Twins on an LS-1

[S10xGN]

Hi All,

I'm looking for ideas on a twin turbo blow-through carburated setup for my LS-1 powered '47 Ford project. I hear I can use a pair of (inverted) truck manifolds. I'll need a pair of turbos to mate up and a good blow-through carb (Carb Shop?). The carb set-up has a programmable box that uses the LS-1 sensors for spark control. I'd prolly not run over 8 - 10 PSI and no intercooler, just a Razor alky kit for knock control.

TIA!

 

[CTX-SLPR]

if you aren't terribly concerned with flow, though the Gen III and Gen IV stuff has some pretty slick manifold. You could get header stub flanges end mill them to the log diameter you want and make a stepped log on each side then run the tube off the end whereever you wanted to mount the turbos. Just thinking about when I was considering how to make headers for my junkyard twin turbocoupe turbo V6.

 

[chevyII]

Why go carb? do the injection and and a fast and be able to keep the tune safe. I have heard of just flipping the stock manifolds and bolting on the turbos. Might have to make an adapter plate.

 

[NJVetteGuy]

I wouldn't use a carb on your setup, with FI you want a good EFI system for engine management. I may have a line on a complete Accel Gen 7 for an LS1 if you're interested.

 

[CTX-SLPR]

screw the aftermarket.... keep the stock computer and use LS1edit on the computer yourself. I still occasionally try to think of how to make an LS1 computer run a B455. But that is just my bias against speed density systems coming out.

 

[John Wilde]

If you are going carb use a CSI piece and you shoud talk to Jim Flipowski.
If you are to use the stock computer try a Maft Pro.
The guys are Stenod have gone 8.9s in a small TT LS1 at about 3500lbs.

 

[S10xGN]

How's this?

• I got the motor minus electronics.
• I don't want the constant hassle of "tuning"
• I relish the simplicity of the carb.
• Minimal wiriing to detract from appearance.
• Trying to balance costs while still providing performance.

 

[S10xGN]

OK, another question. Does not depend (much) on carb or EFI. Which turbo(s) should I look for? Just looking for instant spool and 10 PSI max...

 

[gnx7]

I would run the stock LS1 or LS6 intake on a budget turbo LS1. LS1 intakes are a dime a dozen and a used LS6 intake sells for about $350 shipped all day long. No point in going carbed IMO. There are quite a few people making 1000rwhp thru them with ported stock TB's going low low 9's in 3200lbs+ cars..... they work. Just have enuf injector!

Tuning for the stock computer is typically done with either LS1 Edit or HP Tuners. You can dump the MAF sensor and go full speed density. The LS1 computer is miles ahead of the GN ECM.

Best bet would be to install some 6.0 heads on the LS1 shortblock. They will lower the compression to be boost friendly. GM "MLS" head gaskets is what most run and a set of ARP head studs are good insurance. Stock LS1 pistons seem to be the weak link and beyond 550-600rwhp you are on borrowed time as the ring lands seem to fail.

There are a few guys running $200-300 "OBX" generic eBay intercoolers making 700rhwp+. I would plan on plumbing one into your setup.

LS1 block after lots of street miles making 700rwhp+ seems to get the bores out of round and you lose ring seal. In a race car application this will probably never happen and a few have made 1200hp+ going low 8's at 170mph+ with stock crank/hi perf rods/pistons. The LS2 alum block (4.0" bore) with stock crank, cheap $400 Eagle rods, Diamond pistons has been proven to 1000rwhp reliably. In about 1 month the '07 Escalade alum block will be out with a 4.065" bore (416ci with 4" stroker crank).

LS1 technology is pretty awesome with lots of interchangeability, individual coil packs per cylinder, strong factory cranks, and very good factory flowing heads. For $2200 you can get an AFR head that flows 320cfm and has a thicker deck than factory. 1000rwtq out of the box potential. or port the factory 6.0 castings which have been 8.0's@170mph+.