1 hour ago, HS30-H said:

By the way Sean, one of the clues to guide us regarding the Fujitsubo systems is their 'Legalis' name. They are a tested and licensed road legal system for the Japanese market. Most others are not, and may have to be removed when the car is tested. There are restrictions on fitment, clearance, safety and - crucially - noise. When discussing 'ideals', you have to take this into consideration for the Fujitsubo systems. 

Cheers - good point and not everyone wants to have to remove and refit a line once a year.

40 minutes ago, Sean Dezart said:

Ok, ok - the 50mm (missed off the sentence) dual-pipes that were (from Nissan) and still are (from Fujitsubo) commercially available are better suited towards the smaller cc engines (S20, L20 and L24) than larger.

There probably are but you're saying that you don't know of them ?

An E and D-Type have twin pipe systems (admiteddly the D(Type are VERY short) but both they have ridiculously short primary pipes compared to an L-gata and both are DOHCs.

So why is it that headers and lines are so 'drag' biased ? Only motorsport competition open (read affordable) for most owners ?

Thanks for the info - and so, again, a small cc, high revving engine...presumbly the pipe diameter was scaled up because :

a) it'll match the combustion chambers' demands

b ) it could fit under that model of car

How big is 'big' basing the sandard diameter at 50mm ?

I think you missed the point - Alan was talking scaling up - not me.

Re importer - of course but relevant here because they were quoted AND are the N-American official importers : nice to see the extra model-specific info in there - good customer-advice.

Interestingly, the RHD Legalis image shows two seperate resonator pipes as per the Spirit Garage version whereas that listed on Whiteheads' page is of the 'H' crossover design.

Yes, they do work but you're comparing the incomparable : a modern '90s, DOHC, variable valve timing, high revving engine to a relatively lazy SOHC conceived in the mid-60s.

I don't think that packaging is such an issue within the JDM which is for where all of these parts are destined. Do you believe that the new Fujitsubo offers more performance over the previous model or simply easier to fit around bigger diffs and with much better cround clearance which would (for me) be enough of an advantage in itself ?

Sean, all the info is in front of you, fujitsubo have put up graphs of its old system vs the new one.  It’s more than a better fitting system, it’s better performing.  With data. They make no suggestion it fits bigger diffs, it’s just better packaged/designed overall.

 

im comparing il6’s, even the 2.0 -2.8 none motorsport have duel pipes.

 

 

Edited April 3, 20186 yr by Jason240z

22 minutes ago, Jason240z said:

Sean, all the info is in front of you, fujitsubo have put up graphs of its old system vs the new one.  It’s more than a better fitting system, it’s better performing.  With data. They make no suggestion it fits bigger diffs, it’s just better packaged/designed overall.

im comparing il6’s, even the 2.0 -2.8 none motorsport have duel pipes.

Put 'em up lad and let's have a butchers again ! Perhaps the performance improvement was a good spin off but obviously no-one markets a product going backwards.

And others too but Nissan in their wisdom sold us single pipe exhausts after twin downpipes.

This is all intellectual mass-debate-ion unless someone with a Legalis system wants to try both* out on the same car, day, dyno ?

*a single exhaust 

Single pipes are cheaper and easier to make. I’d say cheaper to understand also.

 

did you go back and look at the fujitsubo info they give, where they compare new against old design of full systems?  

Id wager it still won’t fit round the larger tractor diffs.

4 minutes ago, Jason240z said:

did you go back and look at the fujitsubo info they give, where they compare new against old design of full systems?  

Id wager it still won’t fit round the larger tractor diffs.

No - being lazy after a long day....certainly there are cost implications on engineering a dual exhaust - bad enough on a single one  trying to get something to fit all S30s !

Well, reading through Whiteheads' description, it will fit with some machining 'perhaps' of the diff flange which would still leave it tight but exploitable.

Well if you stop being lazy it’s all there ? ignore what whitehead say, look At fujitsubo direct.

Nuts to you - lots of them ! 

So, can anyone come forward and say that their new, improved exhaust line fits around R200 diffs ?

6 minutes ago, Jason240z said:

Well if you stop being lazy it’s all there ? ignore what whitehead say, look At fujitsubo direct.

What ? This : https://www.fujitsubo.co.jp/english/legalis_r.html

Their own site shows an 'H' resonator, RHD shows twin pipes - which is correct ?  https://www.fujitsubo.co.jp/prods/detail/000000000000000979/00000000000000002324/00000546

On 4/3/2018 at 9:56 PM, Sean Dezart said:

What ? This : https://www.fujitsubo.co.jp/english/legalis_r.html

Their own site shows an 'H' resonator, RHD shows twin pipes - which is correct ?  https://www.fujitsubo.co.jp/prods/detail/000000000000000979/00000000000000002324/00000546

No Sean.  you've seen it before.  This.

 

https://www.fujitsubo.co.jp/prods/detail/000000000000002298/00000000000000005120/00001708

Thanks, so they are now twin pipes and not an H-crossover ?

How are they claiming to have increased torque and power ?

 

3000revs = 92dB

4500revs = 95dB

5000revs = 89dB ???

Standard (STD) FUJITSUBO Volume ralenti - 70 dB Bruit d'échappement de proximité (tr / min) - 95 dB 3000 tr / min - 92 dB 5000 tr / min - 89 dB Réponse de 3000 tr / min à 5000 tr / min - 106 dB

 

 

By running back to back tests, look at the new curve vs the old one..... proper development.

 

you confuse me sometimes!

I never said that there wasn't a proper improvement - I asked how they obtained that improvement ?

But I'm confused with their sound test results

How can you go from 92Db at 3000revs, 95 at 4500, down to 89 at 5000 and then up to 106 at 5000 revs ?

And all this on a stock L20 – a long way from a prepared stroker for example.

Compare the comparable.