golfyjammer
21-08-08, 07:07 PM
What makes the 1.8t Unique.
5 Valve technology .
The 1.8t does not have 5V total nor does it have 20V per cylinder. It has 5V per cylinder giving it a grand total of 20V (5V X 4cylinders)
Three valves are for intake
Two valves are for exhaust.
The AEB head has the largest valves.
What is VCT?
VCT or Variable Cam Timing. Synonymous with Variable Valve Timing
The AWW, AWP, and AWV engine codes have VVT, while the AWD and APH do not.
The VCT in later 1.8T's is simply for emissions purposes. It has only two states - normal and massive overlap. The overlap is used to draw exhaust gasses back into the cylinders at startup.
What is Surging?
Compressor surge is where the air backs up in the compressor and oscillates violently within the compressor wheel. This happens when the engine's swallowing capacity is exceded by the compressor's output.
The technical definition is when the pressure after the compressor exceeds the radial velocity component of the compressor wheel's output which causes the air to back up.
The sensation is somewhat akin to getting on the pedal and simultaneously then getting off it, many times, the car feels like its bucking, acceleration, deceleration, acceleration, etc.
What are coil packs?
The 1.8t motor has a slightly different ignition system than most of us are used to, replacing the more traditional distributor and ignition wires are coilpacks. Coilpacks sit directly ontop of your sparkplugs and are located directly underneath your engine cover. You need to remove your coilpacks in order to change your sparkplugs. Coilpacks work in much the same way as a traditional ignition system in that they power up the sparkplug to create a spark and transfer potential energy in the head into kinetic energy through combustion. In general many people have had certain problems with their coilpacks, chalk it down to improper sparkplug gapping, faulty modules or a host of other conditions. There was a running change in late 2000 where the coilpacks were redesigned and the manufacturer changed. The original coilpacks were produced by Hitachi and used allen keys and clips to hold them in place. As far as I know, very few of these failed.
MAF - Mass air flow sensor
DV - Diverter Valve
BOV - Blow off valve
TIP - Turbo inlet pipe
TB - Throttle body/Turbo-back exhaust
CAI - Cold air intake
IC - Intercooler
Nitrous 101
Wet Nitrous Kit : This means the nitrous jet also injects fuel at the same time. Any time you're spraying nitrous, you're spraying fuel too.
Dry Nitrous Kit : This method usually makes use of a special box to override the injectors or simply to bump up the fuel pressure, causing your stock fuel injectors to inject more fuel. All the nitrous jet injects in nitrous. It relies on the stock injectors for fuel as well as an override method to make them pump out more fuel.
Direct Port Kit : This can, in theory, be wet or dry. All it means is that you have individual nitrous jets on each intake manifold runner instead of a single jet some where in the intake pipe. 99% of direct port kits are wet, since the whole point of getting a direct port kit is to make sure you're correctly injecting equal, properly regulated amounts of fuel and nitrous in to each cylinder.
Don't ever run a dry nitrous kit. On the 1.8T, the stock injectors are pretty much maxed out just to supply all the fuel needed for full boost once you're chipped. Trying to squeeze anything more out of them is just begging for injector failure. No one wants to run 6 bar across their fuel rail just to try to make a dry nitrous kit work, and forget about some simple "black box" to take over the electronic control of the injectors. The last thing you should do on a 1.8T is try to outsmart the ECU.
So the real question becomes if you should get a single fogger wet nitrous kit, or direct port, and if you get a single fogger, where to put it. In general, you shouldn't run more than 33% of your off-bottle power with a single fogger, and not more than 50% of your off-bottle power with a direct port setup. With a single fogger, you tend to get unequal distribution of the nitrous/fuel mixture and making more power in some cylinders than others. This isn't good for your motor.
Most people here are running their foggers around 6 inches from the throttlebody.
So basically for a car that makes around 200hp or so when not on the bottle, a 60 or 70-shot would be pretty much the limit for safe use of a single fogger, and a 100-shot should be reasonably safe with direct port, assuming you aren't reaching a cylinder pressure limit at that point. I have no idea if anyone on this board has an ignition timing controller to retard timing while spraying, but the more nitrous you run, the more important that becomes.
5 Valve technology .
The 1.8t does not have 5V total nor does it have 20V per cylinder. It has 5V per cylinder giving it a grand total of 20V (5V X 4cylinders)
Three valves are for intake
Two valves are for exhaust.
The AEB head has the largest valves.
What is VCT?
VCT or Variable Cam Timing. Synonymous with Variable Valve Timing
The AWW, AWP, and AWV engine codes have VVT, while the AWD and APH do not.
The VCT in later 1.8T's is simply for emissions purposes. It has only two states - normal and massive overlap. The overlap is used to draw exhaust gasses back into the cylinders at startup.
What is Surging?
Compressor surge is where the air backs up in the compressor and oscillates violently within the compressor wheel. This happens when the engine's swallowing capacity is exceded by the compressor's output.
The technical definition is when the pressure after the compressor exceeds the radial velocity component of the compressor wheel's output which causes the air to back up.
The sensation is somewhat akin to getting on the pedal and simultaneously then getting off it, many times, the car feels like its bucking, acceleration, deceleration, acceleration, etc.
What are coil packs?
The 1.8t motor has a slightly different ignition system than most of us are used to, replacing the more traditional distributor and ignition wires are coilpacks. Coilpacks sit directly ontop of your sparkplugs and are located directly underneath your engine cover. You need to remove your coilpacks in order to change your sparkplugs. Coilpacks work in much the same way as a traditional ignition system in that they power up the sparkplug to create a spark and transfer potential energy in the head into kinetic energy through combustion. In general many people have had certain problems with their coilpacks, chalk it down to improper sparkplug gapping, faulty modules or a host of other conditions. There was a running change in late 2000 where the coilpacks were redesigned and the manufacturer changed. The original coilpacks were produced by Hitachi and used allen keys and clips to hold them in place. As far as I know, very few of these failed.
MAF - Mass air flow sensor
DV - Diverter Valve
BOV - Blow off valve
TIP - Turbo inlet pipe
TB - Throttle body/Turbo-back exhaust
CAI - Cold air intake
IC - Intercooler
Nitrous 101
Wet Nitrous Kit : This means the nitrous jet also injects fuel at the same time. Any time you're spraying nitrous, you're spraying fuel too.
Dry Nitrous Kit : This method usually makes use of a special box to override the injectors or simply to bump up the fuel pressure, causing your stock fuel injectors to inject more fuel. All the nitrous jet injects in nitrous. It relies on the stock injectors for fuel as well as an override method to make them pump out more fuel.
Direct Port Kit : This can, in theory, be wet or dry. All it means is that you have individual nitrous jets on each intake manifold runner instead of a single jet some where in the intake pipe. 99% of direct port kits are wet, since the whole point of getting a direct port kit is to make sure you're correctly injecting equal, properly regulated amounts of fuel and nitrous in to each cylinder.
Don't ever run a dry nitrous kit. On the 1.8T, the stock injectors are pretty much maxed out just to supply all the fuel needed for full boost once you're chipped. Trying to squeeze anything more out of them is just begging for injector failure. No one wants to run 6 bar across their fuel rail just to try to make a dry nitrous kit work, and forget about some simple "black box" to take over the electronic control of the injectors. The last thing you should do on a 1.8T is try to outsmart the ECU.
So the real question becomes if you should get a single fogger wet nitrous kit, or direct port, and if you get a single fogger, where to put it. In general, you shouldn't run more than 33% of your off-bottle power with a single fogger, and not more than 50% of your off-bottle power with a direct port setup. With a single fogger, you tend to get unequal distribution of the nitrous/fuel mixture and making more power in some cylinders than others. This isn't good for your motor.
Most people here are running their foggers around 6 inches from the throttlebody.
So basically for a car that makes around 200hp or so when not on the bottle, a 60 or 70-shot would be pretty much the limit for safe use of a single fogger, and a 100-shot should be reasonably safe with direct port, assuming you aren't reaching a cylinder pressure limit at that point. I have no idea if anyone on this board has an ignition timing controller to retard timing while spraying, but the more nitrous you run, the more important that becomes.