I just looked at the compressor maps. Unless backpressure from the turbine is a significant issue (it might be, but I think the bigger issue is the compressor), you will be going in the wrong direction. I would upgrade to a GT3788R.

FYI, below are the compressor maps for the GT3582R and the GT3782. The GT3782's choke line shows even lower air flow at a given pressure ratio.

 

I will have to confirm with Intense/PowerLab whether they use(d) a genuine Garrett GT37R. I can tell you that having seen the Intense widebody G countless times, that the compressor housing is larger with a 4" inlet compared to the E housing used on the 35R. They run a screen on it and didn't fab intake piping for it. If the compressor was indeed the same as a GT3582R, I would think they would have offered the 37R as an option all along with the standard kit with the same E housing & intake setup used on the 35R. It would have made it simpler for packaging and marketing, if that was the case.

Like I said before, the Intense widebody G with the 37R was driven routinely on the streets and freeways at approximately 530whp DJ on 91 pump in the Arizona heat without problems or issues.

Also... Keep in mind that the 37R turbo wasn't listed on Garrett's website 2 years ago.

 

I do remember IP stated that back pressure from the hot side was an issue because Hal noted that the wastegate/boost control was struggling to maintain a consist boost level at higher boost.

 

A GT3788R will address both back pressure and compressor issues. The GT3782 will be a step forward on the turbine side of things, but be a significant step backward on the compressor side.

With the GT3782, you will definitely be operating well beyond the choke line to get the whp that you want. You'll need about 54-55 lb/min to get to 500 whp, which should be at around 11-13 psi (depending on your IC, and a bunch of other things). This is somewhere between a 1.75 and 1.88 pressure ratio. At a 1.75 pressure ratio, the GT3582R flows about 53 lb/min at the choke line. At the same pressure ratio, the GT3782 is only flowing about 47 lb/min at the choke line. The air coming out of the GT3782 compressor will be hotter than the air coming out of the GT3582R compressor, and thus detonation will become a bigger issue. Pump gas will not hold up.

 

OH SNAP! That JUST happened!

 

Sorry. I have to call it as I see it.

 

^^^^

One more thing, notice that the GT3782 has a smaller compressor trim value than the GT3582R (52 vs 56), which is probably the issue. If the trim on the GT3782 were higher, it might be OK, but according to Garrett's website it is not.

 

ya, that's a wild find. i guess checking compressor maps is key! I would have never guessed those flow rates to turn out like that on the 3782

 

Uhhhhhh... so which turbo do U recommend if i were to upgrade from my current PL gt35r for more power? :P

 

Gt3788r

 

Should have edited my question but how much HP is it rated for?

 

That depends on the size of the motor, the IC, and a bunch of other things. I am recommending it to the OP to get over 500 whp on something other than a DJ dyno using pump gas.

 

Well with what OP is running, out of all the turbos u guys mentioned which ones would be a simple drop-in fitment? I think anythin above a gt37r would require all new piping correct?
lol whoops saw that u guys ARE talkin bout the gt37 n gt37r.

And idk if im missing something but are u guys sayin that both the gt35r n the gt37r meet the chokeline at around 500hp?

 

the maps shows a .70 ar but the the kit comes with .82... will this make any difference?

Also, as intense has tested, the kit is maxed out at 650whp DJ on 118oct...so if u install a $500 meth kit then ppl should be able to push it beyond 500whp mark without worrying about the IAT. Another thing, wont running an e-cut out decrease the choking effect and increase whp?

 

For the GT3582R, the .70AR is on the compressor housing and the .82AR is on the turbine housing.

 

cost effective?be a gineau pig ....they claim 50 degrees.EDIT:general rule 1 degree=1hp


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.82 turbine should net you good gains.

Have you completed a compression test on your cylinders?

 

See Post #290 regarding anticipated hp. We are talking about the GT3788R.

Remember, when you say GT37R, you are only indicating what turbine is being used. Garrett offers the GT37 with three different compressors, and compressor selection is very important.

With respect to whether it is a drop in replacement, that probably is a question for the turbo kit manufacturer. I'm not sure whether any modifications would be required.

 

I just briefly reviewed the patent. The concept is to stick a heat exchanger in the charge intake system, and to cool the heat exchanger with cryogen. I would be concerned about the heat exchanger impeding air flow. See FIG. 1 of the patent and you will see what I mean.

The question is whether the cooling effect the heat exchanger is enough to offset the air flow restriction. Perhaps it is, I don't know. Personally, I would not waste my time with it unless someone showed me solid performance data with a turbo system, and not just a bunch of sales fluff.

 

Wow, did this thing get off topic in a hurry! You guys must be REALLY bored. A couple of things you should be aware of....compressor maps aren't a 'ruler', that says what it's limits are, but rather a guidline as to how they are meant to be operated. Every turbo I have ever played with (and that has been quite alot) has made to the tire, more than it was suppose to make at the engine. So use the map as a guide for selecting a turbo, but it is NOT a hard number by any means. A 35R WILL make between 620 and 660 to the tires, this isn't a question, it has been proven countless times. This kit has been proven to make 650's to the tire. No one said it was on pump gas, and who cares? If you want to make 650's to the wheels on pump with a VQ, that isn't hard to do at all. Doing it on a small turbo (like the 35r) is a bit dangerous because of the back pressure involved. I still wouldn't say it's impossible, I would just say it isn't recommended. People do alot of things that aren't "recommended" all the time.

FYI, the 37R in question is a 35R with a larger 67mm compressor wheel and a different compressor cover. Otherwise it's the same turbo on the 'hot' side.