I just finished swaping the 18.5 with the 16 cm housing which did absolutly nothing to my truck, in fact i could get 17 psi of boost before now it will barly hit 15, egt went up about 100 degrees and now sits at 750 @65 mph (after turbo) whats happening here it seems everyone has had awsome luck with the 16 , do i now need to adjust my pump? i was getting 21 mpg with the 18.5 and my current setting kinda scared to turn it in more. but if milage wont change i will go for it, any ideas here guys would help you have always came though for me HELP!

one strange this is that my 18.5 looks exactly like the 16 no visable differnce that i can see????? the 18.5 is clearly marked

And i must say piers in surry is awsome, great people and very fast thanks mark!!

Thanks guys

 

Did you lose the o-ring that goes between the compressor outlet and the elbow? Sounds to me like you have a leak somewhere.

The 16 compared to the 18 is not a spectacular change, but you should pick up a couple psi.

 

well don't really know but those egts are high in my book, i run that or less crusing at 65, preturbo.

 

something's up... sounds like you've got a boost leak or something.

Forrest

 

A couple stupid questions.
1) You did put a new gasket on between the manifold and exhaust housing?
2) Did you lose the oring between the compressor housing and the elbow that turns toward the intercooler? Even if you did not lose it, it can leak. Mine did when I put my 16cm housing on. I had a drop i boost. Replaced that little rectangular o-ring and immediately picked up 5 psi ove where I had been with my 21.

As for the EGT's, I don't see 750 unless I am cruising at 85-90mph or going up hills. I like cruising down the freeway at 75 with EGTs of 625.

Carl

 

I'll echo the thought's on the square cut o-ring connecting the compressor housing to the outlet elbow. Sometimes the thing gets squashed over time, or, you may even hav pinched it when you did the re-install.
Also check you manifold bolts for re-torque...break each one loose and re-torque to spec.
A change of one housing size down will usually create about 2 - 2.5psi more boost...that is variable depending on pump setup of course but that is a pretty average result.
Also, your EGT's which you say are POST TURBO are too high for you numbers.
With 15psi boost add about 10*F for every 1psi boost, to your EGT guage reading...so, in your case you're reading about 750*F plus 150*F which is a bit too much for your setup I would think.
I'm heavily fueled even though I'm dialed back for winter but I don't see that kind of EGT on my truck when travelling at the speeds you mentioned....the suspicion is boost losses on this one I think.....guys !!!

pb...

 

I'll echo the thought's on the square cut o-ring connecting the compressor housing to the outlet elbow. Sometimes the thing gets squashed over time, or, you may even hav pinched it when you did the re-install.
Also check you manifold bolts for re-torque...break each one loose and re-torque to spec.
A change of one housing size down will usually create about 2 - 2.5psi more boost...that is variable depending on pump setup of course but that is a pretty average result.
Also, your EGT's which you say are POST TURBO are too high for you numbers.
With 15psi boost add about 10*F for every 1psi boost, to your EGT guage reading...so, in your case you're reading about 750*F plus 150*F which is a bit too much for your setup I would think.
I'm heavily fueled even though I'm dialed back for winter but I don't see that kind of EGT on my truck when travelling at the speeds you mentioned....the suspicion is boost losses and/or poor grade fuel on this one I think.....guys !!!

ps: you should add a good healthy dose of cetane improver to your tank and after about 1/2 to 2/3 of a tank you should see some results.

pb...

 

boy, you weren't kidding!

 

Does the dodge dealer have that o-ring?

 

Well... wheel I just took the clamp off the bottom boot going to the intercooler never disconected it form the elbow so dont think thats the problem and also installed a new gasket ont he manifold , I defently am lossing boost somewhere though becasue i turned my pump up another 3/4 turn and it did not change the boost level or egts which i thought was strange but the truck reacts awsome now with the 16cm spools way faster so I am happy in that matter, how do you do a leak check?? think thats whats on the list now, and does any one have a part number for the o ring might as well replace it so its done,

thanks for the help so far guys

 

go to home depot and get a 4" rubber cap for pvc pipe. put a schrader valve in it soo that you can pressurize the cold side piping... use a spray bottle w/ some soapy water and start lookin' for leaks.

Forrest

 

What Forrest said. Keep the pressure around 25 psi, that's high enough to find leaks but low enough that you won't blow the intercooler.

 

im a tard, but wouldnt you need to cap off the other end to test the I/C system. cap off the intake side get the smaller *isnt it 2" for the lil I/C boots* then put the scrader valve there to presure test? i havent dont this but i want too. jiMMy

 

Not enough leaks by the 1 cylinder that's on overlap to matter. Your compressor will be able to keep up.

 

huh