Ideal Stage 3 Hybrid Injectors for Garrett GTP38R?
I know this is a tried & tested upgraded path, so I was wondering which Stage 3 hybrids (i.e. CCs & nozzle size e.g. 238/80, 238/100, 250/100) are best suited to the Garrett GTP38R turbo?
At some point in the future, after I have beefed up my trans, I plan to get the Garrett GTP 38R (probably with 1.0 A/R housing to retain reasonable spool up time while also reducing EGTs some). I am not sure yet whether I want to do a valvetrain upgrade (Comp Cams 910 valve springs & heavy duty pushrods), though I obviously would, if not doing so is inadvisable. I may try & stick with my stock HPOP if it can supply enough pressure, but since my Excursion has ~ 150k on it already, I would consider upgrading to a Stealth SRP 1.1 HPOP. Also, at what boost pressure / power levels are head studs advisable?
Ideally, I'd like to make 500 whp & 1000 wtq, though that is more because those numbers are nice & round rather than a specific need to make those numbers exactly. My main use is as a daily driver, and it would be nice to get somewhere in a hurry when desired (i.e. something akin to a street rod setup), though I would like the ability to bumper pull up to 10k lbs, even though my occasional use load is actually closer to ~ 6k lbs (race car on open trailer). Fuel mpg is a consideration, though not an overriding factor, as the 8" lift, 37" offroad tires, 4.56 gears & roof rack already put a damper on that, and will never yield great mpg.
I obviously understand I would need special tunes to handle the upgraded single shot injectors, and would likely go with either a DP Tuner F6 (I like the ability to be emailed tunes to download & try out, and for tweaks to current tuning) or one of the TS 6-position chips from one of the respected vendors e.g. Tony Wildman, Matt @ Gearhead, Bill @ PHP, Jonathan @ Beans etc. I do have boost, EGT & trans gauges installed & hooked up.
Edit: I forgot to mention that my Excursion is a 2000, so I assume though have not verified for sure that it has forged rods, rather than PMRs (I think pretty much all MY 2000s had forged rods, no?).
Anyway, I am wondering which Stage 3 hybrids (i.e. CCs & nozzle size e.g. 238/80, 238/100, 250/100) are ideally suited to the Garrett GTP38R turbo? I am tempted to just get the 250/100 Stage 3 hybrids, so I have some room to grow in the future if desired, since it seems most tunes can be programed to simply inject less diesel if necessary. However, given that I am probably not going to upgrade the turbo to anything more elaborate than the Garrett GTP38R turbo, there doesn't seem to be a lot of point of upgrading beyond, say, 238/80s if it is the case that the 238/80s are already able to supply more fuel than needed at reasonable injector duty cycles, when maxing out the GTP38R. If it makes any difference, the injectors I would get would probably be reman'd Full Force Diesel / Casserlys.
So, which Stage 3 hybrids do people suggest for my intended setup & use?
P.S. Any feedback on the 1.0 A/R housing vs. the larger 1.15 housing for Garrett GTP38R turbo? I am currently thinking that the 1.0 A/R housing is most likely the right choice for me, as it would retain quicker spool up for driving around town, and it's cheaper. But if e.g. the difference in spool up is marginal, and the 1.15 A/R housing significantly reduces EGTs or surging, I could be convinced to go with the 1.15 A/R housing. Any thoughts or feedback from those who have run either the 1.0 or 1.15 A/R housings or if there is even anyone that has tried both & can provide a comparison?
Last edited by xbox73; 04-25-2012 at 09:02 PM.
Reason: Add Excursion is MY 2000, so most likely forged rods, rather than PMRs