I am thinking about fitting the Janspeed manifold on my stage 1 exhaust. Does someone have experience about it, regarding sound improvment (limitation on some tracks?), power change (according to the dealer 10 bhp )
Thanks
beno�t
I dont know about the absolute gains but the car I went in had a Janspeed manifold, cat and silencer. The sound levels were not intrusive, it cetainly isn’t boomy, but it had a raspy note on overun, but the general impression was that it was very smooth. I guess the exhaust note and lack of boomieness was down to the tailbox mainly.
The car was also fitted with the new Lotus sport ECU which switched at 5200rpm ish and I’ve got to say that the midrange was totally changed, it just went like [censored] off a shovel. None of the asthmatic 5000rpm dip, totally made the car.
Have the issues with the manifold been sorted then?
I’ll check now
I had one fitted in July and it had cracked by September. Back to OEM now.
Finally I did not buy it. The dealer told me they had too much problem with the steel and they need to improve the product. I saw two broken manifolds myself. Sounds was excellent BTW
Ooops, sorry I completely forgot to post up the results of my digging. PTP rang me just as I was leaving the office one evening last week. They appear to have dropped Janspeed in favour of Piper manifolds now… I wonder why?
I guess the Janspeed one was just hanging in the wrong place and applying load to the metal. Stainless steel is a pretty poor material to make manifolds from. Mild is much tougher in the long term (but it rusts) so you want to get an inconel one ideally!
Stainless steel is a pretty poor material to make manifolds from. Mild is much tougher in the long term (but it rusts) so you want to get an inconel one ideally!
and the winning lottery numbers are??
Ooops, sorry I completely forgot to post up the results of my digging. PTP rang me just as I was leaving the office one evening last week. They appear to have dropped Janspeed in favour of Piper manifolds now… I wonder why?
I guess the Janspeed one was just hanging in the wrong place and applying load to the metal. Stainless steel is a pretty poor material to make manifolds from. Mild is much tougher in the long term (but it rusts) so you want to get an inconel one ideally!
Hmm, never had a problem using Stainless (304) in manifold production. Appropriate attention must be paid to expansion/contraction. Looking at the Janspeed design, perhaps they forgot about this property? The primaries veer alarmingly in several different directions (obviously to pick up enough length)but the stresses induced must be quite high.
True, we dont see failures that often, but we’ve had a few that have been a right pain in the bum. Turbo manifolds mainly where you have to get 3/4/5 primaries to join up in as short as possible distance.
In normal use I’ve only ever seen cracked endplates (magnex centre box on our old 106Rallye and on my dads old diesel camper) and core tubes on silencers(stage 2 lotus).
BC
True, we dont see failures that often, but we’ve had a few that have been a right pain in the bum. Turbo manifolds mainly where you have to get 3/4/5 primaries to join up in as short as possible distance.
In normal use I’ve only ever seen cracked endplates (magnex centre box on our old 106Rallye and on my dads old diesel camper) and core tubes on silencers(stage 2 lotus).
BC
Yup, Type 321 Stainless should be used on Turbo manifolds. I see these T304 manifolds for Jap turbo installs for sale on e-bay and I cringe.
Inconel? THE best material for hi-temp exhaust applications - never Titanium.
I remember when Micron (Magnex) moved over to the car world with their new auto exhausts. They had a big 10x4 box for the Escort turbo, no braces/skidplates though. I’d had an interesting time with that new end-plate and advised the chap on their stand. He looked at me and sneered “our R&D dept has tested everything to the max”. They were replacing turbo exhausts for months. Looks like they still haven’t “tested everything to the max!”
True, we dont see failures that often, but we’ve had a few that have been a right pain in the bum. Turbo manifolds mainly where you have to get 3/4/5 primaries to join up in as short as possible distance.
In normal use I’ve only ever seen cracked endplates (magnex centre box on our old 106Rallye and on my dads old diesel camper) and core tubes on silencers(stage 2 lotus).
BC
Yup, Type 321 Stainless should be used on Turbo manifolds. I see these T304 manifolds for Jap turbo installs for sale on e-bay and I cringe.
Inconel? THE best material for hi-temp exhaust applications - never Titanium.
I remember when Micron (Magnex) moved over to the car world with their new auto exhausts. They had a big 10x4 box for the Escort turbo, no braces/skidplates though. I’d had an interesting time with that new end-plate and advised the chap on their stand. He looked at me and sneered “our R&D dept has tested everything to the max”. They were replacing turbo exhausts for months. Looks like they still haven’t “tested everything to the max!”
Jeez! Waht a gibberin heap a p*sh! Just shows you waht happens when the wife has her works Christmas bash and you’re left at home!