[nikegunit]

Originally Posted by Russellnyc

Drive in 3rd gear around 20-25 mph. Floor it. The car responds with a little naturally aspirated thrust (i.e. what it would do without the turbos). Wait about 1.25 seconds with the pedal down and you will feel the surge of torque as the turbos spin up. In case you were wondering, that's turbo lag

i think everyone has noticed this

but to bring something else to light, there obviously has to be a split time for the turbo to spool, by gasing, you're forcing a charge of air into the intercool>turbo>engine etc. i sorta "appreciate" (used lightly) the lag, it tells me that i DO have turbo. like someone else posted, without turbo, we'd be in constant "naturally aspirated thurst," which is a lag itself lol. if i floor it and everytime the turbos are in full force, i might as well be driving a V8. dont you get the rush once the surge kicks in??

[RetroGamerJP]

I to enjoy the rush once boost kicks in...

[IMJUSS2NASTY]

Man I think im going to need to get a blow off valve to hear and feel the turbo. Having never driven a turbo vehicle be4, the 335I's turbo are so quiet that I dont even notice it there.

[NaViT]

Originally Posted by IMJUSS2NASTY

Man I think im going to need to get a blow off valve to hear and feel the turbo. Having never driven a turbo vehicle be4, the 335I's turbo are so quiet that I dont even notice it there.

they are little tiny turbos that Mitsubishi did

[BartMack]

Originally Posted by BartMack

I hope you won't mind me asking this question...

I been driving my E92 around town for just 2 days, barely 75 miles actually, and I've experienced a sort of "yo-yo" taking off in first several times.. (manual trans)

I'm thinking I'm just not used to the clutch yet, but have any of you experienced this effect? Thanks...

Originally Posted by lawdude

Several threads on this "bucking" or "lurching". Supposed to be a software fix. Check with your dealer.

Thanks, but those threads seem to be about the AT on a cold start, neither of which applies to me. I've learned it pays to find out what's going on before I talk to my dealer...

I'll keep looking tho.

[lawdude]

Originally Posted by BartMack

Thanks, but those threads seem to be about the AT on a cold start, neither of which applies to me. I've learned it pays to find out what's going on before I talk to my dealer...

I'll keep looking tho.

http://www.bmwtis.com/tsb/bulletins/...p/B124606g.htm

[lkevinl]

Originally Posted by canucklion

you've mistaken turbo lack for turbo lag

I chose the turbo lag option when ordering my car... I left the "turbo lack" checkbox unchecked.

[bmwzimmer]

Originally Posted by lawdude

http://www.bmwtis.com/tsb/bulletins/...p/B124606g.htm

I just took my car in this week to complain about this issue and they told me there's nothing wrong with my car. I'll have to take it in again and bitch this time some more....

[Russellnyc]

By the way, you do hear the turbos if you drive against a wall or in an enclosed parking garage. If you want to hear them, get an intake, that's what opens up the whooshing sound. The blowoff is just a "fffttt" when you let off the accelerator.

Originally Posted by IMJUSS2NASTY

Man I think im going to need to get a blow off valve to hear and feel the turbo. Having never driven a turbo vehicle be4, the 335I's turbo are so quiet that I dont even notice it there.

[topher04r1]

i dont even think anyone makes an intake for the 335i .... yet.....

[BartMack]

Originally Posted by BartMack

Thanks, but those threads seem to be about the AT on a cold start, neither of which applies to me. I've learned it pays to find out what's going on before I talk to my dealer...

I'll keep looking tho.

Originally Posted by lawdude

http://www.bmwtis.com/tsb/bulletins/...p/B124606g.htm

Thanks, I appreciate that. That TSB ended 9/15/06 and mine was produced 1/20/07, but if it continues to occur, I'll at least have something to reference.

[freddiemac]

turbo lag is greatly reduced with Procede, since it enhances low-end/part throttle boost response greatly. I'd say you'll be pretty hard-pressed to feel it. If someone who didn't know that the car is turbo'd, he/she will probably never know it.

[nikegunit]

Originally Posted by freddiemac

turbo lag is greatly reduced with Procede, since it enhances low-end/part throttle boost response greatly. I'd say you'll be pretty hard-pressed to feel it. If someone who didn't know that the car is turbo'd, he/she will probably never know it.

so it feels like a V8?

[lkevinl]

Originally Posted by nikegunit

so it feels like a V8?

I think I remember reading a couple of magazine articles which basically said just that!

[bnj]

What do yo mean by turbo lag?

The feeling of the power increasing along the first 1.5 seconds when hitting gas at low rpm's at 3rd? Or how rapidly turbos are in a certain turbo rpm, flow or boost?

If the first, the power delivery characteristics are based on the engine characteristics as well. I'm pretty sure the spool up doesn't take that much time. But like in na engines, power increases along the engine rpm, with 335i just more because of the turbos.

[13307]

Originally Posted by DocRoss

Also, did you know:

1. Golf balls have dimples;
2. Cheetahs have spots;
3. Plants have cellulose as a function of their cell wall;
4. Purchasing a mattress is pure hell;
5. Yes, there is NO Santa;
6. AND ALL TURBOS HAVE LAG!

I believe posters say "no" in a relative sense. No lag compared to...

What are you talking about! Don't even try to tell me there is NO santa, he brought me my E92 335 this year!....Of course he left the bill for it also so it's a mixed bag. Maybe you just don't have a big enough chimney! Why do these people post this stuff about turbo lag, just to start arguments. Of course it has lag, but far less than any turbo vehicle I have ever driven. PS, Other than the Santa comment, the rest is true!

[andrew20195]

Originally Posted by Dannys 335i

This sounds interesting. I'll quote the source later.

Lag is not to be confused with the boost threshold; however, many publications still make this basic mistake. The boost threshold of a turbo system describes the minimum turbo RPM at which the turbo is physically able to supply the requested boost level. Newer turbocharger and engine developments have caused boost thresholds to steadily decline to where day-to-day use feels perfectly natural. Putting your foot down at 1200 engine RPM and having no boost until 2000 engine RPM is an example of boost threshold and not lag.

Sounds like a paraphrase of Corky Bell from his book Maximum Boost. I highly recommend it to anyone interested in how turbos really work. It's a bit dated, but the fundamentals are there.

So if that is boost threshold, then what is lag? Lag is the time it takes for the turbo to pressurize the intake tract. For example, if you're cruising in 3rd gear at 4k rpm (assuming this is above the boost threshold), and mash the throttle, there might be half a second (maybe less, depends on the vehicle and turbo in question) before you actually feel the surge. That's lag. The actual amount of lag depends on RPM, as higher engine speeds supply more exhaust to the turbine more quickly.

Originally Posted by AW335TT

I test drove the 335i since mine hasnt come yet and yes it does have a little turbo lag but im coming from a Evo IX.. try taking a Evo IX going about 30mph on 4th or even 3rd gear and punch it... now that turbo LAG.. until the revs pass about 3000rpm the car feels like a honda civic until it comes to life and all hell breaks loose

What you described is a perfect example of a car with a 3k RPM boost threshold. The Evos actually have very little lag.

[canuck335i]

yeah crap, I do have a HUGE lag when I floor it at 18mph in 6th gear....

lol

[mayno]

Originally Posted by Russellnyc

No flames please, I am not complaining about this infinitessimal amount of lag, but just for those 335i owners who say it doesn't exist (largely because they haven't ever experienced bad turbo lag and so don't have a point of comparison), I can show it to you. This particular example probably only works in the 6MT.

Drive in 3rd gear around 20-25 mph. Floor it. The car responds with a little naturally aspirated thrust (i.e. what it would do without the turbos). Wait about 1.25 seconds with the pedal down and you will feel the surge of torque as the turbos spin up. In case you were wondering, that's turbo lag. That's the longest lag I could find anywhere in the range, even 5th and 6th spool up faster, probably because there's more load to apply.

3rd gear is especially long in BMWs (it's the driving-around-the-city gear), so the car drags more here than it does in other gears. I think this is clever engineering, since even under hard acceleration, you're beginning to lay off by 3rd gear as you pass 70+ mph after the 2-3 redline shift, and you completely miss this laggy rev range.

Obviously, this degree of lag has no bearing on mid-corner handling dynamics, since no aggressive driver is going to hit a hard corner in 3rd gear at 2k rpm. Note that even in cars with huge turbo lag, that lag is much less pronounced at high revs.

i'm sure there's lag at that speed and in that gear...be in 2nd gear in that speed and you will experience none.

[mayno]

Originally Posted by lawdude

http://www.bmwtis.com/tsb/bulletins/...p/B124606g.htm

that's what it is! I experience this every morning...kinda getting used to it though.

[bavarian19]

wow... just when I thought I heard it all...

'If I put my car in 6th gear at 30mph, I dont feel the surge that I do when I have it in 2nd at the same speed...'



There is no reason to have your car in 3rd gear in anything less than 30-35mph at an absolute minimum. 3rd for me is ATLEAST 40-60 mph... Sounds like you need a lesson in driving stick my friend...

[DIVINE335]

All turbo equiped cars have lag-surge-whatever. Compared to my Stage 3 single turbo VW, my 335 is like driving a naturally aspirated car.

Imagine turning the corner in your car and everything is fine till 3800 rpms that's when 20psi of boost kicks in and wheels break loose and the cars goes just about anywhere it wants. That's real turbo lag. It's like a Jekle and Hyde and it's awsome!