GLHS

Who's running one?
What mods need to be made to the oil feed line, if any?
Looking for a little extra oomph.
Kurt

Tate

That turbo should be a bolt in affair for you. Tom does the HX40 outlet on his Garretts, so it should fall right in where that SPS was. Not sure how it runs yet, still in the mock up stages with mine.

EBunger

What does one of them cost? I'm lookin for cleaner soot output

Mike Holmen

I run a stage 2, and works well. Its survived my heavy right foot abuse so far. You might want to put on a larger turbine exhaust flange like Tate said. They spool fast and flow tons of air. I just had a machine shop build me a exhaust flange and I welded up my own pipe. I use a 3in downpipe for my twins but I'm sure that you could put on any size you want. On a single I would weld on a 3in to 4in exhaust increaser. Garrett kits is pretty complete.
It makes for one sweet secondary twin turbo. The garrett down pipe is 2 1/2in into 3in. So toss it. Go big or go home.

98.5Hotrod

From Turbo Re-Source I paid $1900 for a stage 3 Gt3788r specs are comp inducer 64.7, exducer 88mm, 72.6 exhaust wheel and .89ar(15cm) exhaust housing. Runs a HX40 downpipe pipe. Price was with Hx40 exhaust downpipe. Also bolts right in, no mods needed.

EBunger

I talked to Tom and got quoted and his do take HX40 dp's so sweeeet.

GLHS

Hotrod; What were you running before and how does it compare to the Garrett?

98.5Hotrod

Stock charger before, so I don't know how to compare it. Other than truck pulls alot harder, spools quick for the size of it. To be honest I don't think you'll gain alot over SPS62/71/14. I think I would go bigger if your going to change turbos. I'm really don't know alot about turbos, I would talk to some one like Mike Holman,Tate or Hohn.

Tate

You might not even gain anything over the SPS on the top end. I know Andy (Hammer) is running a 3788 on his 12v, and he can't break 500 with it. Not sure how much would be gained with the 24v head.

98.5hotrod, don't the 3788's come with the .99 exhausthousing?

98.5Hotrod

Tom told me it came with a .89. There are no markings on it to tell what it is. Also if you buy the Powermax gt3788r from Garrett or a distributor they come with that real restrictive exhaust elbow. With that elbow you'll never get to 500 I'm told.

Mike Holmen

Didn't a diesel mag post a 530 rwhp run on a garrett GT4788R turbo on a 3rd gen truck? Of course they could be off abit.
98.5 what kinda of egt's you pull? How fast can you get the boost up to 40psi? I heard a few guys hearing a stall during wot shifts on a stick. I've only stalled mine once or twice. It only occurs during a WOT hard pull then on the hard hard onto the brakes, a.k.a. bad ricer drivers.
I would to like to run one a single to see the differences of just running a single.

98.5Hotrod

TDR tested a 3rd gen with the gt3788r and it did 530hp and 1100 fttq on the dyno. Max egt just over 1000. My truck running 70mph runs about 525-625 depending on conditions. My max egts I havent checked since cam install. Don't no how long to 40psi, I'm just running my Smarty right now, TST is in being upgraded to PMCE. Once spooled it seems like only a few seconds and its at 40psi. If turbo stall and bark are the same thing at wot it does it between each shift.

HOHN

The EGTs mentioned in TDR might not be that useful if noted on a Dynojet run. Dynojets tend to have low EGTs for quick-spooling turbos and higher than normal EGTs for laggy turbos-- depending on how the DJ load dictates the operating range relative to the turbine map.

Spoolup is partially a function of load, and since a DJ has a fixed load, it will give different EGT indications for different chargers that do NOT reflect what a person might see on the street.

The Stg 3 Garrett should have a .99AR housing and a 63.5mm inducer unless Tom is modding the Garrett config. The .99AR is needed with the bigger 63.5mm inducer in part because surging will be a major issue with the fast-spool qualities of a BB Garrett.

Andy (Hammer) hit a brick wall with his Stg3 on the 12V just under 500hp (BB syndrome strikes again!). But on later trucks with better headflow, the turbo seems able to crack 500. I can see the airflow of a 3rd gen head easily accounting for 20-30hp difference between Andy's 12V and later HPCR test results.

JH

98.5Hotrod

Hohn those are the specs Tom gave me, may be that why he calls it a custom stage 3.

GLHS

I think in TDR issue 58 is when Scott swapped the SPS for the Garrett and picked up about 22 hp and 80 ft lbs.
In the latest issue he is now running the Garrett twins and picked up 60 more hp.