Page 7 of 8

Re: Back again...

Posted: Mon Jan 03, 2011 9:19 pm
by 75evo
Ben

Google active nsx exhaust. You will see how this nsx owner did up his system based on some harmonics he wanted to attenuate and amplify. I think the tuned length should be similar for our engines too. Sounded nice, but I personally prefer a Unicorse or the Unicorse look-alike they make in the UK.

Re: Back again...

Posted: Wed Jan 05, 2011 2:32 am
by la_strega_nera
Had a look at the NSX active exhaust thread, interesting but most of the pics are missing.
Took some pics of the install, will grab some more from underneath when I do an oil change tomorrow night...
So, rear manifold already converted, not welded to flange yet - had to dummy it up in the car to get the protrusion and angle right:
Image

Front manifold part way through - far right has already been made round and shrunk
Centre - half way through
Left - how they started after chopping the flange off.
Image

Front manifold installed:
Image
Image

and finally - the factory cast iron manifolds - much smaller internal diameter...
Image

Re: Back again...

Posted: Thu Jan 06, 2011 1:28 am
by Zamani
Ben,

Do you have the GTV 24V headers? Will they work in your 164? I think the GTV's engine is canted forwards even more than the 164s. If they won't work in your 164, let me know.

Re: Back again...

Posted: Thu Jan 06, 2011 4:40 pm
by la_strega_nera
hah hah, yeah, I've got the GTV V6 manifolds (don't I feel stupid. cut up some 24valve 164 manifolds, then 6 months later buy a 24 valve motor to put in the 164...) - front one is basically identical to 164, rear is a little different (see pic - right hand one is a 164 front I think - the GTV v6 has a slightly different collector and cheaper heatshield mounts).Image
Engine cant is the same I believe... the rear gtv v6 manifold should clear the subframe, looks like it'll be a bit tight doing filter changes though! Of course a set of 164 headers would probably line up with my modded 12 valve down pipes...

Re: Back again...

Posted: Fri Jan 07, 2011 12:01 pm
by kevin
Ben , there is not much space to work behind that back bank. At least on the gtv , and 156 there is a lot more space.z

Re: Back again...

Posted: Fri Jan 07, 2011 1:29 pm
by Mats
...and I have a 164 24v Super standing around, go figure.

Would break it for parts but it's too much work.. :roll:

Re: Back again...

Posted: Fri Jan 07, 2011 2:43 pm
by la_strega_nera
Yeah, know all about how tight it is in there - was a prick of a job doing the rear header, and whoever rebuilt the heads 25,000km before i bought it decided tightening up the rear manifold properly was too much like hard work for the same reason...
Stupid thing is I'd jump at the chance to make it worse using bits of integrale/155GTA driveline...

Re: Back again...

Posted: Fri Jan 07, 2011 4:41 pm
by Zamani
Ben,

I'm thinking of converting a 24V manifold on my 155 V6. It looks like the pipe spacing before it ovals is about right? Since you had to cut the parts where it was ovals, did you have to add short lengths of pipes between the header and 12V flanges?

Re: Back again...

Posted: Fri Jan 07, 2011 6:18 pm
by la_strega_nera
Was just out doing an oil change on the red car - there is no way that the 916 rear manifold is going to clear the engine mount/driveshaft support without some serious mods. Bollox - the bolt on heat sheild on the 916 header is a much better setup than the 164 setup.
Z - I carefull cut the flanges off so as to leave the full length of the pipe there (if you look at the one that's 1/2 completed you'll see i've actually cut half way through the weld bead on the inside where they're fitted) - then spent a bunch of time with a blow torch and hammers to make the tube round, and using the grinder and my welder I slit the tube and shrank it back down - where it's expanded out to the oval shape they tube is actuall increased in circumference.
One of the Stratos guys did it by welding short smaller diameter stubs to the flange plate and cutting the ovalised bit off and stepping the header - my flange plates (thanks Daniel) were the same diameter as the runners. Pipe spacing is spot on. You'll have to mod your down pipes, the 24valve are a bigger pipe and bigger bolt spacing on the flanges, and they won't quite line up...

Is the 916 style rear header going to work better for the 155 Z? if so I'll swap you :P

Re: Back again...

Posted: Fri Jan 07, 2011 6:24 pm
by la_strega_nera
Oh yeah, definitly going to go to a remote mount filter if I put the 24valver in it...

Re: Back again...

Posted: Sat Jan 08, 2011 11:52 am
by kevin
Some jobs behind that back bank I hate includes power steering pump out . Notice the 164 oil filter is smaller than the 156 and if some one over tightens it you need wrists like Arnie to undo it .

Re: Back again...

Posted: Sat Jan 08, 2011 4:47 pm
by la_strega_nera
Yeah, it's not fun back there on the right hookers with the clutch master poking out too. Screw doing a starter motor in the car!

Re: Back again...

Posted: Fri Mar 18, 2011 11:48 am
by Bruce
.. can you hear anything?

Re: Back again...

Posted: Fri Aug 31, 2012 2:41 pm
by la_strega_nera
so, the part throttle stumble i'd been chasing - thinking it was due to the previous owner dicking with the AFM spring (which they had) - turned out to be a blowing head gasket that then let go pretty badly. Dodgy temp sender meant i never caught it before it cooked properly.
Anyway, it's gone now, gone to Melbourne to be a spare parts car for someone who bought a 164Q new. Just didn't have the time/money to sort it out with impending wedding and trying to get the 105 finished for my wedding...

Re: Back again...

Posted: Sun Sep 02, 2012 1:38 am
by GTV27
congrats on impending nuptuals