A stock H2E will not make more power since its a smaller turbo.

I have never seen a STOCK H2E make more than about 425 HP..

 

I am glad I got my 38r shipped for $1090 to the door no brainier for me. Thanks Mike (BPP).Also I know a few thats running over 500hp with the 38r but if you want to go higher yes go with the H2E Mod or better + supporting mods. How much do you want to spend is the ? plus as stated look at the pressures. You don't want blow.

 

Very interesting. Not to mention the modded one lags like a dog so then you throw fuel at it and then the street manners go out the window. Or so I have heard so don't bash me on that one.

I have not heard that the 38R has a snappier response because I have that one. It does lag a bit with the 1.15 housing in mine in the lower tunes but anything over the 100 setting forget lag. My drive pressure is not a problem with the housing. I have not seen the surge. I do hear the whine.

There are some good prices being quoted for a new 38R here.

I suppose I could dig up the turbo maps, again.

 

Your welcome Eddie, i,m still smiling.

 

I have the 1.15 and I have no lag or surge at any time in 80E or above. In Modified stock it has a little lag. Yes I have the sweet sound of the 38r all the time

 

Well Unfortunately since I ran out of my subscriber status, and am currently in financial binds preventing me from becoming a supporter again right now, I cannot attach the two maps that I have of both turbos(GTP38R + H2E) that clearly show that the H2E outflows the GTP38R. I didn't realize that this was a question. . . but the H2E is a larger more capable turbo. If you want my opinion. . . the H2E or a similarly sized turbo is a better choice for 400+ applications. Its stable, not working too hard, just a damn good setup in my opinion. Anything larger in HP range requiring larger than and H2E in my opinion needs compounds to be a nice streetable setup without crazy amounts of lag and smoke. This is my opinion having run compounds. and currently running a fairly high HP H2E.
Timmy

 

I hear you Tim. Seems to mirror what I recall from the maps I had before my computer crash. Let me see if I have those in the recovered area. Nonetheless, folks I have spoken with have pointed out a decided lag in the H2E and more so with the modded one. Making up for that lag makes the truck less daily driver friendly but that is just what I have heard and not experienced. Hope your financial situation improves, and soon.

 

OK, here we go:

H2E 400-500HP calculation plot:



The stock GTP38R from 400-500 (stock housing):

This is using old school calculation math from the Garret turbo 101-103 section off of their site for a 7.3. Feel free to wear you brain out and recalculate it.

I don't pretend to interpret data but look at what ratio things happen for 400hp. That is where I began looking. It seems obvious the H2E has a much greater top end. I have a not stock 1.15 housing GTP38R and have no map for that as well as a modded H2E map. I generally run a confirmed 1 to 1 drive ratio when on the turbo with my setup. Very safe and low EGTs. That also involves tuning along with physical characteristics. It also seems clear that the H2E has a higher HP potential just looking at the maps and my calculations.

As for real world, that is where things happen.

 

Anyone want to PM me some info on how to read this map.. Andy simple boy...

Thanks guys.. how bout a 42R or GT45 vs. a H2E

 

Go to the Garrett site and read. It starts simple and then gets hard. I have not seen maps for the first turbos you speak of but have not looked. A real clever person could figure it out from the housing, impellar and compressor size. Bet there are not that many clever folks here, including myself.

 

I have a modded H2e with standard hybrids and now 100% over nozzles. There is 0 lag issues with this turbo and hybrids. at 48#'s boost I am sitting right at 50-55#'s drive pressure. I also have a 19cm housing to try at some point, but I need to get her back on the road first.

If I had it to do over, I would not have spent one dime on a drop in turbo. Not a modded stocker, TN, or 38r... H2e or other is the only way to go.

 

That is good first hand on the road info Joe. Wait a minute, why isn't it on the road?

 

Alright, i'm reading on Garrett's website.. I am assuming that you want your boost pressure vs. drive pressure ratio should be as close to 1:1 as possible?

What is the HP limit on that turbo? I am turbo shopping at the moment and I wanna hit 500-525HP.

Thanks

 

If you want those numbers, the 38r won't cut it. You're getting into that mod'ed H2E range.

 

The drive pressures you guys speak of, is there a test I can do to test mine to see if mine is in range?? How did you all test yours?? Thanks.