|
|
Post by dickie on Apr 8, 2021 18:29:22 GMT
Hi folks, There I was just idly looking for a decent exhaust manifold and my fingers had a mind of their own and look what they made me order !!!!!!!
This has been developed by Simpson Exhausts for MX5partsni.
They are using one one their rally MK5
They are only available through mx5partsni, as they incurred all the development costs and own the rights to market this manifold.
It will be a shame to cover it up with exhaust wrap !!!!!!
Its a 2.5" outlet.
|
|
|
|
Post by wannabe on Apr 8, 2021 19:55:37 GMT
Wuuuuuut  That should be rather nice! It replaces the manifold and downpipe? (And Cat??) |
|
|
|
Post by dickie on Apr 8, 2021 20:18:20 GMT
Hi Wannabe,
Its just the Manifold,
I will have to buy a weld on metal element cat and then have a system made up for it.
I will use the local Powerflow Exhaust agent.
|
|
|
|
Post by atlex on Apr 8, 2021 21:26:57 GMT
Gosh, that looks rather well made.
|
|
|
|
Post by Zed. on Apr 8, 2021 22:38:30 GMT
Gosh, that looks rather well made. Simpson Exhausts are good. nothing else needs saying.  Rich. |
|
|
|
Post by thruxton on Apr 9, 2021 6:28:19 GMT
Yes it looks very nice.
But where is the data?
What does it actually do?
When producing a performance gaining product there just has to be data to back it up.
They've done all the 'developlopmemt -work' but I can't see what they are saying.
Not very impressed honestly.
For £850 people are entitled to see performance dyno run graphs.
I would expect them to shout about it if the figures are good.
Regards.
Rich.
|
|
|
|
Post by dadbif on Apr 9, 2021 7:20:33 GMT
Lovely piece of art, but incredibly expensive.
|
|
|
|
Post by Zed. on Apr 9, 2021 8:45:34 GMT
Lovely piece of art, but incredibly expensive. a friend had Simpson make a manifold for his Cosworth YB turbo engine, iirc was twice the cost of the manifold dickie has bought I'll get photo's when the engine is re-fitted to show their artwork..... Rich. |
|
|
|
Post by swordspork on Apr 9, 2021 9:32:50 GMT
I tend to agree with the above comments. Seems an awful lot when nothing to back up gains.
I think it is common knowledge that changing the manifold gives very little gain on these cars. Car passion did a good video on bolt on mods that showed this.
But, it does look very nice indeed.
|
|
|
|
Post by howardb66 on Apr 9, 2021 10:38:37 GMT
I put a tuned length tubular manifold on my Griffith & had the map tweaked to suit. Did a before & after RR comparison & it gained 40 hp.
|
|
|
|
Post by Zed. on Apr 9, 2021 10:52:29 GMT
I think it is common knowledge that changing the manifold gives very little gain on these cars. Car passion did a good video on bolt on mods that showed this. thats interesting  the standard Mazda manifold is horribly restrictive especially at the 'collector'  admittedly the standard engine package in an Mx5 is well matched and has litte to gain without massive work & ££££'s spent. also, remember dickie has a somewhat modified engine so a large-bore / long-primary pipe length manifold will unleash a few hp especially @ the higher rev-range Rich. |
|
|
|
Post by wannabe on Apr 9, 2021 11:35:23 GMT
I think it is common knowledge that changing the manifold gives very little gain on these cars. Car passion did a good video on bolt on mods that showed this. thats interesting the standard Mazda manifold is horribly restrictive especially at the 'collector' admittedly the standard engine package in an Mx5 is well matched and has litte to gain without massive work & ££££'s spent. also, remember dickie has a somewhat modified engine so a large-bore / long-primary pipe length manifold will unleash a few hp especially @ the higher rev-range Rich. I presume a full 2.5" system would be needed in order to prevent gas flow restrictions at a step-down joint to a smaller system? (I thought standard was a 2" system, with turbo cars running 3" systems because they have less worries about loss of low-down power through reduced back-pressure??) |
|
|
|
Post by schercheeroo on Apr 9, 2021 12:34:31 GMT
But where is the data? What does it actually do? When producing a performance gaining product there just has to be data to back it up. They've done all the 'developlopmemt -work' but I can't see what they are saying. In my opinion, practically all aftermarket items are only ever designed. Never thoroughly validated, tested or proven to work. The amount of investment needed to properly develop something like an exhaust manifold would be prohibitively expensive. |
|
|
|
Post by thruxton on Apr 9, 2021 12:49:50 GMT
Having developed many items over the years that did go into production and sold to the public, cylinder heads , manifolds, camshaft and complete engines.
I will tell you this.
Unless they are verified it means squat.
So this is what you do.
You have a reference engine.
You take it to John Sleath, ( look him up. ) there you do you before and after numbers.
NOT ON A ROLLING ROAD ..... PLEASE!
No!
But on a Heenan and Froude water brake engine dynamometer .
There, that's how you do it for real numbers and real results.
Regards.
Rich.
|
|
|
|
Post by schercheeroo on Apr 9, 2021 16:22:27 GMT
I'm interested in why you don't rate rolling roads. I've never used one, but I imagine using a vehicle as the test bed would be quite convenient.
|
|
le sigh