MAP Effienciency for Turbos--> New 54CM Compressor Wheel is ON (NON I/C)

[pepecat]

MAP Range for Turbos--> New 54CM Compressor Wheel is ON (NON I/C)

I have heard that on Non i/c trucks the stock turbo has a pinwheel of 50cm and a MAP effiency rang topping out at around 26 psi?

Well Now that I have swapped on a 54CM Compressor wheel on there and it sounds like a Jet on takeoff, still non I/C what is the MAP efficiency for a turbo like this? I can't get above 1000 degrees EGT anymore... and this is uphill in 5th gear WOT headed to 100MPH... At Higher Rpms I can hit 27 but it creeps up there. Around town the most I can see from a blast is 20-22 psi. I don't see any smoke, but at night I get a slight haze during turbo lag, but my starwheel is gone. Man this turbo is real loud I can't imagine putting a 60 on there. Prolly just stage 3, so I don't have to swap backing plates.

Cruise egt at 80MPh is down to 550deg and 4psi. This is due to my higher gearing of course, but with the 50Cm egt was 625 or so at 80 Mph. 75mph egt is a little lower as is boost. I am falling in love all over again with these 3. 07's I hope they last.

 

[sdstriper]

I am falling in love all over again with these 3. 07's I hope they last.

They won't(3. 07's) The H1C I stumbled onto is a 52mm inducer, 16cm and the 4" turbo back is ready to go on finally. Gillett Diesel Service has the most comprehensive Dodge specific turbo selection (all years) I have seen online yet. I was going to get the 60mm inducer but I want to swap in a different TC with that SFI before I ruin my 3. 07's...

 

[JLEONARD]

pepecat are you still running the stock crossover pipe?

Jay

 

[pepecat]

Yeah stock crossover pipe.

I got it to fit by taking the flange off the 54cm housing. I got teh stock '92 54cm housing and wheel from a dtr member who upgraded to the 60cm high flow compressor. I used a 2. 5 - 2. 0 Turbonetics high temp/pressure silicone reducer to go from the turbo to the stock crossover pipe.

I think this setup works great on the top end, I would just like quicker low end spooling, I am thinking 12cm WG housing with the divider drilled out with a stage three htt 60cm compressor wheel. I don't want to get above 30 psi @ w. o. t. Let me rephrase: My HEADGASKET doesn't want me going above 30 psi...

 

[Forrest Nearing]

what's wrong with your headgasket?

 

[pepecat]

Nothing yet, and I want to keep it that way

Stock headgasket saftey zone is below 30 psi from what I understand.

 

[Greenleaf]

I wouldn't be concerned about 30 psi at all. Espesially if you have pump timing set properly and warm the engine up well, prior to 30/40 psi.



I'd have to personally say that you have fuel set correctly if you don't see much smoke and only 1000°F It won't take much fuel to surpass the 54mm compressor. Been there before.

 

[JLEONARD]

Pepe... if you're running the stock crossover you are choking down the flow.

I recommend upgrading to 3 inch. Spooling will be about the same, but top end will improve.

If you want to see mine, send me an e-mail.

-- email address removed --



btw I'm running a compressor wheel and housing from a 94 WH1C. I'm not sure if it's a 54 or 56 mm wheel, but it's larger, or at least taller than a wheel from a 92. I'm up over 30 psi, but I don't know how much cause my gage bottoms out!!

 

[Forrest Nearing]

Nothing yet, and I want to keep it that way

Stock headgasket saftey zone is below 30 psi from what I understand.

if it's the same fasteners and gasket as a 2nd gen 12v, I'd add about 10psi too that safety zone

 

[dpuckett]

They changed the head gaskets in 91 with the intercooling. The old style HG isnt as tough as the newer "marine" gasket. I blew mine at 28psi and 240K. If I had kept the timing stock, it might have held... ...



Daniel

 

[pepecat]

JLeonard

Thanks for the advice. What do you mean by stock crossover pipe choking the flow, is the intake not moving fast enough? If I unchoke it with a three inch what will boost and EGT do on the top end if spool will not be effected? I lowered egt's with the 54 over the 50 on cruise and WOT. Plus the turbo doesn't sound like it is screaming anymore, just a more robust lower pitch sound.

 

[Greenleaf]

What Jay means is that the cross over pipe will fit INTO the outlet of the turbo's compressor housing.



Once you form a mental picture of that, no explaination is needed. The other extream would be to form a cross over pipe that is FIVE inches ID. That would slow the air as well.

 

[JLEONARD]

You have a larger compressor wheel now... . and you are trying to stuff all that extra air thru a 2 inch ID pipe. There is resistance to the flow.

Change to a larger ID pipe and the flow (volume) will improve.

When I installed the larger comp wheel and housing, I had a nice improvement but I still had the stock intake pipe.

When I first installed the custom intake system I got some turbo lag but the truck felt sooo much better at higher rpm like in highway speeds. . 70/80 mph. A little pump tweaking go rid of the lag.

I don't know how else to explain it.

 

[Jgolden]

This is a great thread for for people looking for top end power.

Does a larger housing or smaller one make more sense for top end power and safe egt's, with a bigger compressor wheel?

Seems to be mix of opinions, but I may not understand all of the info. (OK, I don't. )

 

[sdstriper]

"Port matching" comes to mind. When I talked to Gillett Diesel he mention the owner supplies the 3" connection. I guess I didn't think too much about it. We need someone with pay Quickserve to browse for non I/C 3" dia. intake horn. Will the I/C horn fit facing the turbo? Long Intake hose or pipe with hose connectors?

 

[pepecat]

Thanks for the info, guys. I see what y'all were saying...

 

[pepecat]

And an update I finally got around to ditching the stock crossover pipe! I ordered a 3" id 90 Silicone hose and a 3"-2. 5" reducing 90 with t bolt clamps from Ebay and used 3" exhaust pipe. The base place is 1/4" steel that I mocked up and templated the holes along with using a 3" holesaw from home depot to get the hole. Then a section of the 3" exhaust pipe was welded into the base plate and then its just bolt and go! Due to the fact that I was dealing with two 90 deg bends I didn't need to mess with angling anything fwd at all. I just rotated the pipe towards the turbo to fit! no bending of metal pipe necessary. right now there's a stock 54 mm h1c inducer on there but I am going to upgrade to the htt stage III for chatter elimination. click the links for pics

Picasa Web Albums - Nicholas - intake

 

[JLEONARD]

Nice job! That will let some air get thru for sure.

 

[Jgolden]

Thats great. I put that on my to do list. Nice and clean.

 

[pepecat]

yeah It seems to breath really nice now, I haven't had a chance to test it out fully, but I'm still waiting on a new turbo. Htt and Gillet diesel are out of compressor upgrades for the h1c! So I just yanked a hx 35 off ebay so at least I have map slots. + I've always wanted a wastegate...