Comparing gtx4294r to gtx4202r

[Hot COCOAL]

So, what would be the better charger to use as a single in a street driven application? For appx. 850whp...

The 94 says its capable of up to 1000 horse
And the 02 says its capable of more than 1000 horse

Can you(the forum) give me the run down between the two....:hello:

Thanks

 

[cafryer]

4202 would be my choice

 

[Hot COCOAL]

http://www.turbobygarrett.com/turbobygarrett/turbochargers

Here's a link to the compare page. Then you have to go to page three, and select the gtx4294r and the gtx4202r and it will show side by side maps of each turbo. The weird thing to me is, both are being compared at a .60 A/R in the compressor chart, then on the turbine chart it compares 4 housings starting at an A/R of 1.01...and in this chart it shows both turbos doing the exact same thing in each A/R? On another page it shows both turbos use an 82mm turbine diameter, is that why they are showing both turbos doing the same #'s in the turbine chart?

So for the gtx4294r Garrett says this
Compressor inducer diameter- 70.30
Compressor exducer diameter- 94.0
Turbine diameter - 82.0

The gtx4202r
Compressor inducer diameter- 75.80
Compressor exducer diameter- 102.30
Turbine diameter - 82.0

What does this stuff mean? When and where does the A/R come into play
Does the housing determine the A/R?

I think I am looking to use the A/R of 1.01 for a street driven truck, right?

 

[Hot COCOAL]

4202 would be my choice

Why, just because it moves more exhaust gasses? Won't it have a slightly slower spool rate because of this? And if I am only looking to make 850whp won't the gtx4294 be more suited for that power level? I'm just asking, I have no idea what better for what reasons, thanks for the help

 

[Hot COCOAL]

The gtx4294r is rated for 475-950whp

The gtx4202r is rated for 525-1125whp

 

[Hot COCOAL]

Both would make similar power. The gtx obviously has a smaller compressor wheel and will be more responsive and have less lag while making similar power as the 02. Gtx probably will be more expensive.

I am asking to compare two gtx turbos, wondering which of the two would be best suited for street driving the gtx4294r or the gtx4202r, trying to get insight as to which would light faster run the most efficient and run the coolest egt at a given power level between a daily driven 650whp to a occasional 850whp. I will have 100% exergy injectors and a single 10mm exergy pump

the standard gt4202r is actually the smaller of the two with a 74.70 compressor inducer diameter v.s the gtx4202r 75.80 inducer diameter

The gtx turbos are considerably more expensive, probably because of the newly designed forged billet wheel and dual ball bearing cartridge...

 

[cafryer]

4202 gives you room to grow and the spool fast enough you wont have a prob

 

[PACougar]

^^^I agree, the 94 is too small and won't do want you want. The 4202 gives you the space to grow plus with good tuning it'll spool fine.

 

[Hot COCOAL]

Alright, so you guys like gtx4202r :Charger:
Because you can get more hp out of it, and don't think it will spool any slower?

I think the guys at duramaxtuner had a goal at one time to create a tune to have the quickest spooling and cleanest gt4202 on the planet, saw a vid about it, it looked and sounded pretty quick on spool, and lit the tires at will, at what looked like any speed I imagine the gtx would be that much better:thumb:

:hi5:

Thanks for your input

 

[zebiraross]

My bad, I thought you were asking between gtx4294 vs standard gt4202. I retract my previous post.

 

[Hot COCOAL]

:hug:
:roflmao:
No worries:thumb:

What's your opinion between the two though?

 

[Hot COCOAL]

Didn't you post a vid about how long your ball bearing turbo kept spinning after you shut the truck off, from just an idle? That vid got me thinking on this...

 

[hondarider552]

Get a built engine first... :thumb:

 

[PACougar]

Get a built engine first... :thumb:

Don't be a *****, go for broke:roflmao:

 

[hondarider552]

:roflmao:

 

[Hot COCOAL]

Get a built engine first... :thumb:

I'm workin on it, got a block being prepped for shipment

Don't be a *****, go for broke:roflmao:

careful, don't tempt me. My wife would beat me though, prolly with a bat:violent::nunck::boxing::nod:

:roflmao:

Haha, you guys:hug:

 

[zebiraross]

Imo the 4294gtx. Since your hp limits that your trying to achieve fall easily under that turbo. I don't see any reason to go with something bigger when it's going to sacrifice throttle response and increase lag. Glad to see you going ball bearing!

 

[Hot COCOAL]

After some in depth research, for my intended daily driven hp goal of 625-650 my engine will need appx 88 lbs/min air flow and be working at a pressure ratio of 3.8 to 4, so looking at the maps, and all things considered, the gtx4294r fills this need perfectly, according to the turbo map it puts the point of 3.8 and 88lbs/min at roughly 78-80% efficiency in the largest efficiency island of the map, giving the broadest range to work in, and from what I can tell, I won't have to worry about choke either until somewhere around 105lbs/min and closer to a pressure ratio of 5, which should be about the 800-850 hp mark I have as a maximum power goal...but I don't understand the whole choke and surge points all that well

It would be really cool if someone smart could double check this for me and either confirm or deny my findings, cuz up until last night I had no idea what I was looking at, and today, I still really don't know what I'm lookin at, and how it may apply to real world applications. I just have some information to plug into formulas to guide me into confusion:roflmao:

:angel:

Thanks to anyone who will take the time:thumb:

 

[Hot COCOAL]

http://www.turbobygarrett.com/turbobygarrett/sites/default/files/PDF/DieselTech.pdf

Here is the link from Garrett where I found the formulas and info to explain how it works, and Garrett won't let me cut/copy and past the maps for the gtx4294r from their site, it just takes you to the pick and compare page, sorry

 

[PACougar]

http://www.turbobygarrett.com/turbobygarrett/sites/default/files/PDF/DieselTech.pdf

Here is the link from Garrett where I found the formulas and info to explain how it works, and Garrett won't let me cut/copy and past the maps for the gtx4294r from their site, it just takes you to the pick and compare page, sorry

Did you read the info from that link? Garrett practically works out your exact situation and suggests you go with a 4202. If you want 850(I understand it's not your DD goal) I don't think you'll be pleased with how hard you'd have to work that tiny 4294. Of course you could always add some spray and gate the 4294. Don't forget those HP number Garrett is suggesting for the turbo's are at the crank and the 4294 max's at 950.