LB7: 4094 install. need help

[paint94979]

what size turbine housing you got?

a .85A/R will drive the trubo harder then a 1.06A/R unless you plan on shifting round 4,000 range

ya I have the 1.06 a/r

 

[malibu795]

ya I have the 1.06 a/r

that is probly your answer

448375-18 is the .85
448375-19 is the .95
and run 300-350 for a turbine housing through forced induction..
i plan on buying a 4094 with a .85A/R and waste gating it so it will live with 4,000rpm shift points

the down side to running a smaller turbine housing is high EGT in upper rpms. the good side is increase trubo response and come on sooner.

i know deiselson is running a .85 on their 4088 and ppe tuning and see 40+psi not spiking.

 

[ripmf666]

I get 40 out of my 4094 witha 1.06 a/r I can spike 44 psi sometimes

 

[JoshH]

Is that with dual fuelers?

 

[ZeroGravity58]

i had mine out tonight and i was seeing 40 PSI and that is with the 1.06 A/R also. I going to take it back to the track really soon just not sure what day i wonder what i picked up power wise by changing the turbo?

 

[ripmf666]

single cp3 Josh

 

[sweetdiesel]

interesting I'm seeing nowhere close to 40psi mine topped out to 30psi

its probably the tune Nick,But i bet that 30 psi is better than 30 psi on the stocker Tuning the timing made a world of difference on my HTT
cranking the waste gate never did anything really?
PPEs tune on my friends truck would hit 40 psi easy with a HTT

I think the more important thing is shifting and keeping the boost up over the actual number of psi

Im sure Adam has looked at a map for your turbo and could tell ya where/what is the best number

that is probly your answer


the down side to running a smaller turbine housing is high EGT in upper rpms. the good side is increase trubo response and come on sooner.

.

and im willing to bet higher drive pressure?

 

[malibu795]

you can run the waste gate of either drive pressure or boost


a small non gated housing will have higher drive pressure on the top end

drive pressure is not evil simon

 

[sweetdiesel]

you can run the waste gate of either drive pressure or boost


a small non gated housing will have higher drive pressure on the top end

drive pressure is not evil simon

Adam this is OT but the DP on the htt was always 1:1 no matter what i did?

Stock tune stock turbo would run average 1:2 and as high as 1:3

ive heard guys running big turbos with 1:3 average 180 psi +DP and changing the A/R helped

Adam i have lots of DP data,but not a lot of info,you say not evil?whats evil and what the best?

 

[malibu795]

i should have worded it better simon

i know we have talked about it before... im going to call some turbo companies to find out.

i still think 1:1.7 and higher is bad