gtx 4202r whats the back pressure and

[sideswipe]

That's why I'm asking I know my truck won't be the same just a range of what I might get. If don't ask don't know. I'm learning.

 

[Big Bore]

I'm still wondering whats wrong with a 38R in this application?

 

[sideswipe]

Well to me people are Maxxing out that turbo pushing 500 I don't want to be pushing the turbo wearing it out faster. I would like a happy medium. Other than a 4202 r. what would you use not straining the turbo at that power level.

 

[Dieselboy.]

K, seriously. Weve told you, the 4202 is a big turbo. Capable of well over 500HP more like 650+.

Its not for the faint of heart. I garuntee a set of 250/100s and an s366 or gt38r and you would be happy. Above that you start having drivability issues ! No matter what you do. Until you go compounds. And those bring a whole other ball game of issues.

We understand your new and most people wish for the high HP truck, but it is alot of behind the scences work over 500HP.

Ask any guy who has actually stepped up from stock to mild to hot street to stupid. Most will say their favorite combo was the one I mentioned previous.

 

[smoker00]

With 250/200 I think a person would have to gate around a 38 or 366 for sure.. but would spool stupid fast..

 

[sideswipe]

Okay would a s467 work better.

 

[smoker00]

OK what do you want to do with the truck race/pull/dd The GTX TURBOS Are as good as you can get with out going custom do some more reading and see what works for your best app. Good luck bud..

 

[TARM]

K,

Have you ever driven and run a truck with 500 HP WOT, flat out, boost launch? I would suggest if you haven't at the very least take a ride in a rig regardless of the manf and see what that feels like. I have never seen a first timer that was not VERY impressed.

At the very least if you still decide to go with the "go big or go home" thing which maybe what you really want, then consider stepping down one step to the GTX4294r. Combined with a 1.15 housing IMO that is the ultimate single turbo for the street. That combined with a 100% or max 200% nozzle 250-300cc will give you spool up very close to stock. Enough power to blow the tires off @550-600. If you can for sure get lived tuned then 200% might be the right move for you. But understand at these power levels and if you like stomping on it frequently you are going to be putting serious strain on the drive train and things will be breaking and need to be replaced. Pinions, Driveshafts, Axle stubs, locking hubs, better have a built trans for sure, not to mention what can happen to any engine with big power.......KabOOM!!! LOL

That X4294 is scary quite as far as turbo whine goes. All you hear is the huge vacuum of sucking air but no whine. Lites down low very well, comes on smooth, and when you jump on it it really takes off. It also tows well from what I have been told.(haven't towed heavy with mine yet.) But this is still a good size turbo and puts out a lot of power and you have to have ALL the supporting mods IMO when you go with this kind of turbo injector combo.

 

[Milford]

Imho a 38r is to small for 250s. That would be a lot of strain on that turbo. I but I personally would want a larger framed turbo for anything bigger, not sayimg it cant be used with 238s because many peoppe love that combo just saying i would have more comfort in a 42r or an h2e modded with 250s for sure. Proven combo and proven to be reliable it seems.

 

[TARM]

Its actually the nozzle size not the CC volume capacity that dictates fueling rate. 80% 100& 200% nozzles A 38R is a very good match for either a 80-100% nozzle with typical 238-250cc capacity.

 

[sideswipe]

So 4292r would work well with 250../200 yes i like to play once in a while but go crazy with it. Thanks I'm learning what turbo would work well with those injecters

 

[Milford]

Gotcha. Sorry i have been out of the game for a good while and well if there was a refresher to take id be takinh it. Im back cause its time tuo sstat buying products for my truc but my goal is 600+. Thing is a weekend driver and have a car on the side and will have another truck if a dd is ever needed for me. I just really like what you and vander have said about the x4294r tarm.'

 

[sideswipe]

tarm does that come with a billet wheel thanks thats what i was looking for exactly. So now i have some thing to go on now from there would a cam and
heads worked over would that help in exhaust temps. Also i asked about a aftermarket intercooler would that help at all with the bigger setup for sticks
and that turbo and the heads being done.

 

[TARM]

Yes its a billet wheel. Just remember though a billet wheel only means that it was made on a CNC from a block of alum not cast. It tech has nothing to do with better flow. Now of course why is the reason you go billet in the first place? That is to get angles that may not be possible to do in a casting mold or you are doing very low numbers. The GTX wheels are made to have much better air flow and they are also very quite. They are both oil and water cooled which helps significantly with heat dissipation after shut down.


The GTX 4294 compressor charts show they come on and move down low just about as well as a 38R or stock and up top they are best the larger gt4202r. Combined with a 1.15 T4 They have great spool up speed and lite down low with good capacity up top to keep drive pressure s down. Honestly looking as some of the turbine charts and talking to guys that run them even jumping up to a 1.25/.28 has little neg effect on spool up yet gets you some more top end breathing room. I have not tried one this large myself yet but can tell you as far as singles turbo apps go when it comes to the 7.3 a 1.15 ratio turbine housing is the best match over all for this engine IMO. It balances the best between low and high end flow with a properly matched compressor to turbine wheel.



I think it with a 200% nozzle injector is a very good match. It of course would work very well with a 100% nozzle as well and run extremely clean would be my bet.

 

[MadDiesel73]

The gtx4294 is about as good as it gets for a single on a 7.3. It will work with 80-200% + nozzles. Spool like a 38r with the top end of the regular gt4202. The 4202 is too big And laggy for street driving.

For compounds there's no need to go bigger then a 62-66mm high pressure (38r,s366 etc.) your losing spool and not gaining top end by going bigger. Low pressure with 80-200% nozzles should be 80mm or bigger. The low pressure is what makes your topend power.

 

[sideswipe]

Sweet found thew turbo i want.

 

[Milford]

I'm with you sideswipe. Reading what tarm has to say about the gtx4294r makes this my choice also. Im just saving for hmax rods and starying my project off with a set of those. Go big or go jome!

 

[Short Bus]

By the sounds of things the 94 will be the better route for a dd. I really like the 02 but I think it could be a bit tricky to tow with due to needing a few rpms to lite. Once the Rpms are up its a very responsive turbo and acts like a much smaller charger.

 

[TARM]

have you gotten that motor on a dyno yet with the gtx4202 on there? I was excited to see how that turbo worked for you as I have the 94 version and love it. But you know how it is always wondering if bigger would have been better LOL

 

[Short Bus]

No dyno yet, he'll I havent put 1000 miles on it in the last 3 months lol. It's too smokey for my liking and if I don't drive it I won't have to work on it lol.