free hit
counters
Turbo air intake pipe - replacement - Induction/Turbo/Chargecooler/Manifold/Exhaust - The Lotus Forums #ForTheOwners Jump to content


Turbo air intake pipe - replacement


Recommended Posts

Whilst playing around with the pipe work, refitting the electrics etc following the fitting of the new manifold I noticed that the air intake pipe for the turbo was looking a little tatty, also it looks like it has collapsed in a couple of places.

So, a new one me thinks, but replace with lotus part or a mod to improve air flow. The topic came up whilst talking with "changes" so would the air flow benefit from an aluminium tube of a larger diameter with some sort of reducer at the turbo end. This coupled with ram air could provide improved spool up.

Does anyone have any thoughts on what tube could be used and if anyone has done this mod, and results if possible.

Dave

Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.

Dermot even reduced the gauge of the wire in the ear to increase airflow! All adds up :)

 

http://users.ox.ac.uk/~ohare/ancillaries.htm#h1

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

I wouldnt of thought a solid tube and a diameter reducer at theturbo end would flow well. A sudden change in the diameter would create a bottle neck and mess with the flow. A gradual change.as per original is good, obviously its ribbing allows it to curve around the rear of the engine and allows essential flexibility in the pipe as the engine moves independent from the body where the airbox is attached

Link to comment
Share on other sites

I don't think the cost is too bad if they are still around £90 from SJ? It will last circa 20 years and I have seen many spend close to that on silicone and alloy tube only to lose the flexibility of the original as Darren points out, not to mention originality.

Trevor.

I'll get around to it at some point.

Link to comment
Share on other sites

For the first time I noticed the mesh in the air intake, 40% reduction looks about right. I assume it's to stop small children and furry animals being sucked in.

Need to fit bigger mesh, ram air and a new pipe me thinks.

Dave

Link to comment
Share on other sites

:lol:

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

Off topic  :huh: ................................................... :bounce:

Caught between a rock and a hard place in a catch 22 situation, So its 6 of one and half a dozen of the other. Your damned if you do, but your damned if you don't so shut your cock!!!!!!!!!!!

Lotus Espirt Turbo S3    

Lotus Esprit S4 

Lotus Elise S2 Sport 130

pig_zps6d7342f1.jpg

Link to comment
Share on other sites

Right spoke to my mate last night he is a power train engineer for a certain blue badge car maker, he also worked at Lotus. He designs engines for a living, and I mean the whole engine not just tuning stuff up. He said the taper on the hose does bugger all, it's probably just a case of lotus bought the airboxes off someone else. You could use a non tapered hose if you wanted to change the end on the airbox. It has nothing to do with air pressure drops etc.. The turbo is the important bit as that has to have a certain size diameter for the compressor. 

 

If you want to taper they work on a theory of reducing by a 5th on the straight run after that it does nothing. It's how quick it can dump the air out that affects the spool time. Increasing the airflow does sod all on a turbo engine as it is Forced induction. i.e it pulls through what it needs. Yes CAI will bring in cooler air but the turbo will heat it up, that's why you have an intercooler on the SE onwards. 

 

N/A is different I had a Honda VTEC that had cold induction and you could feel that as it forced more air in, plus it was set in the bumper well away from the engine heat, so it would drag in colder dense air.

 

Hope this helps

Amateurs built the Ark

Professionals built the Titanic

"I haven't ridden in cars pulled by cows before" "Bullocks, Mr.Belcher" "No, I haven't, honestly"

Link to comment
Share on other sites

Good post Chris, interesting stuff. I think the air box end is larger than the turbo end, so a reducer at the air box end would work.

I agree that it's all about the pull of the turbine, but the air has a long way to go and if the air does not move freely then it must inhibite the spool up time.

The trouble with all ths playing around is that you never know if it's better or worse than before the change. I know it's not scientific but is there an app which would provide a G value ie an average g force over a predetermined road / distanced travelled. This would perhaps show any g change, higher the g the greater the acceleration.

Anyone any thoughts.

Link to comment
Share on other sites

Ditch the original airbox and tubing. The air has to travel a long routed way from ouside of the car to the turbo. Inlarge the entry hole at the rear window, run a silicone pipe to an inline viper airbox and then straight into the turbo. I have done this on my S4s, way better than the standard setup. You will have to move the coolant expansion tank to where the original airbox is, and by doing this it shortens some of the coolant pipe runs as well.

 

cheers

Dave

Link to comment
Share on other sites

Did you look at the link I posted above, there's tonnes of info about better induction there.

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

This is what i did and detailed in the 412 thread... based on Dermot's and 

then i took to the next level...

It all makes a big difference as part of a package .

NB. the less the compressor has to scavenge on induction the better the

spool up will be.. with an effective ram air the pull load is negligible.

 

Link to comment
Share on other sites

I used something similar to this type of airbox http://www.ebay.co.uk/itm/UNIVERSAL-RACING-CARBON-FIBRE-ENCLOSED-HIGH-FLOW-COLD-AIR-INDUCTION-KIT-FILTER-/350780840504?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item51ac2ada38#ht_1034wt_958

 

 

using alloy pipe work and silicone joining hoses. I am running a larger pipe than standard because I have a T4 cosworth housing on the compressor side of my turbo.

Link to comment
Share on other sites

Does anyone know what diameter the hose is at each end?

 

Thanks

Amateurs built the Ark

Professionals built the Titanic

"I haven't ridden in cars pulled by cows before" "Bullocks, Mr.Belcher" "No, I haven't, honestly"

Link to comment
Share on other sites

Oddly enough, I've just replaced the standard hose with various bits on my 88 carb turbo:

 

76mm to 60mm silicone reducing hose (the 60mm fits the turbo)

About 50mm of 76mm alloy tubing

Flexible neoprene hose 76mm diameter to the airbox

Another 50mm of 76mm alloy tubing

Then a rubber collar I had from an earlier project which held the alloy tube and wrapped around the airbox outlet, which I couldn't measure very easily but is I think 80mm.

 

Looks convoluted but I'm happy enough.  The alloy tubing is just to give the hose clips something to grip to.

 

Can't honestly say I've noticed a difference one way or the other, but if you do go straight out from the turbo (ie in line with the turbo inlet) be careful to leave space for the back of the boot floor panel.  I had mine out when I did it and now it's back in there's a bit of contact.

Link to comment
Share on other sites

Will the neoprene hose not just collapse under vacuum?

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

It's a reinforced one with a metal spiral through it; similar to the original.  Having driven around a bit more, it seems to be making an interesting noise to accompany the dump valve.  Like an angry bear some distance away...

Link to comment
Share on other sites

:thumbup:

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

Link to comment
Share on other sites

It's a reinforced one with a metal spiral through it; similar to the original.  Having driven around a bit more, it seems to be making an interesting noise to accompany the dump valve.  Like an angry bear some distance away...

 

What, like a koala bear?

 

All we know is that when they stop making this, we will be properly, properly sad.Jeremy Clarkson on the Esprit.

Opinions are like armpits. Everyone has them, some just stink more than others.

For forum issues, please contact one of us Moderators.

Link to comment
Share on other sites

  • 7 years later...
  • Gold FFM
On 07/05/2013 at 20:11, Neil Potter said:

It's a reinforced one with a metal spiral through it; similar to the original.  Having driven around a bit more, it seems to be making an interesting noise to accompany the dump valve.  Like an angry bear some distance away...

@Neil Potter, how did the Neoprene ducting work out? Did it ever deform due to -ve pressure or heat?

I've just ordered 1m of this stuff: https://www.viperperformance.co.uk/silicone-hoses_10072_neoprene-ductingcold-air-feed.html

and one of these reducers: https://www.viperperformance.co.uk/silicone-hoses_9856_straight-reducerssilicone-hose.html

as the existing original ducting is very tatty and has some small tears in it.

Link to comment
Share on other sites

Hi Robin,

That tube and the reducer look very like mine. The neoprene has held up well, doesn’t seem to deform. I found one small tear in it a couple of years back and gaffer taped it, looked at it again this year and couldn’t find any more.  

And either it stopped sounding like a bear or it’s become normal to me!

  • Like 1
Link to comment
Share on other sites

  • Gold FFM

Fitted mine today. The 80mm neoprene duct was a bugger to fit on the air filter box, but on it went. The wire is really strong, should be no problem with -ve pressure suction. Was going to cover in foil tape, but didn't bother in the end. Will just keep an eye out for rubbing and chaffing on the boot wall in the future.  

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...