Jump to content
SAU Community

Recommended Posts

  • Replies 65
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

I agree with you there, It does start to get a bit pricy, by the time you throw on HPC coating and then have to get them fitted.

But hey, at least it isnt as much as the turbo guys have to pay for a better manifold and dump pipe, and as you can see from my dyno graph, they did make a fairly nice increase and made the engine sound nicer.

If you are serious about getting more power out of your NA, you cant go past the exhaust system.

Plus you might as well do it first and have it sounding so nice while you drive around.

Just an update on my system,

I got a hot dog put on today, as even tho that car sounded bloody fantstic, it was a bit much all the time.

So now it still sounds fantastic, but I can also live with it as my daily.

it still needs all 6 cylinders to get a correct reading, on a skyline it isnt to costly but on the xr6 it wouldnt even idle correctly (like the afm was blocked) then moved O2 sensor and it was ok :P

dont worry i will have a dyno on here soon after i get money because the thing that rhymes with smishsmorson is happening on thrusday and ill have money 2 weeks after that that i can spend on that :P

  • 2 weeks later...

hey guys its the Hesh here. Yes we went ahead with the uk coby group buy. took ages as i had to go off for an unplanned 4 month holiday in saddams old back yard.

anyhoo toolman, myself and two others on so.com purchased the coby d12s. cost finally to us was 216gbp a set all done including vat and handling charge in the country so not at all bad.

i hope to fit mine tomorow. interesting to read some of the coments on here regarding exhaust size. i recently had a mate whos handy with a welder do a bit of an experiment. he took a 3inch system from a 32 gtr welded a tube in the middle section behind the cat 9mins a 334door so a tad longer) and stuck on a trust end can .......man that was LOUD...but car was flat as apancake..drove it round for week like that then went back and he made a 3inch to 2.5 reducer and we fitted a twin exit calsonic back box from the shop floor.

revs up much better! so with the cobys bolted up tomorow i am really looking forward to seeing how she does...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Latest Posts

    • You are selling this? I have never bought something from marketplace...i dont know if i trust that enough. And the price is little bit "too" good...
    • https://www.facebook.com/share/19kSVAc4tc/?mibextid=wwXIfr
    • It would be well worth deciding where you want to go and what you care about. Reliability of everything in a 34 drops MASSIVELY above the 300kw mark. Keeping everything going great at beyond that value will cost ten times the $. Clutches become shit, gearboxes (and engines/bottom ends) become consumable, traction becomes crap. The good news is looking legalish/actually being legal is slighly under the 300kw mark. I would make the assumption you want to ditch the stock plenum too and want to go a front facing unit of some description due to the cross flow. Do the bends on a return flow hurt? Not really. A couple of bends do make a difference but not nearly as much in a forced induction situation. Add 1psi of boost to overcome it. Nobody has ever gone and done a track session monitoring IAT then done a different session on a different intercooler and monitored IAT to see the difference here. All of the benefits here are likely in the "My engine is a forged consumable that I drive once a year because it needs a rebuild every year which takes 9 months of the year to complete" territory. It would be well worth deciding where you want to go and what you care about with this car.
    • By "reverse flow", do you mean "return flow"? Being the IC having a return pipe back behind the bumper reo, or similar? If so... I am currently making ~250 rwkW on a Neo at ~17-18 psi. With a return flow. There's nothing to indicate that it is costing me a lot of power at this level, and I would be surprised if I could not push it harder. True, I have not measured pressure drop across it or IAT changes, but the car does not seem upset about it in any way. I won't be bothering to look into it unless it starts giving trouble or doesn't respond to boost increases when I next put it on the dyno. FWIW, it was tuned with the boost controller off, so achieving ~15-16 psi on the wastegate spring alone, and it is noticeably quicker with the boost controller on and yielding a couple of extra pounds. Hence why I think it is doing OK. So, no, I would not arbitrarily say that return flows are restrictive. Yes, they are certainly restrictive if you're aiming for higher power levels. But I also think that the happy place for a street car is <300 rwkW anyway, so I'm not going to be aiming for power levels that would require me to change the inlet pipework. My car looks very stock, even though everything is different. The turbo and inlet pipes all look stock and run in the stock locations, The airbox looks stock (apart from the inlet being opened up). The turbo looks stock, because it's in the stock location, is the stock housings and can't really be seen anyway. It makes enough power to be good to drive, but won't raise eyebrows if I ever f**k up enough for the cops to lift the bonnet.
    • There is a guy who said he can weld me piping without having to cut chassis, maybe I do that ? Or do I just go reverse flow but isn’t reverse flow very limited once again? 
×
×
  • Create New...