+- STD (https://www.superturbodiesel.com/std)
+-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6)
+--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7)
+--- Thread: straight pipe 617? (/showthread.php?tid=3856)
straight pipe 617? - Gearbound - 08-19-2012
Well i never thought id get to like this w123 300td but it growing on me...needless to say i like the sound of a diesel and the mufflers arent helping the raw sound of the turbo...so i know the mufflers and resonators are infact just straight threw with some holes that plug up nicely. so i figured why not replace then with same diameter pipe and put a turn down on it or a 3'' turn down
questions:
-it is worth it??(if i hear turbo whistle then yes)
-does it degrade performance
-why not have it just shortened and dump out right infront of the rear tire or behind the front one?
Thanks!
RE: straight pipe 617? - Simpler=Better - 08-19-2012
(08-19-2012, 01:48 AM)Gearbound Well i never thought id get to like this w123 300td but it growing on me...needless to say i like the sound of a diesel and the mufflers arent helping the raw sound of the turbo...so i know the mufflers and resonators are infact just straight threw with some holes that plug up nicely. so i figured why not replace then with same diameter pipe and put a turn down on it or a 3'' turn down
questions:
-it is worth it??(if i hear turbo whistle then yes)
-does it degrade performance
-why not have it just shortened and dump out right infront of the rear tire or behind the front one?
Thanks!
Have it just shortened and dump out right in front of the rear tire or behind the front one! 3" if you have the time and money, I cut up my stock exhaust to make the side exit, and drilled & mounted an exhaust hanger to teh rear footwell
That's an order! You will need to install a boost controller or adjust your wastegate to adjust for the new exhaust pressure post-turbo. Besides the weight loss a straight pipe will drop your EGTs around 100*
RE: straight pipe 617? - sassparilla_kid - 08-19-2012
Its definitely worth it, boost will build quite a bit quicker = more acceleration, and the car will sound more awesome = more acceleration
RE: straight pipe 617? - larsalan - 08-19-2012
<thread hijack>
I love my straight exhaust but in the interest of always modifying stuff..
I was wondering if it would be any use to shape it like those fancy tips they're putting on pickups nowadays.
You know where they have like fins, slots, slits or whatever in them so they seem like ram air or whatever would help scavenge off exhaust.
like this is one kind, you can't see it in the pic but where the front of that tip is open and would have fresh apparent wind scavenging exhaust fumes out.
or so I imagine
![[Image: 07_SilveradoDmax_terminatorlugs.JPG]](http://0.tqn.com/d/alternativefuels/1/0/r/6/-/-/07_SilveradoDmax_terminatorlugs.JPG)
</thread hijack>
RE: straight pipe 617? - rmd2k1 - 08-19-2012
The "fancy tips" they are putting on trucks now, like the Gm duramax exhaust you have pictured are for helping cool the exhaust and exhaust gases when they perform a regen of the diesel particulate filter.
As far as straight piping the exhaust I would say go for it. I did a 3 inch exhaust from the down pipe back and had it exit in front of the left rear tire. I have to clean the rim every so often but that's easy to deal with for the sound and bit of performance difference.
RE: straight pipe 617? - fordheaded - 08-19-2012
In the interest of saving money,I decided to make my own stainless exhaust. First one was straight through 2.5" with a 3" for the last 3 feet and a downturn. All sanitary pipe, since I saved it from the scrapyard. Drove that for 2 weeks before the drone at 70mph got to me. Had to put a resonator in line,(made that too) to bring the noise to a different quality. Drone at 70 is tolerable now, but the volume is just so cool on the freeway, plus upper end performance improvement increased remarkably!!!! i'd say go for it, you won't regret it!!
RE: straight pipe 617? - willbhere4u - 08-20-2012
They use these exhaust tips to cool the exhaust to help cut down on grass fires.
RE: straight pipe 617? - Gearbound - 08-20-2012
Simple=better
so how about i make it 3'' after stock downpipe and side exit infront of rear passanger? i'll have an exhaust shop install it so it will be faster-cheaper if they just cut it off from the DP and go 3'' back.
As for the Manual boost controller and egt where did yall get those nifty 3 gauge pods for on the dash that have egt,boost,and __?__ gauge
This w123 is still stock other than alda back out and a vacuum line missing to the transmisson and also missing vacuum lines to egr.
Thanks for the responses!!
RE: straight pipe 617? - Simpler=Better - 08-20-2012
A VW gauge pod will give you 3 spots for gauges where the ashtray used to go (no idea on part number or source)
You can always cut out two circles from the ash tray cover and make it into a gauge pod.
The ones that go on the dash are generic-you can get them on ebay.
The cheapest straight pipe route is to have the muffler shop replace the resonator and muffler with sections of pipe
RE: straight pipe 617? - Gearbound - 08-20-2012
and the egt,boost gauge? im going to get the resonator and muffler replaced now. when i get back ill order the manual boost controller and the egt u recommend.
RE: straight pipe 617? - Simpler=Better - 08-20-2012
There is a plugged port near the back of the intake manifold, it's got a british thread but a NPT 1/8 will fit.
If you can take the turbo off it's best to put the EGT probe pre turbo, then you can safely start playing with the pump.
RE: straight pipe 617? - bryant.cw - 08-20-2012
Huh, I always figured those 'fancy exhaust tips' were just so that if you were on the job site and backed into some dirt or something it wouldn't plug the exhuast.
I straight piped my 617a swapped G wagon. 2.5" the whole length, exits out the back like normal. Sounds throaty but not crazy loud and yes you can hear the turbo whistle. I originally had the exhaust only about 3 feet long from where I cut it off of the donor car before I got to the exhaust shop. The turbo whistle was much louder, but god it sounded awful. Droney and stupid loud. I wouldn't make the exhaust too short if I were you.
http://www.egauges.com/vdo_ind.asp?Type=Turbo_Boost&Series=Vision&PN=150-1042 This is a good gauge and comes with the fittings you will need.
RE: straight pipe 617? - Simpler=Better - 08-20-2012
My stock Garrett turbo took like 5 years to spin down, it sounded amazing. It would honestly freewheel AFTER shutdown if I gave it a quick spin before shutdown.
RE: straight pipe 617? - Gearbound - 08-20-2012
Well i had them cut off the exhaust back to where the E-cable has the adjuster in the driveshaft tunnel back and i kept the muffler, there was no resonator(so i was told) and 3'' exhaust welded up to dump infront of drivers rear tire. so its like 3.5' of 3'' and the rest is the stock system.
results:
loud,obnoxious,sometimes deafening,draws lots of attention, off idle smoke more noticeable.
Its not bad if your screwing off and want noise and SOME
turbo spool, which it will continue to spool("freewheel") for a good 30-50 seconds after shutdown. no significant performance results. i have not drove any interstate yet for sustained upper rpm for the "drone" that it may have now. but it sounds wicked when u hammer (L) range then bump it to (S) range on the transmission.(I dont think kickdown s/w works) no idea on rpms due to the tach dont work but id guess 4600-5000 it sounds like a big motor.$51 for one boost gauge? yikes!
RE: straight pipe 617? - Simpler=Better - 08-21-2012
(08-20-2012, 11:52 PM)Gearbound loud,obnoxious,sometimes deafening,draws lots of attention,
no significant performance results.
$51 for one boost gauge? yikes!
If it's too loud a turndown tip or a little bit of baffling might help, or both
You won't notice any performance gains until you add a boost controller. You can make one pretty cheaply, or just buy one for like $15 on the bay
I for a VDO boost gauge with tubing for like $30, look around on eb@y
RE: straight pipe 617? - led-panzer - 08-21-2012
Haha, you would really hate mine, its just a 3" dia turn down 16" long. Sounds like a tank. It is starting to wear thin on me though I've just been too lazy to take it and get the exhaust done
RE: straight pipe 617? - sassparilla_kid - 08-21-2012
(08-20-2012, 11:52 PM)Gearbound 3'' exhaust welded up to dump infront of drivers rear tire.
If it went out the back with a turn down tip it would be MUCH quieter!
RE: straight pipe 617? - Gearbound - 08-21-2012
And the egt? so the boost controller...what size line from the british fitting on the intake manifold to the gauge?