Options for Turbo Cold Air Intake w/ MAFT

[daren_p]

Stock maf reads before the intercooler so of course a cai will show lower air temps.
On a stock setup you can not see the air temp after the intercooler, unless you have added a airtemp sensor and additional logging equipment.

If you have a properly sized intercooler, the intercooler will lower the temps to almost ambient air temps. Intake temperature should not effect the post intercooler temp very much.


-Seth

Yes I know the stock maf reads the temp before the turbo, that was part of my point . The intercooler can only cool a certian amount, ie it will cool the incoming charge the same amount depending on outside temp/airflow etc. For example (these are just made up numbers) in the exact same situation your ic wont be able to cool a 600 ic inlet temp to the same temp as it would a 500 Deg. Like I said I have logs of 3 lb/min gains (~30hp) when the inlet temp changed 60 deg. I Know obviously some of the cooling came from slightly cooler outside air adding to the ic's efficiency. I'm not saying you will gain 30 hp just by going to a CAI but Iam saying it is worth doing and you will gain more then 1 hp as the origional post had stated.

Do I think a CAI will make as big of a difference as a fmic, noway. Will a CAI be as effective on a turbo car compared to a NA, probably not. I think for the price/hp gain, its defently worth it. There must be a reason that pretty much all drag cars you see have one NA or turbo.

FWIW, this spring I will be adding ducting where the factory smic pipeing went to direct outside air into the intake & will also be blocking the filter off from the engine compartment. I will make sure to do a log before & after under the exact same conditions so we will know the real effects of outside air vs engine bay temps.

 

[alex99gst]

Please read post 12 if you still doubt the effectiveness of a cold air intake. The link has logs before and after cold air intake.

 

[TURFNNSURF]

Surfnnturf, you're venting a stock 1G CBV... normally I'd warn you about sucking in unmetered air, but I see your blowthrough setup. However, you're still sucking in unFILTERED air. The 1G 'bov' is not a BOV. It is a CBV. The difference is that a CBV is not only open to vent pressure, but is also open under vacuum (idle, light driving and decel). I'd recommend gettinga proper BOV if you are going to vent.

Talesin,

Are you talking about a 1g BOV from real world experience, or are your claims from reading info on the internet? Maybe you had a shitty 1G BOV that leaked or had a weak spring in it. I ran my 1g BOV vented in a Blow Through setup for over a year, it NEVER leaked at idle and my car holds 18 to 21 inHg, or at cruise when my vacuum was even lower. It only released when I was letting off after any boost from 2 to 18psi. After I installed my 50 trim, I had to cruch my 1g BOV to help it hold past 23psi but it still NEVER leaked under normal idle and vacuum conditions.

AS of right now since im tuning for 25+psi daily driving with H2O injection, I am running a Tial BOV with 11lb spring, It doesn't leak at idle or at cruise and blows off nicely after boosting.

 

[MilwaukeeGSX]

is anyone going to answer his question or just keep talking about 1st gen bov? i also would like to know

 

[tstkl]

have you thought about making a box and having a dump tube? allow me to elaborate:

click, here
http://vfaq.com/mods/1G_cold_air_box.html

what im going to do is get a peice of sheet metal and curve it kinda so that it causes all the air going through that hole (and have it a little lower than the car so that some air from under the car) will be directed towards that hole, which I will enlarge. then ill put some walls, but no roof, around my air filter. you could also cut a hole in your headlight,

my wall will look something like this, except my maf is on my uicp so it will just be a round hole

http://www.getboost.com/ray/Web Pages/intake-exhaustmods.htm

 

[91-gsx]

hey guys,
i am the one who took that log once upon a time, and now that i think of it when it was raining and i would build boost the car would bog a little bit, just like it had water injection or something. anyway, the cold air intake i made was a i believe ~36" straight piece of 2.5" tubing from home depot along with one coupler to the turbo and on the other end i had the k&n filter. at the time you could see between one log and the other my trims would change so i never knew why the car was doing this. till now. the people who read that thread did not believe that i made no changes whatsoever to the tune but just to the tubing and cold air intake. first of all the cold air intake has the great benefit of cooling off anything that might have been heatsoaked from a previous pull. the intake tube was always cold. the exiting tube from the turbo was warm and the tube right after the intercooler was cool. i gained both better gas mileage and a difference that you could feel, not just log. plus it took my knock count way down and i could actually tune more aggressively. overall it was one of the best mods that i have done, for those nonbelievers, i dont think that you are nonbelievers as much as you are too lazy to try this out....
later

 

[alex99gst]

I have decided to go with the intake in the same spot, but possibly build a box around it. I am definately going to do what wret did with creating ducting to go from the left bumper hole and use some flex tubing to make it shoot it into the intake. I'm sure this with a box would provide huge improvements. Thanks for all your help guys. I'll try to get pics up of it when I'm done, but my front mount was just shipped out today, so it may be a little while. My friends want to watch/help witht he install to get some experience.

I have previous logs from the supra sidemount and I will compare those with the logs from the new setup and post them up as well.