[Jokerz]

Karch your blower and my blower has netted great gains. Raising boost with efficiency is not a bad thing.

Heads are about equal to a blower as far as gains but lower boost.

To me both go hand and hand to one another.


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[Karch]

Thanks Brett.

I was trying to answer the question based on what I see as what I think it a better overall increase in power.

The worst part on the heads thing is the labor...it's a fair amount of work.

On 91 cali fuel, I gained about 100 hp adding a cam and ported LSA castings, and reduced boost some, probably about a psi.

I think the heads are probably about 40 of that hp, and had I gone with a bigger cam, it probably would approach 50.

No question the blower porting increases power, but it also increases the heat. If the guy has the means, heads and blower, and cam.

IMO, if you have pulleys and CAI only, would do E85 if available, only going 50% ethanol, but be sure you watch it, and then go with a cam. The stock LSA cam is so small. Even going to an LS9 cam is worth 35hp and virtually zero drawback except needing springs and a tune, plus the labor. The car is really undercammed from the factory.

That's my honest 2 cents, completely taking away any consideration towards making a penny...it's just where the gains are.

Blower porting, heads, cam, all that stuff is what you do to reliably go from 600 up to around 800, rwhp, stock bottom end.

 

[subaru335i]

Thanks Brett.

I was trying to answer the question based on what I see as what I think it a better overall increase in power.

The worst part on the heads thing is the labor...it's a fair amount of work.

On 91 cali fuel, I gained about 100 hp adding a cam and ported LSA castings, and reduced boost some, probably about a psi.

I think the heads are probably about 40 of that hp, and had I gone with a bigger cam, it probably would approach 50.

No question the blower porting increases power, but it also increases the heat. If the guy has the means, heads and blower, and cam.

IMO, if you have pulleys and CAI only, would do E85 if available, only going 50% ethanol, but be sure you watch it, and then go with a cam. The stock LSA cam is so small. Even going to an LS9 cam is worth 35hp and virtually zero drawback except needing springs and a tune, plus the labor. The car is really undercammed from the factory.

That's my honest 2 cents, completely taking away any consideration towards making a penny...it's just where the gains are.

Blower porting, heads, cam, all that stuff is what you do to reliably go from 600 up to around 800, rwhp, stock bottom end.

Does the LS9 cam require swapping springs every 30k miles like all the bigger aftermarket ones?

 

[Karch]

Does the LS9 cam require swapping springs every 30k miles like all the bigger aftermarket ones?

I think you can run beehive springs that don't require replacing often. The LS9 cam is about 0.55x" lift, and the ramps aren't as severe.

I think @jb_bgg has a lot of Street and racing miles on his.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[bmylez]

No question the blower porting increases power, but it also increases the heat. If the guy has the means, heads and blower, and cam.

I've never heard of porting increasing heat? Is it only when the heads aren't ported as well?

 

[Blown376]

I've never heard of porting increasing heat? Is it only when the heads aren't ported as well?

Yes, that would be the scenario. More airflow/volume from the more efficient blower entering the cylinder, but then being choked by the less efficient head. That would increase your psi, but more because of the restrictions after the rotors.

 

[bmylez]

Hrrmm, I was originally planning on porting the blower and snout along with upper/lower if the power bug really bit me, but didn't want to deal with pulling heads or messing with the cam as I want to keep things simple. Sounds like it would be counterproductive and I should just do pulleys (maybe ported snout) since the last thing I want is more heat in Texas.

 

[Karch]

Blower porting adds heat because you are getting more air into the blower, which results in an increase in boost, which results in more heat.

It's more efficient, but still increases the heat as you can't get around physics.

You will still increase power.

The blower will be more efficient than one not ported, so it's still a worthy upgrade.

I just feel the need to point it out as I'm an engineer, and I personally would want to know all aspects.



CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[bmylez]

The thing is, I don't drag the car and am planning on doing more road course events. I need longterm reliability and heat would cause more problems than the power would be worth.

 

[Karch]

Road racing...ported heads, ported blower (if you want another 30 hp and more torque coming out of the corners), stock pulleys to keep the heat in check, and a properly spec'd cam.

That would cover the engine portion, though not the cheapest option.

You don't want excessive heat, as road racing will cause you a lot of problems with a lot of pulley.

Also, diff cooler, suspension upgrades, and of course tires and brakes.

Plus oil cooler.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[bmylez]

Road racing...ported heads, ported blower (if you want another 30 hp and more torque coming out of the corners), stock pulleys to keep the heat in check, and a properly spec'd cam.

That would cover the engine portion, though not the cheapest option.

You don't want excessive heat, as road racing will cause you a lot of problems with a lot of pulley.

Also, diff cooler, suspension upgrades, and of course tires and brakes.

Plus oil cooler.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

I think you missed the part where I said I'm not pulling the heads or the cam, haha. Sounds like I won't be going with 2.45/8.66, though.

 

[Karch]

Fair enough. I would focus on the other aspects, like suspension, tires, diff cooler, etc.

 

[bmylez]

Fair enough. I would focus on the other aspects, like suspension, tires, diff cooler, etc.

Already have forged wheels, Conti Extreme Sport tires, and I'm working on a custom suspension setup, which I will do a write-up on if it works. Cooling will come before more power. I wouldn't think just running an 8.66 lower should be a problem, though? I need to do my oil pan gasket at some point, and if I'm down there anyway, I was thinking of upgraded oil pan baffle and ported oil pump. Would be a great time to do the lower.

 

[Karch]

You should see a nice gain with just the lower, and still manageable with the heat.

There are a few road racers here that would be able to share their experiences.

Out here in SoCal, it's brutally hot at the road race courses for a good portion of the season.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[bmylez]

Maybe 2.75/8.66 with ported snout? As far as I can tell, my s/c is untouched, which means it's on stock isolator. I just hate doing all the work to remove the snout without upgrading *something* hah.

 

[Karch]

Porting the snout does little, really.

 

[bmylez]

But as for boost, 2.75/8.66 paired with HX tank and pump should be more than reasonable.

 

[Karch]

Why not run stock upper with a 9.1 lower then?

Save the money and labor.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

 

[bmylez]

Why not run stock upper with a 9.1 lower then?

Save the money and labor.


CNC ported blowers, heads from WCCH, new Eaton rotor packs for your LSA blower, Mamo ported throttle bodies and more:
Sales@dynamicflowconcepts.net
Dynamicflowconcepts.net

I got one of those super cheap Powerbond 8.66 lowers, so it's still cheaper to get an upper than getting just an ATI lower.

 

[Karch]

I got one of those super cheap Powerbond 8.66 lowers, so it's still cheaper to get an upper than getting just an ATI lower.

OK, I give up. Best of luck.