It would probably effect your warrenty if you ever broke anything. I've heard they can tell if the PCM was tampered with. (I. E. a tune)

 

I believe the vishnu procede tuner works as a piggyback to the computer system, intercepting the computer codes and replacing them with it's own, thus never really changing the stock calibration physically like with a flash tuner. So you really aren't changing the original tune. When going to the dealership all you have to do is turn it off or take it out and it will be like stock again and they should never know.

 

2 things hold the 335 back.

There isn't a bigger direct injection injector with the same spray pattern, so fuel is maxed out, meaning boost is as well (not that I think it can take much more than 13 based on the cast pistons).

The bottom end is STRONG, but the block is unsleeved aluminum and the pistons are cast (and fairly weak). The rods and crank are forged and good for more boost, but I wouldn't want to add much more than already is there on the stock pistons.

I think the E46 M3 makes a better boost candidate. Forged block, higher revving (so you can make more horsepower without cooking the pistons) and the chassis is MUCH better to begin with.

 

Don't the 335's have serious overheating problems or did bmw fix that?

 

I haven't heard of that but I doknow BMW made the same stupid mistake it made with its 7 series cars. Put the air intakejust behind the lower front bumper. Meaning, if you go through a puddle more than 5-6" deep you risk sucking in water.

One of my customersowns a 335i. Had it for 4 months and did just that. Hydrolocked the motor.It's not covered under warranty and took 3 months to fix. Whole motor and turbo system.

 

Im really looking forward to the new 135i.. same motor setup as the 335i but starting price in the low 30's.. and its a smaller and lighter car.
We keep talking about it.. if things go right finance wise this year, when its released in spring we may get a six speed version of it.

 

I don't think it was an overheating problem. The 335i is made to runaround 240-250 degrees. The older 335i's temp guage in the dash was set too low and a lot of people were bringing in there cars because they thoughtit was over heating.The needle was just ending up in a position past the middle of the gauge when under normal driving conditions, creating the scare. The newer ones were made with a gauge that had a higher range in temperature so that the needle will end up in the middle under normal operating conditions.

 

the auto tranny's did during extreme driving. i think there was a recall but not sure.

 

i dont see where you are going with this. Cast pistons doesn't necessarily mean weak. Keep in mind the usdm wrx sti's have always used cast pistons and with lower displacement they have been taken to over 500whp on the stock long block. The fuel issue can be solved in alot of ways. The fuel system may not be maxed out the way it sits. Direct injection systems run extremely high pressure, but the pressure can actually be increased without replacing the injectors themselves. Im not exactly quite sure how it works but a few people i know with mazdaspeeds have done it. I'll look into an explanation on that. I wouldn't be so sure that this thing is maxed out. Vishnu knows what they are doing when it comes to turbo vehicles....we will just have to wait and see what they can do with it.

 

Mostly making the statements because I've known a couple people who have had engine issues boyond 10 pounds of boost on an M54, the N54 in the 335 shared the same bottom end with a DI head allowing for an extra (say 3-4) pounds of boost before problems start to occur. There are people running more, but they face one of three issues - head lifting off - blown head gasket (repeatedely) - cracked pistons.

The cracked pistons being the most significant of those as it *can* destroy the block since its aluminum.