Measuring stock exhaust restriction

[RobBeck]

Be interesting to see how those things look internally.

Rob

[Multiades]

Originally Posted by FWombat

....and, it looks like these folks sell a dual port actuator upgrade for the Starion/Conquest...

http://www.racetep.com/starturbo.html

No, no... the dual port (actually, I think it might be triple port - two nipples on one of the diaphragms) is STOCK on StarQuest turbos. I just don't think it bolts up to the 14Bs we have (or anything else with DSM clocking).

From turbochargers.com (Starion/Conquest 14G):




EDIT: it looks like 45-degrees clocking is enough to fix it (see DSM 16G above), assuming the bosses on the compressor housing have the same spacing as the actuator. That might IMPROVE the direction of the compressor outlet, but might also put the wg actuator into the firewall...

If a Starquest compressor housing used a DSM wasteagate actuator (with custom clocking), it looks like J-pipes (and outlet adaptors) wouldn't be necessary at all.

[Boostaddict]

Those starion 14g actuators look like exactly what I'd like to try on my rear 16g. I've been running with a stock tdo5 actuator up front and a tdo4 actuator in the rear with an external helper spring. This current setup surges above 25psi (bad thing). I'm planning on switching to a pair of t3/t4 actuators if I can't find something else to fit. The way I'm running my 16g's (rear clocked upwards rather than down) I have no room for a rear actuator much bigger than the stock tdo4 (tdo5 is just a little too big). Time to cut a hole in the firewall I guess...

Wayne

[Kibwe Walker]

Free bump to a good thread.

I did my exhaust a couple of days ago and good lord did the thing wake up.

Full 3" split to 3" on both sides to two glass packs and 4" circular tips all stainless.

Deep rumble at idle and cruising speeds and loud at WOT.

Sounds alot like a BORLA. Anyways, no other changes and the car just flies, much harder than before.

I have to wait till it warms up to go at it again with a logger because it has been really cold around here as of late and TC'ed cars love cold air, so I know some of the effect is from the straight through plumbing and some is from the cold weather. I need to get a feel for it without the cold weather to see how much is just from the exhaust but that 6k-7k area seems to really like the new exhaust.

[Gamerse]

This is an independent backpressure chart pulled from Garry Donavan's sight.
http://www.thedodgegarage.com/ He's geared towards 2.2 and 2.5 4cyl chryslers, but all of it can be applied here. His 9 second K-car says so.


"Straight through designs with no baffles or louvers to obstruct the flow are the best. Flowmaster or "path" mufflers should be avoided if possible. Check out the backpressure chart below to see how some popular mufflers perform in a backpressure shootout. "

[DoctorDex]

I did some testing of my own using a drilled out O2 sensor and a pressure gauge plugged into the rear O2 housing.

With gutted precats, a 3" downpipe (2 x 2.5" flowing into 3" pipe), no cat and 3" piping back to the stock catback with DR650Rs at 24 psi (dropping to 21 psi by redline), I am seeing 9 psi of back pressure. This isn't quite as much as I had hoped, but I think its still worthwhile replacing the stock exhaust. I figure the reason for the discrepancy between FWombat's numbers and mine is because he has a Td05 setup whereas mine is Td04.