manifold

BlackAstra2_2

I've just spent an hour typing a big explanation of the manifold system I've designed with JP Exhausts, but when I pressed submit it logged me out!!!!!
So the short version of what I wanted to tell you is the proposed stainless 4-2-1 manifold and 200 cell sports cat is likely to cost £500 which isn't bad when you look at Regal's price for just a sports cat. I need 5 people to confirm they are seriously interested otherwise it's not going to happen. I'll post more detail about the proposed system soon.
Thanks for the info you guys have provided so far.
Cheers.

Lightning_Coupe

SERIOUSLY intrested, moneys in the bank! but i'd like to hear what jp said they could deliver. The more technical the better. If its right enough but theres little intrest i'd pay a little more and spred the cost over fewer of us. I'm hoping we can create enough intrest though.

BlackAstra2_2

Thanks Adam. I will prepare some technical info and email it to you.
I'm going to create a new post to make sure people are aware to try to get more interest. Lets see if that helps.

LeeSRI

I am in, getting my crack welded tomorrow for £20 😃

BlackAstra2_2

Thanks LeeSRI. What diameter pipe is your exhaust?
Good luck tomorrow. Lets hope they are gentle!!!

LeeSRI

Not sure think its 2"! How big is the remus one?

BlackAstra2_2

This is the design of the manifold and cat available for £500 if I can get a few more people interested.

Lightning_Coupe

Hey Buddy, Sorry I've not got back to you quicker, Been working a lot. Anyway, been looking into manifold desighn some more and I found a good few things to incorporate into the design. You need to make a brew, and take a while to read this artical carefully to understan the effects certain changes in design make.

http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=2

I'm happy with the scetch youve drawn up with JP, in principle it looks good, but I think we could make some carefull additional specifications to it.

I read that you can get the best of both a 4-1 manifold in terms of peak power and the midrange torque of a 4-2-1 by using a 4-2-1 with steeped header pipe sizes. So at each collector, I.e. where the first primarys join and then again where the secondarys join, we should step up by 5mm or so. Aparently, steping the header prevents the exhaust flow from traveling backwards to the engine. This gives is an "ant-revision" charecteristic giving a broader power band, and becouse of the increase in cross sectional area you achive a greater peak torque figure.

Come on people! we just need a couple of more people and this can go ahead! 😃

xinitialz

lexmaul offeres a manifold for the z2.2SE with sportscat built in just like the one yer gettin made. Will pass MOT since the sportcat will keep yer emissions EURO 4

wouldnt it be cheaper to just get it send over from germany?

The manifold costs around 900 euro

Lightning_Coupe

The Lexmaul one is pictured above, its a 4-1 manifold not a tri-Y manifold like the one were looking at from JP Exhausts. The Lexmaul item will cost around £700, where as JP's offering is likely to be more like £500, substantially cheaper. Both have a sports cat and will pass uk MOT without a problem.

BlackAstra2_2

I'll have a read of the team-integra.net article and get back to you. I agree that while the opportunity is there we might as well take the time to get it right.

BlackAstra2_2

I'm still absorbing the info from the team-integra.net site, it's just what I needed, so many thanks to Lightning Coupé. Will do some calculations then produce a revised design. I like the tri-Y layout. It seems to produce some good results throughout the whole rev range. Here's a pic of a sequentially-paired stepped tri-Y layout with matching diameter from header to exhaust and added length in both the secondaries and primaries. I think this design forms a good platform which should offer substantial gains for the z22se engine, especially in conjunction with performance cams, but one step at a time eh!!! 😃

Lightning_Coupe

Good Picture! I agree the stepped Tri-y design is probably the best way forward. I know its only an example but I doubt we could use primarys and secondarys as long as those pictured above, there'd be nowhere left for the cat! well unless you extend the wires and put it in the center pipe but I'm unsure I want to persue that route. I dont think theres much more to specify, other than pipe diameters, but even with that you can only go so far. You start with a diameter close to that of the outlet ports and step up at each collector until your at the standard exhaust diameter, Or you go bigger and fit an oversized exhaust, but is that nessesary? As I'm sure youve read, bigger is not always better with a naturally aspirated engine, its all about getting the gasses out the back before they cool down and expand. A bigger bore will cause the gasses to flow slower and spend more time in the exhaust, its a bit of a trade off. What ever way you look at it, it can only be an improvment over the standard unit which is made to cost and not performance. I dont want to speculate but surley a tri-y stepped manifold and sports cat is gonna free up some ponys and make a noticable differance.

vocky

that's a cool design drool.gif

the reason the weapon R has the pipes going upwards is to increase the length of the primaries

Paul_brown

Looks good. just spent 300 with powerflow for my sports cat and precat. will be interested if that does come off, once i get the sensors sorted.

BlackAstra2_2

Hi Paul. I'd be interested to know whether the sports cat has made any difference to your cars power.

blue_se2

Got one on mine mate money well spent in my eyes a lot more responsive.

vocky

there's a used Regal 4-1 stainless exhaust manifold going on ebay tonight :shock:

will post a link when he's put it on ebay

vocky

£280 buy it now...........
E-Bay Link

BlackAstra2_2

Thanks for the eBay link Vocky. I think this manifold was designed purely as a direct replacement for the original cast manifold rather than a true performance part. But it looks good and probably offers an improvement over standard. I'm sticking with the development of the 4-2-1.

Glad to hear the sports cat is worthwhile blue se2. So this is why you're only interested in a tubular manifold, and probably quite interested in the regal manifold on eBay. Is your cat the 200 cell version and do you know the diameter of the entry and exit pipes and the diameter of the honeycomb section?

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