Exhaust Housing Guru's?

[Cummnzpowr]

any advise from the pro's here... . how much more will a non-wastegated 18. 5 cm housing provide in air-flow & cooling than a stock 12cm?---i'm already making 40 lbs boost on the12cm... will the 18cm just go ape and make 50 and blow intercooler hoses off? and will it get me out of the 1500 degree range on the temps?

 

[BPINE]

Greg the larger housing will make less boost than the 12 and will lower you temps some. I have found no exact formula as all trucks seem to be a little different but probably about 150 to 200 degrees.

 

[MDW]

Need more info??? Year? 12 or 24?? Mods?? 5spd or auto??

 

[HVAC]

Greg,



Go with a 16cm2 housing. The 18 is too doggy off the bottom.

 

[BPINE]

That is true Nowel but I think Greg likes the word free better than doggy!!! LOL

 

[redram]

What about a 14 cm turbo housing on a 96 5 spd?



Good upgrade for a stock truck?

 

[Joseph Donnelly]

The 14 lowers egt about 100 deg; the 16 or 18. 5, about 200 deg if the rest of the exhaust system is high flow (like straight through muffler in 3"). Spoolup is fastest with the 12, then 14, then 16, etc. Going from 16 to 18. 5 cuts total boost a bit, but the 18. 5 may be cheap or free from a first gen truck. The 18. 5 will either spool slower than the 16 or make a good bit more smoke spooling at a similar rate if you fuel it heavily.



Most folks go to the bigger housing when egt dictates, and the 14 is a compromise to keep some spoolup especially with the electronic afc of the 24 valve. Being generally wastegated, the 14 is an easy fit on the 2nd gen, but costs more than the non wastegated 16 or 18. 5.



Becasue the outlet is still 2. 4-2. 5" diameter, there is a limit to the size increase of the housing that will help egt. 16 seems to be it, and the 18. 5 doesn't help any more than the 16 on egt.

 

[redram]

Thanks Joe,



What about the non-Wastegated versus waste-gate?

There are two non waste gated housings on ebay, one 14 one 16 and was jsut curious as to the performance gains.



The search feature is down and could not do any serious research of the list.

 

[drawson]

I ran the 16 CM2 housing for quite a while, it did drop my EGTs but then I added more fuel and I was right back where I started from(maybe alittle hotter). I did the 16CM2 housing at the same time I did my 370 HP injectors and didn't notice any lag at all. What lag there would have been was taken care of my them 370s. I was running into some problems right at last with the 16 CM2 housing, because there was no waste gate my boost levels where higher than I liked to see. I was seeing 45 regularly and had it as high as 48 on one hill. That is where even though you have alot of boost it doesn't do you any good because it's too far outside of the map of the HX35 turbo. I was smoke really bad even at these high boost numbers. Installing the Pier super HX40/16 turbo the smoke was almost gone at only 38PSI.



If you have this bombahalic addiction like some of us there probibly won't be a big enough turbo or anything else to keep the EGTs in check:--) Oo.

 

[BPINE]

If you have this bombahalic addiction like some of us there probibly won't be a big enough turbo or anything else to keep the EGTs in check.





Amen drawson now you are telling it like it is !!!!!! But we will keep up the quest.

 

[HVAC]

EGT's

Drawson, think Oo. Oo. twins

 

[BPINE]

 

[drawson]

Nowel, I hope to see your up and personal at the Stampade in July.





OK twins are in my furture, but I want a camshaft first.

 

[HVAC]

I'll be the first to admit that twins on a 12v are more fun and more effective then they would be on a 24v. The reason being is that with an extra 1000 rpm worth of exhaust gasses the turbos are really humpin'. It's like you have an extra gear kinda. Your peak boost level is childs play to achieve. The trick is to transition from drivability to race mode.

 

[Joseph Donnelly]

Whether you should use a wastegate depends on the horsepower/fueling level. The non wastegated 14 is good to around 300 hp and the 16 to 350. Above that, the HX40 should be used anyway due to need for more airflow than the HX35 outlet gives.

 

[M Barnett]

Joseph, reading my signature, do you think the HX40 would be right for my truck? How would the spoolup be? Would it help clear up some smoke? It spools fast now with the little turbo, but of course it heats up.

Thanks

Michael

 

[Forrest]

I'll bet the twins don't sound good.

 

[Joseph Donnelly]

The HX40 with 16 cm2 housing would work fine if you get a stronger torque plate

Contact me off line if you wish, for more info.

 

[Paul]

When should the 14cm wastegated be used VS. the non-wastegated?

I have a 16cm non. and wondering if I would be better with one of the 14s.

The 16 works great for towing but hurt my fuel mileage alittle around town.

 

[Joseph Donnelly]

Paul, if you are pushing too much boost, the wastegate helps keep you in the safe boost range, and where the compressor side is efficient and not overheating the boost air. I'd prefer the wastegated 14 overall but it is expensive, unless you find a used one [rare but I have one ]. Actually, the 14 only helps egt about 100 deg. so it is not much of an improvement. It is a compromise mostly useful for 24 valve engines with their electronically impeded afc system. Most people really need more than a 100 deg. reduction in egt by the time they get around to considering another turbine housing. The 16 can give more lag than some folks want, though.