Garret GT28 RS

[SmoknHondaOwnrs]

My buddy just informed me that he was selling his BRAND NEW Garret GT28 RS turbo. He bought it new for his civic a while ago and just never used it. I have 2 questions..He said it might be too small for a v6. Is it too small? And is $900 a good price? It is 100% brand new.

 

[SASHO91]

too small.

 

[SmoknHondaOwnrs]

What is a good size?

 

[SASHO91]

How much Hp are you looking at?

 

[SmoknHondaOwnrs]

Not really sure. I dont know much about turbos and what kind of HP i could be putting out, but id just like to have a nice effecient setup that would be worth the cost of putting together. I have capabilities and the resources to do it myself. I just need to gather some info first.

 

[SASHO91]

have you tried a search yet? not trying to sound like that.... its just that, alot of this has been covered alot of times.

 

[SmoknHondaOwnrs]

yea i kinda figured. I just wanted to know about that particular turbo at first though. Ill start searchin it up i guess...

 

[gmorrell]

The GT28 RS has 2 compressor trims, 60 and 62 trim. The 62 trim unit will support higher pressure ratios, but the choke line is messier than the 60 trim.

Assume for a moment 3.0L, 10 psi of boost, VE of 85%, and a very good intercooler with 130F discharge temperature. The pressure ratio is 1.8, and you're going to hit 30 pounds/minute just short of 6000 RPM. This is already way on the right side of the compressor map, almost in the choke line, and well into the 60% efficiency island - bad place to be, turbo too small. Even the larger A/R GT28RS turbine is going to get pretty restrictive above 20 pounds/minute exhaust flow.

Not a good choice, this is a nice little unit, but you should pass on it.

****, I've got a GT30R on my 2.3L four cylinder engine! But then, I'm running 25 pounds of boost at 45 pounds/minute and a pressure ratio of near 3, which BTW, works out to about 400 horsepower from 138 cubic inches.

 

[Off Road SHO]

I was just quoted 1,360.00 for the GT35 from a Garrett Performance dealer; a unit that he determined to be sufficient for the Yamaha. Please, don't spend money on a fancy ball bearing turbo and put it in a car with a stock tranny and brakes. It's like buying a Benz when you don't have a garage. That is a good price for that little turbo though.

There are plenty of turbos out there for cheap off of other vehicles that will work just fine for experimenting, the Holset HX-35 and HX-40 from Dodge Cummings pickups come to mind. Are they the absolute most perfect match for the SHO? Without a doubt, no. Are they better than no turbo? A resounding He!! Yeah!!

Buford, we need to slow this car down now...Buford?....Buford?

I am in the process of re-fitting The Other Woman (actually, I'm paying a fabrication shop to do most of the work) with a T3/T4 hybrid turbo. I will take pics of how we do it and post them. I want to SHOw everybody on this Forum how several other SHO powered buggy guys have done it, and how I will be copying their style. Quite simple.

Tom

 

[SmoknHondaOwnrs]

Well, i have a rebuilt turbo off of a Mistu Conquest that was givin to me. I was gonna sell it to a ricer. I dont know the specs on it but i would never think it would be big enough, so was just gonna get rid of it. Anyone know about those?

 

[93silverbulletSH0]

I can't wait to see the Other Woman with a turbo... are you going to try for the 500+hp that Extreme Performance SHO powered sandcars put down?

 

[Off Road SHO]

I can't wait to see the Other Woman with a turbo... are you going to try for the 500+hp that Extreme Performance SHO powered sandcars put down?

I hope to get 436 hp and 417 torque at the ground.

That mitsubishi turbo will be too small also. It will spool quickly but become a blockage in the intake after about 3k rpms.

Tom

 

[munkee]

Here ya go Smokn, http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=tp&Category_Code=TBOThis should be a good read also,http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech101.html

 

[SHO Dude]

There are plenty of turbos out there for cheap off of other vehicles that will work just fine for experimenting, the Holset HX-35 and HX-40 from Dodge Cummings pickups come to mind. Are they the absolute most perfect match for the SHO? Without a doubt, no. Are they better than no turbo? A resounding He!! Yeah!!

Buford, we need to slow this car down now...Buford?....Buford?

I am in the process of re-fitting The Other Woman (actually, I'm paying a fabrication shop to do most of the work) with a T3/T4 hybrid turbo. I will take pics of how we do it and post them. I want to SHOw everybody on this Forum how several other SHO powered buggy guys have done it, and how I will be copying their style. Quite simple.

Tom

Interesting idea. You've got the room and the skills to fit just about anything in there.

What about compounding the compressors. Let the turbo feed the supercharger. The bottom end grunt of the supercharger will kick start the turbo. The supercharger usu sally runs out of breath at high rpm, but when it's being force fed by the turbo, it should do quite nicely.

That Holset you were talking about will proll'y have enough AR in the turbine housing to not be a restriction to the exhaust and should turn up very nicely when it comes time to make THE noise.

That M90 supercharger won't care if you're force feeding it because it's not stripped. The tridecacoidal design of that blower is still efficient enough to take a pressurized inlet charge and compound it into the engine without adding that much more heat.

What do you think?

 

[TT SHO PROJECT]

so a gt28 is smaller than my 16g? i doubt that... my 16g flows 38 pounds/min at 550cfm... and its a dinky lil turbo and feeds the 3.0 upto 8 grand... and for who asked about a conquest turbo... now thats a small turbo thats like a 12b or 13b if i recall... youd probably only gain like 20-30 hp not worth it in my book..

just my 2 cents.

-Turbo Bob.
wow ok i just looked the garrett gt28 up... yeah way to small my bad... only is good for 250whp... wouldnt do much but give you hella low end.

 

[Off Road SHO]

QUOTE=SHO Dude]Interesting idea. You've got the room and the skills to fit just about anything in there.

What about compounding the compressors. Let the turbo feed the supercharger. The bottom end grunt of the supercharger will kick start the turbo. The supercharger usu sally runs out of breath at high rpm, but when it's being force fed by the turbo, it should do quite nicely.

That Holset you were talking about will proll'y have enough AR in the turbine housing to not be a restriction to the exhaust and should turn up very nicely when it comes time to make THE noise.

That M90 supercharger won't care if you're force feeding it because it's not stripped. The tridecacoidal design of that blower is still efficient enough to take a pressurized inlet charge and compound it into the engine without adding that much more heat.

What do you think?[/QUOTE]


Already thought about that idea. The problem I keep running into is volume of intake tract to fill AND finding a tranny to hold the power. If I was to compound feed, I would use a BIG blower like the M112 or 122 running Gilmer belt drive. I would ditch the snakes and bolt the blower to a custom intake that housed an air/water intercooler. I'd run two injectors per cylinder, 24 pounders for up to 4000 rpm's and 48 pounders for the happy rpm's.

There is a buggy here in town that used twin turbos to feed twin centrifugal blowers on as LS-7. Strictly for one-up-manship mind you, but cool none the less. The shop fabbed it up and THEN they called in a flow man and they had to re-do most of the plumbing. They were asking 150,000.00 for it.


Or...I would just do this and be done with it.


Tom

 

[SHO Dude]

Already thought about that idea. The problem I keep running into is volume of intake tract to fill AND finding a tranny to hold the power. If I was to compound feed, I would use a BIG blower like the M112 or 122 running Gilmer belt drive. I would ditch the snakes and bolt the blower to a custom intake that housed an air/water intercooler. I'd run two injectors per cylinder, 24 pounders for up to 4000 rpm's and 48 pounders for the happy rpm's.

There is a buggy here in town that used twin turbos to feed twin centrifugal blowers on as LS-7. Strictly for one-up-manship mind you, but cool none the less. The shop fabbed it up and THEN they called in a flow man and they had to re-do most of the plumbing. They were asking 150,000.00 for it.

Tom

I wouldn't worry about flow thru the smaller blower. Compressed air is compressed air. The M-90 will kick tart the turbo. Once the turbo is spooled up, you can run as much boost thru the supercharger as you want. It proll'y won't compress it much more, but it will be able to take a gulp of compressed air and help push it into the engine. The issue with big turbos is that they take so long to spool up and work in such are efficient in such a small power band. The supercharger would solve the problem of getting that big hair dryer to get spooled up.

A pair of injectors is also a good idea. I don't think the drivers in the PCM are strong enough to drive 2 injectors, but I don't know. Using 2 high impedance injectors might not put too much load on the driver, but we'll have to find out. If they aren't, you could run an SID arrangement and adjust the tuning to accommodate the additional fuel. With a PD blower for bottom end torque, you don't need a complex intake manifold like the SHO motor has. Build a box and mount both sets of injectors upstream of the current injector location and rock on.

The advantage you have with The Other Woman is space and packaging. Who gives a crap if it looks like Frankenstein with stuff hanging out all over the place, it's a buggy, for God's sake.

Just a very interesting idea. BTW, I've got a couple of M-122's lyin' around.

 

[Off Road SHO]

.

A pair of injectors is also a good idea. I don't think the drivers in the PCM are strong enough to drive 2 injectors, but I don't know. Using 2 high impedance injectors might not put too much load on the driver, but we'll have to find out. If they aren't, you could run an SID arrangement and adjust the tuning to accommodate the additional fuel. With a PD blower for bottom end torque, you don't need a complex intake manifold like the SHO motor has. Build a box and mount both sets of injectors upstream of the current injector location and rock on.

The advantage you have with The Other Woman is space and packaging. Who gives a crap if it looks like Frankenstein with stuff hanging out all over the place, it's a buggy, for God's sake.

Just a very interesting idea. BTW, I've got a couple of M-122's lyin' around.

At the point where I'd be using two injectors, I'd be running a Motec or Megasquirt system.

Hold onto at least one of those blowers. Can you trace out the output side of that blower for me or send me a gasket? My Son-in-Law is a whiz with Solidworks and could draw me up something to play with.


Tom

 

[SHO Dude]

I can do that. The outlet is a rectangular ****** similar to a Lightning, but the inlet is on the side.

If you're gonna use something big like that, who needs a turbo. It can make 10psi of boost right now and not even break a sweat.

As for SID, there's even Big Stuff 3. It's a learing system that uses commanded AFR and a WBO2 as a monitor. Command 12:1 at WFO and you'll get it.

 

[Off Road SHO]

I can do that. The outlet is a rectangular ****** similar to a Lightning, but the inlet is on the side.

.

Is that the intercooler or the blower? I guess it's time for me to mosey on over to SVC MotorSports and see if I can scrounge up some parts. Nice thing about the Eatons is that they already have the bypass valves built in and an intercooler allready designed.

Tom