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M35 Turbo Suction Pipe

scotty nm35

By scotty nm35,
in Four Door Family & Wagoneers

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scotty nm35 Grand Master

scotty nm35

Posted
Posted

I pulled the intake off today and tried to imagine how I am going to fab a new suction pipe for the turbo. Its very tight in there and the bolts will be a bugger to get to but its definitely possible to enlarge it. I think this is the major bottleneck of the intake causing the lower than expected output. While there I will enlarge the AFM to reduce the voltage getting to the ECU. Hopefully this will allow full airflow measurement without clamping the voltage.

At least part of the pipe has to be silicone for engine movement so I guess theres not much to make really. I just wish I had a spare engine to work with, I dont like stripping mine all the time. Anybody have a VQ25det laying around? ;)

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https://www.sau.com.au/forums/topic/290147-m35-turbo-suction-pipe/
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andy65b Veteran

andy65b

Posted
Posted
I pulled the intake off today and tried to imagine how I am going to fab a new suction pipe for the turbo. Its very tight in there and the bolts will be a bugger to get to but its definitely possible to enlarge it. I think this is the major bottleneck of the intake causing the lower than expected output. While there I will enlarge the AFM to reduce the voltage getting to the ECU. Hopefully this will allow full airflow measurement without clamping the voltage.

At least part of the pipe has to be silicone for engine movement so I guess theres not much to make really. I just wish I had a spare engine to work with, I dont like stripping mine all the time. Anybody have a VQ25det laying around? ;)

There is a the damaged M35 at Pickles for sale. You can buy that then part it out. Apparently only expecting 4-5k. LOL

Cheers

Andy

scotty nm35 Grand Master

scotty nm35

Posted
  • Author
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Can you wait until the end of the month/start of next month Scotty?

Have something in the works... ay Iain?

Are you holding back on me? And I thought we were mates...

What are you planning???

Sneaky bugger. ;)

  • 2 weeks later...
scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted

Finally finished. What a bugger of a job to make.

I had to fit and refit about 30 times, and its not fun to get in there.

I have to tune now, I may end up buying a wideband and gauge as dyno tunes are just too expensive.

post-63525-1255673231_thumb.jpg

post-63525-1255673265_thumb.jpg

scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted

The price will be right, I just have to sort out a small airflow sensor issue.

The car is idling very low, like 550 to 600, which is nice but occasionally it stalls pulling up to an intersection. Im guessing it could be tuned out but some of you cant so I would like it to work on a standard car and have the air fuel ratio checked before I can be sure theyre ok.

The turbo flange has a nice funnel from 58mm out to 70mm id for the rest (3inch pipe.) I will also have to insulate them with exhaust wrap as mine is only 10mm from the ex manifold. Its a tight fit, no going bigger thats for sure.

post-63525-1255770836_thumb.jpg

iamhe77 Grand Master

iamhe77

Posted
Posted
The ECU seems to be sorting itself out. No stalling today. Hopefully just rotating the airflow sensor a bit did the trick.

Definitely heaps more go but it still needs a tune.

Yeah. I could actually feel the power this time instead of just watching the speedo go crazy :P

  • 1 month later...
StageaM35 Explorer

StageaM35

Posted
Posted
The turbo flange has a nice funnel from 58mm out to 70mm id for the rest (3inch pipe.) I will also have to insulate them with exhaust wrap as mine is only 10mm from the ex manifold. Its a tight fit, no going bigger thats for sure.

Is the turbo inlet flange something you can buy off the shelf or do you make it yourself? I know the exhaust flange is a T3. The opening size of the inlet is about 58mm for your turbo? Would be a bit smaller on a standard turbo? Not much room to allow for the bolts to fit through the holes once a seam is welded around the pipe to the flange.

Is it hard to unbolt the standard suction pipe from the turbo? Can't even see the bottom one :) .

Cheers for all your info :)

Rhys

scotty nm35 Grand Master

scotty nm35

Posted
  • Author
Posted

Not much room for anything down there... especially 3 inch pipe. Every part is custom, the turbo flange and funnel are from one piece of alloy, 100mm round by 50mm then machined on the lathe. it has to be 50mm to clear the stud (but the nut still has to be installed first or you cant get it on.) and the nut is done from underneath. PITA.

Standard turbo inlet would be 48mm or so I think

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