I want the throttle response with the better powerband. I'd be doing everything at my buddy's shop and he does a lot of diesel work. I'll lean more towards the compounds. What's a good setup?
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You can get 500+ with a 38R, H2e, several different T4 turbos, a couple of different T4i turbo's and have very good throttle response. When you get past 500 rwhp, you need to start thinking of having a built motor with billet rods, fully balanced rotating assembly, etc. The 7.3 is the most expensive diesel platform to build serious HP with.
At lower HP levels (less than 650RWHP), compounds aren't really worth the time, effort or money. You can swap to one of the turbos listed above, get some single shot injectors, custom tuning, regulated return fuel system and an upgraded HPOP and be ready to roll at 500 RWHP for ~$6K(don't forget to start saving for a new tranny immediately after these upgrades...another $3-5K). Or you can do all of the above and spend another few thousand $$$ buying and installing an LP turbo to feed one of the above turbo's for no real gain in anything, except maybe slightly lower EGTS and a little more torque on the low end ( which you reeeeeaaaaally don't want unless you have billet rods and all). Don't forget the wastegates and wastegate controller. That's another couple of $$$K
Do you know anyone living near you with a 500rwhp 7.3? If so, have them take you for a spin in it. It's a ton of fun to drive. You don't need compounds, twins or a big single turbo to get there.
For DD....I'd look at a 66-71mm inducer single....then spray to your ultimate power goal.
I'm not seeing the advantages to a compounds setup outweigh the disadvantages on the 7.3. On every facet (complexity, scalability, engine bay access, cost, tuning,....I'm not seeing the advantage that compounds have over an equally professionally engineered nitrous system).
I mean...they look cool and all....but really...why not use an atmosphere turbo in a bottle...vs one that needs a wastegate, intake/exhaust plumbing, oil supply/return lines, and is inherently limited in powerband itself?
That's not bad advice all in all. You're not going to be putting 700 HP to the ground very often and keep your drive train alive and happy. The few times you do want the extra horses, turn your nitrous system on. I don't follow you on compounds being inherently limited in the powerband. Usable peak HP across the powerband is the point of compounds. Properly matched compounds produce a very flat curve across the powerband, without the risk of pressure spikes and malfunctions that nitrous poses. At least that's my understanding of the subject.
What's a good setup for what? 400 horse? 500 horse? 600+ horse? If you were serious about the subject you would already done tons of research. If you get past custom tunes I'll be very surprised.
:whs:
I'm with Bruce.
Buuuuut...here's my take. Build for 500-550, then lower the truck to a stock size tire, or 33" tire..it'll be faster, and more responsive than your truck on 37's with less power.
Best advise I've seen so far.
When I got mine tony wildman had tuned an obs with 71mm h2e that made 646 on fuel (as far as I know, nitrous wasn't ever mentioned in the conversation when I asked about it.) The setup was 300/200, 71 h2e and srp1. Don't know what dyno tho. Cary t knows of the truck because I had talked to him about it.
Do you have any track time with the truck? I'm always interested in comparing dyno numbers with time slips. I've found time slips to be much more accurate as far as estimating RWHP.
is there a good thread on compounds?
I know nothing about them
would an s483 feeding an s467 'work'?
Use the search feature. My best advise is to contact someone who does turbos for a living to get something that is properly matched for your application. Or take the advise that I took, after researching quite a bit and realizing how much I don't know, and see what others have done successfully and work from there. Do lots and lots of independent research and don't just throw two turbos together because some Joe Blow on a MB said they are a great set up. It might be a great set up, but research and verify before buying and installing.
