Competition How is the GT42 as a single?

[dzlpwr]

Just curious what you guys think of the GT42 as a single? I tried one with my very tight auto last year and it was a pain to get lit. However, now that I am running a manual this year I thought about giving it another try. Also, what is everyones experience with some of the 3" turbos that Haisleys and Schieds sells? Any other good single turbos that work well with something similar to a super street class?

 

[DPS]

depends on who builds it up from stock, we really don't have enough cubes to run one well right out of the box. Properly modified, the will really surprise you.



Josh

 

[smokinrod]

I run a GT42102R on my puller and love it , 70+ psi I beat it to death and it just keeps wanting more , I would only run the R model ( ball bearing ) but it would never make it as a driver very laggy.

 

[zstroken]

Rod just to clarify I think you have the GT4202, which does have the 102 mm wheel. Why they didn't call it the 42102 I would never know. It seems like it would make much more since. There is another gt42 and it is the gt4294. It is a 71mm inducer with a 94 mm wheel.

I would like to know what a/r they are using on the scheid chargers.

 

[WUnderwood]

I think they make a few different size wheels for the GT 42, so you can always play around with that.



Some of the big 7. 3 Powerstrokes are running them, heavily fueled, and like them. They spool almost like a Garrett GT 38, I have read.



Also, I wasnt aware that Scheid was using Garrett turbos on their pulling trucks

 

[zstroken]

Not the scheid trucks specifically. They sell them though as chargers. The sizes fit right with the garret too. They have a 2. 8 inducer one(gt4294) and then they have a 74mm one I think(gt4202) they also have a BB version. I don't know if they do anything to them to beef them up or not. Never had one that close.

 

[jwilliams3]

You can usually pickup the GT42 with journal bearing and 1. 01 exhaust housing off of the bay for around $1200.



Sounds like a bargain for a performance turbo!!!

 

[dzlpwr]

Do both GT42 models run the same size turbine wheel? The GT4202 that I had at one time used roughly a 3" exducer wheel. Not sure if the GT4294 was the same or not. Is this the same turbo that scheid advertises as the lightening 20001?

 

[jwilliams3]

Taken from Boostpimps.com:

The heart of the Garrett GT42 can be had in two different flavors, those with the standard bushing and those with dual ball bearing center sections. Of course those with the dual ball bearing center sections get the added R designation, yielding the GT42R combination.



Next we'll take a look at the different configurations in wheels and trims available. Here we also have a couple options. There is a small and a large compressor wheel available on the GT42 or GT42R, the actual sizing is as follows:





Turbo Wheel Compressor

Inducer

Diameter

(mm) Compressor

Exducer

Diameter

(mm) Trim

Garrett GT42 GT42 in70 ex94 trim56

Garrett GT42 GT42 in74 ex102 trim53







With the compressor wheel info out of the way, we can move on to focus on the exhaust side of things. The turbine on the Garrett GT42 is an 82mm 84 trim wheel which is paired with either compressor. There is a few options available for turbine housings though. Standard is the large T5 flanged housing with an integrated 5" V-Band discharge with a 1. 15 A/R ratio. Optionally this turbo can be paired with a T04 flanged housing that has an integrated 4" V-Band discharge and 1. 01 or 1. 15 A/R ration housings available. The latter is obviously preferred in small motor applications in search of large horsepower numbers.



The above should cover all of the basics on the Garrett GT42 and Garrett GT42R turbos. If you're looking for spool times and boost thresholds, you won't find any here. Due to the shear size of this turbo, you know it's going to have a lot of lag, however, that's only a tradeoff for that huge top end horsepower it can bring you.