rob82

No!!! 99.999999% of the time a missfire will be due to a bad plug (wrong heat range, incorect gap, cracked insulator) or a bad coil (cracked coil boots, foreign particles around plugs/boots and or excessive oil or the coil itself). Also overly retard ignition can casue missfires along with about a thousand other things - check the basics first always!!!! Can somebody please do a missfire check list and wirte it into a sticky - I swear we see this post every week.

Sounds like you need a new cam and CAS by the sounds of that as there is to much play within the spline/half moon and the CAS itself. Have seen it before. Customer complains that it sometimes pings and sometimes just feels really sluggish. He had about +/- 7deg timing variance depending upon where the sline allowed the CAS to move to.

Would take a fair amount of tuning to get right. But if you wanted to get tricky you may be able to measure the differnce between front and rear wheel speed sensors and make that an axis. That way you would have: 1. Map1 Wastegate duty cycle with MAP and RPM as the axis. 2. MAP2 wstegate duty cycle with (difference in wheel speed) and RPM as the axis. THat way you pull the boost out when there is a larger difference in front to rear wheel speeds. We are actually the agents for racelogic traction control systems they work on wheel speed differntials and you can dial in the percentage slip allowed - very cool stuff, very expensive as well - as its used in formula 1.

Map 1 is wastegate solenoid duty cycle map with MAP and RPM being the axis Map 2 is wastegate solenoid duty cycle map iwth TPS and RPM being the axis Lookup Table 1 is wastegate solenoid duty cycle map with VSS being the axis MAP 1 - MAP 2 - Table 1 = final wastgate duty cycle.

Nest another table - that pulls the desired boost out w.r.t low values of VSS.

True but we only want to run around 6psi - it just gave us an indication of where we are going. The customer originally had a small gate before changing to this one.

MOTEC and AUTRONIC both have TPS based boost control. We use our xede to do TPS based and semi closed loop boost control on XR6T(as they need it). THe way it works is by nesting two 3d maps. ie 1 Map is a wastegate solenoid map with MAP and RPM being the axis. The other map being a straight multiplier table of the first map with TPS and RPM being the axis. So when you dont want boost you dial it out of the with the multipier table. The problem with alot of EVC is that once they see a set amount of throttle on board say 20percent, they then aim for the desired boost.

No I was just testing wether a 50mm gate was large enough when fully opened to control that sized turbo all the way to the rev limit - and it was as it only ran about 1 psi of boost at the rev limiter. I was suprised though as it made 320rwkw about 120rwkw more than a standard car. What boost controller are you using?

I wasn't being sarcastic.

I tuned a GENIII the other day that had a T04Z on it made 320rwkw on about 1 pound of boost. I ran the car with no spring in the actuator to determine if the 50mm external gate was large enough, it was. Was really impressed to see that figure. Also in regards to your traction problem - have you tryed TPS based boost control?

I'm using our xede to drive a PWM output to an aquamist control solenoid. The xede will have one MAP Bank that will be used for a lean cruise function where it changes the volatges on both 02 sensors so it trims fuel around say 15.5:1. The PWM output will be mapped in 3d with one variable being RPM the other an EGT feedback. The other switched map will be for big boost where the water injection is just mapped with boost(or AFM) and rpm. I will aslo have TPS based and MAP based boost control on this MAP Bank.

Did you retune the light load, idle and cruise conditions? By going from 38 to 50psi you've introduced about 15% more fuel every where. The 02 sensor will pull some of the fuel out of it but that is too much of a pressure increase.

Shit me, I find the 3540's laggy on xr6T with all the mods and remember they have indepandant cam timing (on the BF's). Thats not including the nizpro intake manifold casue its awesome for response. Its going to be laggy as hell on a 25. I would think 12psi by 5000rpm at the earliest.

Plenums. Man I bet that leaves a shitload of oil on the road. The faster the Porche the bigger the puddle!!!!!

Go hard alright - we've got the mazda 3 pilot car(press car) from Mazda Australia. They've given it to us for 2 months to see what we can do with it. In standard trim it made 160.8 Front wheel kilowatts on about 12psi of boost. We are hoping to make another 30kw on top of that with another 4-6psi of boost. The Mazda 6 MPS (4WD) he had made about 155awkw and went to 190awkw on about 19psi of boost after we tuned it. Both have the same engine. Personally the Mazda3 MPS has made me consider selling my skyline as they are just such a good little car and handle so well. It will be interesting to see if DSC will handle the extra 30kw being a front wheel drive.

Airlfow meters is what makes the PFC so powerful. D-Jetro I assume was made for the american market as they had no idea how to tune a MAF based system. If you want to go MAFLESS get an Autronic because the time/cost taken to wiring in and tune will probably about the same to plugin and tune a D-jetro and at the end of the day the autronic is better.

Thats right ethanol is less dense therefore it will effect economy as you need to burn more to get you the same distance. Ethanol aslo has a lower specific energy rating than normal unleaded fuel so once again for the same mass of fuel you also need more. That being said its ability to supress detonation as it has been said is very good, which may make it a good fuel for performance but not so much for economy as MBT can be found in most cars in cruise with normal 91Octane fuel.

What a/r is the exhaust housing of those turbo's.

Shit I would be more worried about the CATCO Cat then the manifolds. The standard items are a nice piece of work IMO.

I can garuntee you that he is not the only person to make changes on the fly. Hasn't he only just worked out how to chip/emulate the s15? And no the standard ECU is not flashable it's just an EPROM to flash you need EEPROM.

Pre VZ and late VY was the end of lean cruise due to EPA wanting to reduce NOx levels (NOx emmssions go up when there is a lean burn condition) which when combined with photochemical smog causes ozone depleting gases. THis is where they got there good economy from as under crusie conditions the engine was barely running. A typical early model VY GENIII would command an AFR in lean cruise of about 17-18:1. This is how they got there good highway figures. That said I have no idea how they get those highway figures now. Holden is probably just lying and or enable the test car with lean cruise. Have seen them do dodgier stuff to get around emmissions.

A chipped EV09 will beat a stock r32 GTR in a straight line and around a track.

The downside to a remapped ECU is that you have to remap it almost every time you change your car's mods. Other than that its pretty cost effective. I dont understand this comment because if you change your mods no matter what ECU your run your more than likely going to have to retune it. Your always better off getting a custom emulated tune done instead of just a plugin tune.

What ECU are made in korea? I thought only KEFICO (Korean EFI Company) was the only oem ecu made in Korea. Most japanese ecu's are made in Japan aren't they? ie I thought Nippon DENSO were contracted by APEXI to make hte PFC just like standard nissan ECU's.

I dont know the old fashion way of just listening to the motor to detect knock!!