Wanting to build something different for a 1952 Plymouth I have, I've decided to build a 4.2 Atlas (Trailblazer). I have a S475 T6 1.10 83mm turbine left over from another project that i've thought about using. Match Bot, and hp/tq numbers say it should work, but it definitely seems like a stretch. What do you guys think? It will be a street car with a th400, 3000ish converter with a 3.73 gear and 28-29" tire. Engine rated at 291hp@6000, and 275 ft lbs at 4800, but it has a super flat torque curve. Stock trailblazer 4x4 rear wheel dyno info below. #ad

 

https://www.borgwarner.com/go/Q2OGM6 I haven't really played with the Match Bot much, very good info.

 

https://www.borgwarner.com/go/Y3JS61 A .90 a/r turbine housing seems to be the ticket, i'm going that route.

 

You need to match the engine VE to the dyno chart you have, its a 200hp engine and I think your intuition about that turbo being too large is correct. Once you do that the turbo looks like not a very good match. Lot of time left of the surge line. How much boost are you planning on running on this?

https://www.borgwarner.com/go/YWO369

S361 looks like a great match, which is more what I would have expected, check that out.

 

I believe my ve's are close. That was a rear wheel dyno, through an 4x4 on demand t case. It's only 256 cid factory rated at 275 ft lbs, and 291 hp, that's got to put it at 100+% in places. As a note, the Match Bot defaults are higher than the ve's I have entered, I did some math and lowered them a bit in places.

 

OhI misunderstood, I thought that was an engine dyno. I'll be interested to see how this turns out, I have no doubt you can make it run.

 

I sure hope so. The more I played around on Match Bot, the more certain I was that it's feasible. The hp/tq numbers support it, and I actually found someone with a 7875 on the older less hp rated engine. Just to be sure though, (and give me more options) I ordered the T4 .90 turbine housing, and have started on a divided log to go with the twin scroll housing. It's something different, and the S475 will definitely give it the awe factor if nothing else.

 

I think it is not going to be a whole lot of fun as to me an s475 on a stock lq4 feels laggy, cant imagine it on something that small. With that being said that is still a very desirable turbo and surely the correct size t4 housing, so easy to sell and replace, so what the hell, why not! I think the 7875 would be a lot more fun

 

This is the 83mm turbine wheel version, so the wheel sizes are actually smaller than a 7875. Match Bot is showing 10 psi at 3000-3500 rpm, and it'll have a 3000-3200ish converter. This little motor makes nearly the same hp as an early LQ4.

 

Fair enough! It is always interesting to do a build which is way different from the norm, sounds like you've done your homework and will get good results, keep us posted