urgent info required

[catboy]

if i fit an induction kit (s/s tubing, custom air-box and cone-filter) and front mount intercooler (also custom job; s/s tubing, large alloy front mount, silicon hose, etc) do I need to make any provision for the air pump?...

I dont know much about this, but understand that removing it will cause problems... ...does this plumb into the inlet, the air tract from the air-box, the intercooler, the fuel rail?...

Hope someone can help
b:)

[bnaellis]

I don't fully understand your question, but the only provision you need to make with that you have stated is that the pipes from interooler are routed around the airpump. Or do you mean you want to remove the airpump ??
Your main provision should be for enough fuel being added to the mixture, do you havea aftermarket ecu already ???


rgds

Brian

[Fish]

Catboy, you wont just need to worry about the air pump! You will also need to look at the fuelling.

What RX-7 do you drive? If it's an FD does it still have the CAT's?

The air pump is only used for pushing air through the CAT's at low RPM. Below 3000 RPM I believe.

Dan

[catboy]

I have a 1989 turbo 2, and its fitted with a cat-less exhaust system. I am not bothered either way about removing the airpump, but I have heard the following

1) removing creates idling issues/running issues below 3000rpm
2) if an air pump is fitted and siezes, the engine will cook v.quickly (same belt as the water pump?)

if #1 is true, I will leave in place, if not, then I will remove it and get the apropriate pulley/belt kit (1 less thing to go wrong :rolleyes: )

I have an alloy intercooler from work, and since I work with tube and hose suppliers all day, was going to use it as a front mount (its about 20" x 10" x 3") and get some thin wall s/s tubes made up on the cheap to route thro' the engine bay... ...my main issue was whether I needed a port in the system somewhere to connect the air pump up to (be it at the inlet or outlet of the intercooler, between air-box and turbo, etc., etc....)

I understand the function of the air pump is to get more hot air into the cat to help burn off un-burnt fuel, keep the cat temp. up and prevent it from fouling (from the over-fueling at low rpm). What I wasnt sure of was where it connected; does the air pump connect to the inlet side of the engine (if so where) or does it pump air around the exhaust manifold through an outer skin and into the cat/exhaust directly?... ....if so I have no cat, so dont think its doing anything!...

I also wanted to know if there were any air flow sensors other than the main one (between air box and turbo I think) in the inlet system, as I have a blitz cone filter, and was going to plumb it in using some s/s tubing at the same time... ...dont want to remove any sensors, but will make provisions in the new system for re-fitting them

Sorry for the crap frst post; I was typing in a hurry in my lunch break!...
Also, sorry if the questions seem dumb; I am fairly new to the rotary thing, and havent been able to find much on the net re: air pumps and their instalation/removal

b :)

PS... std ECU at the moment :eek:

[Fish]

Catboy, right as you dont have CAT's yes it can be removed. You might need to make up some blanking plates. Also you might need some new pulleys. Geff at ReWorx sahould be able to help on this front.

Not sure how it connects on an FC. Where's Clive when you need him.

The intercooler might be a little big (i.e. laggy) unless you have a bigger turbo to drive it. Working out the correct sizing for the pipe work will be fun. Remember smaller from the turbo to the intercooler, then larger from the intercooler to the inlet manifold. Also dont forget to make an outlet for the dump valve.

Air flow sensors. There is one on the underside of the inlet manifold on the FD, not sure where it would be located on an FC. But being a turbo I am sure that you would have one to control the boost.

There are no such things as dumb questions, just unlearnt knowledge. :D

Dan

[catboy]

I design hydraulic and pneumatic systems for a living, so hopefully the air-flow calcs should be fairly run-of-the-mill for me :)

The intercooler is not massive, and acctually sits a treat beheind the centre opening under the bumper/numberplate... ...I am planning on fitting it so it sits upright (rather than slanted like the rad) so as to allow air to flow in beheind it for the radiator

I think I should be able to get all the sensors to carry across, and will make fittings/tee's for the dump-valve etc... ...might even replace it with an aftermarket one at the same time

Thanks for the information; I think I will work on removing the airpump first, then move onto the inlet/intercooler/dump-valve project!

b :)

[Fish]

Whilst your making the intercooler stand up so to speak, why not do the same with the rad?

Dan

[catboy]

I was assuming the rad is slanted so you can get a bigger one in the shallow nose of the car?... I underfstand its only going to have the same effective area as a smaller one with the same frontal area (ie viewed from the front, parallel to the road) but dont know how this is going to effect the cooling system...

...let me know, as I might be interested in doing this at the same time...

b :)

[MikeLMR]

I've read some design books on race/rally car design and I think the radiators are sloped for a reason

1. You can get a larger radiator into a car with a small frontal area

2. at high speeds the air is moving so quickly it spends very little time in contact with the surface of the radiator, having a sloped core slows the air down and can help with the transfer of heat from the radiator to the air.

3. I think there may be a benafit to the air hitting the fin at an angle as it prevents a turbulant layer of air sitting on the fin surface preventing proper heat transfer

sorry I'm not very good at explaining these things + its a bit of knowledge I've picked up at college and work and in books all mixed together !

Anyone want to comment ? I'm sure I've got the wrong end of the stick at least once :yes

Mike " I've gone Cross eyed" Mckenna !