Engine/Transmission (1994 - 1998) New 16cm Housing- Now hotter temps

[Tom C]

Put a 16cm housing on tonight to help with egt's and now I have extream egt's



temps at cruising speed went from 650 to 900 (70mph in OD on level road with no wind).



full throttle egt's went from 1450° to pegging the gauge.



throttle responce now feels like a Ford Pinto. It takes its time spooling up.



and power will not slip the clutch, which it would before I put on the 16cm housing.



My current plans are to remove the 16cm @@#%$$%%$# and put the stock housing back, then modify to a 4" exhaust.



Anyone else had this happen????





Tom C





PS: boost pressure is the same as before with a max of 32PSI

 

[rjones]

My temps didnt get any better with the 16cm either..... and slower spoolup

 

[Forrest]

you might want to give Piers a jingle. he does some pinwheel matching & machining of the inside of the housings to match.

 

[Jim Fulmer]

My temps didnt get any better with the 16cm either..... and slower spoolup



Did you check drive pressure, it for sure went down so EGT's should have.



Jim

 

[markdixon]

I have 16 cm exhaust hsg and these are what I have seen on my truck. At 70 mph and 2500 rpm boost with the 12 cm was at 11psi and temp were around 675 to 700 deg with the 16cm hsg boost went to 8 psi temp were 700 to725 Wide open throttle boost went from 38 psi to 32 psi and the temp climed slower. Do you think you mite have hit the pin wheel when you changed the houising or created an air leak on the hose to the inter cooler. Just a few thoughts I remember when i did mine the pain it was to remove and reinstall.

 

[rjones]

Originally posted by Jim Fulmer

My temps didnt get any better with the 16cm either..... and slower spoolup



Did you check drive pressure, it for sure went down so EGT's should have.



Jim

Are you talking the boost pressure or the back pressure?

 

[moparguy]

Ditto Mark Dixon, the 16 wasn't a magic fix, but it did slow down the temp increase, lowered peak boost pressures about 10 psi. I had been seeing mid 40's with the stock 12cm housing, now see mid 30's with a sometimes peak of 37 or so.



RJR

 

[Tom C]

I double checked all connections. All were tight. I Just got poor performance and more heat. luck of the draw...



I put the stock 12cm back on and its back to like. throttle is again right on tap (there is maybe a 1 sec lag for spoolup). the 16cm gave me a 4 sec lag. temps are back down to 650 at 70MPH and dont get as hot at full throttle. temps with either housing climbed at about the same rate.



For me. The 16cm had no gains. Its just not right for my trucks setup. a 14cm housing may be better. I'll be talking with piers in the AM.



cheers,



Tom C

 

[HoleshotHolset]

Any update on this issue?



I snapped one of the stainless bolts that holds the CHRA to the turbine housing last night on Dad's truck. I heated up the housing around all the other bolts and they came out nicely.



I hope like heck the 16cm² cools his down... . if not - it's time for a bigger turbo.



If anyone's on the fence about whether or not to buy the discharge spacer..... don't even think twice about it. That little spacer is worth its weight in gold - works slick as heck.



Matt

 

[RHARVEY]

I thought the same thing about the 16 cm housing. I had one at the house and was just about ready to replace the 14 cm housing on my PDR HX35. But with the level of fueling that I am now... I would have gotten just the opposite results than what I was hoping for. Instead of lowering my EGTs they would have went up as you found out.

I am just going to hang tight until I can go with a bigger turbo and then move up to the #10 plate and bigger injectors.



Rick

 

[1dslram]

Most of us using the 16cm housing find that the crusing temps go up 50-75* but towing or when pulling a hill temp's drop about 100-150*. If your temp went up that much you might want to check your turbo to manifold gasket that it hasn't slipped and is raising the drive pressure raising the temp's. Also I woud be sure to check for restriction in the exhaust causing the problem. Did you change any fueling adjustments at the same time? is the 1/8 pipe hole in the turbo for the boost line plugged? check for leaking boost hoses. There must be something wrong to cause that drastic of a change.

JMHO

Bruce

 

[HoleshotHolset]

Bruce brings up a good point... .



One of the first things I did was to take out the boost elbow and put in a 1/8" pipe plug on Dad's compressor housing.



That's a sizeable boost leak if that's the case.....



Matt

 

[moparguy]

I had forgotten, but Bruce and Matt are right, you've gotta plug the boost elbow in the compressor housing.



RJR

 

[QRTRHRS]

I have not pulled heavy lately and probably won't since I am in between trailers. So, I can't compare EGT's loaded since I went to the 16cm2 housing. Reading this thread, I put it to the floor on a hard hill today weighing about 8500lbs. Max temp is about 1200 degrees. I can still get 36lbs of boost as opposed to the 38lbs I used to get. I would like to get a bigger turbo some day but for now, I am happy with the 16cm2 housing.



(370's, #11, 3pc manifold, 4" exhaust and BHAF)

 

[Tom C]

Boost line was plugged. Sent the 16cm housing back today. I may try a 14cm waste gated housing but its twice the cost of the 16cm. figures. guess ill save the $$ and do some injectors, turbo and exhaust all at once.



Thanks for the thoughts,



Tom

 

[Reb.B]

i had this problem on a customers truck a couple of weks ago and when we went to the 4" exhuast it was then perfect. My only thought was that there must have been something backed up somewhere else. The 16 is still on and he's happy as can be with egt's

 

[HoleshotHolset]

Interesting... . I'll tell Dad to straight pipe his 3" setup and see if that helps.



I'd hate to think that a 3" I/O Nelson muffler would be that much of a restriction... .



Matt