Official Quad Exhaust Modification Topic

[cj10jeeper]

Look at the differenc on Ranski's though.

No preventative sealer - makes you wonder why yours has 'preventative'
Tie bar is connecting pipes not butted into the actual boxes.

Similar layout - big difference in execution and appears to result in no issues


BTW - just to reassure I'm not meaning to criticise per se, rather highlight the issues so you can raise them and get the job done you expected and paid for.

 

[wills]

Look at the differenc on Ranski's though.

No preventative sealer - makes you wonder why yours has 'preventative'
Tie bar is connecting pipes not butted into the actual boxes.

Similar layout - big difference in execution and appears to result in no issues


BTW - just to reassure I'm not meaning to criticise per se, rather highlight the issues so you can raise them and get the job done you expected and paid for.

Absolutely - these are main things I shall highlight tomorrow.

Many thanks for feedback & advice cj10jeeper & all, much appreciated as always.

Off for a pt session now to lose some stress..!

 

[Greeno]

Power Loss..?!

Picked up car from having a service & mechanic said sounds great but big power loss with exhaust, should be a lot quicker - wtf!?

It seems the same to me but I guess he's the 'expert'

Yes, it is possible and highly likely. there is loads of science behind gas flow through the exhaust system. the gas needs energy (from the engine) to be pushed out - in simple terms.

i'm no expert but know a bit of a geek on the subject who did loads of modelling of a new exhaust system he was installing on a project of his.

He also had a love of building jet engines on his kitchen table so that should give you an indicator......

 

[wills]

Likely, but reading about it - a 'freeflow' exhaust has more power at top-end, so very confused.com, plus my crude 0-60 timings & general feelings are performance unchanged.

Anyhow, shall do a dyno test on Monday to see how it's looking. If it's poor shall get an ecu flash.

 

[cj10jeeper]

Likely, but reading about it - a 'freeflow' exhaust has more power at top-end, so very confused.com, plus my crude 0-60 timings & general feelings are performance unchanged.

Anyhow, shall do a dyno test on Monday to see how it's looking. If it's poor shall get an ecu flash.

At this level of relative cooking engine it won't make much difference at all to performance, just noise and vibration
If you're getting the to better end of the market then it's a scary science of pipe diameter, gas speed over rev range, backpressure, sound waves in the tubes, scarification and so on.

Don't worry about it - you'll make no real difference to your performance

 

[wills]

Likely, but reading about it - a 'freeflow' exhaust has more power at top-end, so very confused.com, plus my crude 0-60 timings & general feelings are performance unchanged.

Anyhow, shall do a dyno test on Monday to see how it's looking. If it's poor shall get an ecu flash.

At this level of relative cooking engine it won't make much difference at all to performance, just noise and vibration
If you're getting the to better end of the market then it's a scary science of pipe diameter, gas speed over rev range, backpressure, sound waves in the tubes, scarification and so on.

Don't worry about it - you'll make no real difference to your performance

I hope so...

Anyhow it's booked in for a Dyno test tomorrow 9am, & exhaust being redone by Longlife today.

Watch this space for results..! Bets anyone..?

 

[Exactmax]

There shouldn't be any performance loss, if anything it will make the car slightly quicker with the excess weight cut out

 

[Bradders75]

Sorry to see the grief you're having with the quad wills. The workmanship looks pretty awful from the pics you've shown, I doubt they could have got you out of the work bay any quicker! Apart from the points already raised, I don't like how the tailpipes aren't staggered to follow the bumper curvature like the OEM set up.

 

[wills]

All sorted today. They couldnt have been more apologetic.

Right tip now in line, neat welding, new rear boxes and all much higher quality. Sound is also much quieter ie no heavy droning, but still sounds good at high revs.

Convinced low down torque is affected by having a quad but dyno test at 9am tomorrow will tell all!!

 

[cj10jeeper]

All sorted today. They couldnt have been more apologetic.

Right tip now in line, neat welding, new rear boxes and all much higher quality. Sound is also much quieter ie no heavy droning, but still sounds good at high revs.

Convinced low down torque is affected by having a quad but dyno test at 9am tomorrow will tell all!!

Excellent that you have it fixed. Glad you did the research but a shame they allowed something lke that to happen.

 

[RichardG]

Excellent that you have it fixed. Glad you did the research but a shame they allowed something lke that to happen.

Couldn't agree more, glad it's all sorted now.

 

[wills]

Well dyno test not great news; just 242bhp at engine, at wheels around 205...! Shall post exact figures in a new topic later today.

They dont think exhaust has caused the drop, possibly air flow meter but no codes coming up. Ecu reset & same bhp figures.

Any ideas / suggestions..?

 

[PawnSacrifice]

wills, I wouldn't worry about it - dynos vary wildly, although most tend to flatter - chap who did mine said he once did the baseline test for a BMW race series and a lot of guys complained he was lowballing them - they had achieved much higher figures elsewhere.

Not sure what the 3.0 should be, but it's within 10%. To be honest you really needed a before dyno on the same setup done by the same guy (even how they strap the car down can make a difference) for this to be relevant.

I'd be most concerned if there were any major peaks or troughs in the power curve.

 

[aquazi]

Well dyno test not great news; just 242bhp at engine, at wheels around 205...! Shall post exact figures in a new topic later today.

242 isnt bad.... my car produced 250 something when it had around 8 k miles....

And dyno's at the crack its all a guessing game with estimates at the transmission loss.

Totally agree with Pawn.. you woul dneed before and after dyno's and check if the exhaust has effected the power delivery more then the overal power.

 

[wills]

Thanks all. Not great pics of printout - 2nd run was slightly lower bhp at 241.3, and torque at 233.9.

No mention of bhp at wheels but he said just over 200 which seemed a little low...

I'd best start a new thread..!

 

[Exactmax]

I thought I would post some pictures of the exhaust fitted from below:-

I couldn't see why the exhaust drones so much at around 3000RPM, its been mounted properly and isn't touching the car anywhere

 

[wills]

Have they taken out the rear boxes completely? I'm no expert but based on my quad I think droning is just something you'll have to get used to with that set-up.

Mine was tweaked with more supports etc, droning slightly improved but still there.

I hope someone has a solution for you, but in the meantime enjoy - I'm sure it looks & sounds great.

 

[cj10jeeper]

Exactmax- well sorry to say but that doesn't impress me as a system. Lots of straight bits if pipe, no silencers and limited bends to match the undebody contours and profile. I bet it's loud.

 

[bmwZ]

This is mine Custom builded from a ESS muffler I could not feel any difference in power. The exhaust muffler when original gave me 9rwhp on a dyno, but thats because I have a supercharger

 

[wills]

This is mine Custom builded from a ESS muffler I could not feel any difference in power. The exhaust muffler when original gave me 9rwhp on a dyno, but thats because I have a supercharger

Now I'm depressed - v nice..!!