Pair of basic s475’s would do it. Hell maybe even the s471’s. Tightest t4 housing maybe on the 83 turbines for fastest spool. 96 turbines may be too laggy for what you want but would make best power and leave room for growth. They do have an 87 turbine that could work but they usually are more money.
Instant spool would be something like those 7875’s or precision ls series 7675. They may get you there but be maxed out.

garrett def has some goodoptions but 2-3x the cost over a basic borg

 

Here's a Fairlane that weighs in at 4000lbs, albeit a much smaller cube engine, but I still scratch my head on this guy making it happen with a pair of Aeroflow 3582 66mm turbos...talk about instant spool

 

That fairlane is a weapon. I wonder if he's just pushing them extremely far outside their efficiency though and what would be gained by switching to something a bit bigger.

 

He would be pushing them hard to get there. If it is 4000 lbs then its gotta be making 1300-1400 whp which is a lot on 66’s even with a 357” small block. It would be more efficient with a bit bigger compressors

but different application all together than a 518 bbc. Gonna be way different turbine and compressor

 

Depending on how close online ET calculators are 1600 whp. I can’t begin to fathom how he is doing that if the info is true.

 

LOL, now I'm really baffled...T3 turbos, 8.5:1 CR, and all the other stuff that most will think is a bit off for such a car. But as @Orr89rocz stated, he must be really pushing those turbos hard.

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I’m doing it with a pair of gen1 Precision 7675s on a 540. It made 1200whp on 19psi.

 

How do those turbos spool when street driving and not on the brake? Can you tell me about your engine combo? Thank you!

 

Doing some more research and so far leaning towards the 372SXE's or the 374SXE's. Still going to keep researching but what kind of pros and cons would come with a set of these?

 

I have a pair of the SXE 371's with FI wheels on my 370ci LS for the truck. No numbers yet, 3 years on the build. It will be out in the spring hopefully, you can see them in the build thread.

 

You can get a custom s300 with a bigger turbine wheel like a 73 or 75 that would be much better to work with your cubic inches than a standard borg 68 wheel. The thing is, if you're willing to spend for turbos from Forced Inductions or Work Turbos or the like, you can buy ball bearing Garrets or Precisions for very similar money and gain spool time from less rotating weight and roller bearings, while reducing the weight and overall size of the cheaper stuff. And generally no wait time, for those. A properly designed cam for your combo will go a long ways in making driveability better, as well. I'd be looking at a Garrett G50, myself. How important the cost of the turbos are is a large factor in my opinion. I would suggest a boost controller with a C02 bottle to operate the wastegates, also. Relying on (varying) boost pressure to operate them can be frustrating. The little aluminum bottle and regulator with some plastic lines don't weigh much.

 

What is the budget? A pair of the “next gen” VSracing 78/75s would do it with room to grow for less than the cost of a single precision of the same size. They also have them in Mirror Image, which I think looks MUCH better. Great track record with them holding up over the years. I run a set and spool them easily with 323 cubic inches. The “spool” is mostly in the converter. You have more than enough cubes.

 

Those next gen 7578 VS racing turbos. How do you compare a set of those against some Borg Warner 372SXE’s? I see they are both journal bearing.
Are the VS turbos bigger in size and capable of more power over the 372’s? I think the pricing is pretty close to the Borg warners?
Appreciate your input

 

I "only" weigh 3500lbs but I've been 7.95 with (5.12 1/8th) with a 363 SBF with Precision 6466 T-3s using an AODE. A few weeks later it went 5.06 at an 1/8th mile race so that would have probably been a 7.8 1/4 mile. Those were with around 30lbs boost while still sorting out the new turbos. A few weeks ago I went 8.08 with only 24lbs boost letting up just past the 1000ft because of tire spin. Honestly, I suspect my car at 3550lbs could probably go 8.6x with these turbos. This is with full exhaust including tailpipes and K&N inlet filters. I mention the inlet filters because even though they are rather large I'm sure they are reducing the capacity slightly.

Regarding spool, from idle, I hit my "target" of 3800rpm & 6lbs boost in less than 2 seconds.

That Fairlane in the video is pretty awesome, I'm sure he's pretty much maxed out that combo. However, they described it as "one of the quietest 7 second street cars". Next to my car it would sound like his car has open exhaust.

 

Any recommendations on who to check out selling turbo headers for a 67 Chevelle. It's only a 8.50 cert car so no bars going into the engine compartment. Has global west A-arms and for the most part a clear engine bay.


I plan on running the turbos to the inside head lights hoping to be in a position to run full exhaust. If this isn't doable I'll run the pipes out by the front tires like we see often.


Headers?

 

You could check out GP Headers, Stainless Headers.com , Stainless Works etc.

Holley might have some cheap ones ?
the flowtech ones are amazing bang for the buck for an LS. Speed engineering also has a cheap set of down and forward ones.

Any recommendations on who to check out selling turbo headers for a 67 Chevelle. It's only a 8.50 cert car so no bars going into the engine compartment. Has global west A-arms and for the most part a clear engine bay.


I plan on running the turbos to the inside head lights hoping to be in a position to run full exhaust. If this isn't doable I'll run the pipes out by the front tires like we see often.


Headers?

 

Flowtech headers are the best deal going on universal turbo headers. The ones I have used on LS engines work up/forward or down/forward. They also offer them in SBC and SBF versions. They are tig welded, have flow cones in the collectors and come complete with v-band flanges. I have shortened the collectors and welded v-band flanges back on to save some room but otherwise they are good to go right out of the box. This is a customer's car I did a while back. 6765 Precision Turbos.