Quite good price. But just wondering if anyone has had one? I notice the sensor location is further down the pipe. Does it have a long enough wire to go down that far?
Getting car de-catted Thursday and a sports back box put on that I had laying around from a Triumph TR7. And I been planning to get a exhaust manifold anyway… Just wanted your views on this system.
Just thought I let you all know I lashed out and ordered one… should be here tomorrow… I think im going to cut the flange off and have a slide on pipe with clamp then straight pipe to back on car into box. easy and works out alot cheaper… I will add photos once done.
I had ebay stuff before. for other cars. and had no problems at all.. even if it does crack I happy weld it up again.. its not a mega thing. as long as the crack don't turn into a mega big hole lol.
with the o2 sesors… its just a single wire… So abit of cut and extend is req. nothing any normal person couldn’t handle.
also ordered some exhaust wrap as its so close to the induction. I prefer not to have hot air getting sucked in!
The MX5parts manifold cracked on me after a couple of years; the weld at the manifold flange. Although I was able to get it welded inexpensively, the welder warned others will fail. I suppose the MX5parts item is one of the better of the Chinese made efforts; it at least fitted the car. Others have problems in fitting to the studs, or clearing the subframe.
The poor standard of welds used is exacerbated by the one piece nature of these manifolds; Japanese manufacturers wisely use flexible Goodrich joints on the down pipe, so there is more give in the system. Helps dampen vibrations as well. The factory manifold also utilises a bracket on the bellhousing, which none of the aftermarket designs use.
Sure this negates the whole point of a shiny new stainless manifold though? The exhaust wrap bandages soon turn grubby and look like something that Howard Carter dug up in The Valley of The Kings.
The bore is virtually the same as the OE system so the only potential advantage over the OE system is a 4-2-1 design as opposed to a 4-1 design. Are the vendors claiming any mid-range torque improvements for these manifolds?
Im not going for looks here… the amount of heat they produce is quite alot… considering there isn’t much vents to get rid of the hot air under the bonnet. So wrap is a good way to keep the heat down… also keeps the flow of air quicker. As as soon as it starts to cool down it slows down.
I would say with the size of the pipes… is only worth changing if your going supercharger or some hot cams are involved. If not… the only gain your get is a deeper note.
but if you are going those routes then a good idea is the hack it off at the collector and weld a bigger pipe to it. This is something i have done to my triumph spitfire… as what kinda gain would you get from 4 - 2 -1 if the 2 pipes going into 1 pipe is the same size as one of the 2 pipes. when your trying to do a performance car.
Im using my local power-flow to do my a simple system. all that is involved is straight bit of pipe left bend into back-box right-bend out.
The heat generated is over egged; more worthwhile to insulate the heater pipes.
The risk when wrapping manifolds is the increased risk of corrosion (stainless steel still rusts) and the risk, especially if thin tubing is used, of burn-through. Track cars don’t worry about changing manifolds regularly.
If you are worried about excess heat, you are better off looking at ceramic coatings, or the Trackdog blanket
The very best manifolds on the market (say RB or JR) are good for 4-5 extra hp. Yep, they don’t do a lot . Some of the cheap manifolds result in a loss of peak power. The reason why the change is quite marginal, compared to, say a Sputfire, is that the MX5 Mk1 does not use a cast manifold; it uses a fairly decent tubular 4-1 design.
Right… just to let everyone know… i got the manifold today. and it looks very nice. I had to drill out the stud holes and I did a little bit of grinding on the port… got it all wrapped up and bolting in. fits well… the 02 sensor it very close to the gearbox. could of done moving around if I’m honest.
Currently down local exhaust garage. getting straight though done for it. Will go about doing a video. But I think for £109 you cant go wrong.
The welds seem very good… but I guess time will tell. I reckon with this system I be having alot more mid-range power.
