the fuel and ignition set for a certain rev and load point. You might be running 12psi but the stock ecu is only "seeing" say 8psi. At 8spi you will run less fuel and more advance then the stock ecu would have ran for 12psi. You know you have damaging detonation when you can feel the vibration through the throttle. It's akin to a misfire like fouled spark plugs but the harshness is more pronounced and you will hear a tinkling similar to a can of spray paint being shaken.

Originally posted by R33NT "I dont know what the SAFC is, i assume it is a piggy back fuel trimmer which in my opinion is dodgey, either do it properly (PowerFC) or dont do it at all." I believe he is spot on. A S-AFC is what is known in the industry as a "sensor bender". It doesn't have the capability to differentiate between different load settings like a Power FC does. A S-AFC will just chop the signal coming from your afm (or map sensor). When you turn up the boost in a stock ecu’d car the air/fuel ratio richens up and your ignition is retarded. When you use an S-AFC, you lean out the fuel by modifying the signal the stock ecu sees but at the same time you change the amount of ignition advance as well. Instead of retarding you can advance the timing which at high boost levels will kill engines quickly especially if you aren’t used to detecting detonation.

Explain 100% accurate?

The shootout mode is there for the sake of obtaining consistent results in different atmospheric conditions and for cars of different drivetrains. If the correct inertial settings for each car are entered then the power reading will not be inflated.

Attached below is the dyno graph for a rb20det fitted with the TSI engine management system. The car had 440cc GTR Injectors and an rb25det afm which was quite a combination to overcome with the standard ecu. As you can see, the TSI did a good job in handling fuel and ignition duties at the 19psi required to make the power on the graph. The tune was very conservative as with all our street tunes and there was more power to be had if we pushed the timing.

I must say that moveit took my vote for best car on the day. Was immaculately presented and it made the power where others were carrying on. A very light ping was detected on the 2nd run but was nothing unusual in the 37 degree heat. When I was loading it up on the dyno before ramping it, it was pumping up to 6psi at only 2220rpm/full throttle in 4th gear. Top stuff compared to some of the monster turbo cars on the day. Bigger turbo chargers will make more power higher up but the stock unit is impossible to beat on response and mid range puff. I like it

Just finished the final tune of a TSI on a R32 gts-t. It made 218rwkw at 19psi with a conservative tune since it is a daily driver. The car has GTR 440cc injectors of different impedance to the original jets yet the TSI has no problems with this since it has it’s own injector drivers. I will post up a graph tomorrow with the final power pull.

A interesting discussion here. I believe both sides of the argument have raised valid points. On the dyno, we have seen 2rismo’s car push out over 190rwkw on 11psi which is around 240kw (320 hp) at the crank. But the trouble is the turbo might go bang tomorrow or in 2 years time. You just don’t know with the ceramic turbines. Rev - no one here discounts your achievements with the set up you got. Probably the best bang for buck skyline in the land. I honestly don’t know how your car achieves the terminal velocity it does on the modifications you have carried out. At first I thought you had a 50hp shot of nitrous lurking somewhere but other then that I wouldn’t believe what you are getting without the time slip. Well done

In regards to changing the cam timing with cam gears, you won’t be able to gain up top without losing something down low. You are in effect just shifting the power band higher.

Joel, If the steady state operating conditions were the same in 1st and 4th gears your engine would be making the same power. Were the same ramp rates and inertia figures dialled in for the power runs in different gears? The ramp rate changes the time your engine is held under load when run on the dyno which can affect the power developed by the engine. Different gearing will never change the power an engine makes but it will change the torque that is fed through the drivetrain. In the end it’s what gets to the ground that is important, as long as the tune is done in the right speed range to suit the dyno and rpm of the car.

I’d be wary of green 200sx’s. I know of 3 that look mild but pack a punch. One even had a avo stage 2 cooler that I couldn’t see in broad daylight (I shit you not) plus a 400hp garrett with the 0.6 a/r housing that you couldn’t pick. Chuck on a nice dual muffler jap exhaust with the stock looking tips plus the fuel system/ecu you couldn’t see and there is your 230rwkw 200sx. Very sneaky customers…

The power output of the engine is the same regardless whether the car is dynoed in 3rd, 4th or even 5th gear. But in lower gears the higher wheel speed and distortion in the tyre/dyno roller interface shows up as a higher power figure at the wheels NOT the engine. Hope that helps.

Joe that’s a pretty comprehensive list. Even so a lot of those prices would be for used parts bought on the cheap. Try getting a decent fuel pump for $200 Clint for $50 all you would get is a re burn of your eprom. Who knows what kind of maps would be up loaded. You’d have to be a houdini to guess what fuel and spark to punch in for a 230rwkw car without doing any power runs or checking the a/f ratio.

Guys, The place is just off the Great Western Highway. Turn off the highway when you see a Kennards Hire place (across the road from Fox Hill golf course). Go down Toongabie road and take the first right into Amax Avenue. Go up the road till you see a set of Business units next to the Baida Chicken Factory. Go right to the back of the Units and you will see some cars. We are Unit 17. See you all there

The dyno has taken many a fwd before. Happy to do so again

Be there or be square! lol

Guys, We organising a dyno day to help us kickstart our new business. The day will include 3 power runs, a power graph and plenty of free advice about future mods. The details are Price: $45 ($40 if more then 20 cars attend) Date: Saturday 21st September Time: 2pm Venue: Unigroup Engineering Unit 17 17A Amax Avenue Girraween Phone: 9631 2470 We reckon it will take 15 mins per car so plan on being there for a few hours I'll edit this first post regularly as more people book in. Thank you Attendees: Kabab STUGTR Skyhigh sidewaymambo

Guys, The day is still on. Whether 5 cars or 15 turn up we'll be there from 1pm. So bring your mates and anyone who is interested in watching a skyline turn the rollers. Should be fun!

Stugtr No it's not a 4wd dyno But anyone with a gtr willing to disconnect the front wheel drive is more then welcome to come.

Guys, We organising a dyno day to help us kickstart our new business. The day will include 3 power runs, a power graph and plenty of free advice about future mods. The details are Price: $45 ($40 if more then 20 cars attend) Date: Saturday 21st September Time: 2pm Venue: Unigroup Engineering Unit 17 17A Amax Avenue Girraween Phone: 9631 2470 We reckon it will take 15 mins per car so plan on being there for a few hours I'll edit this first post regularly as more people book in. Thank you Attendees: Kabab STUGTR Skyhigh sidewaymambo

Guys, Anyone who wants a dyno run and some advice on whats going on with their engine/setup feel free to message me. Our prices for non-dyno day sessions will be only slightly more expensive but a more personal level of service will be assured. Also on site is a mechanical engineer (as am i) who has been working in the emissions testing field. He has been involved in various RTA emissions testing programmes and knows the IM-240 emissions test drive cycle (the one used by the RTA for emissions testing). Our facility has a dyno dynamics dynomax 450 dyno, Autronic AF/R as well as a 5-gas analyser. We can handle just about any after market engine management system from microtech to oem tuning. So feel free to ask away

GPS signals aren’t too hard to jam….but then again most car thieves are morons

Guys if you feel like having a friendly and fun dyno day give Unigroup Engineering a try Unit 17 17a Amax Ave Girraween pm me for details if interested

Dyno Chassis Facility Sydney By the middle of next week a new tuning shop will be open in the western suburbs of Sydney. First off there will be only a DD 2wd dyno with additions later on down the track. Feel free to check it out. Unigroup Engineering Unit 17 17a Amax Ave Girraween pm me for details if interested