Im trying to decide which turbo to go with on my FC build. Its between a TD07 23a or a GTP38? I cant find any info on the GTP38 (ford turbo deisel) at all, all i can find is an upgrade from garret which is ball bearing and 88mm wheel as oposed to 80mm wheel. This is the compressor map for the upgraded turbo, which should be similar atleast. Will this be ok to reach my 400whp goal? I'll be running on stock ports for the first season. That or stick with my TD07?

http://www.turbobygarrett.com/turbob...e_Comp_map.pdf

 

http://www.turbobygarrett.com/turbob...werstroke.html

You need to post the specs on the TD07. Garrett lists this GTP38R turbo as having an 88mm compressor wheel. For comparison, a BNR stage 4 (a Turbonetics 60-1) has a 3" wheel (76mm). This is a big turbo. Are you building a drag car? There's no point in running this thing unless you are running at least 20+ psi of boost. This is also significantly bigger than a GT35R, which should be able to do 400whp.

The 80mm thing that it mentions is referring to the stock compressor wheel on the 7.3L diesel.

 

i am building a drag/highway car. Sure the wheel is bigger than a GT35R but what will make power easily on an rx7 is a bigger question. I posted the map of the GTP38R because its the only map i could find that would be even similar to the GTP38. Plus i have the chance to grap a GTP38 for a simple trade of my wet NX nitrous kit. Which cost me 400 bones.


I am already in possesion of a TD07 23a. Which will make a good 400whp at 15lbs with decent spoolage. Im just curious if the GTP38 would be worth the extra cost to go with. Keeping in mind im more for big hp fast 1/4 mile as opposed to spooling and street driven fun. Street driven fun in my mind is running a good time at the local track while driving home.

 

What kind of hotsides are on these turbos? When you say "TD07" are you talking about the GReddy TD06/07 turbos? Or are you talking about a cummins diesel turbo?

 

he cant be talking about the cummins turbo when they never came with a td07.... the baby cummins has a holset hx35 in it..

the hotside AR on the powerstroke turbo is .84. you see how useless these numbers are?


the biggest problem you will run into is the powerstroke turbo is reverse rotation.

it is made for high boost though... 1 bar+ all day every day.

 

turbo deisel build boost at idle pretty much...LOL

 

IIRC the ford turbo has a ford specific turbine, which means you would have to make a crazy custom manifold. also it has a funny size hotside, which might or might not work well on a rotary. Why not try to trade for a more standard T4 turbo?

 

yes but that is because diesels flow very high cfm at idle, not because of anything to do with the turbo. 7.3L is a lot of displacement too...


also slpin cummins owns holset, cummins engines only come with holset turbos that i know of.

 

When i say TD07 im speaking of the mitsubishi TD07 23a. Not the garrett counterpart. Although my TD07 is missing the hotside so i'll need to purchase a garrett hotside if i do decide to go with that.

 

The hotside on the 7.3 deisel Garrett GTP38 that is in question is actually 1.15AR and not internally gated. Im kinda confused on that part. It also currently has an exhaust brake attatched to it. I emailed Garrett to try and get more information on it, but they havnt replied yet.

If anyone has a good hook up at Garrett and can find out some info on it for me id rreally appreiciate it.

The Product number is: 1831434C94
The Serial Number is: NDDL27868

Thanks

 

Can you elaborate on the reverse rotation problem? Im confused.

 

Problems I can see from the reverse rotation are-

Can't swap exhaust wheel or hotsides w/ anything else.

Can't swap compressor wheel or cover w/ anything else.

In other words if it doesn't match up to the rotary well as it is, it would be VERY hard to change it.

If you did something like a TA45 that the Aussies like for drag there are lots of parts to interchange- they even make T4 exhaust housings for them.

 

thats right! thats why when he classicauto said greddy and asked if it was a cummins turbo, i was like.... lol that dumbass lol omg lol

 

does it look factory or aftermarket?
the factory uses a flapper which blocks the outlet to increase the egt to warm the engine up. that is not an exhaust brake, and navistar doesnt use it as an exhaust brake either.



hold a turbo in a mirror... yeah see how the housing is clocked a different direction? yeah, thats reverse rotation



also, the navistar turbo have a weird circle housing... maybe you could weld a pipe directly to it! omg lol

 

I just don't understand why you want to run turbos that are completely unstandard for this car. It just makes the whole job a lot harder, when there are more common turbos with more common parts available that will do the job.

 

those more common turbos tend to be very expensive.


I think you'll be happy with the TD07, I have a TD07-25A (greddy/mitsubishi turbo) and I was making the "easy 400hp" at 16psi... never did dyno but was enough for a 11.6 and a best trap of 133, so yeah some decent power.

And as the above poster mentioned.. it's not a weird funky turbo. Mitsu turbos are cheap to rebuild and parts are easy to find. Just expensive to buy initially, but it seems like you have that out of the way allready! (and still cheap compared to the "modern" GT series turbos)

I'm upgrading to a GT42 this year though. 400hp was fun... for a while...

 

What hot side are you running on your TD07 25a? Mines a TD07 23a and im missing the hotside. I am planning on getting from Garrett a T4 footprinted 1.0 a/r hotside for it... what would you reccomend? And when do you plan on upgrading, because cheap hotsides are hard to come by, Garrett wants 250USD + shipping and im in canada so thats probably another 50USD.

I think i'll stick with the TD07 if your trapping 133mph wiht a 25a. The shear size of the GTP38 is just soo tempting. I mean who knows what it could do on the rotary. And i have an opertunity to grab one fairly cheap.

Small update on the GTP38, turns out its non bb, and off a 7.3 Van. This explains the larger hotside and lack of internal gate. It is in really good shape tho, so if anyone can find a compressor map, id be really interested.

 

you stockport?

you don't want a turbo with an internal gate anyways.


I have a wonderful trust WG, and I've never experienced boost creep with it, ever, even a tiny bit, when itwas set at 8psi.

I don't know what hotside exactly is on my 25A, but it does seem to have a nice combo of spoolability and reasonable topend - my car runs out of breath a little short or where I'd like, but still about 7000-7500rpm. We'll see how the GT42 compares.

 

t-rose, that turbo sounds like it is the non-wastegated ones....
do you know what year it is? i might buy it off ya...

 

its off a 1998-2000 7.3L Powerstroke. Im still unsure of which turbo i'll be going with, but shoot me an offer, we'll see where that takes us.

 

yes im stock port, but that'll change eventually. Id just like to get the car up and running with a nice set up for this summer. I wont mind if im having troubles spooling the beast for the first while. Aslong as the potential is there later.

Are you stock port ? What do you spool the 25a around? Im guessing the 23a will be similar.

 

Here's a Diesel turbo for you.