JakeFusion

iTrader: (7)

In talking to some of the turbo guys in the past, the 84 and 85mm wheels work very well with the 4" stroke combos... but they are designed for really big power. I think the 85mm spools even faster than the 84 as well? But my question is, how will the S484 work on the 383 on the street? Would it be better do to the S480 or S476? Was originally looking for 800rwhp in an efficient package for the street and probably some half-mile events.

Anyway, I had been trying to decide between a T4 setup and something small like a PT7675 or a Chinese 7875 and then I cam across the SW 1-3/4" Down and Forward LS Headers that allows A/C and everything to be retained. I talked to my fabricator about it and he thought we could run a BW S400 chassis with a V2 race cover and a stood up radiator with no issue. I tend to agree based on the pictures I've seen. I'd run a 4" DP drivers side back to my True Duals and fab up a reverse Y to my Kooks True Duals.

So that sort of opened up my eyes to doing something like this. In part, because the price difference for what I was looking at doing with a PT7675 and the S400 is pretty close. So I'm deciding to just go ahead with the bigger turbo/engine build which should make for a more fun street car. I'll be keeping a level 7 FLT 4L60 for now... supposedly good to 950rwhp or so. After that, they want me in a 4L80. Since I'm using it mostly on the street, I think I'll be fine for a while. Especially if in low boost it's around 750-800.

Hot side would be SW 1-3/4" turbo headers, 2.5" collector, v-bands, to 2.5" necking down to 2.25" crossover, T6 flange. 60mm WG. 5" reducer to 4" downpipe back to Y to 3" true duals with Dynomax UltraFlo SS mufflers out the back (hope to be quiet enough but with no backpressure issues).

Cold side would be with the v2 race cover so 3.5" v-band aluminum cold side to a Garrett 27.8x12.7x5.1 intercooler core, 50mm BOV (maybe x2?). Thought about the 4.5" Garrett core, but the price difference is only about $150 for the larger core.

Engine would be a K1 Forged Crank and Rods, Wiseco -15cc Pistons, H13 pins, ARP Main and Head Studs, LM7 iron block punched to 3.903, LS9 gaskets, TEA LS6 heads, BTR Stage 4 Turbo Cam 234/239 115+5. CR would be 10.1:1. So off boost, would be pretty responsive.

Fuel would be Racetronix twin 340 pumps, -8/-6AN lines, billet rails, FPR, and Bosch 95lbs injectors. With Alkycontrol twin M15 100% methanol injection and 93-octane.

FLT Level 7 Transmission and FTI 3600 Triple Disk Turbo Converter, 3.5" aluminum driveshaft, and Strange 12-bolt with 3.73s for now (may move to 3.08s or 3.42s).

Any thoughts? Since I have a lot of this stuff already, it's sort of where I am...

Photochop

iTrader: (74)

A 383 is going to like the larger turbo if you can fit it. It'll make the 800 tire you're looking for easily, and probably 1k turned up. You won't need near that much gear and you'll want to switch to either gear you mentioned. If you go with a 3.23 or 3.08 and run a 28" tire, you don't really need OD and you could save some bucks and weight going with a TH400 down the road.

JakeFusion

iTrader: (7)

That's what I was thinking. TH400 would be a very stout deal.

JakeFusion

iTrader: (7)

Other thing I looked at but am somewhat deterred because of the cost and reliability issues is the PT8891. It has the 91/100 exhaust wheel in a T5 1.08 turbine housing. It may package a little better than the S400 chassis, and may be suited well for a 383 type of application. I think Tick took a Foxbody with a 383 and the PT8891 to 5.13@138. So it works. Just wonder how it works on the street?

Tuskyz28

If you do things correctly Jake you can make a 1000 horses. Here is the proof.

https://bangshift.com/bangshift1320/a-cool-g-part-deux-our-383-ls-gets-boost-and-makes-over-1000-horsepower-for-the-street/

JakeFusion

iTrader: (7)

What PTE76 is that? 7691 or something? Doesn't say. But it makes a lot of power on a 383.

Tuskyz28

Good question.. I'll Have to reach out to Richard Holdener and ask him.

Luke19901

have gone 850-900rwhp on that turbo and good flowing manifolds on 2 separate cars. one cam and springs SBE 6.2 LS3 and one cam and springs SBE 6.0 L98.

both TH400 and 4500 rpm converters and on E85. the stock engines were the only reason I didn't push harder as the turbo had heaps more to give

6.0 12psi 720rwhp 17psi 900rwhp
6.2 15psi 850rwhp

the LS3 car ended up with a 403 cube iron block and same turbo. 20psi made just over 1000rwhp

that turbo is capable of big, efficient power as a single on an LS

JakeFusion

iTrader: (7)

Those are good numbers. Bewley said it was a 1200HP turbo and was overkill. But at lower boost levels it's doing a lot of work without heating up the charge.

01ssreda4

iTrader: (96)

I would sell your intact 60e and converter now. Go ahead and get something reliable (more). I would also not choose a th400 for a street driven car. Having a 1.1 with no lockup is obnoxious.

JakeFusion

iTrader: (7)

I know. I don't love the 3.73s and 26" tire even with OD. Mainly cuz the car is loud.

Turbo fixes that. But plan to go 3.25. And probably 28".

I'm relaxing on the idea of the huge turbo tho for more of a driver. A PT7675 and a 5.3L is an 800rwhp combo. The 60e could live there for a while.

It just means I have to start all over again when I want more power. But at some point, a street driven car with A/C just can't do 1200rwhp with any sort of setup that I'd like. Maybe an F1 on a 427 could do it. But that will take a new car dedicated to power to ever do that, for me.

AutomagicLS1

iTrader: (18)

I went from a s484 1.58 a/r to a s491 1.32 a/r and the 91 lights off almost identical to the 84. this is on a 408 ls. Also very manageable on the street