335i in the shop

thats pretty sick!

where is bella motorsports in west palm?

Ernie Bello....hes in west palm yeah

Old Oakachobee and Austrailian Ave.

i think the rims where 17's

hmmm mayb they were 18's i forget

The 335's are really nice. It's one of the cars I'm considering for my daily driver.

That thing needs a more aggressive diff like a hole in the head. It just needs an LSD!

The stock rims flowed better. The BBS looks too small and narrow. E92 needs a fat 5spoke wheel.

sweet, ill have to stop by...maybe they'd be good with installing headers and cams... btw 335i is sooo damn hot.

Originally Posted by 5speedsteve

hmmm mayb they were 18's i forget

Those are 19!!! and they still look small. a 3.46 woo guess it must be new parts too $$$$ as it'll be too early to find used parts on e92.

sweet

Very impressive.

Originally Posted by RichP

That thing needs a more aggressive diff like a hole in the head. It just needs an LSD!

exactly. Turbo'd cars benefit from higher ratio diff, right? No reason to switch to a lower gearing, except if you want to lose boost pressure

Originally Posted by GBX330ci

exactly. Turbo'd cars benefit from higher ratio diff, right? No reason to switch to a lower gearing, except if you want to lose boost pressure

Boost pressure is built in exhaust gases and engine load. Has NOTHING to do with final drive. If anything would be from lower final drive to get more load.

But Boosted car can benefit from a longer first gear to take advantage of the turbo quick spool up and not waste it on tire spin and rev limiter coming so fast.

Originally Posted by rsalicrup

Boost pressure is built in exhaust gases and engine load. Has NOTHING to do with final drive. If anything would be from lower final drive to get more load.

But Boosted car can benefit from a longer first gear to take advantage of the turbo quick spool up and not waste it on tire spin and rev limiter coming so fast.

however, you have to take into consideration this is not a traditional turbo setup. there's a small turbo that spools up boost quickly while another larger turbo kicks in at the higher end. a lot of the know-how with traditional turbo setups don't apply in a straight forward way here...

Thats not how this turbo system works. Its not a sequential set up. Equal sized turbos are attached to 3 cylinders each and provide their own boost to each side. BMW preferred to use smaller turbos with quicker spool on each "bank" to ensure low end torque. Regardless of how the turbos are set up final drive still means nothing in the power category.

Originally Posted by tpzblu330ci

Thats not how this turbo system works. Its not a sequential set up. Equal sized turbos are attached to 3 cylinders each and provide their own boost to each side. BMW preferred to use smaller turbos with quicker spool on each "bank" to ensure low end torque. Regardless of how the turbos are set up final drive still means nothing in the power category.

You're right about the twin turbo setup. I was thinking of BMW's twin turbo diesel engine that has a sequencial turbo setup.

However, gearing does influence the drivability of a turbo engine car. Just as an example, off line in 1st gear, the car with the higher multiplying gear ratio is going to reach a lower RPM than the same car with a lower multiplying gear ratio at the same speed. Hence, as an example, at say 40mph, one car will be at 3000 RPM vs the other car will be at 4500 RPM. If your boost doesn't kick in until 4000RPM, then having the gear ratio that gets you in that RPM range quicker will make getting into the "boosted zone" easier. Typically, the car that gets into the boost zone quicker will be faster. At higher speeds, this becomes less significant as you can choose to use a lower gear to keep your revs up, and hence in boost. At lower speeds, you only have a few choices in gears and you can't go lower than 1st.

In any case, if this engine uses smaller turbos that kick in at lower RPM ranges, then a lot of this matter less.

Originally Posted by BMWPower06

better low end power+more torque and around the same weight its a close race with top end going to the 335i

top end goes to the m3, idont know what your talking about

Originally Posted by bimmerZ5

You're right about the twin turbo setup. I was thinking of BMW's twin turbo diesel engine that has a sequencial turbo setup.

However, gearing does influence the drivability of a turbo engine car. Just as an example, off line in 1st gear, the car with the higher multiplying gear ratio is going to reach a lower RPM than the same car with a lower multiplying gear ratio at the same speed. Hence, as an example, at say 40mph, one car will be at 3000 RPM vs the other car will be at 4500 RPM. If your boost doesn't kick in until 4000RPM, then having the gear ratio that gets you in that RPM range quicker will make getting into the "boosted zone" easier. Typically, the car that gets into the boost zone quicker will be faster. At higher speeds, this becomes less significant as you can choose to use a lower gear to keep your revs up, and hence in boost. At lower speeds, you only have a few choices in gears and you can't go lower than 1st.

In any case, if this engine uses smaller turbos that kick in at lower RPM ranges, then a lot of this matter less.

Oh indeed gearing changes drive ability but not actual power output of the engine. We reach agreement on that. As you said at the end BMW has elimated both of the cons of FI engines by going with this setup. Gearing can be kept the same as their NA engines because torque is available throughout the range and boost lag is non existant as well.