Single turbo no intercooler questions
Thread Starter
Joined: Jun 2006
Posts: 505
Likes: 8
From: Fayetteville Arkansas
Single turbo no intercooler questions
I am trying to find info on people running single turbo no intercooler. I can't find anything in the search engine so I gotta ask. Can someone point to some threads already on the subject or can we talk now. I am going to run a 13B RE Cosmo, streetport and built. I am interested in how much boost an horsepower is possible with no intercooler. Looking at GT35R with Electomotive TEC3R. I just don't want to hack up the front of my car with an intercooler and I want as little lag as possible. I might consider water injection if I have to.
GhostSS
Joined: May 2005
Posts: 281
Likes: 0
From: Phoenix, AZ
I was reading cozmos thread and holy ****... he gets intake temps of 50C... even with water/meth
Even under constant boost my intake temps have never went above 20C on a 80F day. (im running FMIC)
Even under constant boost my intake temps have never went above 20C on a 80F day. (im running FMIC)
Senior Member
Joined: Jul 2003
Posts: 291
Likes: 0
From: San Jose
Where and how are you measuring your intake temps. Are you really saying that under boost your intake temps are lower than the ambient air? That seems rather impossible without some other source of cooling.
-Andy M.
Trending Topics
Tracking a friends FD......GT35R, large SMIC....runing 10-12 pounds I was seeing 52-53C according to the PFC.
Less then half that seems impossible without chemical cooling of some type.......
^ You are saying that with nothing more than air/air intercooling, that on an 80* F day, you only got 71.6*F (20*C) intake temperatures? That's impossible. You can't get lower than ambient with air/air intercooling alone.
Darkside FD
Joined: Jan 2004
Posts: 1,175
Likes: 0
From: AZ
45-50C with water is where you want to be...I am trying to tune things so I am right around there at all times. Maybe slightly below.
With the water/alcohol (50/50) and at a ratio of 15% injectant to fuel, I was very much below ambient to the tune of 25C intake temps when it was nearly 40C outside. I am trying to stray away from this dramatic change and make the system react to keep intake temps the same (as much as possible) at all times. I have proven that i can cool the air down below ambient.
The joy of my setup is that my intake temps are the same whether my car has been sitting at idle for an hour, or cruising at 70mph, I have ZERO heat soak. With the temps out here now in the mid 70s (F) during the day, I have 38-42C intake temps in vacuum and low boost. Under full boost (currently 15psi) with 100% water I am right around 45C...
Which is where I want the temps to be...with the water injection and how cool my engine runs (oil and coolant temps) I am not in the slightest worried about detonation from running too hot an intake temp.
Besides....looking at how the water injection COOLS the air is looking at only a small part of its total benefit to the engine. Water controls the flame front in the combustion chamber and this suppresses preignition. This allows the use of increased timing and much leaner AFR. That is the HUGE benefit. You can have much hotter IAT without seeing detonation. Having the consistency of intake temp, helps with the consistency of my tune.
With the water/alcohol (50/50) and at a ratio of 15% injectant to fuel, I was very much below ambient to the tune of 25C intake temps when it was nearly 40C outside. I am trying to stray away from this dramatic change and make the system react to keep intake temps the same (as much as possible) at all times. I have proven that i can cool the air down below ambient.
The joy of my setup is that my intake temps are the same whether my car has been sitting at idle for an hour, or cruising at 70mph, I have ZERO heat soak. With the temps out here now in the mid 70s (F) during the day, I have 38-42C intake temps in vacuum and low boost. Under full boost (currently 15psi) with 100% water I am right around 45C...
Which is where I want the temps to be...with the water injection and how cool my engine runs (oil and coolant temps) I am not in the slightest worried about detonation from running too hot an intake temp.
Besides....looking at how the water injection COOLS the air is looking at only a small part of its total benefit to the engine. Water controls the flame front in the combustion chamber and this suppresses preignition. This allows the use of increased timing and much leaner AFR. That is the HUGE benefit. You can have much hotter IAT without seeing detonation. Having the consistency of intake temp, helps with the consistency of my tune.
Last edited by cozmo kraemer; Dec 4, 2007 at 09:32 PM.
Darkside FD
Joined: Jan 2004
Posts: 1,175
Likes: 0
From: AZ
I will have logs of a 20 minute track session that I will post come the middle of January (track session is the first week of Jan). I will have logs from the dyno here in the next couple of weeks. Have to coordinate a lot people to be there for the dyno runs and that is delaying things slightly.
I understand you may be seeing those readings but that result isn't physically possible. You've got a sensor calibration issue. Something isn't accurate. Unless you too are running some form of alcohol/water injection, or an air to water intercooler with an ice tank, you can not get cooler air temps post turbo than ambient outside air. This is not possible with an air to air intercooler unless you are spraying it down with something very cold. If you are getting a colder reading, something is wrong with a sensor, gauge, or calibration somewhere. I'd check into that.
Darkside FD
Joined: Jan 2004
Posts: 1,175
Likes: 0
From: AZ