AGK512 Posted October 7, 2006 Report Share Posted October 7, 2006 Glad to hear you are back rs32 So your setup over oem is now the miltek backbox and remap ? Link to comment Share on other sites More sharing options...
rs32 Posted October 7, 2006 Author Report Share Posted October 7, 2006 [ QUOTE ] So your setup over oem is now the miltek backbox and remap ? [/ QUOTE ] yes SA - Milltek cat-back with APS stage 1 remap. I originally did the Milltek Manifolds/Cats as a fix to the boominess at 2-2.5k revs. To be fair to Milltek the boominess vanished but unfortunately the driveability suffered so this setup could not continue. An interesting development this afternoon. Given that I cannot reduct the boominess by using extra Milltek parts without losing performance, I have used some initiative and in true TSN style may have found a fix. See the attached pic. For 25 quid I have obtained a four foot square section of Dynamat (as per the stereo install). By using the highly scientific method of "tapping" the spare wheel well and fixing small sections of the dynamat onto the areas that vibrate the most, the metal boot floor no longer resonates when "tapped". So I went for a fairly *cough* hot drive, then tried 6th gear at 60mph (exactly the right conditions for the boominess problem) and lo and behold the booming has all but gone. The exhaust still sounds gruff and bassy in these conditions but the deafening boomy sound just doesn't seem to be as bad. It may take a little more dynamat to completely solve the problem, but have only used around half of the 25 quid roll so plenty more left. Link to comment Share on other sites More sharing options...
RedRobin Posted October 7, 2006 Report Share Posted October 7, 2006 ....Gosh, Rich! That looks very high-tech! Positively space-age! Link to comment Share on other sites More sharing options...
rs32 Posted October 7, 2006 Author Report Share Posted October 7, 2006 Hi Robin - it's efffectively sticky-back plastic with an aluminium coating and a rubber compound that provides the sound-deadening properties. it's what gives my sound system the "thump" without distortion - a must for any serious install. Link to comment Share on other sites More sharing options...
rs32 Posted October 7, 2006 Author Report Share Posted October 7, 2006 your post encouraged me to explain more Robin .... In the first pic you can see the MkV R32 boot layout as a cross-section - note the wobbly red line which is the sound vibration from the rear silencer. In the second pic the dyanamt (in smaller sections as per the previous pic) is stopping the boot floor acting like a speaker - the metal floor has to reproduce the sound of the exhaust but cannot do so properly because it's a lump of metal. All the "space age" stuff does is make the sound between exhaust, heat shield, air gap and boot floor (all of which could change and/or amplify the exhaust note when hot) penetrate the cabin less. Put simply it has stopped the boot floor acting like a speaker. Less "speakers" in the cabin means more natural sound - whether from your car audio or other factors e.g. the engine/exhaust. Conversely the exhaust rasping sound (from the downpipes between manifold & cats) has now increased because I am not hearing as much of the impromptu boot "speaker". Link to comment Share on other sites More sharing options...
RedRobin Posted October 7, 2006 Report Share Posted October 7, 2006 ....Nicely and clearly illustrated . So, are you now saying that you need to do something about the front end "rasping"? Could be a bit like shaving a table leg....Never ending fixes until you've got a legless table! Link to comment Share on other sites More sharing options...
rs32 Posted October 7, 2006 Author Report Share Posted October 7, 2006 [ QUOTE ] So, are you now saying that you need to do something about the front end "rasping"? [/ QUOTE ] Not at all - with the rest of the car sound-deadened, the engine is the only sound you get even with plenty of other traffic flowing by. The Milltek cat-back sound is like the OEM version but louder. There's also the bonus of the performance matching the sound - 4th/5th gear are rapid when pushed Link to comment Share on other sites More sharing options...
RedRobin Posted October 7, 2006 Report Share Posted October 7, 2006 I'll chat to you about this when I see you at the Brighton meet . Up early for the F1 GP. Link to comment Share on other sites More sharing options...
Oli Posted October 8, 2006 Report Share Posted October 8, 2006 Excellent right up chaps Good old Dynamat. Link to comment Share on other sites More sharing options...
Jim_Cross Posted October 9, 2006 Report Share Posted October 9, 2006 Is the Mk IV boot constructed in a similar way, such that some cunning dynamatting in the right places should reduce the boominess as well? Link to comment Share on other sites More sharing options...
khutula Posted October 18, 2006 Report Share Posted October 18, 2006 [ QUOTE ] khutula - try the cats and see what they do for your car. [/ QUOTE ] I have just booked my car in at Awesome to have the cats changed on November 10th. Milltek are just about to make some more that will be available that week Can't wait. Link to comment Share on other sites More sharing options...
ChrisBuer Posted October 18, 2006 Report Share Posted October 18, 2006 Isn't there a known issue with fitting the Milltek cats to the R32? RS32's previous posts have highlighted on problems encountered when having these fitted. He noted a loss it torque and power once the cats were installed and has since taken them off. I'm not sure if you have a MKIV or MKV R32, but I think this only applies to the MKV. Anyway, best of luck Link to comment Share on other sites More sharing options...
khutula Posted October 18, 2006 Report Share Posted October 18, 2006 Mine is a MKIV - so I don't believe the loss of power will occur. Link to comment Share on other sites More sharing options...
rs32 Posted October 18, 2006 Author Report Share Posted October 18, 2006 the confusion here is down to my post title I fear - I cannot comment directly on the MkIV having never owned one but there are many members on here with the cats on their MkIV's, I believe with no reported problems. MkIV owners - the loss of torque and introduction of a flat spot relates to a MkV R32 with the Milltek sports cats / manifolds. I have not been testing any new products for the MkIV. Link to comment Share on other sites More sharing options...
Mook Posted October 18, 2006 Report Share Posted October 18, 2006 [ QUOTE ] Mine is a MKIV - so I don't believe the loss of power will occur. [/ QUOTE ] You'll gain about 8 bhp and 6 lb/ft of torque adding the Milltek hi-flow sports cats to a Mk4 R32 which has been remapped. AmD Stage 2 remap plus cat-back Milltek 270 bhp. Add the sports-cats 278 bhp. Two separate cars, same upgrade. Neither of them are that spec any more though... I don't get any flat-spots and know that Helfinger (who used to run the ST4 conversion before he went supercharged) didn't either. Link to comment Share on other sites More sharing options...
khutula Posted November 13, 2006 Report Share Posted November 13, 2006 [ QUOTE ] khutula - try the cats and see what they do for your car. [/ QUOTE ] Well I had the cats fitted on Friday along with a few other goodies at Awesome-GTI. So far I am very very impressed. Combined with my straight through CAT back the sound is amzing. Less boomy on the motorway but when you step on the pedal a lot more growl. The car seems to be more responsive as well. I just love my car. The cats that were taken off the car were in tact unlike Dan32's I will run the car like this for a week or two and then I am going to get the REVO stage 2 remap. I must say that this is the second time that I have used Awesome and their service is fantastic. Link to comment Share on other sites More sharing options...
vindaloo Posted November 13, 2006 Report Share Posted November 13, 2006 [ QUOTE ] I must say that this is the second time that I have used Awesome and their service is fantastic. [/ QUOTE ] I agree with you, I was there last Thursday for an oil change and a Haldex upgrade. Very pleased with the service and attitude Link to comment Share on other sites More sharing options...
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