Hey Guys,

I need some advice. I originally was not going to go FI right a way, but than I bought one of those Ebay TVSs.

The problem is that I had already purchased some TFS 205cc heads by AFR. The Chambers are 58cc and if my math is right, I will end up with a static CR of 10.8. (Love it if someone double checked me.) LC9 Gen IV

I also am planning on putting in a Vinci Trucker Cam at the same time. 218./224 @.551 115 +4.

I've heard that those Rouch TVSs Run at about 9psi on a 5.3. It would be great if someone could confirm that who has installed one. I'm guess that my supporting mods will take that down a bit, which will be nice.

So my question is, will this setup run well for a DD? I don't plan on upping the PSI at all, so the stock pulley will stay in place forever.

Thanks guys,

DOA

 

It's all about the tune. If tuned well, you'll be just fine.

 

Thanks Man. What heads are you running?

 

Nothing special. These.

Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

 

Thats a decent # in compression. You go to low of a compression motor and it will be a sluggish DD when out of boost. But yea its all in the tune.

 

Can someone confirm my compression? Or that these dimensions are right?

Bore - 3.78
stroke - 3.62
gasket - .051
gasket bore - 3.90
chamber - 58
deck to piston - 0ish?
Piston relief - 0

Thanks

 

I come up with 11.65:1, with 0 deck, flat top pistons, using the above numbers.

 

-5 cc dished piston will give 10.725:1

 

-10 cc pistons will give 9.94:1

 

Holy cow, is that right? I have flat tops. What calc are you using?