Stainless Manifolds???

[Waldo]

:wassup: Hey i was wondering wat people thought about the stainless exhaust manifolds, like do they crack easily and do they provide you with any decent power gains?

[cameron]

Q1. Depends on the grade of stainless and how hot it get's etc. - And also if you get a propper one made not a china copy. They usally cost around $1200

But No they don't crack easily! I've only seen one crack due to it being tampered with by another welder!

Q2. Yes, A stainless tuned length manifold will give you horsepowe gain's over stock as it flow's sh!t loads better.

You might notice a slight noise increase aswel.

Jun

[pnblight]

while we are on stainless steel manifolds does anyone know where you can get low mount gtr manifolds and ~ cost, have difficulty finding some cheers

[R31Nismoid]

www.nengun.com ?

[USRB25S13]

Q1. Depends on the grade of stainless and how hot it get's etc. - And also if you get a propper one made not a china copy. They usally cost around $1200

 

But No they don't crack easily! I've only seen one crack due to it being tampered with by another welder!

 

Q2. Yes, A stainless tuned length manifold will give you horsepowe gain's over stock as it flow's sh!t loads better.  

 

You might notice a slight noise increase aswel.

 

Jun

Does anyone have any pics of the cheap China manifold failing? I have yet to see a picture of one cracked. Just alot of "My friends car had one crack".

[R31Nismoid]

Lots of WA cars use em.

no problems in quite a while

[USRB25S13]

Which manifolds do you mean? The Topmount ones for extranal gates or the stock replacement ones?

[Waldo]

Just the bolt-on low mount jobs...with no external gate pipe....would they increase spool up time if so by how many rpm you think.....

does it really matter if its not equal length tubes...coz the orignal manifold isnt equal length eh...

[Yorik]

Equal length is for gas scavenging and for better flow characterisitcs as the gas is coming into constantly rather than the possibility of colliding and casusing turbulence.. In terms of spool up time on my SR20, I got maybe 150-200 rpm quciker boost response, what i did notice was a removal of the ceiling at 6500 rpm with the stock manifold and a really chunky torque boost at about 4500 rpm..

I got one of the SS Autochrome ones from the states about 18 months ago and got it ceramic coated and then I built a custom stainless heat shield. It was an excellent investment, that I realised even more once I changed to Tomei cams.. Quite worth your while in my opinion..

I too will be looking for GTR low mount jobs very soon.. Anyone get a decent price I am interested.

[Cillham]

boostworx put one of these $500 bolt on ones from perth on a rb25 and made no powergain what so ever on the dyno. I was considering it for my ECCS rb20 redtop, but ill think ill spend the money elsewhere

[Yorik]

-=my 2 cents=-

No Power gain is more than possible, extra flow at the wrong rpms will not help power, would be interesting to see the dyno sheet and the mods list. If no other mods I would say this si more than possible, but no torque gain is not so believable.. Add a few mods and actually utilise some of the extra flow potential and I am sure you will notice power gains, this is not a first cab off the rank mod, you should already have larger zorst, pod, dump, more boost before you consider this type of thing..

-=end rant=-

Word

[Cubes]

Equal length is for gas scavenging and for better flow characterisitcs as the gas is coming into constantly rather than the possibility of colliding and casusing turbulence.

The biggest benifit for a tuned length manifold is equal cylinder reversion during overlap.

Some claim it also aids in spool but I have yet to see the real world results.

Most claim the shortest route to the turbo gives the best turbo spool.

Obviously this method would not provide the best peak power as when rev's increase so does the exhaust flow, un-equal cylinder reversion & backpressure all of which lowers Volumetric efficiency. All depending on the cam specs and overlap.

[jnr32r]

so where can you source china ones from????????

[nedb]

eBay

[ecl]

umm. newbie question

are these manifolds only for aftermarket turbos or can i get one for the stock turbo ?

[Waldo]

sodo you guys think it would be a good idea to purchase one of these stainless manifolds the china ones off ebay ssautochrome. i just have a problem with spool up time and need to reduce it badly i thought this might help a bit. i have currently a high flowed t3 with t4 steel wheelso she doesnt hit full boost till 5000rpm and im running 1 bar boost i have a 3.5inch exhaust and HKS front mount. Im going to get a ball bearing turbo later on but i wanted to know if it would be good to get this manifold for m high flowed turbs, and use it when i get my new one....my rb lack a big amount of torque until 5000rpm it gives ya a decent kick in the guts...

[Cubes]

Look at the design of it.

Very Restrictive.

[600hp]

you can get the manifold that i would think may help but i thinkyou may have to invest in a set of cams and cam gear and then get someone with lots of experience to tune the whole thing.get the cams thing is of course if you don't already have some.

you could also get the head ported and get some splitfire coils theymay both help a bit.

[KamikazeR33]

guys i have seen a $2k one crack that was made by sub zero on a sr20....

but then again some ss manifolds havent... i guess its a bit of luck and what appliction its for

higher powered cars using one have a higher risk of cracking where a stockish one will have a low risk

[Waldo]

Do you think that these manifolds will overlap the cyclinders and cause turbulence, or have that put a little bit of effort into making them and made them so they dont.....Alls i want is less lag aye and i dont have the money for new cams