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Rb25det Exhaust Manifold Install - How Difficult?

vault13

By vault13,
in Engines & Forced Induction

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vault13 Enthusiast

vault13

Posted
Posted (edited)

Hi guys

I'm reinstalling a turbo back exhaust this week and was wondering how difficult it would be to fit an aftermarket exhaust manifold?

I have no idea of the time/difficulty and will be paying workshop time while assisting, so any suggestions would be helpful.

I suppose I should also ask whether its worth doing in the first place?

Thanks in advance.

Edited by vault13
bluey33 Experienced

bluey33

Posted
Posted

It would be worth doing if it has to be done. You dont have to do it but if you do you know it will last a lot longer then the current one. It isn't hard to do but if you have no idea how to do it get a mate that may know and if not then it would most likely be best to get a workshop to do it... You also have to watch for if you snap and bolt heads off the dump pipe, If you do you will probably wish you had of taken it to a workshop because there is a bit of ass farting around if you do manage to snap a bolt.

Hardman69 Collaborator

Hardman69

Posted
Posted

I just put a low-mount stainless one on.

There's a week of evenings gone.. . . . :D

Seriously thoughtless design, I couldn't get a proper go at torquing 2 of the nuts, so I'm just praying they don't work loose. I had to slot-out 7 or 8 of the holes (up to 4mm!) just to get it over the studs, and the collector off cyl.5 fouled the stud & nut, so I had to file the weld seam & some of the pipe off just to get the fv(ker on ! !

am I allowed to say where I got it from? Hello, Legal dept. ! ! ? !

A high-mount would probably fit better, since the pipes aren't so tightly bent & grouped.

W0rp3D Grand Master

W0rp3D

Posted
Posted
I just put a low-mount stainless one on.

There's a week of evenings gone.. . . . :rolleyes:

Seriously thoughtless design, I couldn't get a proper go at torquing 2 of the nuts, so I'm just praying they don't work loose. I had to slot-out 7 or 8 of the holes (up to 4mm!) just to get it over the studs, and the collector off cyl.5 fouled the stud & nut, so I had to file the weld seam & some of the pipe off just to get the fv(ker on ! !

am I allowed to say where I got it from? Hello, Legal dept. ! ! ? !

A high-mount would probably fit better, since the pipes aren't so tightly bent & grouped.

I am looking at going a low mount soon, im only going a hi flow so i want to be able to use all the existing exhaust and cooler piping, would be good to know where you got yours from, pm me if you like.

W0rp3D Grand Master

W0rp3D

Posted
Posted (edited)

I would have thought that a tuned length manifold that is less restricive would have been more responsive and given a little more power, im only going a high flow so im looking for all the little things that make the car more drivable, the only plans i have so far are the injectors, fuel pump, high flow, low mount manifold and plenum, i already have a power fc, avcr and front mount.

Edited by W0rp3D
Devils_Advocate21 Mentor

Devils_Advocate21

Posted
Posted

The big question here is Tuned length manifold, so expect to pay the usual $1000 and up, only worth while from the gt30r and up range if you are after that special figure, Standard Log is fine for below that its been proven many times over Although other reputable brands do aid in gaining a better figure, but say that word reputable with good reason, as Above that low mount which has extensive mod to make it fit must have been similar design to an ebay special, and have to say that the low mount designs Do Not actually give much if any results as the hardness to get tuned length room and etc ask 6boost or other guys they may confim that for you.

For your above mods best to upgrade turbo back theres a start fmic another Cams another CAI and with the Highflow you shouldnt need to change either manifolds as both standard items will still give you excellent driveability on there own accord so theres some savings there, then again you can have dif suspension brakes to work on if you would like but unless you are planing on say going gt35r or gt3040 then highmount design external gate is the way to go then maybe change plenum and tb to suit, but at the stage you are at and highflows flowing dependant on what dyno between 240-270 all read different the standard items are fine as is spend money elsewhere.

Plus Added note change in ex manifold will most liklely result in change of turbo dump and front pipe positions as well as lines etc etc.

Hope that helps

Kinks Grand Master

Kinks

Posted
Posted

One of my mates put a stainless manifold on.

It cracked within a month.

He then put the standard manifold on and the car now makes 270rwkw. Which was much more than he was expecting (he didn't want to go past 240, but got a bonus).

vault13 Enthusiast

vault13

Posted
  • Author
Posted

Thanks for the input everyone, very interesting. I'm only in stage 1, so no aftermarket exhaust manifold for me.

I've done two turbo back exhaust installs now and for whatever reason it seems ridiculously easy to shear off the turbo to dump pipe bolts :) as happened again this time.

It was only one bolt and my mechanic reckons it should be fine with all the rest bolted up, seems fine so far.

Do you guys reckon its worth paying someone to drill it out?

Its the one furthest away from the engine, pretty tight but thought someone might be able to get a drill in there...?

Gazee Grand Master

Gazee

Posted
Posted
I just put a low-mount stainless one on.

There's a week of evenings gone.. . . . :)

Seriously thoughtless design, I couldn't get a proper go at torquing 2 of the nuts, so I'm just praying they don't work loose. I had to slot-out 7 or 8 of the holes (up to 4mm!) just to get it over the studs, and the collector off cyl.5 fouled the stud & nut, so I had to file the weld seam & some of the pipe off just to get the fv(ker on ! !

am I allowed to say where I got it from? Hello, Legal dept. ! ! ? !

A high-mount would probably fit better, since the pipes aren't so tightly bent & grouped.

Same thing happened to me, i ended up getting rid of it cos of all the hassles, really not worth it if your wanting to stay low mount..

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