GTA4294 vs GT37 for single ?
#32
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..
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..
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 i remember right the 2.5 engine modified did about 250cfm on the exhaust side... certianly these trucks do more than that????
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.
I plan on doing an aftermarket IC and non hump hoses when i do the turbo as well.
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?
what all was done on the trucks that ran a gt42 with such slow spoolup?
brandon.
#36
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:
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
#38
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
#40
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
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
#41
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
#42
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
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
brandon.
#43
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.)
#44
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
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
#45
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.
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.