New "Y" piece for V8S
Discussion
Just had one fitted today its a new design.Basically if you look at your existing "Y" piece you will probably see one bank of manifolds pipe meets the other at 90 deg.
The new design blends both pipes together and uses different size pipes (not obvious)
The result is a bit more power and a bit more torque and more noise
not the sound of baffles removed more SEAC quality IMHO
So to get a new one contact "2sheds" of ACT, only 6 bolts to undo and one clamp
Corrected figs were.... 232bhp and 260.1 lbft
Corrected figs are now. 238bhp and 263.4 lbft
knock of 44bhp for power at the wheels
Sorry cant give sound figures
All work done at Austec,and very well done too.Would have done it myself but needed the RR figs for Tim
Next service and re chip
Edited to say top down driving all the way home
>>> Edited by Pies on Thursday 27th November 14:51
The new design blends both pipes together and uses different size pipes (not obvious)
The result is a bit more power and a bit more torque and more noise
not the sound of baffles removed more SEAC quality IMHO So to get a new one contact "2sheds" of ACT, only 6 bolts to undo and one clamp
Corrected figs were.... 232bhp and 260.1 lbft
Corrected figs are now. 238bhp and 263.4 lbft
knock of 44bhp for power at the wheels
Sorry cant give sound figures
All work done at Austec,and very well done too.Would have done it myself but needed the RR figs for Tim
Next service and re chip
Edited to say top down driving all the way home
>>> Edited by Pies on Thursday 27th November 14:51
Good to see Colin, shame I've got the one with the welds all over it whilst we got the shape right, so you could have a pretty one that fitted first time 
.
Top figures for a standard car btw, double checked with Austec who confirmed even before the New Y piece, yours is a good 30bhp stronger than most 4ltrs.
Harry
PS TimW if your on-line, tell mum I'm just leaving now, the battery on the mobiles dead
. Top figures for a standard car btw, double checked with Austec who confirmed even before the New Y piece, yours is a good 30bhp stronger than most 4ltrs
. Harry
PS TimW if your on-line, tell mum I'm just leaving now, the battery on the mobiles dead
Full data including graphs can be found here
The old "Y" piece
The new performance "Y" piece
As you can see the pipes are now blended into the exhaust.This is why it now sounds so much better as the gases can escape quicker.Note pipe diameters have also been altered
As can be seen from the graphs torque curve has a slight increase but a drop at lower levels.It is suspected that this is ue to overfueling to compensate for the naff "Y" piece.
The car will be remapped/rechiped in FEB this should hopefully realise the new potential of the "Y" piece.
Further Tim has a new manifold for the V8 engine which increases power as well
Edited to add another pic
>> Edited by Pies on Friday 5th December 19:58
The old "Y" piece
The new performance "Y" piece
As you can see the pipes are now blended into the exhaust.This is why it now sounds so much better as the gases can escape quicker.Note pipe diameters have also been altered
As can be seen from the graphs torque curve has a slight increase but a drop at lower levels.It is suspected that this is ue to overfueling to compensate for the naff "Y" piece.
The car will be remapped/rechiped in FEB this should hopefully realise the new potential of the "Y" piece.
Further Tim has a new manifold for the V8 engine which increases power as well
Edited to add another pic
>> Edited by Pies on Friday 5th December 19:58
Colin, how many runs did Paul do post fitting of the bits 
. If only the one, then I'm not so sure that that second graph isn't wheel slip/spin below 3800rpm . Particularly as you say it smoother to drive, looking at the plot I wouldn't have thought so .
Only say that as mine gained throughout but the peak gains were lower down.
Harry
. If only the one, then I'm not so sure that that second graph isn't wheel slip/spin below 3800rpm . Particularly as you say it smoother to drive, looking at the plot I wouldn't have thought so . Only say that as mine gained throughout but the peak gains were lower down
. Harry
I only said it, as it could have been swaying on the rollers and bedding in befoire going straight, which sometimes happens for the first run when set down into the rollers.
I do agree though its higher up the RPM is where you would expect to see it.
Was there only the one run after though, you never know though, says Harry the optimist
.
Harry
I do agree though its higher up the RPM is where you would expect to see it.
Was there only the one run after though, you never know though, says Harry the optimist
. Harry
Pies said:
It was only the one run Harry, but it was flaming on the way up 
>> Edited by Pies on Friday 28th November 20:52
Ah good shouldn't flame on the way up the revs normally just the overrun, so definately over fuelling then IMHO, hence the strangling of the lower down torque. Just shows how much fuel the existing chip has to put in to over come the ineffeciency produced by back pressure/waves of the original 'Y'(T
) peice. Do you know if Paul can adjust the exisitng fueling map or are you going to got he whole hog and get a better one
. Harry
misfires can still could be caused by over fuelling though 
Harrycar is running very well,can wait till Feb as drive is still a bit of a mess after being rebuilt (approx half mile) so the old girl is not comming out to play much at the mo.
Infact im using this time to tidy up the car ,i've started by doing the easy job of removing the switch dash.What a ***king abortion of wiring behind there.
ill get some pics of how to get the plate of and get the switch out for a clean if anybody thinks it might help (S3/V8)
,can wait till Feb as drive is still a bit of a mess after being rebuilt (approx half mile) so the old girl is not comming out to play much at the mo. Infact im using this time to tidy up the car ,i've started by doing the easy job of removing the switch dash.What a ***king abortion of wiring behind there.
ill get some pics of how to get the plate of and get the switch out for a clean if anybody thinks it might help (S3/V8)
Pies said:
Harrycar is running very well
Infact im using this time to tidy up the car ,i've started by doing the easy job of removing the switch dash.What a ***king abortion of wiring behind there.
ill get some pics of how to get the plate of and get the switch out for a clean if anybody thinks it might help (S3/V8)
Firstly............1/2 mile drive
so that it'll be parking for 100 cars then Re the wiring behind the lower panel plate, my stereo has never worked properly since I had that lot out
. Not that I listen to it 
I only noticed it when I wnated a bit of music whist working in the garage
. I really do wonder if you just had ashitty run hence he plot thoguh, which is why I asked whether you had the more than one at the time.
Harry
Gassing Station | S Series | Top of Page | What's New | My Stuff