Exige 380 exhaust onto a 350

Exige 380 exhaust onto a 350

Author
Discussion

mjw0321

Original Poster:

242 posts

90 months

Tuesday 11th April 2017
quotequote all
Hi All,

Do you know if it is possible for a dealer to easily swap out the 350's exhaust for a 380 exhaust and install the switchable valve control etc into the cabin? Do you have any idea of price and whether it produces th same noise as in the 380?


Thorburn

2,372 posts

157 months

Tuesday 11th April 2017
quotequote all
Don't know about the difference in the exhausts themselves, but Sport 350 already has a valved exhaust and if it is like the earlier Exige S (V6) Race Pack equipped cars has a button to open/close it on the steering cowl?

ryallm

89 posts

192 months

Tuesday 11th April 2017
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This thread mentions that a dealer offered to put a 380 exhaust on a 350 so it must be possible https://www.pistonheads.com/gassing/topic.asp?h=0&... I have read elsewhere though that there was some compatibility issue due to the diameter of the exhaust being different? I'd be interested to find the definitive answer on this.

Munkeyfeet

468 posts

144 months

Tuesday 11th April 2017
quotequote all
As you are in the South East i would phone Hoffmans or Bell and Colvill - they will know the answer and price.

However if it is £1500 would you not just go 2bular - cheaper, sounds great and weighs less!

mjw0321

Original Poster:

242 posts

90 months

Tuesday 11th April 2017
quotequote all
Munkeyfeet said:
As you are in the South East i would phone Hoffmans or Bell and Colvill - they will know the answer and price.

However if it is £1500 would you not just go 2bular - cheaper, sounds great and weighs less!
I've not heard the 2bular exhaust, but if it is similar to the Evora 400/Evige 380 exhaust then i'd be fine with that! Does using 2bular have any warranty implications?

Munkeyfeet

468 posts

144 months

Tuesday 11th April 2017
quotequote all
no, not at all.

In fact both Bell & Colvill and Hoffmans rave about them.

Call Jim, mobile listed on his website. He is currently developing a race exhaust which sounds great but gets into all UK track days - it also has no packing so no issues with higher temps seen on track!

If you won't track it then they do a road version which sounds very good and is valved.

He is a passionate scotsman so don't expect it to be a short phone call!

There are a bunch of 2bular videos on youtube.

321freeflow

281 posts

185 months

Tuesday 11th April 2017
quotequote all
Considerable differences between the 350 and the 380 (Evora 400) exhausts.

If you wish to fit the 380 exhaust to the 350, you need to also fit the downpipes (manifolds are the same on all V6 models).

Downpipes:



Bigger bore on the 380 - 60mm Vs. 51mm on the 350. Waste of time really with those manifolds/pre-cats. You see the 3" pipework after the flexy? 2.5" on the 350. Not a great design of merge collector on the 380(!) - more a 'T' junction than a merge.

Squirt-gun welding (MIG) - can you spot the leaks? Both downpipes!




Systems:



3" 380/Evora 400 system on the left. 2.5" 350 system on the right.

A curious anomaly on the 380/400 system; the pipe feeding the "quiet" section of the silencer is only 1.875"dia. A 3.5Ltr supercharged V6 breathing through a 1.875"dia pipe (up to 4500prm anyway) - although you can open the valve manually. EU drive-by noise tests are tough.

On the 350 it's 2.5" to the "quiet" section (although that is reduced internally to 2.125") -



Exhaust valve will operate the same way on both installs.

mjw0321

Original Poster:

242 posts

90 months

Tuesday 11th April 2017
quotequote all
Thanks very much for the detailed reply! Very helpful. How does the track system compare in sound to a normal 350? And how does the road system sound compare to the 380?

I currently don't have the Lotus, but have driven the Evora 400 and Exige 350. Loved the Evora 400 sound; it made it even more of an event, so would like to get similar on the 350 if/when I buy it.

Munkeyfeet

468 posts

144 months

Tuesday 11th April 2017
quotequote all
Where are you in the south east?

There is a lotus meet up just outside guildford on Sunday and with the amount of cars going I would imagine someone will have the 2bular or larini systems for you to listen to.

If you want to check for sure then head over to the lotus forums and ask in the sleg regional group.

mjw0321

Original Poster:

242 posts

90 months

Tuesday 11th April 2017
quotequote all
Munkeyfeet said:
Where are you in the south east?

There is a lotus meet up just outside guildford on Sunday and with the amount of cars going I would imagine someone will have the 2bular or larini systems for you to listen to.

If you want to check for sure then head over to the lotus forums and ask in the sleg regional group.
Thanks for the tip. I think we have stuff already planned for Sunday unfortunately.

swanny71

2,194 posts

173 months

Wednesday 12th April 2017
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Got a 2bular on my V6, it sounds similar but ever so slightly slightly different to the Evora 400 - just as loud with valves open, equally quiet with them closed. It's a little less "gargly" but every bit as good.

mjw0321

Original Poster:

242 posts

90 months

Wednesday 12th April 2017
quotequote all
swanny71 said:
Got a 2bular on my V6, it sounds similar but ever so slightly slightly different to the Evora 400 - just as loud with valves open, equally quiet with them closed. It's a little less "gargly" but every bit as good.
Thank you. Very useful to know!

321freeflow

281 posts

185 months

Wednesday 12th April 2017
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He He - "gargly" - that's a good description of the 3" exhaust as the valve opens and the revs are still climbing. Sounds crap to me.

Exhaust sound - it's all subjective when it comes to appreciation but owners should know that when the valve opens and the 3" bore comes into play, the boost drops and you lose 40bhp.

Wayoftheflower

930 posts

199 months

Thursday 13th April 2017
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321freeflow said:
but owners should know that when the valve opens and the 3" bore comes into play, the boost drops and you lose 40bhp.
biglaugh Missed April 1st by a bit haven't we.

321freeflow

281 posts

185 months

Thursday 13th April 2017
quotequote all
{ yawn } let's have an argument on the internet rolleyes

Dyno graphs from a leading Lotus tuner in Europe.

But hang on a bit and I'll show you some from the UK.

Wayoftheflower

930 posts

199 months

Thursday 13th April 2017
quotequote all
Oh... you were, serious?

That's an interesting point of view.

Perhaps you should take this revolutionary "They added exhaust back pressure! You'll be astounded at what happened next!" finding to the world?

The automotive industry will be delighted that smaller and more restrictive exhausts will increase the efficiency of belt driven superchargers.

rs200evo

126 posts

211 months

Thursday 13th April 2017
quotequote all
321freeflow said:
{ yawn } let's have an argument on the internet rolleyes

Dyno graphs from a leading Lotus tuner in Europe.

But hang on a bit and I'll show you some from the UK.
You obviously work in this area so do you agree with the graphs you saw and have a theory as to why opening the valve would result in a 40bhp loss? I'm intrigued now smile

321freeflow

281 posts

185 months

Friday 14th April 2017
quotequote all
Wayoftheflower said:
Oh... you were, serious?

That's an interesting point of view.

Perhaps you should take this revolutionary "They added exhaust back pressure! You'll be astounded at what happened next!" finding to the world?

The automotive industry will be delighted that smaller and more restrictive exhausts will increase the efficiency of belt driven superchargers.
Hmm - not sure you understand the word "boost" in the context of a forced induction motor? I'm having a few days off but will return to this later.

321freeflow

281 posts

185 months

Friday 14th April 2017
quotequote all
rs200evo said:
You obviously work in this area so do you agree with the graphs you saw and have a theory as to why opening the valve would result in a 40bhp loss? I'm intrigued now smile
I've seen the same drop in power when increasing the bore of the exhaust. Working with our Exige S 2ZZ-GE 4-1 manifold, we'd always seen good increases with various mods. Smaller SC pulley, bigger injectors/fuel pump etc. I wondered about stepping up to a 70mm exit on the manifold (from 63.5mm) - we were approaching 300bhp and it seemed a logical step. Unfortunately, we dropped boost and and 20bhp. On the MP45 SC cars, we use a smaller-bore 4-1 as the bigger-bore from the MP62 cars drops too much boost/power. Anyway, on a break, later.

Wayoftheflower

930 posts

199 months

Saturday 15th April 2017
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321freeflow said:
{ yawn } But hang on a bit and I'll show you some from the UK.
Hanging on a bit, more.