tsp
Chats A Lot
Posts: 439
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Post by tsp on Jan 10, 2018 16:43:39 GMT
Before I commit to having a manifold and spacer kit made for my ITBs I thought I’d ask the question about filters. Atlex made some interesting points about sausage filters vs an airbox but what about individual filters? My understanding is that an airbox is regarded as the best solution but I’m not sure of space and also the airbox is very expensive. I think I’m going to go with a sausage (ooh er) and as long as possible trumpets but I’d be interested to hear from someone who actually knows what they are talking about  |
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Post by atlex on Jan 10, 2018 18:24:01 GMT
So let me dump the thinking and messing I did around this subject. The advice I got for spacing trumpets and filters is to get a minimum of 15mm space around the mouth of the trumpet before the filter medium. That's meant to be enough to maintain the desired flow for the venturi effect. The difference with the sausage filter setup is getting a good backing plate - probably the best thing is to get a blank for the model of filter you want and make your own cuts... You can then offset it slightly for your install. Having done it... on the mx5 if you go beyond 50mm trumpets and use a sausage filter you get way too close to other things in the engine bay, on a RHD car. I was just within the limit for an ITG JC40-65. I'd have liked a JC85 or similar but couldn't find any. Don't think the JC100 would have fitted. MBC is too close... can be moved though.. Also the Clutch slave cylinder and inside of the filter housing needed a little modification so I could get it on past the trumpets. Here's the photo from the day I did that install.  Individual filters tend to be a bit more restrictive because they don't allow so much space "around" the trumpet. But you can avoid bringing the filter medium up to the lip, just give it as much gap as you can.. don't jam it all the way on. Plenty of cars making good power on individual filters. |
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tsp
Chats A Lot
Posts: 439
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Post by tsp on Jan 11, 2018 0:30:00 GMT
Thank you mate. I’ll have to have a few reads of that to let it sink in.
The danST manifold and fitting kit I think I’ll get set the bodies in line with the inlet ports, he also does a back plate for the filter to fit this set up. So I guess I’d get his Pipercross set up. It is £105 though. (Not saying he is overpriced, they go for this everywhere) The trumpets he offers look lovely too. To be fair all his stuff does.
Clearance as you say is obviously a bit of an issue. I think 45mm is about the limit of trumpet length you can go for.
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Post by baconsarnie on Jan 11, 2018 11:02:11 GMT
I managed to fit 90mm trumpets and appropriate sausage after relocating the brake bias valve... 90mm trumpets made more powerr everywhere than the 40mm supplied by jenvey... ^^
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tsp
Chats A Lot
Posts: 439
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Post by tsp on Jan 11, 2018 16:00:02 GMT
Thanks for the heads up mate. Although the more I read the less appealing the GSX-R throttle bodies look  I feel a help me with my life post coming on! |
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Post by FFS Corders on Jan 11, 2018 16:19:22 GMT
I have horneys old ae111 bodies and need to look into this kinda stuff...guve it another year and I might be in a position to worry about it all;)
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Post by atlex on Jan 11, 2018 17:17:58 GMT
the AE101/111 are the ultimate "engineered" solution to this problem .. what's there not to like ?  |
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Post by dadbif on Jan 11, 2018 19:49:47 GMT
Most important factor for ITB’s is matching the trumpet length to the TB to Maximise the power in the rev range you require, then get some filters to handle the trumpet length. I had to chop a hole in my Westfield bonnet, but I realise that is not an option on an MX5. This may help:- www.my-acoustic.com/Car/intake_exhaust/intake/intake2.htm |
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Post by dickie on Aug 25, 2019 15:27:18 GMT
Hi Folks, Just a refresh and new twist to this thread. I have a set of Danst GSXR ITBs with the PX500 filter, Its Very Loud !! I have just bought a junk filter off the Bay and intend to make a custom air box for it. My throttle cable is just in front of the filter I am using the standard cable on a custom bracket I will have to build the airbox inlet to miss it. I will be using GRP to make the custom box which should bring in cold air from the front of the car. It will be an odd shape to fit where its needed. |
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Post by Zed. on Aug 25, 2019 18:14:46 GMT
as a diferent shaped airbox idea.. when I'm in a position to actually bolt my gsxr/hayabusa itb setup on my car I'm hoping that theres enough room to fit a cf airbox I've had 'in stock' (think waiting for the right car!) hopefully the filter will live below the itb's as my car is a 1.6 so they are inclined not horizontal like on 1.8's  and can have some flexi-ducting to get cool air from the front of the car (& quieten the itb's 'bark')      the airbox was origonally made to fit 'split' 48mm Weber DCOE or Dellorto DHLA carburettors fitted to a Vauxhall 8valve 2Litre engine but didn't the car (mk2 Escort van, road-rally car) and the airbox clashed with the inner-wing so never used  luckily I happened to appear with a 'cheeky offer' and it's been in my garage for the past 15+ years gathering dust  will it fit Rich. |
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Post by dickie on Aug 25, 2019 19:04:41 GMT
This is early days not long after the ITB set was fitted. This is unmapped and not on a good basemap either.
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Post by dickie on May 30, 2020 16:49:34 GMT
![]() Hi Folks, I have started to make the mould for the Airbox to fix my Pipercross PX 500 baseplate. The mould will not have the air inlet pipe in it as I need to fit the box to the car then work out the best place for the intake pipe, I will then cut a hole in the airbox and glue the pipe in, this means I will have a generic mould which is about 90 mm deep, the airbox part can be cut to suit the available space, I might have to do some alterations to the shape once I have made the first part from the mould. I might make a plasticene infill to fit into the mould to enable the airbox to clear the OEM brake bias valve.
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Post by dadbif on May 30, 2020 21:33:23 GMT
Is there not an ITG sausage filter that will fit?
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Post by dickie on May 31, 2020 10:16:47 GMT
Hi dabif,
I already have a pipercross PX500 foam filter fitted. ( See link in earlier post on this thread )
I am building an air box with remote filter as a custom cold air intake to the ITB's
This will help with noise issues as well as engine efficency.
As there is nothing available for the PX500 baseplate I am making my own to suit the engine set up in my car.
The air intake hose will have to clear the throttle cable so it will come out of the upper side of the airbox.
The common PX600 air boxs are too long for my application.
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Post by dadbif on May 31, 2020 12:19:18 GMT
I did that on a 2.0 XE engine on 45 Dellortos, However I did it for different reason, so that I could use the original AFM and the Bosch ECU.
Fabbed it out of ally, got a picture somewhere..
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and can have some flexi-ducting to get cool air from the front of the car (& quieten the itb's 'bark')
luckily I happened to appear with a 'cheeky offer' and it's been in my garage for the past 15+ years gathering dust 
