Alfa Romeo Stelvio Forum banner
21 - 33 of 33 Posts

· Registered
Stelvio Quadrifoglio
Joined
·
62 Posts
There is zero chance of sucking in water. The cone filters are fed from the same holes that feed the stock intake and water (not drops) would have to pour in before it would be a problem. If water got that high, the stock system would suck it in like a straw vs an open cone filter. If the cone filters were exposed directly to the rain, then yes, that would not be good.

Also a few drops of water down the intake would actually help with IAT's. There are guys that spray water down the intake to help cool the charge (But wet filters are bad for flow).
The hood vents may be a potential issue where water might be able to penetrate, but I'm not sure how much water would be required to actually cause hydrolock. From what I read.. it would need to be a substantial amount. I don't know much of how it all works out though driving through extreme wet conditions.. I'm a bit more conservative with intake mods. But, I fully support your idea of making the engine able to breath better.

My friends Charger SRT hydrolocked after driving it on a rainy day only a day after he had one of those low mounted cold intakes installed.
 

· Registered
Stelvio Quadrifoglio
Joined
·
62 Posts

· Registered
2018 Stelvio Quad
Joined
·
114 Posts
Discussion Starter · #23 ·
The hood vents may be a potential issue where water might be able to penetrate, but I'm not sure how much water would be required to actually cause hydrolock. From what I read.. it would need to be a substantial amount. I don't know much of how it all works out though driving through extreme wet conditions.. I'm a bit more conservative with intake mods. But, I fully support your idea of making the engine able to breath better.
Yeah thanks... A long time ago when I was a teen and driving around in my Integra, me and a buddy made "Air scoops" that hung below the front bumper and grabbed air and worked really well with the stock sealed air box. But... lowered integra with low hanging air scoop and a deep puddle, I actually had to "Drive out" of it. It made gurgling noises and barely moved but it actually did not hydro lock the engine! The K&N filter was dripping wet! I had to drive home with no air filter..

Anyways, back on topic here's a pic of the backside. This is what you see if you were to look thru the hood vents. Even if rainy, wet air was being sucked thru the vents (its blows air out), I would still not be worried too much. As far as the 2020 having a different intake, I would be surprised. It might as Alfa works in mysterious ways but I was just looking at the intake on the "Totally Maserati" Grecale Trofeo engine and it looks unchanged.

(side note: you can see my high pressure Venturi plugged with a yellow cap)

Automotive tire Hood Motor vehicle Automotive design Automotive exterior
 

· Registered
2018 Stelvio Quad
Joined
·
114 Posts
Discussion Starter · #26 ·
Update.. I did get a few draggy runs in today and got mixed results. I did a very quick run down a sketchy street and I blew the start big time. Still ran a respectable 12.1 but at 115 mph, which was a great first result (115 was the very best I could run stock with my stock wheels, more on this).

So then I went to a long street near a beach, expecting great results but pretty much got the same. Sucks. The only good news was that I never got below 113 mph and ran another one at 115. That is the best mph I've run with my wheels. 1/4 mile times were not good (~12.2) but I noticed that I am about .2 (point two) seconds off my 60 ft times. The street that we usually run on has proven to be faster by about, you guessed it, about .2 seconds and given me a 1 to 2 mph boost.

Here's the breakdown from our favorite street:

Very best stock (*) 11.8 @115 mph
(*) stock was all over the place, I ran exactly one good 11.8 and kept it..

Stock with wheels: 12.1 @112 mph (I think)

Jb4: 11.8 @117 mph

Jb4 with wheels: 12 flat @113 mph

I've learned not to get my hopes up too much with the quad. Its not a very consistent and more so than not has let me down. I'm feeling lazy but tomorrow morning, I may take the quad to "the street" and see what she does with the BC wheels. Rain is coming tomorrow, later in the day and swapping wheels is such a PIA... DA was really good today at the beach. Our street is up in elevation and DA will be worse but it's the maximum allowed down slope allowed by draggy. So we shall see.

Ken

P.s. When I took her out today, once again, it felt like lag has been cut in half and man did it pull hard.. I was thinking she is gonna run stock times easily.. sigh, there is still hope, the intake isn't coming out just yet.
 

· Registered
2018 Stelvio Quad
Joined
·
114 Posts
Discussion Starter · #28 ·
Ok, I ran a few runs on "The street" this morning and came back pretty disappointed but there was one interesting thing, I got in a 116 Mph run. Which would be fast for stock wheels, let alone my BC 21" wheels. The 115 from yesterday and the 116 isn't a fluke, and that made up for my heavy wheels (mph anyways).

So the notes: Mph kept dropping with each run. 116 for the 2nd run (I blew my first run, hit the revlimiter..) and ending up in the 112 mph range at the end. So either heat soak is getting me or the ECU is offsetting what the JB4 is giving me or both. The slowest mph I ran today was about the fastest I've run with my wheels before. 1/4 mile times were just not going to happen today. The best run of the day, I ran 12.2 but my 60ft was 2.09. I got a 60ft today down to 1.9 but the quad was already running slow. So lets just say "at best", she would run a 11.9 with my heavy wheels and maybe 11.7 with stock. .

Is the intake making a difference? Yes. Mph is up up by around 3-4 mph.

Is the intake worth it? Eh... 1/4 mile times is what matters and at best, I'm still around stock. For sure lag is cut and I think there is a decent gain thru the rev range. I also threw no codes today. Last time I went there with the JB4, I had a few turbo performance codes (which could be a failing diverter valve). So cutting lag will help in this regard. But in the end, if you can't brag about a faster 1/4 mile time, then its all for nothing. The final straw is that you can barely hear a difference. If it sounded way better, than maybe.

Final words.. The quad is just not a numbers only car. If it had launch control and it would be more consistent then I think we would see improvements. I truly believe its making more hp but I think the higher hp might be hurting the launch. I guess if you want a numbers only car, get a Tesla. So until someone releases a proven and reliable tune, I'm bowing out of the 1/4 mile game.

Ken

P.s. I threw a cold start CEL a few weeks ago after the quad sat for over a month. I'm gonna let her sit for a few weeks and see but my warranty will be up here real soon and the stock intake may have to go in sooner than not.
 

· Registered
2018 Stelvio Quad
Joined
·
114 Posts
Discussion Starter · #29 ·
One last thing.. It rained on me on the way home and I even took my car thru a touchless (gas station quicky) wash and I had zero water on the filters. Yes it was raining and I got my car washed.. LOL But hear me out, the car was so filthy on the way home that I couldn't use my wipers as it would just smear all the crap on my windshield. I wasn't the only person at the car wash too.. LOL
 

· Registered
2020 Stelvio Quadrifoglio
Joined
·
608 Posts
Thanks for the detailed accounts. It could be that your FYI air intake is still soaking a lot of heat from the rest of the engine at take off speeds (0 - ~25-30 MPH) and it hurts the take off. I remember my home made air intake was hurting 3 tenths in the quarter mile consistently (although it felt it pulled harder at higher speeds)...perhaps something similar is happening with your system. I guess you could try to isolate those air filters better from the rest of the engine.
 

· Registered
Stelvio Quadrifoglio
Joined
·
62 Posts
Thats pretty interesting.. So my best 0-60 time to date was 3.9. Best 0-30 was 2.44. Still getting a hang of how to properly launch this thing but I need to find a clear flat road where i can test the 1/4. I will post updates on 0-60 and 1/4 with the Squadra+200cel cat next month
 

· Registered
Joined
·
5 Posts
Do you have any videos of the sound in this setup? Revving under the hood stationary and in cabin on the move?
I'm in search for an intake to give me more whooshy sounds. I know ideal race have one but I'm in UK and at $1600 plus duty and delivery its a bit excessive for just some sound. So now I'm waiting for one from an UK company which is currently in development by Airtec. Pretty much same setup as ideal race but not carbon and a lot cheaper.
I know it'll probably have a some heat soak but I think that's fine as I don't use all 510bhp all the time. Whilst driving normally around town I would rather have some cool sounds 100% of the time than losing 20/25bhp(if that) 20-30% of the time. But I know you guys chase draggy times so I understand.
Bit strange how you're saying you don't get much sound though. Cones too far away to the front or not long enough piping for air to resonate louder sounds?
 

· Registered
Stelvio Quadrifoglio
Joined
·
62 Posts
Do you have any videos of the sound in this setup? Revving under the hood stationary and in cabin on the move?
I'm in search for an intake to give me more whooshy sounds. I know ideal race have one but I'm in UK and at $1600 plus duty and delivery its a bit excessive for just some sound. So now I'm waiting for one from an UK company which is currently in development by Airtec. Pretty much same setup as ideal race but not carbon and a lot cheaper.
I know it'll probably have a some heat soak but I think that's fine as I don't use all 510bhp all the time. Whilst driving normally around town I would rather have some cool sounds 100% of the time than losing 20/25bhp(if that) 20-30% of the time. But I know you guys chase draggy times so I understand.
Bit strange how you're saying you don't get much sound though. Cones too far away to the front or not long enough piping for air to resonate louder sounds?
A cheaper alternative is going with the higher flow combustion air filter like BMC or Sprint. I will eventually get a Go Fast Bits Diverter vent to atmosphere valve to get that turbo purge noise
 
21 - 33 of 33 Posts
Top