Compound turbo question/help

[3rdgenmike]

So, I have an 04 with a 6.7 swap, fireringed stage 3 head, arp625s, dual 10mm cp3s, flux 209% injectors and a fully built fmvb trans with a 2400-2600 stall. I have an s492, with 103 turbine and a 1.58AR feeding an s369, with a 73 turbine and a 1.10AR. I'm wondering, if it'll be better to use my s480 phatshaft with an 83 turbine and .90AR, instead of the s369. right now my drivre pressures are fine. With the converter unlocked, I have about 1:1.28 boost to drive non gated. With the converter locked I have about 1:0.85 boost to drive non gated. I would like a better charger that the s369 and better low end response. I think the s480, would fit well, but I'm not entirely sure. I do have a 38mm precision wastegate that I'd put on the housing for the s480 and vent that to the hot pipe to feed the s492. What do y'all think?

 

[jasonc]

Your going the wrong direction for better low end response. A 480 as a secondary charger is huge.

 

[bateman]

an 80 responding better than a 69? Man I need a common rail.

 

[3rdgenmike]

Your going the wrong direction for better low end response. A 480 as a secondary charger is huge.

When i had the s480 as a single, it spooled better than my s369 as a single. The 480 has a .90 exhaust housing on it a spools very well, where as the 369 has a 1.10 housing and is a little laggy.

 

[bateman]

Is a smaller housing on the 69 out of the question? Could gate around it if DP gets high.

 

[3rdgenmike]

Is a smaller housing on the 69 out of the question? Could gate around it if DP gets high.

I could, but I'd rather not spend the couple hundred for a new housing. Just being lazy and cheap. Already spent too much on this thing lol