Cold Air Intake vs. Intake
01-22-2009, 07:20 PM
#51
Asshole for hire
iTrader: (1)
Join Date: Jun 2006
Location: Colfontaine, Belgium
Posts: 3,214
Likes: 0
Received 3 Likes
on
3 Posts
injen says you gain 21hp, but if you look at the dyno chart and max power, you gain 11 roughly, dont get me wrong its great as far as this car goes, but thats only just the intake, if you get an exhaust, headers and everything else to make the car breathe easier....you might see 21+.
-yes the average street car can see +20whp gains, but not w/o tuning
i talked to a mazda tech at modernmotors who used to race 3rd gen rx7's and he said he used ram air because of the way the rotary is and the faster you go...the more air gets into your intake and into your engine at those higher rpms which makes your engine feel like you have a bit more power at the high rpm
-the type of "RAM AIR" you describe also isnt special on a rotary engine, it is what it is on any engine.
-i dont care to argue terminology or anything, but if what you describe above is "RAM AIR" - then the closest thing to a "ram air" intake for the RX-8 is the Racing Beat duct. thats the only one...
-all the others are CAI, or short ram(aka sucking heat directly out of the engine bay)
i thought cai's went to the bottom of the engine bay to pick up the cooler heavier air near the road, i think they call the racing beat set up an cold air box where its kinda best of both worlds, but tahts what i was always told and thought unless im not being told something, id love to know, itd help me out.
01-22-2009, 10:12 PM
#53
Asshole for hire
iTrader: (1)
Join Date: Jun 2006
Location: Colfontaine, Belgium
Posts: 3,214
Likes: 0
Received 3 Likes
on
3 Posts
what your saying is true, but the difference in height your talking about doesnt make a difference. also, just to throw you for an OT loop. how warm do you think it is at 30,000ft?
01-23-2009, 02:33 AM
#54
Registered User
Join Date: Jul 2006
Location: Port Hueneme, Ca
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
https://www.rx8club.com/showthread.p...iy+intake+duct
do this mod, and then goto pepboys,autozone,whatever store sells air ducts,and use that for airflow to ur intake..can't remember what thread that was with the air duct,but its cheap,and u don't have to spend $100's on a air duct from RB,not saying anything bad about RB products,just a cheaper route thats all
do this mod, and then goto pepboys,autozone,whatever store sells air ducts,and use that for airflow to ur intake..can't remember what thread that was with the air duct,but its cheap,and u don't have to spend $100's on a air duct from RB,not saying anything bad about RB products,just a cheaper route thats all
01-23-2009, 09:21 AM
#55
Registered
Actually on really hot days, the radiant heat from the road can cause air temps to be much hotter right above street level than even another foot above it.
Ram air does work. However, it's benefits aren't even beginning to be realized until high speeds. Realistically there's no usable benefit of it until around 100 mph or so. Generally that neighborhood somewhere. Maybe a little more maybe a little less. Above that speed, the pressure starts increasing at a faster and faster rate and each mph faster you get going gets a greater and greater benefit than the one before it. Racing Beat used true ram air on the naturally aspirated Bonneville 1st gen RX-7 back in 1978. That car set the top speed record for that class at around 184 mph. Ram air was responsible for 3 mph on the top end so basically without it they'd have going 181 mph. Keep in mind the horsepower benefit is much greater up there than at freeway speeds or any street legal speeds. The downside to gaining more power from ram air is that your drag is going up at a nearly proportionate rate. Only slightly less.
Ram air does work. However, it's benefits aren't even beginning to be realized until high speeds. Realistically there's no usable benefit of it until around 100 mph or so. Generally that neighborhood somewhere. Maybe a little more maybe a little less. Above that speed, the pressure starts increasing at a faster and faster rate and each mph faster you get going gets a greater and greater benefit than the one before it. Racing Beat used true ram air on the naturally aspirated Bonneville 1st gen RX-7 back in 1978. That car set the top speed record for that class at around 184 mph. Ram air was responsible for 3 mph on the top end so basically without it they'd have going 181 mph. Keep in mind the horsepower benefit is much greater up there than at freeway speeds or any street legal speeds. The downside to gaining more power from ram air is that your drag is going up at a nearly proportionate rate. Only slightly less.
01-23-2009, 12:17 PM
#61
Registered
iTrader: (1)
Join Date: Jul 2008
Location: Bethlehem, CT
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
i just drove it like normal, i was on route 8 i live in ct, and i was in 4th at75, then 5th until i think 100, tehn 6th and i kept going utnil i got to 130, i had a friend in the car and he told me to push it, so i did, i didnt add any mods other than my sway bars and brakes, it was all stock
01-23-2009, 12:19 PM
#62
Registered
iTrader: (1)
Join Date: Jul 2008
Location: Bethlehem, CT
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
rotarygod....when you said speedsource was running rx8s with 230 whp what was their set up in their cars?? or do you have a site or something that'll give some info cuz i really want to know.
01-23-2009, 12:23 PM
#63
Asshole for hire
iTrader: (1)
Join Date: Jun 2006
Location: Colfontaine, Belgium
Posts: 3,214
Likes: 0
Received 3 Likes
on
3 Posts
custom exhaust, OEM intake, stand alone engine management. maybe A/C delete + pullies?
maybe RG knows exactly what your looking for but the thing is, making 230 isnt primarily a matter of knowing what parts to bolt up. you'll never get close to that with any parts unless you have a good tuner
maybe RG knows exactly what your looking for but the thing is, making 230 isnt primarily a matter of knowing what parts to bolt up. you'll never get close to that with any parts unless you have a good tuner
01-23-2009, 01:36 PM
#64
Registered
custom exhaust, OEM intake, stand alone engine management. maybe A/C delete + pullies?
maybe RG knows exactly what your looking for but the thing is, making 230 isnt primarily a matter of knowing what parts to bolt up. you'll never get close to that with any parts unless you have a good tuner
maybe RG knows exactly what your looking for but the thing is, making 230 isnt primarily a matter of knowing what parts to bolt up. you'll never get close to that with any parts unless you have a good tuner
No info on a website anywhere. They were at Sevenstock the past couple of years. You just had to chat with them personally.
01-24-2009, 10:39 AM
#73
Asshole for hire
iTrader: (1)
Join Date: Jun 2006
Location: Colfontaine, Belgium
Posts: 3,214
Likes: 0
Received 3 Likes
on
3 Posts
i dont know who if any have deleted the A/C, i think TeamRX8 may have for a while? I dont know that Team had one of the most extensively R&D'd and custom fabbed NA setups of any member here(he has now changed to OEM i think). with all of the mods he did and some very good tuning he put down 220whp IIRC...
01-24-2009, 11:57 AM
#74
Registered
iTrader: (1)
Join Date: Jul 2008
Location: Bethlehem, CT
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
thats very decent for the car, its just kinda sad how tuning wont change that much on the rx8. whats IIRC? and also, i dont want to put in a turbo just because i dont want to risk over boosting it, i usually dont hold back once i throw a turbo onto anything
