kpr Posted August 27, 2020 Author Share Posted August 27, 2020 Nice. Do you think there are any other benefits from the airbox other than the drop in iat's? Quote Link to comment Share on other sites More sharing options...
Celica RA45 Posted August 27, 2020 Share Posted August 27, 2020 yeah i picked up more power and torque Quote Link to comment Share on other sites More sharing options...
Yowzer Posted August 27, 2020 Share Posted August 27, 2020 Would that simply be a result of the lower IATs, or something else? 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted August 28, 2020 Author Share Posted August 28, 2020 I just finished testing that abortion that i built. Its roughly 9-10L Best i could get it to work was with a 4" hole and no intake pipe. although with the pipes there wasn't much difference. It changed the power curve a bit. vs the open throttles. just traded power here and there rather than one beating the other over all. So in my case at least, the airbox can match the open throttles but no better. Kinda limited testing. but conclusion I've come to so far, Is the airbox needs to be big as possible along with feed pipe. and is basically used to direct cold air, which is where the gains are , rather than the box doing anything fancy itself red - airbox with 4" hole blue - open throttles both above identical trumpets green is the plenum off the hilux. which i though did pretty good. considering how the last one performed na 1 1 Quote Link to comment Share on other sites More sharing options...
mjrstar Posted August 28, 2020 Share Posted August 28, 2020 Pretty sure airbox (maybe wheelie bin) on the end of trumpets ( I'm thinking those road cones you threw into the paddock) should net around 200kw.. This has been cool to watch / read, and the road cones showed real potential but then fell very sharply. I was sure they were going to punch a new all time high number.. 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted August 28, 2020 Share Posted August 28, 2020 that's actually quite amazing that theres a solid ~1200rpm where you get a fair smidge more power from it. As in, I wonder if changing the volume or whatever of the plenum could end up with that bump further up and stack it on top of your existing peak. Very interesting that the pipe off the front made no positive difference! Maybe it has more of an effect when the plenum volume is very small. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted August 28, 2020 Share Posted August 28, 2020 Can you get a 6" hole into the plenum? 4" is too small. Quote Link to comment Share on other sites More sharing options...
Celica RA45 Posted August 28, 2020 Share Posted August 28, 2020 yeah 4 inch is 2 small .yowzer with colder air temps going in more fuel and ign timming gave more hp Quote Link to comment Share on other sites More sharing options...
Celica RA45 Posted August 28, 2020 Share Posted August 28, 2020 kpr was your air intake running in colder air also were you using your map inside to see if it was holding the air back from entering your new air box on ram tubes i try to have then 60mm away from any part of the air box lid Quote Link to comment Share on other sites More sharing options...
kpr Posted August 28, 2020 Author Share Posted August 28, 2020 Thought the inlet size would be brought up. Way i see it, once the inlet pipe is that big, its just a way to direct cold air rather than some kind of intake tuning. We already know cold air makes more power so isn't really relevant. There wasn't much difference in the 3" hole vs the 4" hole. red 3" hole blue 4" hole small difference in favor of 4" hole. but could almost go down to slightly different temps rather than a gain to 4" hole. But even giving the couple of kw gain to the 4" hole. would be diminishing returns going even bigger 1 hour ago, Roman said: that's actually quite amazing that theres a solid ~1200rpm where you get a fair smidge more power from it. As in, I wonder if changing the volume or whatever of the plenum could end up with that bump further up and stack it on top of your existing peak. Very interesting that the pipe off the front made no positive difference! Maybe it has more of an effect when the plenum volume is very small. Could probably move that bump at 7500 up the rev range a bit. but would likely drag the dips up with it as well. So to me looks like would end up with the same power curve as the open throttles. below is the same chart but the green hilux inlet run removed. so can see the difference more clearly. can see how it just trades power 2 Quote Link to comment Share on other sites More sharing options...
kpr Posted August 28, 2020 Author Share Posted August 28, 2020 59 minutes ago, Celica RA45 said: kpr was your air intake running in colder air also were you using your map inside to see if it was holding the air back from entering your new air box on ram tubes i try to have then 60mm away from any part of the air box lid In the tests everything would be close to the same ambient temps. bonnet open. and dyno fan blowing fresh air in. I dont have a radiator in front of the inlet. so temps aren't an issue with the open throttles soon as car is moving on road. but as i said in previous post the air temps aren't what im chasing in these tests 1 Quote Link to comment Share on other sites More sharing options...
Celica RA45 Posted August 28, 2020 Share Posted August 28, 2020 ok fair enough, i use to use a 100mm dia tube going into my air box at the race track ,we put the map sensor into the side to check the air volume so at idle etc was on 100 at 50 percent throttle was 95 at 100 percent throttle is went down to 80 ,i then put a 6inch hole into my air box and the map sensor stays at 100 from idle all the way to 9200 redline Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted August 31, 2020 Share Posted August 31, 2020 Bit of a linger, But a bloke in aussie sells an airbox to put in triple 48mm weber's on a 265 hemi. They add something like 16 horsepower just from the colder air Quote Link to comment Share on other sites More sharing options...
kpr Posted August 31, 2020 Author Share Posted August 31, 2020 Yep, seems the moral of the story is get cold air in there in some how, air box or no airbox. Maybe something in the airbox itself, but probably very little. We at least know needs to be big as possible to pose no restriction my junk will easy make an extra 5kw on a cold day vs a warm day. with the dyno correction turned off 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted August 31, 2020 Share Posted August 31, 2020 I've got a new scheme I might print for you to try. Basically a runner with a smaller inner entrance but then a chamber area around the perimeter to see if you can amplify a reflected wave back down with minimal energy loss / max doorts 4 Quote Link to comment Share on other sites More sharing options...
Celica RA45 Posted August 31, 2020 Share Posted August 31, 2020 also have a look at the superbikes ram tube set ups a ramtube in a ram tube 2 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted September 1, 2020 Share Posted September 1, 2020 10 hours ago, Roman said: I've got a new scheme I might print for you to try. Basically a runner with a smaller inner entrance but then a chamber area around the perimeter to see if you can amplify a reflected wave back down with minimal energy loss / max doorts The people who design this stuff for a living are mathematicians/scientists/wizards/witch doctors. But the "guys at home" like yourself who dream up stuff like this will on a good day put the aforementioned group to shame. I look forward to the results! 2 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted September 1, 2020 Share Posted September 1, 2020 Youd need clean air separation where the internal trumpet terminates though. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted September 1, 2020 Share Posted September 1, 2020 5 hours ago, Celica RA45 said: also have a look at the superbikes ram tube set ups a ramtube in a ram tube Do you have any links to pics of these? I'm keen to see, but my google searches didn't bring up any photos. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 1, 2020 Share Posted September 1, 2020 Bunch of motogp bikes have variable inlet runners from a quick google if thats it? looks pretty much exactly like the old F1 ones before it was canned. As we said somewhere they have small rev range and high rpm so don't have to move far. (pic is road bike promo version I think, the might be just two step to lazy to look) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.