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Hopefully this doesn't double post.. I posted an hour ago but it never showed up?
I'm building a turbocharged ls T Bucket.
I have an 02 LM7 I rebuilt. New main bearings, rod bearings, cam bearings, piston rings (gapped for boost). I installed a 98-00 factory take out LS1 cam.
I picked up a turbo. The turbo I have is a Garrett GT4288N. Compressor is a 64.7mm inducer with a 88mm exducer. The turbine is a 82mm inducer with a 75mm exducer. T6 twin scroll. Hotside has 1.32 AR.
I have a set of cast hooker manifolds. I plan to flip those manifolds and build a cross over. The turbo will mount right in front of the water pump. Non intercooler.
The rest of my drivetrain is a 4L80E I built myself. An 8 inch ford rear end with a 2.79 gear set (will most likely change that later but for now it'll turn the wheels)
I know this is a generic question but what does everyone guess that turbo will have for spool characteristics?
My last question is, will this turbo handle the added displacement of a lq4? I acquired an LQ4 from my last u pull and pay run but thats a save for later type of deal.
Any other input?
I'm no stranger to horsepower. Been a mechanic for 10 years now on paper but I've been doing it since I was a kid. But this is my first forced induction build.
That is a werid turbo. It appears to be off a diesel truck. That is a big exhaust housing but the actual turbine wheel is small. What are you overall goals for power/ET, etc? It will spool well IMO and would be fun on the 5.3 in a street car. Probably make 700 rwhp but I think you will run into back pressure issue due to small turbine. The compressor wheel isn't anyhting special at all either. If you're looking for a fast spooling 700-750 max RWHP turbo I think it could get you there on 325". I wouldn't even attempt to put it on a 365" 6.0 personally.
If you're wanting a turbo to run on both a 5.3 and 6.0 that would not be my choice. I would get a VS or Borg S475 or S480 for that.
Sounds cool! That car probably will weigh 1500lbs or so and i'm guessing is a very short wheelbase. Smaller turbo is probably all that is needed with that thing, I myself would probably be too afraid to push it at very high speeds anyway lol. Post pics!!
That is a werid turbo. It appears to be off a diesel truck. That is a big exhaust housing but the actual turbine wheel is small. What are you overall goals for power/ET, etc? It will spool well IMO and would be fun on the 5.3 in a street car. Probably make 700 rwhp but I think you will run into back pressure issue due to small turbine. The compressor wheel isn't anyhting special at all either. If you're looking for a fast spooling 700-750 max RWHP turbo I think it could get you there on 325". I wouldn't even attempt to put it on a 365" 6.0 personally.
If you're wanting a turbo to run on both a 5.3 and 6.0 that would not be my choice. I would get a VS or Borg S475 or S480 for that.
Thats what I figured but wanted to ask. Since my homemade hotside will have a t6 flange I can upgrade to a bigger turbo when the 6.0 gets built and goes in.
The turbo is for a 12 liter diesel Volvo. Its brand new though. Picked it up cheap.
I'm thinking 600hp to the wheels is going to be pushing traction issues with the t bucket. We'll find out. I've got 15x10" wheels for the rear, just need some good tires. The completed car will be between 1500-1800lbs.
Sounds cool! That car probably will weigh 1500lbs or so and i'm guessing is a very short wheelbase. Smaller turbo is probably all that is needed with that thing, I myself would probably be too afraid to push it at very high speeds anyway lol. Post pics!!
Standard wheel base on these is 108". I stretched the body on mine cause I'm 6' 8" tall. So my frame rails are going to become longer. Longer wheel base handles better too.
I'll post some pics. It's all just scattered components right now lol.
I think you'll be fine. The later spool will give you a chance for traction. but if you do want faster spool you could look for a smaller 1.10 AR turbine housing off of a Detroit 60 11 liter engine or a t4 housing off of a Detroit 50 4 cylinder, they usually came in city busses. It was basically a 60 series with 2 cylinders cut off. They both ran gt4294 turbos in those so the turbine will fit easy. Gt42 turbine housings new are cost prohibitive. You could be a whole turbo for the price.
'd bet its around a 600hp turbo 5.3 or 6.0 doesn't matter. 75mm turbine is decent IMO. It will run out of compressor first.
Should spool fine IMO. Its like the small S475 with an a 65mm compressor. I'd use 2" piping from each manifold to a divided T6 flange. 38mm gate on each bank. Should be good to go!
1800lbs is light! My 27 T with a 200lb driver and ALUM 5.3 full of fluids oil etc will be about 2300lbs. That's with a uncut cab, 9" and glide.
Was 1360lbs as a roller!
Last edited by Forcefed86; Feb 8, 2021 at 02:28 PM.
I'd bet its around a 600hp turbo 5.3 or 6.0 doesn't matter. 75mm turbine is decent IMO. It will run out of compressor first.
Should spool fine IMO. Its like the small S475 with an a 65mm compressor. I'd use 2" piping from each manifold to a divided T6 flange. 38mm gate on each bank. Should be good to go!
1800lbs is light! My 27 T with a 200lb driver and ALUM 5.3 full of fluids oil etc will be about 2300lbs. That's with a uncut cab, 9" and glide.
Was 1360lbs as a roller!
If mine goes closer to 2000lbs it's no big deal. I'll have the power to make it move.
Just curious why you say 2" rather than 2.25"? Is it a velocity thing?
I guess I cant post pictures yet and can't quote posts with pictures cause I'm new? Just keeps telling me a moderator has to review my posts. That's kinda silly. Every other forum I've been on doesn't even give you the picture option when that's the case...
Anyways...
Since I can't quote your post forcefed,
If my build goes closer to 2000lbs it's no big deal, I'll have the power to move it around.
Why 2" rather than 2.25"? Is it a velocity thing? That won't cause a choke point from the neck down of the collector into the pipe? Just curious.
I agree 2000-24000 is still featherweight territory! Was just surprised by the sub 2000lb numbers...and jealous!
The choke point is almost always the turbo exit volute in the housing, not the piping. Should size the piping according to your power goals. 900ish crank and below 2" performs better in my experience. Basically no reason not to run it. You can drop the pipe diameter and up the turbo housing size and basically get less back pressure overall and better spool characteristics. It's also cheaper and easier to package. Basically a "win" all around. My mild 4.8 spooled the big s480 more quickly than most 6.0's. (at out track anyway) I attribute this to the divided 2" hot-side.
You already have a fairly large housing turbo, might as well get it spun up as quickly as possible. Your turbo will not be limited by 2" piping in anyway. I do feel I was around the limit of the 2" piping but I was around 930 at the wheels and had never planned on making that much power with the little 4.8. FWIW I also ran the same 2" hotside on my 370" motor and trapped 159.8 at less boost. Almost like I hit a ceiling right around 160 w the 2" hot-side. More boost actually went slower... If you have plans on making over 900 crank go with 2.25".
Last edited by Forcefed86; Feb 4, 2021 at 08:00 AM.
I guess I cant post pictures yet and can't quote posts with pictures cause I'm new? Just keeps telling me a moderator has to review my posts. That's kinda silly. Every other forum I've been on doesn't even give you the picture option when that's the case...
Anyways...
Since I can't quote your post forcefed,
If my build goes closer to 2000lbs it's no big deal, I'll have the power to move it around.
Why 2" rather than 2.25"? Is it a velocity thing? That won't cause a choke point from the neck down of the collector into the pipe? Just curious.
Yeah you have to get a min number of posts, it was an old rule we had to screen out scammers.
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Turbo T Bucket 
