Exhaust system question on an NA

[Ricardod]

Hey,

 

Im pretty new here and bought golddigga's supe 7 months ago.

After 7 months and around 5000 miles i can say i enjoy'd every meter of it.

 

However time has come for the sexy naturaly aspirated beasty to be a little faster without boost due to financial problems.

 

i was thinking of a full decat using an Autobahn88 header or an OBX header, with a 2nd decat attached to that doesnt matter what brand it is. To top that off I kinda wanted to use my Blitz Nur Spec S back box.

 

Heres my problem:

As far as i know every 2nd decat consist of one pipe with kind of an S bend in it and an o2/temp sensor bung or something.

My nur spec S back box has 2 pipes. How am i going to use the back box with the 2nd decat?

 

how am i going to attach a single pipe 2nd decat to a 2 pipe back box?

 

Thanks in advance

 

PS: i'm Dutch so bare with me on the spelling and stuffs

[DodgyRog]

From the ends of the 2nd decat pipe you have a mid section, which goes into 2 pipes and has 2 silencers, each pipe runs down each side of the car and comes back together near the back, this is where the 2 pipes on the Nur spec S connect.

 

Hope that explains it, I am running full decat with silenced mid and Nur spec S, don't be put off by the fact you are keeping in 2 silencers, it's still fairly load:eyebrows:

 

Some exhaust clips etc on the youtube link below

[Nic]

As Rog explained there is the mid pipe between the 2nd cat and the back box. Pics below to illustrate, the Blitz NUR S is designed to fit the stock mid pipes.

 

Stock Exhaust - back box and mid pipes

 

 

1st and 2nd Cats - 2nd cat connects to mid pipe

 

 

Blitz NUR S Back Box - replaces stock back box

 

http://www.blitz-uk.co.uk/images/products/variantimages/hires/MT4030_1.jpg

Edited August 6, 2010 by Nic (see edit history)

[Ricardod]

ah i get it now manny thanks.

another question: whats the Whp gain on both cats removed and a race header?

is it noticeable if u have cats removed on an NA in performance gain?

Edited August 7, 2010 by Ricardod (see edit history)

[DodgyRog]

To be honest, I don't think the gains are much, maybe 20-30 Bhp, but it makes the N/A feel a lot more responsive and frees the power flow up.

 

You will definately notice a difference, I did my decat one at a time, so didn't get a big change all at once, but both times I took out a cat I noticed a difference, so if you do both with a header I am sure the difference would be very noticable.

 

Also you get a very nice sound, Pudsey heard mine recently and thought it was an M5 coming up the road on full WOT

[Ricardod]

sweeet, im seriously considering either NA-T or NA-BPU

NA-T (350/375Rwhp) costs around 2000/2500 euro depending on 2nd hand stuff.

NA-BPU (270Fwhp ish)costs around 750/1000 euro depending on 2nd hand stuff.

NA-TT (320Fwhp) costs around 3000 euro and not an option as im in love with the sound of my NA , and the way she is. might cost me even more to get a TT transplant too. besides i luv to DIY .

 

last option: get an 05 honda fireblade and my motorcycle license and sell the supe because i cant afford both due to being a student.

 

im so fed up with these kind of choises i have to make.

 

what to do, what to do.

 

i need some input on this one...

Edited August 7, 2010 by Ricardod (see edit history)

[Ricardod]

decided to stay NA due to financial issues.

 

ive got another question.

 

What does water/meth do to a non turbo?

 

what are

the hp gains?

tq gains?

pros?

cons?

[Neil-NA]

I wouldnt bother mate, if you have done the full exhaust then there is not alot more you can do without spending huge amounts for little gain.

[neo2810]

Has anyone fitted a single sports cat (instead of first decat) and a 2nd decat? Any performance benefit over 2 decats?

 

As far as I know with a sports cat there should be no performance loss over a decat and it will improve economy and emissions? Anyone shed some light?

[Dim Sum]

Sorry to interrupt. I currently have a HKs Super drager and looking at the picture the only thing i need to change now for it to be de-cat is the second picture right?

 

If so would anyone recommend the de cats on ebay?

[ilicos]

I think Paul Whiffin sells de-cats for the N/A.

[Nic]

Has anyone fitted a single sports cat (instead of first decat) and a 2nd decat? Any performance benefit over 2 decats?

 

As far as I know with a sports cat there should be no performance loss over a decat and it will improve economy and emissions? Anyone shed some light?

 

A sports cat will still be more restrictive than a decat pipe(s), performance and economy should be better with no cats, emissions will not be as good.

[Nic]

Sorry to interrupt. I currently have a HKs Super drager and looking at the picture the only thing i need to change now for it to be de-cat is the second picture right?

 

The Super Dragger is a cat back exhaust ie. everything from the 2nd cat back. Yes you would need 2 decat pipes to replace the 1st and 2nd cat shown on the second pic. Note removing both cats on an NA makes the car very loud, but will give a slight performance increase.

 

The other option would be to fit a tubular manifold, this replaces the stock cast manifold and the 1st cat, you would then just need a second decat pipe.

 

http://img98.imageshack.us/img98/8473/p1030161sa4.jpg http://img142.imageshack.us/img142/3957/dsc00312gm4.jpg

[DodgyRog]

The Super Dragger is a cat back exhaust ie. everything from the 2nd cat back. Yes you would need 2 decat pipes to replace the 1st and 2nd cat shown on the second pic. Note removing both cats on an NA makes the car very loud, but will give a slight performance increase.

 

The other option would be to fit a tubular manifold, this replaces the stock cast manifold and the 1st cat, you would then just need a second decat pipe.

 

http://img98.imageshack.us/img98/8473/p1030161sa4.jpg http://img142.imageshack.us/img142/3957/dsc00312gm4.jpg

 

Can you still get the manifolds Nic and are they a good fit, as in plug and play, no messing around to make it fit

[barneybrendan]

To be honest, I don't think the gains are much, maybe 20-30 Bhp, but it makes the N/A feel a lot more responsive and frees the power flow up.

 

You will definately notice a difference, I did my decat one at a time, so didn't get a big change all at once, but both times I took out a cat I noticed a difference, so if you do both with a header I am sure the difference would be very noticable.

 

Also you get a very nice sound, Pudsey heard mine recently and thought it was an M5 coming up the road on full WOT

 

he said mx5 you wolly

[Ricardod]

lmao @ mx5

 

my current setup for NA BPU

 

Apexi super induction kit +5hp

Xerd headers +17,5hp

2nd decat +7,5hp

toyo sport catback +10hp

Unorthodox cam gears +10hp +1deg intake -3 deg outlet

Apexi AFCR (currently fitted) +5hp

 

am i right this will get me to 275hp ish?

Edited August 11, 2010 by Ricardod (see edit history)

[Kirk]

Not a chance, if it were that easy to make power I think all NA owners would be happy. Don't believe the quotes made by the manufactures, to make NA power you have to think TBs, internal work, cams etc etc etc

[Neil-NA]

lmao @ mx5

 

my current setup for NA BPU

 

Apexi super induction kit +5hp

Xerd headers +17,5hp

2nd decat +7,5hp

toyo sport catback +10hp

Unorthodox cam gears +10hp +1deg intake -3 deg outlet

Apexi AFCR (currently fitted) +5hp

 

am i right this will get me to 275hp ish?

 

Where on earth have you plucked them figures from? the only one that is remotley proven is the exhuats manifold and FULL system may give in the region of 15-17RWHP (check supra forums)

[Ricardod]

actualy ive got it from suprastore and they made a diagram of the tuning upgrades and what hp gain they will have. not that they are well known for their good reputation on the yank webby tho.

 

if u guys are serious about an NA not gaining any performance when putting all that stuff on then im going na-t because i want at least +50hp without spending a shitload on cams/high compression and such.

 

those darn lightweight b18 civics and integras are anoying the S$it out of me.

mini cooper S'es too

[Neil-NA]

Not a chance of gaining 50bhp on an NA without stupid amounts of money.

 

Is it not just cheaper for you to do a TT conversion?

 

How much is an NA-T conversion?

[Ricardod]

somehow its cheaper for me to go NA-T rather then NA-TT

labour is on me, my dad and propably some friends of mine

 

setup:

RPS sport series clutch - 460 euro (new)

Intercooler pipework - 100 euro (new)

Mapecu 2 - 510 euro (new, will try to find 2nd hand)

Xspower T61 turbokit - 1400 euro (new)

12x24x3" polished aluminum front mount intercooler

2JZ-GE polished stainless steel manifold, fully braced

40mm wastegate

polished stainless steel dump tube

HKS SSQV 2

3" v-band clamp kit

3" v-Band polished stainless steel down pipe with 02 sensor bungs

teflon and braided stainless oil supply line, high temp drain lines & flanges

gaskets

turbo oil return plate (to oil pan)

 

this all is including shipment.

 

for u lazy bums this is 2023,81 pound on current exchange rate.

 

this would get me to around 330rwhp which is equal to a full BPU TT and propably a tidy lighter too.

 

i cba to buy a brand name turbokit as ive seen manny on clubna-t break down anyway and this holds up just perfectly compared to

other brands asking 5k+ dollars minimum without EMU, clutch and sometimes other parts.

 

the only brand i havnt seen to have anny problems is the boostwerx, boost logic, PHR na-t kits.

 

besides im on a tight budget

Edited August 12, 2010 by Ricardod (see edit history)

[Ricardod]

to make u guys consider even more, whats the point in having paid 5k dollars for an incomplete turbokit if u can get one unused but testfitted secondhand for 1000 dollars complete including everything from ecu down to the header wrap for a turbo instal minus midpipe and clutch.

 

u can either buy a branded turbokit for $5k that lasts 5 years

 

or u can just buy ebay turbokit for $2k that lasts 1 or 2 years and buy new components instead. for not to much money.

 

u can also buy components that dont suffer mechanical stress from ebay like FMIC and manifold IC piping or whatever and combine it with a good quality turbo wastegate etc.

[Ian C]

The MAP-ECU2 can't handle NA to forced induction, it has no injector signal control, all it can do is change the airflow signal and that's no good when you double the range and near triple the fuel requirements, it'll never run right.

 

Oh and good luck with an XS Power turbo People have had varied results with them, some were warped and practically unusable/unfittable on arrival, others lasted 2000 miles. A few lasted longer, don't know if any are still going now though.

Edited August 13, 2010 by Ian C (see edit history)

[Dnk]

Buy a tt and do it properly

[Neil-NA]

The problem with buying used parts is the unknown quality of the items you are buying, i once bought a 3071R turbo that had done 1000 miles and it was ready for the scrap bin

 

I bought this over the netz

 

 

It turned up with chunks missing

 

 

and later turned out to have a few cracks in it.

 

If you are happy buying used parts ( no doubt you know what your doing) then dont let anyone stop you, as you say there is a big saving to be made

 

Either way good luck with it, start a project thread and keep the updates coming