how much power do i want this car to make?

Post by **matthew1** » 09 Jan 2016, 19:46

I see every speed mod as gain/$.

Most do. I'm no unicorn.

RIP kit I have to ask: how much air charge temperature*density is lost in 14 inches of travel, given the entire chain is 40-some inches?

Post by **FLXC90** » 09 Jan 2016, 22:44

It's not just the reduced distance and turns in the plumbing-In principle, the RIP kit allows you to draw air from the bottom of the intercooler where it is supposed to be cooler. I haven't seen anyone with temp probes in the top and bottom of their ICs, but that is the idea behind it, not so much absolute power gain, just less heat soak, like cross drilled rotors vs. fade

Post by **j-dawg** » 10 Jan 2016, 01:00

Not sure I understand how that's supposed to work. Drawing out of the bottom will not mean cooler air.

I'm reading the IPD blurb about its $400 RIP kit, and it's complete absurdity.

Since hot air rises, routing the air out the bottom of the intercooler reduces outlet temperature (etc)

"Hot air rising" does not make any contribution to intercooler performance when all of the air is being drawn through at high speed. The effect of buoyancy is about a gajillionth of that of the pressure gradient forcing air through the intercooler. The air that flows in all flows out very quickly; it does not collect and separate into hot and cold. Buoyancy effects on a system with vertical flow are negligible. IPD's description of how its RIP kit works is like arguing that the top of Niagara is hotter than the bottom because all of the warmer water molecules rise to the top.

If IPD's use of "hot air rising" refers to the cooling air flowing past the intercooler through the grille and air dam, that's equally ludicrous. The temperature difference from top to bottom owing to height is pretty much zero: the height differential is way too small for "hot air rising" to have any effect. If we're not under a roof, the air around our feet is not colder than the air around our heads. Those effects aren't observable at the length scale of a car moving through open air.

I've got no problem with the RIP kit in principle - it's simpler routing, which I appreciate. Rumors I've read on the internet (always reliable!) say Volvo routed piping on early turbo 850s that way, making the change only when frozen condensate from the bottoms of intercoolers was getting drawn into throttle bodies in cold weather. But the way IPD markets its overpriced kit is pure stories. If they can't come up with a better explanation than that, I'm taking it as confirmation that the RIP kit does nothing for performance.

Post by **tryingbe** » 10 Jan 2016, 04:58

The upper in/out let of the stock intercooler is also bigger than the bottom one.

I'd but the do88 drop in intercooler first, if I have do it all over again.

biohazrd76 · Post by **biohazrd76** » 10 Jan 2016, 05:46

My next buy will most likely be the compete exhaust with downpipe. I think I'm doing ipd system, for quality and sound. My old 850 had a home made system that sounded like farting on a snare drum. So this time I'm going for the best quality. And all the videos sound like its a good note produced. The intercooler is on the bottom of the list. Now I really want to swap out my compressor cover and exducer wheel for some ard billet parts 19t cover and wheel.does the entire turbo have to come out for this job? It seems like the exhaust housing stays on the block and you only remove the intake side. Is it critical to have the shaft balanced after reassembly? Ard says theirs are balanced. I'll be honest I'm not a trained mechanic by any means. But I have a good idea how these cars work, I've been doing it for 10 years in my free time...

Not wanting to ruin his turbo-

biohazrd76 · Post by **biohazrd76** » 10 Jan 2016, 05:55

I need to recruit a coach here for performance questions,someone who has done it before.I have alot of work ahead and I'm sure some things need to happen before others. Anyone have video of their modified 850 burnouts,donuts flybys?

Seaway · Post by **Seaway** » 10 Jan 2016, 06:30

19t will require green injectors, and a new tune at the very least. You should also consider a new higher flow fuel pump and an upgraded intercooler. A full stage zero is also necessary.

The tune is the most important element. If it is not good, you will bend rods.

Post by **mecheng** » 10 Jan 2016, 07:08

j-dawg wrote:Not sure I understand how that's supposed to work. Drawing out of the bottom will not mean cooler air.

I'm reading the IPD blurb about its $400 RIP kit, and it's complete absurdity.
Since hot air rises, routing the air out the bottom of the intercooler reduces outlet temperature (etc)
"Hot air rising" does not make any contribution to intercooler performance when all of the air is being drawn through at high speed. The effect of buoyancy is about a gajillionth of that of the pressure gradient forcing air through the intercooler. The air that flows in all flows out very quickly; it does not collect and separate into hot and cold. Buoyancy effects on a system with vertical flow are negligible. IPD's description of how its RIP kit works is like arguing that the top of Niagara is hotter than the bottom because all of the warmer water molecules rise to the top.

If IPD's use of "hot air rising" refers to the cooling air flowing past the intercooler through the grille and air dam, that's equally ludicrous. The temperature difference from top to bottom owing to height is pretty much zero: the height differential is way too small for "hot air rising" to have any effect. If we're not under a roof, the air around our feet is not colder than the air around our heads. Those effects aren't observable at the length scale of a car moving through open air.

I've got no problem with the RIP kit in principle - it's simpler routing, which I appreciate. Rumors I've read on the internet (always reliable!) say Volvo routed piping on early turbo 850s that way, making the change only when frozen condensate from the bottoms of intercoolers was getting drawn into throttle bodies in cold weather. But the way IPD markets its overpriced kit is pure stories. If they can't come up with a better explanation than that, I'm taking it as confirmation that the RIP kit does nothing for performance.

My thoughts exactly! The high pressure doesn't allow the hot air rising affect, and over a height of an intercooler, who are the kidding? Less piping length, maybe a slight benefit. If I wanted more hp I would make a water cooling spray for the intercooler like the STI had

biohazrd76 · Post by **biohazrd76** » 20 Jan 2016, 08:20

OK, so after charging the battery, I finally got the car out for the first real test run since cbv install, ecu swap back from ipd to stock, diagnostic check and clear. FINALLY pushing out 10psi(on aftermarket gauge) steady . Before it was stuck at the dreaded half boost. So now that a baseline has been developed I will continue with intake and exhaust. So far this seems to be proper turbo behavior.

Post by **abscate** » 20 Jan 2016, 08:51

Your welcome to post here but this is the more sedate Forum for 850s - there is a Performance Forum down below that might get more views by folks interested in making smoke.

Now, get the h*** of our Lawnmower Syndrome

how much power do i want this car to make?

Re: how much power do i want this car to make??