[Dannys M3]

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.

[Terry335]

My 335i auto has lag, but its not that bad. About the same as my old Neon SRT4.

[BoostedBMW]

Not trying to flame you as you are certainly entitled to your opinion, but since there is no such thing as instantaneously spooled turbo's I think that this car has significantly less lag then other turbo cars. I think its just about as lag free as you can really get.

[musc]

Just curious when you would need to floor it in 3rd at 20-25mph?? If you were racing, you wouldn't be in 3rd at that speed, and if you are cruising around town, there is no need to floor it, and if you did need to...just downshift.

As everyone stated, all turbos have lag.

[Adham]

Originally Posted by BoostedBMW

Not trying to flame you as you are certainly entitled to your opinion, but since there is no such thing as instantaneously spooled turbo's I think that this car has significantly less lag then other turbo cars. I think its just about as lag free as you can really get.

i wouldn't go that far ....

[Corey]

It's a compromise. You COULD have "no lag", full boost as soon as you get on the throttle, but you'd be choking at like 4k rpm. I'd much rather have some lag down low and have the power in a more usable rpm range. Most factory turbocharged cars like the 335 are setup like this, a small amount of lag and midrange power you can use on the street. You'll still choke out at high rpm but 90% of the people who buy them will probably never experience this or care to. The application determines the turbo, and thus the compromise that must be made.

[sillygoat]

Originally Posted by catm3

Just curious when you would need to floor it in 3rd at 20-25mph?? If you were racing, you wouldn't be in 3rd at that speed, and if you are cruising around town, there is no need to floor it, and if you did need to...just downshift.

As everyone stated, all turbos have lag.

i was thinking the same thing.

[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...

[lawdude]

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...

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

[daves335i]

Coming from a chipped B5 S4, I had to drive the car in anticipation of the turbo surge. While many times very fun, after driving it for 4 years chipped, I'm finding that I "don't know how to drive my 335i". I've developed such a hit the gas, and then let off before the surge comes on too strong, that I'm doing the same thing with the 335i, and I need to re-learn 'normal' driving style.

I'm wondering if a procede'ed 335i is like a B5 S4, or a chipped B5 S4 as far as this goes. I can live with it like the stock bi-turbo, but I think if it feels like the chipped bi-turbo...I may live with less power to get the smoother engine.

[homerunball]

Originally Posted by schneid4323

Ofcourse if your at about 1k it is gonna have lag, turbo or not all cars take a second to get up from that low of an RPM in 3rd gear, the turbos kick in about 1.4k but you're still in the wrong gear. By no turbo lag people are saying, with a proper launch, the turbos are constant throughout all gears. Obviously if you slam on it that low in third you're gonna have some difficulties.

+1

one more thing:
By the way, 3rd gear is not especially longer in BMW's, the gear ratio is proportional, and slamming the gas at 3rd going 25mph /1000rpm loads the engine more than slamming the gas going at 80mph /6000rpm in the same gear. Engine loading is relative to speed and gear; you don't load an engine more because its on a higher rpm or any less because you are at a low rpm.

[HyperM3]

Originally Posted by daves335i

I'm wondering if a procede'ed 335i is like a B5 S4, or a chipped B5 S4 as far as this goes. I can live with it like the stock bi-turbo, but I think if it feels like the chipped bi-turbo...I may live with less power to get the smoother engine.

I can only speculate that the power curve will remain just as smooth and linear, but with added thrust along the way. Theres no reason why the remapping would make it surge like you have experienced.

[bhvrdr]

Originally Posted by daves335i

Coming from a chipped B5 S4, I had to drive the car in anticipation of the turbo surge. While many times very fun, after driving it for 4 years chipped, I'm finding that I "don't know how to drive my 335i". I've developed such a hit the gas, and then let off before the surge comes on too strong, that I'm doing the same thing with the 335i, and I need to re-learn 'normal' driving style.

I'm wondering if a procede'ed 335i is like a B5 S4, or a chipped B5 S4 as far as this goes. I can live with it like the stock bi-turbo, but I think if it feels like the chipped bi-turbo...I may live with less power to get the smoother engine.

Any time you up the boost of a turbo and run it more out of its efficiency range you will get a slightly more peaky output curve, but the Proceed looks like it is probably maxing only about 12-14psi (judging from stock 8 to 9psi dynos v. the proceede) and the resultant power curves dont look at all as peaky as some of the 4 cylinder turbo motors or perhaps even the biturbo S4 when chipped to 20psi. It still looks pretty smooth comparatively. It's not stock smooth, but it sure makes me want my 335i today.

cheers! Mike

[HyperM3]

Originally Posted by bhvrdr

Any time you up the boost of a turbo and run it more out of its efficiency range you will get a slightly more peaky output curve, but the Proceed looks like it is probably maxing only about 12-14psi (judging from stock 8 to 9psi dynos v. the proceede) and the resultant power curves dont look at all as peaky as some of the 4 cylinder turbo motors or perhaps even the biturbo S4 when chipped to 20psi. It still looks pretty smooth comparatively. It's not stock smooth, but it sure makes me want my 335i today.

cheers! Mike

Another one from Audizine making the crossover. Looks like Audi needs to do something quick to keep all of us from jumping over to the roundel.

[lkevinl]

I notice a small lag... no big deal.

I used to have a 1990 300Z twin turbo... 300hp. Very nice machine... loved that thing!!! I think the twin turbos on that helped with the "lag" effect in a similar way to the 335 but it still had slightly more lag and also had the high pitched turbo whine that does not seem to be present in the 335.

Anyone else have fun in the twin turbo Z? Really could snap your head back!! It was one of the few cars where I could really feel a change when switching the variable suspension to sport mode.

[HyperM3]

Originally Posted by lkevinl

Anyone else have fun in the twin turbo Z? Really could snap your head back!! It was one of the few cars where I could really feel a change when switching the variable suspension to sport mode.

Staying off topic...Yeah I miss my 93ztt all the time. I had a stillen stage 3 on it and used to launch well and once I got to 5krpm the rear would start spinning. It was sick. I loved that car but the lease was up and had to turn it in. Got the M3 right after that and bought it out of lease because I was afraid Id have the same feelings of loss if I turned it in.

[lkevinl]

Originally Posted by HyperM3

Staying off topic...Yeah I miss my 93ztt all the time. I had a stillen stage 3 on it and used to launch well and once I got to 5krpm the rear would start spinning. It was sick. I loved that car but the lease was up and had to turn it in. Got the M3 right after that and bought it out of lease because I was afraid Id have the same feelings of loss if I turned it in.

Kinda funny how Nissan had that 300hp tt Z.... then put it to sleep for a while and then came back with a normally aspirated 350Z at lower hp and now they're likely going to have to move it back up toward the 300 hp range again to compete. That thing was a fun drive that's for sure! Hard to believe that a decade later, I'm driving a 3 SEDAN with twin turbos. Lag or no lag, I love this car!

Sorry, back to the original topic, TURBO LAG SUCKS, but quite unavoidable if you're trying to punch it at low speed in 3rd gear!

[leftcoastman]

I have the Procede and I will tell you that the "lag" becomes more pronounced at some times and less at others. First I will preface it by saying that I'm at high altitude and my understanding is that lag is more pronounced up here.

If I'm running at 1800rpm and floor it, it will build up slowly and hit REALLY hard at 3000rpm. If I'm cruising at 3000rpm, the throttle response is instantaneous and completely without lag.

The former situation may be a combination of the fact that (1) the turbos aren't really spooled at 1800rpm and (2) the increase in power is so intense that NA feels anemic compared to when boost kicks in. It could be argued that without the dramatic increase in power as the tach passes 3000rpm (as a result of the Procede), the vehicle would feel less laggy. But then again, do you want to limit your power increase for the sake of feeling less lag?

It's best described as " hmmm, this is not bad....woah that's fast....OHMYGOD!" when you floor it and as the tach rises.

I can easily break the tires loose accelerating onto the freeway, using 3rd gear.

[boostdf350]

If you wanna feel lag drive a Ford Powerstroke 6.0 or a looney tuned 6.0!!

[Chesmu]

my car has some SERIOUS turbo lag...I've had my 330 for over a year and the turbo STILL hasn't kicked in.

[canucklion]

you've mistaken turbo lack for turbo lag

Originally Posted by Chesmu

my car has some SERIOUS turbo lag...I've had my 330 for over a year and the turbo STILL hasn't kicked in.

[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