[slay2k]

Do you think there will be more pressure drop in the 7.5" HD, or less ?

Originally Posted by studio54

I bought the VRSF 5" HD one, and running stock turbos, and all i can say is that there is some pressure drop, if you are sensitive to that, but cooling is great, greater than the Forge FMIC i had previously, like night and day.

[studio54]

Originally Posted by slay2k

Do you think there will be more pressure drop in the 7.5" HD, or less ?

It has the same design but it's bigger, so probably a little more pressure drop.

[mike@x-ph.com]

Customer pictures: CSF vs Stock

[Rule1977]

Originally Posted by slay2k

Do you think there will be more pressure drop in the 7.5" HD, or less ?

I'm running the VRSF 7.5" Race with stock turbos and I haven't noticed any difference as far as pressure drop... If there is it's very little. I highly recommend the the 7.5" Race!

[Mistajay]

Really interesting tread.

I do a lot of hdpe event with my 335i.

I bought 3 years ago the active autowerke race version with the shroud and everything. Do you think the Wagner competition it's better?

I upgrade all my cooling with csf rad and the race oil cooler from evolution racewerk.
N55 PS1
PS2 soon E90

Thanks!

[mike@x-ph.com]

Originally Posted by Rule1977

I'm running the VRSF 7.5" Race with stock turbos and I haven't noticed any difference as far as pressure drop... If there is it's very little. I highly recommend the the 7.5" Race!

Originally Posted by Mistajay

Really interesting tread.

I do a lot of hdpe event with my 335i.

I bought 3 years ago the active autowerke race version with the shroud and everything. Do you think the Wagner competition it's better?

I upgrade all my cooling with csf rad and the race oil cooler from evolution racewerk.
N55 PS1
PS2 soon E90

Thanks!

Hi,
Since you are upgrading your turbo, i recommend Wagner EVO III or VRSF 7.5" Race

[mike@x-ph.com]

VRSF BMW Race intecooler 135 335 - Thank you Ronald for the picture

[Rule1977]

Been very impressed with it!

[mike@x-ph.com]

Originally Posted by Rule1977

Been very impressed with it!

[Grant_McGrath]

Im about to do the standard install of all the bolt ons ( pod filter intake, charge pipe vrsf, catless downpipes vrsf, exhaust corsa, Precision Raceworks ignition kit, mhd tune and front mount vrsf competition stepped ) and have a question in regards to the front mount side of things. When puting all these parts in should i be changing the stock intercooler piping? I will have standard turbos still. This great group is full of knowledgeable people and hope I can get some info or ideas for anything extra that should be done!!

[Rule1977]

Originally Posted by Grant_McGrath

Im about to do the standard install of all the bolt ons ( pod filter intake, charge pipe vrsf, catless downpipes vrsf, exhaust corsa, Precision Raceworks ignition kit, mhd tune and front mount vrsf competition stepped ) and have a question in regards to the front mount side of things. When puting all these parts in should i be changing the stock intercooler piping? I will have standard turbos still. This great group is full of knowledgeable people and hope I can get some info or ideas for anything extra that should be done!!

The VRSF 7.5" Comp. will come with the couplers and the aluminum j pipe to replace the stock one.

[streetpro]

Does this 7,5'' thick core clear ACC unit (active cruise control - radar)?

[Grant_McGrath]

Originally Posted by Rule1977

The VRSF 7.5" Comp. will come with the couplers and the aluminum j pipe to replace the stock one.

Thanks heaps man

[kwatkins12]

Originally Posted by Grant_McGrath

Im about to do the standard install of all the bolt ons ( pod filter intake, charge pipe vrsf, catless downpipes vrsf, exhaust corsa, Precision Raceworks ignition kit, mhd tune and front mount vrsf competition stepped ) and have a question in regards to the front mount side of things. When puting all these parts in should i be changing the stock intercooler piping? I will have standard turbos still. This great group is full of knowledgeable people and hope I can get some info or ideas for anything extra that should be done!!

My best advice for install of intercooler is just cut all the plastic out of the way in the beginning. I tried to save small parts that ended up creating headaches and being cut later and wasted a lot of time. As said above the intercooler comes with new piping and its super easy to install when doing the new charge pipe as well. I put all the piping in first raised the intercooler with a jack and then tightened everything up.

[Tiago@VRSF]

Originally Posted by Rule1977

The VRSF 7.5" Comp. will come with the couplers and the aluminum j pipe to replace the stock one.

Couplers, clamps and lower charge pipe are included with all VRSF intercoolers.

Originally Posted by streetpro

Does this 7,5'' thick core clear ACC unit (active cruise control - radar)?

Unfortunately anything larger than a 5" will not fit the ACC.

[slay2k]

Originally Posted by srey

What about pressure drop with stock turbos and no dps? I know that's been discussed often over the years, but how much more laggy would the 7" be than the 5"? Vs stock?

Much more laggy in 2nd. No noticeable lag, and feels amazing, in higher gears.

I'm tired of people claiming that 7"+ intercoolers on stock turbos don't show any lag. That's nonsense. From a physics standpoint alone, the 7.5" is like twice the volume of OEM, so obviously it takes the turbos longer to fill it with air, esp. at the low end of psi range / low RPM. Doesn't matter how wind-tunnel-tested, or hamster-safe, or whatever your end tanks are.

I bought the VRSF 7.5" HD after every vendor told me there'd be no noticeable difference. And guess what? The lag is very noticeable down low in 2nd. I'm running VRSF CP, DP, MHD 2+. It bothers me enough to consider swapping it out for a well-designed 5", because I want my 2nd gear to be explosive and I'm "sensitive" enough to feel the difference.

I also noticed my max oil temps went up by 10-15 degrees after install. Could be the higher psi, sure, but I suspect the restricted airflow to the rest of the system (e.g. radiator) that is now blocked by the humongous FMIC isn't helping.

[335ilover5070]

Arm 7.5 " Race FMIC

[Rule1977]

Originally Posted by slay2k

Much more laggy in 2nd. No noticeable lag, and feels amazing, in higher gears.

I'm tired of people claiming that 7"+ intercoolers on stock turbos don't show any lag. That's nonsense. From a physics standpoint alone, the 7.5" is like twice the volume of OEM, so obviously it takes the turbos longer to fill it with air, esp. at the low end of psi range / low RPM. Doesn't matter how wind-tunnel-tested, or hamster-safe, or whatever your end tanks are.

I bought the VRSF 7.5" HD after every vendor told me there'd be no noticeable difference. And guess what? The lag is very noticeable down low in 2nd. I'm running VRSF CP, DP, MHD 2+. It bothers me enough to consider swapping it out for a well-designed 5", because I want my 2nd gear to be explosive and I'm "sensitive" enough to feel the difference.

I also noticed my max oil temps went up by 10-15 degrees after install. Could be the higher psi, sure, but I suspect the restricted airflow to the rest of the system (e.g. radiator) that is now blocked by the humongous FMIC isn't helping.

Weird because I have none of those problems.

[Torgus]

Originally Posted by Rule1977

Weird because I have none of those problems.

He probably has a boost leak.

He should show a log before and after IC if he wants to make that claim.

Even if it did add lag(it doesn't) the cooling gains and being able to run more boost and timing would outweigh any lag(which there is none).

[slay2k]

Originally Posted by Rule1977

Weird because I have none of those problems.

I'm referring to building boost from scratch (e.g. daily driving, not track). So going from 0 to 10-15psi say in 2nd gear. If you start at 2500rpm and floor it, the difference to me is very noticeable. It takes much longer to build boost.

Originally Posted by Torgus

He probably has a boost leak.

He should show a log before and after IC if he wants to make that claim.

Even if it did add lag(it doesn't) the cooling gains and being able to run more boost and timing would outweigh any lag(which there is none).

Sure, bud, here you go.

Stage 1: https://datazap.me/u/slay/third-run-...og=0&data=3-22
Stage 2+: https://datazap.me/u/slay/stage-2-75...og=0&data=3-21

Running more boost doesn't make a damn bit of difference when you still have to build that boost from 0. The turbos aren't spinning any faster and now you have more IC core volume to fill before air hits the other side.

With your logic, we could build a tunnel to Tokyo with a giant turbo on one side, put people into capsules and boom -- we just invented teleportation! Air will instantly arrive on the other side and people pop right out! No lag, right?

Or maybe the laws of physics don't apply to intercoolers?

[Rule1977]

Originally Posted by slay2k

I'm referring to building boost from scratch (e.g. daily driving, not track). So going from 0 to 10-15psi say in 2nd gear. If you start at 2500rpm and floor it, the difference to me is very noticeable. It takes much longer to build boost.

Sure, bud, here you go.

Stage 1: https://datazap.me/u/slay/third-run-...&data=3-22
Stage 2+: https://datazap.me/u/slay/stage-2-75...&data=3-21

Running more boost doesn't make a damn bit of difference when you still have to build that boost from 0. The turbos aren't spinning any faster and now you have more IC core volume to fill before air hits the other side.

With your logic, we could build a tunnel to Tokyo with a giant turbo on one side, put people into capsules and boom -- we just invented teleportation! Air will instantly arrive on the other side and people pop right out! No lag, right?

Or maybe the laws of physics don't apply to intercoolers?

Yeah I understand what you're saying and I don't have that problem.. how many miles are on your car/turbos?

[BM3Rrrr]

Originally Posted by slay2k

I'm referring to building boost from scratch (e.g. daily driving, not track). So going from 0 to 10-15psi say in 2nd gear. If you start at 2500rpm and floor it, the difference to me is very noticeable. It takes much longer to build boost.



Sure, bud, here you go.

Stage 1: https://datazap.me/u/slay/third-run-...og=0&data=3-22
Stage 2+: https://datazap.me/u/slay/stage-2-75...og=0&data=3-21

Running more boost doesn't make a damn bit of difference when you still have to build that boost from 0. The turbos aren't spinning any faster and now you have more IC core volume to fill before air hits the other side.

With your logic, we could build a tunnel to Tokyo with a giant turbo on one side, put people into capsules and boom -- we just invented teleportation! Air will instantly arrive on the other side and people pop right out! No lag, right?

Or maybe the laws of physics don't apply to intercoolers?

Just looking at your two logs

First log (stg 1):
Time - 227.62, Boost psi: -1.1
Time - 228.32, Boost psi:+12.1
0.70 seconds

Second log (stg 2)
Time - 98.17, Boost psi: -1.1
Time - 98.96, Boost psi: +17.5
0.79 seconds

So what you are saying is you "feel" the 0.09 seconds of lag?