Turbo map help

[Pyro15D]

I had a question about reading compressor maps. I think I did this right but would like someone more knwledgeable on the subject help me out. This is a Boss Jr 60-1 turbo. I don't know if all 60-1 compressors are the same across the board; I just found this in google images and edited it in paint. Anyway, according to the thread on how much the 7m breathes under boost, I took the numbers from there and plotted them on the chart, using my datalog as a reference for boost/rpm. I got full 20psi boost pressure at 3900 rpms and it held till I shifted at 6200 rpms. My intake temp was between 55-57 degrees F (not that it makes any difference for this) and my AFR's at 20psi were pretty solid at 11:1. Anyway, judging from the chart I made, how well sized is the turbo? It almost looks to be on the small side, but like I said, I'm not very experienced with this.

 

[Suprapowaz!(2)]

Plot the same points on a T61 and you'll be pleasantly surprised. It's been known to be a good match for the 7mgte. Unfortunately, does not bolt onto the stock manifold. It's a T4 turbo. It's old technology too, as many here would point out. Still a good match.

 

[Pyro15D]

Damn that is a really good match. Just for shits and giggles, I plotted those points on the compressor map of my little brother's S366 as well and it looked alright too. Why don't people recommend the s366 on the 7m? I might have to break down and go T4 I guess! The T61 looks very promising.

 

[hvyman]

the 366 is a 66mm. Its good for higher hp 7m. The 360 is a 60mm and prolly be a good match for where your at with the boss jr. and the s363 is a 63mm. SX300 is the bw turbo line up for those sizes. there is also a s362 fmw with there billet compressor wheel fromt he efr series.

The efr series are all billet ball bearing and the bogger ones dont have internal wastegates.

 

[Pyro15D]

Hmm, okay. I might have to check out the 360. Thanks for your help!

 

[Suprapowaz!(2)]

What are your power goals? What's the car doing rwhp now?

 

[Pyro15D]

Well, actually I'm pretty happy as far as power goes right now. My 560cc injectors are right at 80% duty cycle when going all out, and at 11:1 afr and 20psi with full 3" exhaust and trust/greddy FMIC, I'm probably sitting pretty close to 350-400rwhp I'd imagine. I don't know though. I need to put it on a dyno. As far as goals though, I would kind of like a turbo that supports my power right now but is less stressed. If I'm reading that map correctly, it almost looks like I'm pushing that turbo too hard.

 

[hvyman]

Your at about its maxamium. Could prolly go a little more but it will run out of breath soon. Not bad tho for a bolt on turbo.

Any newer 61-63mm turbos with a good tune will get you apst 500 at those boost levels.

 

[Pyro15D]

Awesome, thank you both for your advice. I really like the turbo and especially how quickly it spools (I guess that has something to do with the fact that it has a .58 A/R on the turbine and ball bearings) I just don't like how far out of the island I am. I'm not seeing temps rise too high yet, but I don't really do long pulls either. The larger intercooler and better piping probably help quite a bit in that area as well.