stainless steal manifolds

[chopper]

Before i start i have done the search to death and haven't found my answer so i will beg my question.

Stainless steal manifolds : i have been looking at them in some detail now and i know what is good quality and what it not. But my question is to those people who have a good one on there R, are they worth it? Do they improve lag and torque at all like they should. Or is it a waste of money? Can you notice the difference with them installed??

I was looking at a custom built one from mercat in scottland or a HPI one.

Your thoughts please

 

[markwashington]

They do increase torque/power, but in my opinion for power less than 400bhp they are an unnecessary expense, a standard manifold which has been ported will flow plenty for 400bhp, plus they simply wont crack, stainless ones regardless of how much they cost always run this risk, Check out Bob's track car thread as he was running an HPi manifold which had to be re braced (I now own it). Basically the choice is yours but I'd think long and hard about spending a considerable amount of money on an SS manifold if you aren't chasing serious power.

 

[warpspeed]

go for a tubular manifold, but why stainless? go mild steel and get a zircotec coating then you will have no problems with cracking or rust

 

[PobodY]

Inconel ftw! ;-)

 

[warpspeed]

bastard to work with and not very cheap, but yes definately the best for the job IMO

 

[Makaveli_se7en]

Inconel ftw! ;-)

OI! that's my line.

No point in running an after market manifold unless you are going to to turbo frame size that needs a bigger exhaust flange. A good manifold will cost in the realms of £1000+ (Lovefab, protech etc.), so its worth thinking if its really worth the expense and what you hope to achieve.

Interestingly enough saw some results recently which showed a log manifold to have less lag than the a tubular one on the same set up. It lost out at the top end with a reduction in peak torque and power, exhaust temps were also a bit high, but an interesting result none the less.

 

[PobodY]

Wasn't turbinetech in Canada selling them a couple of years ago; specifically for a Mitusbishi turbo maybe?

 

[JIMMYBACK]

a tubular manifold is like adding a goose exhaust and running the car from standard boost to 1 bar, the difference is amazing

there is a HPI one for sale on the modifiers club buy it, i would if i had the money8)

 

[velly4]

Wasn't turbinetech in Canada selling them a couple of years ago; specifically for a Mitusbishi turbo maybe?

They are still making them, if Canada Post would go back to work I will have mine very soon hopefully. I had mine done in Mild Steel. They also do a dump pipe to suit.

 

[williams]

imo, it will only cost 1k if you are getting a manifold/motorsport specialist type company to make it for you. the bloke i got to make my exhaust is a very good fabricator, doesnt know much about cars but can do anything you want with a welding torch! hes quoted me roughly £450, that was over the phone, price will change when he sees what i want though, may even be less if hes expecting to use the same amount material as an NA manifold.

 

[chopper]

The cost is not the issue because you get what you pay for.
So they do inprove power and they reduce lag correct? would a ported standard one do this aswell?
if the turbo gets to boost quicker then shorly there worth it as you get the power sooner
less lag = full boost sooner = quicker 0-60 correct?

 

[velly4]

The reason I have gone the manifold from Turbine Tech is for the twin scroll. The person building my turbo to suit this set up is expecting 20psi boost by 3700-4000rpm.
I'm currently running the stock turbo with 2871 internals, stock manifold and AM Performance split dump pipe. With this it hits 20psi at 5200rpm.

 

[markwashington]

From what I read, The standard manifold offers less lag, but loses out on power and torque higher in the rev range. I may be wrong in which case hopefully someone will come on here and correct me!

 

[chopper]

this is the wrong turbo fitment isn't it?
http://www.jperformance.co.uk/nissan-pulsar-gtir-sr20-n14-cast-iron-turbo-manifold-p-668.html

does say direct replacement but doesnt look right to me

 

[skiddusmarkus]

Its for a top mount turbo with external wastegate, not standard no.

 

[Spikey]

What did the Nme cars use? Be Interesting to know. im using a Greddy Manifold on mine.. Ill see the gains when its been mapped...

 

[Spikey]

I did see a write up a few months ago . where they used a Tubular Manifold on a standard s14 and it made no Difference on the Dyno But then our engines are Different...

 

[Spikey]

Log manifolds do have their benefits though: they’re cheap, they’re easy to make, they’re durable (especially if cast and not welded), and they allow the turbo to spool very quickly due to its stubby primaries (an exhaust primary is the first tube through which exhaust gas from the cylinder flows; there is one for each cylinder) and overall smaller volume. If you go with a log manifold, make sure that the flange that bolts to the head is cut between each runner. The resulting spaces between the flanges of each runner will allow them to expand and contract independently as they’re heated up and cooled down, preventing the chance of cracking. Log manifolds are usually made of thick, mild steel--again, there's no point in using expensive and hard-to-work-with stainless steel if the main selling point of a log manifold is price.

Tubular manifolds are more expensive than log manifolds, but they do have their benefits. The design is far more efficient and high flowing, and while 350 whp can easily be produced using a log manifold, if you are looking to run a lot of boost and plan on making a lot of power (400+ whp), a tubular manifold will get you to your goal quicker. And while the longer tubes might increase the time it takes the turbo to spool up, a tubular manifold will never restrict flow (and therefore power) to the turbo in the upper RPM ranges. In fact, if you have the money, you can have the quick spool time of a log manifold with the high flowing characteristics of a tubular manifold:

 

[watoga]

this is the wrong turbo fitment isn't it?
http://www.jperformance.co.uk/nissan-pulsar-gtir-sr20-n14-cast-iron-turbo-manifold-p-668.html

does say direct replacement but doesnt look right to me

I bought one of these a while back to use in conjunction with a large T3 turbo. The build quality is nice, however the faces (head, head & wastegate) were not completely flat. I got a light skim on the faces to make sure they won't leak, but as of yet I haven't fitted it. Mostly because I can't decide which wastegate to buy. But I'll post up how I get on.

Cheers,
Dave

 

[johnsy]

Horsham developments have made one, i think its about 190gbp, they have dyno graphs to show the difference between the two manifolds