[Former_Boosted_IS]

Originally Posted by 335i/335d?

I posted this question also on N54tech:

Is boost measured after the FMIC or before? If boost is measured after IC the boost is controlled by the piggyback/ECU so boost at the intake manifold will be similar as with the factory IC, will this mean that the extra power of the FMIC is only caused by lower intake air temperature? Further this will mean that the turbo's have to work less to make the same boost (due to less pressure loss in the after market FMIC), so the longelivity will improve. Further advantage will probably be that you can drive an higher boost map during warmer days

Am I correct??

Remember all the piggies have IAT boost decay. By lowering the IATs, you will keep full boost longer.

[Sniz]

Originally Posted by 335i/335d?

I posted this question also on N54tech:

Is boost measured after the FMIC or before? If boost is measured after IC the boost is controlled by the piggyback/ECU so boost at the intake manifold will be similar as with the factory IC, will this mean that the extra power of the FMIC is only caused by lower intake air temperature? Further this will mean that the turbo's have to work less to make the same boost (due to less pressure loss in the after market FMIC), so the longelivity will improve. Further advantage will probably be that you can drive an higher boost map during warmer days

Am I correct??

yes u r

Originally Posted by Former_Boosted_IS

Remember all the piggies have IAT boost decay. By lowering the IATs, you will keep full boost longer.

this is especially important when running around on hot days. Summer days around here can be brutally hot and humid, however my 335 still pulled hard on the hottest of days and the IAT logs I did in the heat showed why

[Mad335]

Does the Helix intercooler fit an E93 auto trans with standard front bumper? I heard that there is a big difference in between mounting intercoolers behind M-tech bumpers and standard ones. Anybody knowledgeable on this subject? Plz help!

[Septro]

Originally Posted by Mad335

Does the Helix intercooler fit an E93 auto trans with standard front bumper? I heard that there is a big difference in between mounting intercoolers behind M-tech bumpers and standard ones. Anybody knowledgeable on this subject? Plz help!

My impression was that the MTech bumpers had more room than stock for aftermarket ICs, but a definitive answer can be made by those that have both.

[Ilma]

Originally Posted by jpsimon

... plus he thinks you can't make more power with a FMIC. It's been shown numerous times that you can. Pressure drop + raise the boost back up = more power than before, along with more stable IATs. It's not a complex equation

So with the Procece, how does one raise the boost back up?

Increasing the user torque values?

[OpenFlash]

Originally Posted by Ilma

So with the Procece, how does one raise the boost back up?

Increasing the user torque values?

You can do that. Or you can just use the next map stage up. It will bring boost back up to normal level and provide another boost in power.

Shiv

[GeorgeSmooth]

Originally Posted by shiv@vishnu

You can do that. Or you can just use the next map stage up. It will bring boost back up to normal level and provide another boost in power.

Shiv

Wont the stock ECU compensate for the slight loss in boost.

[M&M]

Originally Posted by GeorgeSmooth

Wont the stock ECU compensate for the slight loss in boost.

Georgie, the way I see it (with some 1st hand experience from when I had the Spearco), is the boost control logic is closed loop. So it reads off the map (just before the TB), & then it requests whatever % duty cycle from the wastegate solenoids to reach the boost target. Correct me if I'm wrong here Shiv.

So with a more efficient cooler you get less pressure loss through the cooler. So instead of the boost being 1.2 bar in the IC inlet & 1.0 bar on the IC oulet for instance, you may get 1.2 bar in & 1.2 bar out for a theoretical perfect cooler with no pressure loss.

So if the ECu reads 1.2 bar at the MAP, according to the closed look logic it will deem that to be too high & adjust the boost down to 1 bar. So effectively you will end up with the same boost as you had with the stock cooler.

BUT, you will do it with less duty cycle. The turbos will be less stressed & the heat build up & efficiency losses at high rpm will be less. And then of course you can turn the boost up to 1.2 bar & use around the same DC at you had on 1bar.

[Septro]

Originally Posted by M&M

Georgie, the way I see it (with some 1st hand experience from when I had the Spearco), is the boost control logic is closed loop. So it reads off the map (just before the TB), & then it requests whatever % duty cycle from the wastegate solenoids to reach the boost target. Correct me if I'm wrong here Shiv.

So with a more efficient cooler you get less pressure loss through the cooler. So instead of the boost being 1.2 bar in the IC inlet & 1.0 bar on the IC oulet for instance, you may get 1.2 bar in & 1.2 bar out for a theoretical perfect cooler with no pressure loss.

So if the ECu reads 1.2 bar at the MAP, according to the closed look logic it will deem that to be too high & adjust the boost down to 1 bar. So effectively you will end up with the same boost as you had with the stock cooler.

BUT, you will do it with less duty cycle. The turbos will be less stressed & the heat build up & efficiency losses at high rpm will be less. And then of course you can turn the boost up to 1.2 bar & use around the same DC at you had on 1bar.

Great explanation. The problem (if you want to call it that) is folks that install the IC aren't geared to minimizing the amount of boost required - but will just up the boost back up again for more power IMO.

With your description, 1lb of boost=15whp, so most aftermarket ICs equate to 15-20whp gain dependent on efficiency (assuming you are going to up the boost to meet the original power target)?

[GeorgeSmooth]

Originally Posted by M&M

Georgie, the way I see it (with some 1st hand experience from when I had the Spearco), is the boost control logic is closed loop. So it reads off the map (just before the TB), & then it requests whatever % duty cycle from the wastegate solenoids to reach the boost target. Correct me if I'm wrong here Shiv.

So with a more efficient cooler you get less pressure loss through the cooler. So instead of the boost being 1.2 bar in the IC inlet & 1.0 bar on the IC oulet for instance, you may get 1.2 bar in & 1.2 bar out for a theoretical perfect cooler with no pressure loss.

So if the ECu reads 1.2 bar at the MAP, according to the closed look logic it will deem that to be too high & adjust the boost down to 1 bar. So effectively you will end up with the same boost as you had with the stock cooler.

BUT, you will do it with less duty cycle. The turbos will be less stressed & the heat build up & efficiency losses at high rpm will be less. And then of course you can turn the boost up to 1.2 bar & use around the same DC at you had on 1bar.

What I said in the in one sentence you said in paragraphs hehe. Boost will stay the same, although the volume of oxygen in the air might be higher hence the possible increase in power, although I think in the 335i case its more a matter of consistant power by keeping intake temperature constant.

[JPA]

Will the Helix fit the 135i? Sorry if already asked and answered...

[bulldog_yyc]

Originally Posted by JPA

Will the Helix fit the 135i? Sorry if already asked and answered...

I believe the revised version does

[TurboBullett@Ambient Thermal Management]

Originally Posted by JPA

Will the Helix fit the 135i? Sorry if already asked and answered...

it fits with some minor trimming on the 135i.

[dr.roro]

When you guys install this in your shop on the 335i, do you ever need to do any trimming?

[Htown09]

Does the most recent helix require any cutting for a E90 335i?

[E90MTL]

It did for me. quite a bit actually. the same as in the install link they send you with the FMIC. cut an inch of plastic at the bottom lip and all the excess thick plastic around the mounting screws up to the bumper support.

[elitt13]

Do helix send IC from France (Europe) and what is the shipping cost??

I send a mail but I had nos response

thanks by advance

[D.B.S]

Originally Posted by elitt13

Do helix send IC from France (Europe) and what is the shipping cost??

I send a mail but I had nos response

thanks by advance

Talk about reviving a two year old thread... Try asking that question here, since they regularly check this thread:

http://www.e90post.com/forums/showthread.php?t=232100
or check out their website: http://www.helix13.com/bmw

[elitt13]

thanks army 335ix I'll go .......

[FLA 335]

Originally Posted by Army335xi

Talk about reviving a two year old thread... Try asking that question here, since they regularly check this thread:

http://www.e90post.com/forums/showthread.php?t=232100
or check out their website: http://www.helix13.com/bmw

+97864 i was about to say the same... LOL

[Novator]

So not cutting or trimming? Just bolt on?