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Anyone Have Any Experience with a GT4202?

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Old Aug 25, 2007 | 09:01 PM
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Default Anyone Have Any Experience with a GT4202?

Just like the title says... Looking for good and bad experiences with this turbo. I have a stock cube ls1 and I and considering going turbo (rear mount). My friend has one of these for sale and I wanted to get some opinions on it. I'm shooting for 550 rwhp now, with the option to turn up the boost after I build up the bottom end.

Thanks for looking...
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Old Aug 26, 2007 | 12:16 AM
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My opinion is if its a T6 flanged unit dont go rear mount....
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Old Aug 26, 2007 | 08:41 AM
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Is that because of the size? It's a T4...

Is this turbo overkill for what I am looking to do?
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Old Aug 26, 2007 | 11:19 AM
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Do you already have a rear mount turbo set-up???

If not id put it up front....... there is room.
That turbo will do 550rwhp on a 346 no problem... now down th eroad it depends on if ya stay with stock cubes and how hard you really push it...
Is it the 70 or 74mm compressor wheel??
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Old Aug 26, 2007 | 02:24 PM
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GT4202 should be either the 74 or 76mm version. Like kyle said, thats a big *** turbo, and there are faster spooling turbos with a 74 or 76mm wheel that will perform better.
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Old Aug 26, 2007 | 02:33 PM
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like the good old TC76
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Old Aug 26, 2007 | 04:20 PM
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i do not have a rear mount setup yet, but this is not in an f-body and there is little to no room up front because I want to keep A/C.

Here's a link to the turbo: http://www.turbobygarrett.com/turbob...2_731376_2.htm

I believe the 02 designation makes it a 102 mm... I think that's what it says for the compresor wheel diameter. Anyone think any different?
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Old Aug 26, 2007 | 04:21 PM
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Originally Posted by RealQuick
GT4202 should be either the 74 or 76mm version. Like kyle said, thats a big *** turbo, and there are faster spooling turbos with a 74 or 76mm wheel that will perform better.
What kind of spool are we talking about? What rpms would I see 10 psi at with stock cube engine?
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Old Aug 26, 2007 | 06:51 PM
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I originally considered a GT4202 for my rear mount and had a great deal on one. But after asking around most suggested against it. Are you staying with the 346?

What kind of spool are we talking about? What rpms would I see 10 psi at with stock cube engine?
Difficult to say with a rear mount. Possibly 3k but could be 3500 depending on how the car is setup, maybe more. TC72 or 76 are good choices for under $1k
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Old Aug 26, 2007 | 09:08 PM
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The TC 76 will way outspool a GT42 unit. Also the GT4202 is a 74mm unit.
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Old Aug 26, 2007 | 09:59 PM
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Originally Posted by DrTurbo
Also the GT4202 is a 74mm unit.
Are you saying the thread starter's turbo is 74mm or are you saying that a GT4202 is only a 74mm? I know for a fact that GT4202 can also be a 76mm.
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Old Aug 26, 2007 | 10:00 PM
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Originally Posted by JAvenger007
Difficult to say with a rear mount. Possibly 3k but could be 3500 depending on how the car is setup, maybe more. TC72 or 76 are good choices for under $1k
Realistically, I bet full boost wouldnt come on until 4500rpm or so.
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Old Aug 26, 2007 | 11:11 PM
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Thanks guys... I will have to look into the TC turbos... I haven't heard of those. Who makes them?

BTW, I am staying stock cubes for now.

Speaking of turbos <$1000, what have you heard about Master Power?
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Old Aug 27, 2007 | 12:36 AM
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Turbonetics makes the TC units.

I had a master power temporarily before getting a few garret units. They seem to be a hit or miss. Some have great success and others dont get much out of them. I think a lot of shops will recommend something else. I have a .96 MP exhaust housing and thats it, so I can't comment on their performance. It worked fine on my 60-1 turbo but thats all the data I can give. Their construction is relatively solid but not to the specs of a garrett, turbonetics, ect. I ended up selling mine in favor of a garrett 67
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Old Aug 27, 2007 | 07:56 AM
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Originally Posted by RealQuick
Are you saying the thread starter's turbo is 74mm or are you saying that a GT4202 is only a 74mm? I know for a fact that GT4202 can also be a 76mm.
Precision makes a 76mm unit. If it's an actual Garrett GT4202 then it's 74mm, otherwise it's not a garrett part. I know, I had 2 of them

I personally don't think you'll get the power you want out of it once you push it past 8 or 9 psi.

And FWIW, the 102mm designation is the exducer diameter of the compressor wheel. Similar for the 94mm of the GT4294. Based on the wheel trim for each that's 74mm and 70mm inlet diameter respectively.
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Old Aug 27, 2007 | 08:20 AM
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Originally Posted by y2khawk
Precision makes a 76mm unit. If it's an actual Garrett GT4202 then it's 74mm, otherwise it's not a garrett part. I know, I had 2 of them

I personally don't think you'll get the power you want out of it once you push it past 8 or 9 psi.

And FWIW, the 102mm designation is the exducer diameter of the compressor wheel. Similar for the 94mm of the GT4294. Based on the wheel trim for each that's 74mm and 70mm inlet diameter respectively.
Previously on Garrett's website they had 74mm and 76mm listed, but now they only list the 74.7mm one. I stand corrected.
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Old Aug 27, 2007 | 10:36 AM
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Originally Posted by Rhythm
Thanks guys... I will have to look into the TC turbos... I haven't heard of those. Who makes them?

BTW, I am staying stock cubes for now.

Speaking of turbos <$1000, what have you heard about Master Power?
The TC units are here....

http://www.forcedinductions.com/productturbonetics.htm
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Old Aug 27, 2007 | 01:52 PM
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Originally Posted by DrTurbo
Thanks!

What's the difference between the TC and T series turbos?
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Old Aug 27, 2007 | 02:49 PM
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We use a different comp cover and backing plate for the units.
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Old Feb 5, 2008 | 11:13 PM
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Back from the dead....

Update: I have a 403 ls2 short block for the car now and the gt4202 is still for sale. Any new thoughts?
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