18 replies to this topic

[Gubben]

Yeah, I know - search and you will find.... But i have, and I get bits and pieces, I know you guys can answer me in a straightforward way so I'll ask anyway.

 

 

Well, I've had the car several weeks now so of course the devil in me is starting to think of modifications. Why do I never learn... Anyway, I think the winter project will be a supercharger. I have a charger from a cobalt (got it for 600USD, feels like a nice price) and later I will probably hassle you with a bunch of questions on what to buy and how to proceed.

 

First things first though.

 

My list of things to do with the car sums up as:

 

Fixing the driver seat

Getting a new exhaust

Supercharging the car

 

So my question is simply what exhaust I should buy considering the (hopefully) upcoming supercharger.

 

I looked (and listened) to the Larini from Lotus-Shop and it was nice. But is a larini with a sports catalyst enough? 

 

If not, can someone give me a good setup that will work even if supercharged?

Someone said Milltek, Someone said 2" is enough, someone said 2,5" is needed.

 

So, all you out there who has supercharged - what is the way to go?

 

Best regards

Fredrik

[Goosenka]

Or use the turbo back box. Are you going on track as this will narrow your decision. Never heard a Larini on supercharged. Probably very loud.

[D3YMO]

No straight forward answer...all depends on what bhp you want to run at...

 

Usually people go for the 2.5" Tullet System

 

Myself personally, im going to opt for 3" Tullet System as im aiming for 320+bhp ultimately

Edited by D3YMO, 14 August 2013 - 12:27 PM.

[rob999]

Do you want to track?

[smiley]

It's all about the horses you want to make. 

For a stock stage II conversion, with 3.35" pully, you can get away with 2".

In germany a stage II conversion means precat removal, and replace backbox for a turbo one. Those conversions have 260 max.

In such cases 2.5" is nice to have, but will not make 5bhp difference.

 

If you go stage III, it's a different story. In such cases 2.5" is highly recommended.

Unfortunately i have not seen anybody trying to get away with 2" on a stage III, so we just don't know.

 

Stage 5 (harrop) is still in conclusion mode so to say. No real evidency of what 2.5" versus 3" does on this specific setup.

 

 

 

Edited by smiley, 14 August 2013 - 12:34 PM.

[fezzasus]

I have the standard manifold, standard cat with pre-cat removed, and a larini back box and am generating 265 bhp with a 3.1" pulley. The backbox is generally considered the most restrictive part, followed by the manifold.

 

I would suggest considering the Dutch OBD tuner software, especially considering your location, that way any exhaust modifications do not cost extra money in paying someone to map the car. You can therefore start with the normal exhaust and upgrade when needed.

[Gubben]

Wow, that was really quick!

 

Basically it's going to be mostly (95%) road and just a couple days a year track. From what I've seen here with the SG its a 250 BHP mod or something like that, it will be more than enough for me.

 

From your responses i take it that i would probably get away with a 2" system, but 2,5" is the way to go. Larini is out.

 

The tullet system was pricy as hell though. Tullet adds up to (manifold + 100cat + silencer) 1650 pounds if my maths is right. Well if that is what it takes...

 

Can you tell me more about the option of precat removal and turbo backbox?

 

Sorry for being such a noob

/Fredrik

 

[D3YMO]

Mines running 260ish bhp and i have a full standard system and VSE, sounds nice, and doesnt seem to be restrictive at all at stage 2

 

i will be selling my VSE in the next couple of weeks i think after ive taken it off and give it another coating of paint

[fezzasus]

the Larini is a 2.5" system, and frankly it's no louder than it was as an NA

Edited by fezzasus, 14 August 2013 - 12:59 PM.

[techieboy]

the Larini is a loud 2.5" system.

[fezzasus]

 

the Larini is a loud 2.5" system.

 

 

ha, it really isn't as bad as I thought it would be. Even my neighbours say it's quieter

[smiley]

Do trackdays in sweden have noise limitation? (as the 2.5" tullett will bring you to 98db isch on flyby)

 

Top is an oem cat section.

Bottom has precat removed (and the cat section, but you will need that)

[techieboy]

(as the 2.5" tullett will bring you to 98db isch on flyby)

Depending on how it's measured!!! I've been measured all the way from 86dB to 107dB on drive-by's as there's no standard method and also depends on what your engine is doing at the time.

[smiley]

 

(as the 2.5" tullett will bring you to 98db isch on flyby)

Depending on how it's measured!!! I've been measured all the way from 86dB to 107dB on drive-by's as there's no standard method and also depends on what your engine is doing at the time.

 

 

Ok, let me refrase.

I have been consistently measured at around 98 with my tullett, on 2 different tracks.

On one track at about 6 meters, and at another at about 20 meters. 

 

Can we at least conclude that a tullett is a hazard for strict trackdays without naming numbers then?

Edited by smiley, 14 August 2013 - 01:26 PM.

[PaulCP]

  Can we at least conclude that a tullett is a hazard for strict trackdays without naming numbers then?

Nope! Mine was noticeably quieter after re packing with the latest acoustifill material. Recent 2 track days measured static at 89dBA @ 4500rpm (45deg @ 50cm) 93dBA @ 5200 rpm (45 deg @ 30-50cm) - was supposed to be 50 but looked closer Didn't trigger drive by limit of 90dBA but don't know distance

[smiley]

Not many static tests being done here in europe, mostly driveby testing.

Maybe that's the difference.

 

Edited by smiley, 14 August 2013 - 02:18 PM.

[davemate]

If you can pickup a cheap milltek or a turbo back box just live with that for now. If you then want more noise and a little more performance then swap. If you are not in a hurry you can wait for a cheap one to appear.

Edited by davemate, 14 August 2013 - 05:03 PM.

[Gubben]

Thanx, I think milltek will be right (at least it is not wrong from what i see above) and i'm in no hurry, Summer's coming to an end and the car will not be out more than 1-2 months max before its hibernation time. So there is plenty of time to find something suitable.

 

Once again thanx for your help.

 

/fredrik

[smiley]

Thanx, I think milltek will be right (at least it is not wrong from what i see above)

 

Ah, the jetfighter. Very good.