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ITB airbox design..
- Thread starter ScottRallye
- Start date
172 Cup Jenvey'd
I am thinking angled spacers are the way forward as I can get them machined up easy enough, just worried about the change of direction would mess up the airflow.
It's a Golf DTH setup Morgan. The trumpets are 120mm.
I don't, but you could work it out as the angle is 22.5°.
I asked Jenvey how much they space the trumpets out but they weren't much use.
Id bet its around 25mm in the lowest edge, I am away to order one to start with and try them before and after the SF body to see which fits best. It will save me trimming the bonnet with my 120's and give extra room and better flow too.
Im not sure what would have the least affect on flow, before or after?
That looks an ideal solution if it'll fit the Clio set up, would the bend not act like a venturi as the air speed would increase at the tight side of the bend, you would loose a bit at the top end power and gain torque lower down, or am I reading that wrong, it's not much of a compromise for me as I'd prefer more low down torque and loose a few BHP at the top, does depend on your application I suppose, thanks for posting the photo.
Regards Russ....
Regards Russ....
I don't think it'll make much difference if any.
NorthloopCup
ClioSport Moderator
I wouldn't worry too much about the change in direction for the airflow. It will make near as damn it no difference mate. Look at the original inlet - restrictive and a change of direction, yet still they make the numbers with a suitable cam/piston package.
Assuming they are the standard 50mm spacers but at an angle of 22.5° that makes the bottom part 30mm.
So with 60mm standard trumpets on the DTH kit you will end up with 110-90mm trumpets (100mm nominal). And you won't need to change the air filter. Assuming you have space of course.
So with 60mm standard trumpets on the DTH kit you will end up with 110-90mm trumpets (100mm nominal). And you won't need to change the air filter. Assuming you have space of course.
This is getting interesting, I'm stuck with trying to fit the package within the constraints of the OE slam panel and try to maintain a maximum runner length, I've been looking on the Jenvey site, if you fitted a Reverie air box and then a good quality remote filter ITG etc with a good cold air feed would this be much of a compromise, ideally for me I'd like to not have the filter up against the bonnet or slam panel and was looking at the possibility of the above as a solution, can I assume all of the above are running with out a slam panel?
I need to get a slim radiator and fans fitted 1st to see what space is available.
Regards Russ...
I need to get a slim radiator and fans fitted 1st to see what space is available.
Regards Russ...
172 Cup Jenvey'd
I do like the look of those spacers... Seems like the only way to go, il have to make a spacer at 22.5 degrees and see where that puts the trumpets before buying them. Whats the price on them as I cant find them in 45mm bore?
I'd be wary of airboxes. I ran a Pipercross airbox and it cost me 20bhp at the wheels.
RB 182
I've sent an email to Jenvey and will follow up with a phone call to Simon next week in regards to a bespoke angled spacer. I've been meaning to do this for a month but keep forgetting. As above, quite a few people see more losses with an airbox than running the standard foam filter. I'm looking to pack the filter as close as possible to the bumper. You can lower the alternator so this wont be an issue. The super 1600 clio ran a similar design with airbox, this was a bespoke manifold that angled back down and ran right up to the bumper. Will try and dig a picture out, they seem to be hard to fine 
172 Cup Jenvey'd
172 Cup Jenvey'd
I've sent an email to Jenvey and will follow up with a phone call to Simon next week in regards to a bespoke angled spacer. I've been meaning to do this for a month but keep forgetting. As above, quite a few people see more losses with an airbox than running the standard foam filter. I'm looking to pack the filter as close as possible to the bumper. You can lower the alternator so this wont be an issue. The super 1600 clio ran a similar design with airbox, this was a bespoke manifold that angled back down and ran right up to the bumper. Will try and dig a picture out, they seem to be hard to fine
Very interested to see a photo of that!
RB 182
Just noticed this wont bolt onto my ktec DTH kit
The hole spacing is the same though, 65mm. Just make an adapter if needed like in the photo I posted earlier.
Carbonraider
ClioSport Club Member
Raider, 172, the van
Just noticed this wont bolt onto my ktec DTH kit
Due to running the same kit and also having the same problems I looked at getting these:
http://www.jenvey.co.uk/home/access...ics/air-horn-45mm-x-110-40-curved-ah45x110x40
But now I'm thinking of cutting the flange off the dth's modifying the angle at which it sits at and re welding the flange back on there for il be able to fit a proper filter and longer air horns. Il let you know how I get on.
The only issue with those ones is needing a new airfilter. And after doing a couple of measurements they might even angle down too much.
I think the spacers are the best bet Tbh.
I've been on the reverie web site and they have quite a few air box options and Jenvey use their back plate and air box Zolder 112 as an option, expensive I know being carbon but they have GRP options as well.
So the air box and remote filter are not a good option or was there a problem with your set up Ph1Tom?
I notice that Meeks post shows a nice flowing curve to the inlet runners and a single plenum, I already have the 64mm single AT cable TB the S2000 unit.
www.reverie.ltd.uk
Regards Russ
So the air box and remote filter are not a good option or was there a problem with your set up Ph1Tom?
I notice that Meeks post shows a nice flowing curve to the inlet runners and a single plenum, I already have the 64mm single AT cable TB the S2000 unit.
www.reverie.ltd.uk
Regards Russ
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They are £25-00 each and they do a 40mm-45mm-48mm version it's under accessories.
I had this one. http://www.demon-tweeks.co.uk/Produ...al Air Boxes&gclid=CLGl2NTsnrsCFVMPtAodXUMA2w
I had the car setup without it, and then dyno run again with it on. It lost 20bhp at the wheels, so even more at the flywheel.
That does look shallow so will have to look for another solution judging by the comments, it must be down to the air box volume as I assume this is critical, too small and it kills flow/power
Noise isn't really a problem just the regs with respect to removing insignificant bits, most competitors I've asked don't see a problem with the slam panel removal as it's not structural but others do.
Regards Russ.....
It worked OK if I took the filter off. Even running it with no filter and the air feed pipe sapped power...strange.
There is quite a lot to it reading the info on Jenveys site and pulse tuning etc, how far the trumpets from the face of the box, I've sent an email to Revarie to see if they can give any info for a theoretical ideal set up for an engine, 8000rpm and Jenvey SF ITB's and 210-220 bhp output 55bhp per cylinder.
They have a lot of S2000 designed air boxes on the site using the single AT S2000 TB I currently have, and the plenums are all shapes but the cost is £690 etc:S.
Regards Russ.
172 Cup Jenvey'd
Oh I was looking at where they join with 4 bolt holes... Then noticed you only use the 2 to bolt it on like a standard trumpet. Thats ok then
It's not something rude...it's a rather shonky mockup of the DTH bodies with the SF spacers, 60mm trumpets and the recommended filter height.
Over Christmas I'll take my inlet and slam panel off and see what clearance there is. The recommended clearance for the filter is a minimum of 13mm for airflow.
Over Christmas I'll take my inlet and slam panel off and see what clearance there is. The recommended clearance for the filter is a minimum of 13mm for airflow.
I have to ask - though I'm probably going to get shot down in flames here.
Why are you all going to so much hassle to build airboxes?
Burpspeed tried one and lost like 10bhp, there's no heat soak issues with the Clio because the filter sits at the front of the engine any way.
If you're bothered about heat from the rad you could make a simple heat shield to sit above the radiator.
I'm really not convinced there is any benefit at all to the closed airbox types.
The one that OP is talking about building with a massive panel filter that sits up against the grill would be quite nice from a cold air point of view, but the rest are just a waste of time
Why are you all going to so much hassle to build airboxes?
Burpspeed tried one and lost like 10bhp, there's no heat soak issues with the Clio because the filter sits at the front of the engine any way.
If you're bothered about heat from the rad you could make a simple heat shield to sit above the radiator.
I'm really not convinced there is any benefit at all to the closed airbox types.
The one that OP is talking about building with a massive panel filter that sits up against the grill would be quite nice from a cold air point of view, but the rest are just a waste of time
Phil I agree with you, the odds of happening upon a setup that improves versus non airbox design is relatively unlikely.
It takes many evolutions and lots of testing to get anywhere with this sort of thing in motorsport, making something that looks similar is often not a way to duplicate the results, especially when you like mention the induction is so clean on a clio anyway.
But the OP may get lucky
Just put a heat reflective plate under the sausage filter between the rad and thats as good as you will get. You can spend hundreds on a airbox but you will gain nothing.
If the head was reversed like a Saxo 16v or an Corsa etc the yes but with it being at the front of and engine will direct airflow then not worth the time or effort.
If the head was reversed like a Saxo 16v or an Corsa etc the yes but with it being at the front of and engine will direct airflow then not worth the time or effort.
If he wants to make an open fronted airbox with a big rectangular filter then I think that will work just as well as the popular "sausage" filters - plus it will look a lot tidier and sound epic.
But the other airbox designs never work, you're always restricting the flow to a pipe or an opening which is daft.
I can see the need for them on cars where air flow is restricted like 106's/saxo's with inlets at the back, but you're really not short of cold air on a clio
But the other airbox designs never work, you're always restricting the flow to a pipe or an opening which is daft.
I can see the need for them on cars where air flow is restricted like 106's/saxo's with inlets at the back, but you're really not short of cold air on a clio
Only Russ is looking into a closed one. I'll keep the sausage. Scott is looking at the panel filter style.
172 Cup Jenvey'd
Checked out the 22.5 degree spacer on this set up. It brings the trumpets to near as damn it 90degrees off the floor which is nice! And theres about 15mm of room from the bonnet, il still have to cut the bonnet slightly to have the clearance that I'm happy with.
Is that 15mm between the trumpets and the bonnet or the filter and the bonnet?
