Don’t know why I bothered posting the graphs.
I mentioned the the idea was to have a better system overall, not just the top end.
There are other things we’re going to try and this is just the situation so far, posted because some people wanted to see them.
Did you get the point of having the extra torque gained from the longer trumpets on the JV exhaust? how can that be bad?
Sorry, but don’t agree on the: stick with what has been proven. If everybody thought like that there would be no progress.
what i like on uldis car is the straight back box that avoids the “S” usual on elises based cars.
What about to combine an EBD with the straight box?
That is also going to be done, just after this first design.
It’s on the pipeline (afetr all not everybody would want to change manifolds as well if they have a good one).
Sorry, but don’t agree on the: stick with what has been proven. If everybody thought like that there would be no progress.
I don’t see anything wrong in trying new ideas and it might be that you find gains that others havn’t seen. It’s worth finding what has been tried to date and not reproducing it though.
My concern about the straight back box is noise. I struggle to keep the noise down and my back box is pretty much as big as can possibly fit the space. Track day limits are hardly going up after all.
It’s going to real hard to get the noise level down to something acceptable with a straight through silencer in the length that you have available. It can’t be much more than 300 mm can it ?
Yeh, I wish everyone would take a step back and read the posts. This is our FIRST attempt - it isn’t even Simon Erland’s engine spec! The exhaust peformed exactly the way I wanted it to; the headline figure was crucial.
Again, I expected the noise to be a disappointment (well, circuit limit-wise anyway). Bernard, the dimensions are in an earlier post. There is room for another silencer (or Cat) but revisions are in hand. It’s all a work in progress and adds to the interest on this forum but if all I get is negativity, we’ll wait (in silence) for the final version to blow you away.
ermmm… guys… I guess there is a bit of a hum-dinger going on over in SELOC about this, but can you please not start repeating it over here – we’re all a bit old and grumpy here and kinda like the quiet life.
There have been some good comments on both sides but as far as I can tell it starts to get a bit less than objective, pretty quickly. Looks to me like JV is attempting to bring some alternative thinking along and is doing it very openly and very publicly we should thank him and applaude him for that - as usual, can i ask that we keep it constructive… at least for a wee while anyway…
Uldis, i for one think that you have built the perfect exhaust for the UCR gearbox, and given it a nice linear torque curve. At the moment my torque peak is nowhere near where i need it as 2nd to 5th drop revs to +/- 6200 RPM which means that the slightest uphill and i have no torque available, and lets face it BHP is nice but thetorque really helps in a situation like that.
You have done some good work and achieved great results for your first attempt and i am sure it will only improve on the overall from here on out.
Now it’s time for my stupid observation of the day, are you not concerned that the exhaust is a litlle close to the driveshaft as it is going to heat it up considerably. Perhaps it is not as close as it seems in the picture, and you could put some exhaust wrap over the final pipe to keep temps down.
Yes, Mike, Ian, I was also getting frustrated communicating people what we’re doing over here. So mouch that had decided stopping posting in those regards.
Can only see it as a group, a clan thing where people that like one flavour tend to stick together, a bit like in football.
But anyway, I’ll continue (even though posting less) and will let you know eventually the final results.
And Jason, I know it looks like in the pictures, but it’s actually just a bit further waya than the EBD. You should see how close the original design (and consequently EBD) is.
In fact, I specifically needed the exhaust to be further because with the EBD I had already melkted the rubber boot that covers the gearchange links (see my posted pictures in bookatrack on the rebuild)
Still, any design is going to be pretty close, that’s why I’m going to wrap it too.
Note that I also wrapped the EBD at a second stage, but since it touches the undertray in several places (can’t believe they made it like that) the wrapping is all torn up and falling in pieces now.
At least this design has some other advantages:
it doesn’t touch anything
it’s below the metal part, not below the rubber
it’s modular, which means for development reasons if a certain length is found to be better (of any of the sections) it can be easily upgraded, and also means that installing/removal is much quicker than any other exhaust.
Last time Jim had it off in what, 18 min?
And, as in any other, it can (and should) be wrapped. At least the wrapping won’t rub against anything.
But still, as I said we will get some more torque back, the target is to get the mnidrange torque of the EBD and the top end of this first one.
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![http://www.briandrought.com/steveb/uldisvsstevecorrectedforemerald.jpg[/image]](http://www.briandrought.com/steveb/uldisvsstevecorrectedforemerald.jpg%5B/image%5D){kind=link}