Performance and Accessories 2nd gen only Talk about Dodge/Cummins aftermarket products for second generation trucks here. Can include high-performance mods, or general accessories.

GTA4294 vs GT37 for single ?

Thread Tools
 
Search this Thread
 
Old 07-25-2006 | 10:39 AM
  #31  
Rods's Avatar
Registered User
 
Joined: Feb 2005
Posts: 303
Likes: 0
From: Scottsville Ky
same here , i agree its somewere
Old 07-25-2006 | 01:52 PM
  #32  
joefarmer's Avatar
Registered User
 
Joined: Sep 2003
Posts: 1,300
Likes: 0
From: stupid ohio
Originally Posted by Timmay2
Does anyone run them with wastegates modified though? Either bled, shortened rods, shimmed?

It really does help the spoolup.

Im running my hx35 now w/out the wastegate at all and the trucks smoking quite a bit less.. so i know shes getting air faster. before she would smoke all the way through each gear up till 5th before it cleared up.. now its only the first second or two in gear then its clear until a puff at the next shift..
I've been using a MBC with the stock GT42 wastegate. That's all the wastegate modification at this time.

Originally Posted by Timmay2
The gassers may be turning more rpms, but somehow i doubt the air flow is more.

If i remember right the 2.5 engine modified did about 250cfm on the exhaust side... certianly these trucks do more than that????
If the intake/head can support it, the pumping volume should be the same on a 3.0L @ 8000 rpm as a 6.0L at 4000rpm.

Originally Posted by Timmay2
Does anyone replace the stock intercooler and hump hoses at all? That kills spoolup a bunch too. Huge registrictions to be found from the turbo to the intake valves.

I plan on doing an aftermarket IC and non hump hoses when i do the turbo as well.
Yes. I'm running non-hump 4 ply hoses and custom I/C piping.

Originally Posted by Timmay2
Granted i know theres people that have thrown them on and not had good success, but things have to be done in tandem.. faster spoolup also comes from less intake restriction, less exhaust manifold restriction, and higher exhaust temps...

what all was done on the trucks that ran a gt42 with such slow spoolup?
Cam, DVs, 370s, 4+gsk. If you want to fund me, it will have a ported head too. I will make it work on my truck too. I'm just warning you that it's a battle and practically impossible for the 24v engine's RPM range.

brandon.
Old 07-25-2006 | 01:55 PM
  #33  
signature600's Avatar
Registered User
 
Joined: Aug 2003
Posts: 3,604
Likes: 0
From: Jeffersonville, Ohio
Don't forget Brandon...along with a cam, 4400RPM, and ZERO regard for EGT's Not many 24v's can match that!!

As Josh would say..."You're in the Mayer state of Mind"

Chris
Old 07-25-2006 | 03:26 PM
  #34  
Timmay2's Avatar
Thread Starter
Registered User
 
Joined: Mar 2005
Posts: 652
Likes: 0
From: AZ
Have you tried a performance intercooler?
Old 07-25-2006 | 03:44 PM
  #35  
12vchevydually's Avatar
Registered User
 
Joined: Dec 2004
Posts: 148
Likes: 0
From: Columbus,OH
I see Mr Mayer took my spot on watching EGT's. How Does that work, "Come on Brandon you haven't broke the stop yet,LOL" :MAYER STATE OF MIND:
Old 07-25-2006 | 04:14 PM
  #36  
signature600's Avatar
Registered User
 
Joined: Aug 2003
Posts: 3,604
Likes: 0
From: Jeffersonville, Ohio
Originally Posted by 12vchevydually
I see Mr Mayer took my spot on watching EGT's. How Does that work, "Come on Brandon you haven't broke the stop yet,LOL" :MAYER STATE OF MIND:
Nope, more like..."1200, 1200, 1200, WHOA, 1500. Need more water. Maybe more timing"

We really shouldn't be allowed to hang out together. Something bad's gonna happen one of these days Especially after Brandon rolls the timing forward...to 11mm of plunger lift! Stock is ~5-5.5 tops

Chris
Old 07-25-2006 | 06:09 PM
  #37  
oestreich84's Avatar
Registered User
 
Joined: Jul 2005
Posts: 473
Likes: 0
From: menomonie,wisconsin
I wonder how much it would help to run a blow-off valve instead of a wastegate? Should keep the turbo spooled between shifts right?
Old 07-25-2006 | 08:46 PM
  #38  
ehacker01's Avatar
Registered User
 
Joined: Dec 2005
Posts: 7
Likes: 0
Originally Posted by oestreich84
I wonder how much it would help to run a blow-off valve instead of a wastegate? Should keep the turbo spooled between shifts right?

You don't run either/or. They do different things. a BOV simply releases pressure during shifts and off throttle to reduce compressor surge. A wastegate is on the exhaust side and controls the amount of exhaust the turbo sees
Old 07-26-2006 | 02:25 PM
  #39  
signature600's Avatar
Registered User
 
Joined: Aug 2003
Posts: 3,604
Likes: 0
From: Jeffersonville, Ohio
When you have an Auto, it doesn't need to let off pressure

Chris
Old 07-26-2006 | 05:12 PM
  #40  
smokinrod's Avatar
Registered User
 
Joined: May 2006
Posts: 116
Likes: 0
From: MI
I am not saying it is good to run 70+ but it spools very fast for a turbo of this size, say what you all want but I ran one all last year on my ford without any problems and all this year on my dodge. at the track i have yet to peek 1200* and that is hitting 120mph ( with NOS). at the pulls I haven't been over 1400* and an average of 65psi on my external waste gate allthow this is not a 500.00 dallor turbo like some said. here is what I am running whitch is a 3.0" turbo with a 1.01 AR and I run an auto
Ball Bearing
Water cooled bearing system
BALL BEARING CHRA OPTIONS

GT4202R COMPRESSOR TURBINE
CHRA
451888-11


compressor Wh Dia Trim
74.3mm 102.3mm 53

turbine Wh Dia Trim
82mm 84
Old 07-26-2006 | 08:30 PM
  #41  
oestreich84's Avatar
Registered User
 
Joined: Jul 2005
Posts: 473
Likes: 0
From: menomonie,wisconsin
Originally Posted by ehacker01
You don't run either/or. They do different things. a BOV simply releases pressure during shifts and off throttle to reduce compressor surge. A wastegate is on the exhaust side and controls the amount of exhaust the turbo sees
I realize that they do different things. A blow-off valve will release the pressure in the intake system. A wastegate relieves it from the exhaust. With a wastegate, you are reducing exhaust flow to the turbo, which is why it will take more time to re-spool. A blow-off valve will keep the exhaust flow going to the turbo, and keep it spooled, but will release the pressure going to the engine. So, with the exhaust flow still going through the turbo with a blow-off valve in the intake, you should have quicker spoolup after shifts. Makes sense in my mind.
Old 07-27-2006 | 01:54 AM
  #42  
joefarmer's Avatar
Registered User
 
Joined: Sep 2003
Posts: 1,300
Likes: 0
From: stupid ohio
Originally Posted by smokinrod
I am not saying it is good to run 70+ but it spools very fast for a turbo of this size, say what you all want but I ran one all last year on my ford without any problems and all this year on my dodge. at the track i have yet to peek 1200* and that is hitting 120mph ( with NOS). at the pulls I haven't been over 1400* and an average of 65psi on my external waste gate allthow this is not a 500.00 dallor turbo like some said. here is what I am running whitch is a 3.0" turbo with a 1.01 AR and I run an auto
Ball Bearing
Water cooled bearing system
BALL BEARING CHRA OPTIONS

GT4202R COMPRESSOR TURBINE
CHRA
451888-11


compressor Wh Dia Trim
74.3mm 102.3mm 53

turbine Wh Dia Trim
82mm 84
That's impressive! I didn't realize yours was watercooled and ball bearing. I'm still a little gun-shy about running that much boost through a single, but if it works... SWEET!!!

brandon.
Old 07-27-2006 | 08:45 AM
  #43  
smokinrod's Avatar
Registered User
 
Joined: May 2006
Posts: 116
Likes: 0
From: MI
As much as you hate to admitt to it they really are impressive when you think of the shear size compared to how they spool up, as a mtter of fact that is the same thing Scott Amos took 2 place at IRP with (I was told by a certain machine shop.)
Old 07-27-2006 | 09:01 AM
  #44  
signature600's Avatar
Registered User
 
Joined: Aug 2003
Posts: 3,604
Likes: 0
From: Jeffersonville, Ohio
So the GT45R I have should spool really well in a twinset, huh??

I'm actually impressed with how the GT42 spools on Brandon's truck...especially how big it is, and how much air it moves...eventually And, it was about a third of the price of "comparable" turbo's normally on the diesel market

Chris
Old 07-27-2006 | 06:58 PM
  #45  
Timmay2's Avatar
Thread Starter
Registered User
 
Joined: Mar 2005
Posts: 652
Likes: 0
From: AZ
Originally Posted by oestreich84
I realize that they do different things. A blow-off valve will release the pressure in the intake system. A wastegate relieves it from the exhaust. With a wastegate, you are reducing exhaust flow to the turbo, which is why it will take more time to re-spool. A blow-off valve will keep the exhaust flow going to the turbo, and keep it spooled, but will release the pressure going to the engine. So, with the exhaust flow still going through the turbo with a blow-off valve in the intake, you should have quicker spoolup after shifts. Makes sense in my mind.
In a sense youre right.. the bov's main purpose though is to keep the air in the charge tubes from slowing down the compressor when it has no where to go. Because these diesels dont have throttle plates that close like a gas engine, the blow off valve doesnt help a diesel nearly as much as a gas engine.. between shifts the wastegate will never open. if anything, at WOT the wastegate may be open to not let the turbo go beyond 36 psi or whatever you have it set at... once you lift the throttle, the psi drops, the wastegate will close because the turbo isnt spooled enough.

Not a huge issue to worry bout on diesels, especially with a turbo this size, thats ALOT of rotating mass to slow down on its own without a throttle plate to slam closed and stack air up.

Ever listen to a turbo spooling down through straight exhaust pipe? Could take over 5 seconds at idle speed to slow down to the point you dont hear it.

Not letting off the gas between shifts will help with keeping it up to speed.. let up a little so you dont redline but dont let it drop down below 2k.

But one good thing about turbos this big is they are very effecient and make more HP per PSI.. so once it starts making boost, the rest of the boost comes quicker per say..

Id venture to say 20psi on a larger turbo is worth about as much as 25-30 psi on a smaller turbo.. just because the oxygen in the air is going to be denser and cooler.

but i just pulled those figures out of a dark cavity on my body, so they are just a guess.


Quick Reply: GTA4294 vs GT37 for single ?



All times are GMT -5. The time now is 11:45 PM.