KB2.6 w/ mods--- what lower to use?

[IACobra]

2004 Cobra....current "stuff:"
- 2.6 KB, 3" upper
- stock lower
- Billetflow 4pc idlers
- NGK TR6 plugs
- 60# siemens injectors
- KB throttle body
- MaFia
- KB Boost-a-pump
- JLT RAI
- LDC cooling mod
- Magnaflow cat-back
- Nitrous Express kit- currenty not hooked up- had it hooked up prior to the KB install
- other suspension and driveline mods...

Currently making 585rwhp/537tq, 21.53lbs boost, on conservative tune on 92 gas.

Looking at putting in an off-road x in the spring to run 110 gas. I am thinking of swapping out the lower to add hp/tq.

what recommendations are out there for a lower swap? What kind of hp/tq numbers would you estimate with these two mods? My thought would be to add a 50-shot after this......

thanks!

 

[CobraChris08]

I'm running a 6lb lower. See sig.

 

[Sl0w7pt3]

i have 3"upper stock lower made 22psi on 100oct (607,586tq) thinking of also adding a 50 shot dont know if its safe on stock motor......

 

[HISSMAN]

I would have thought your guys numbers would be better than that. especially with 22 psi on 100 octane. I am doing 612hp,574tq @ 17 psi on 93 octane/19 degrees of timing and 628hp,598tq @ 17 psi on 96 octane/21 degrees of timing.

-Jeff

 

[BlckBox04]

im running 2 3/4? i think...whatever makes 18lbs with the stock lower and i made just 600rwhp/560rwtq

 

[HISSMAN]

im running 2 3/4? i think...whatever makes 18lbs with the stock lower and i made just 600rwhp/560rwtq

That seems more like it to me.

 

[Rick James]

I would have thought your guys numbers would be better than that. especially with 22 psi on 100 octane. I am doing 612hp,574tq @ 17 psi on 93 octane/19 degrees of timing and 628hp,598tq @ 17 psi on 96 octane/21 degrees of timing.

-Jeff

+1. Looks like the smaller PD's are still making better #'s at <22lbs of boost on stock motors.

 

[hpbyhermann]

Leave the stock lower on it.

You can make PLENTY of power just using an upper plus you have the advantage of still having a functional front main bearing support system. :rockon: Hermann

 

[HISSMAN]

You can make PLENTY of power just using an upper plus you have the advantage of still having a functional front main bearing support system. :rockon: Hermann

Couldn't agree more.

 

[IACobra]

I would have thought your guys numbers would be better than that. especially with 22 psi on 100 octane. I am doing 612hp,574tq @ 17 psi on 93 octane/19 degrees of timing and 628hp,598tq @ 17 psi on 96 octane/21 degrees of timing.

-Jeff

Jeff, i'm learning quickly about this stuff, but i am assuming my numbers are a bit lower due to running stock headers and h-pipe, plus a 16 degree tune. Tuner (Bob Kurgan) thought that 630 would easily be attained with these tweaks- sound right to you?

thanks, Steve

 

[CobraRyan]

3" upper 4lb lower ftw!!! Get an o/r midpipe and some lt's

 

[03cobramanIII]

im running 2 3/4? i think...whatever makes 18lbs with the stock lower and i made just 600rwhp/560rwtq

that set up should have made 23/24 psi boost > 2.75 upper?

 

[BLOOWN03]

110 gas?? Leaded?? or unleaded?? If unleaded send some to VA!!:beer: