Maggie vs ecs 1500

[ColoradoSS]

So ive read through what seems like hundreds of post about people wanting To know what's better PD or centri. I understand the PD blower will give you more seat of your pants grunt and the centris are the hp number kings. I don't really have any HP goals or any interest in the 1/4 mile. I just like going fast. So my question is, is there a certain mph where the PD blower falls on its face? I would think that the centri would really outshine the PD at 100+ mph. One last thing, I like to make small road trips in my car 2-3 hours of highway time on average. I would think that since the PD make peak boost so low you'd constantly be putting high boost into the engine even just cruising down the highway. Is this correct? And what kind of cruising psi numbers do people see out of the centris?
Thanks for the help guys! - Jake

[Bo White]

Your only under boost once the vacuum drops to a given point meaning hard acceleration.

[Nitroman28]

PD blower will make no boost at cruising speeds. You have to go 50% or higher with the throttle to get into boost. I got 21mpg on the highway with a Maggie. My maggie would pull to 155 no problem at 10psi. Cant beat a PD blower for a daily driver. Centri has to build boost.

[Bo White]

Centri is RPM dependent meaning the more RPM under load the more boost it will build.

[SuperchargedStealth]

Both are great as far as enduring long trips. Elevation and air density will affect performance. Especially humidity. PD blowers are subject more to heat soak. While cruising though, you're not really in boost with a centri until you hit about 2500RPM, so if you're cruising at 70, you're not gonna see a difference in MPG as compared to running N/A. PD blowers are absolutely great for making power down low. No matter where you are in the powerband, once you hit the gas, you will take off. The downside is that once you hit peak boost, that's it. You're not going to accelerate any faster. Centri's can do the same, but you need to be at a much higher RPM level, and as long as you stay within boost when shifting, you'll continue to build boost. Don't expect to take off at a low RPM. Take this into consideration though, as much as I am an advocate of centri blowers, looking at your location, you may want to look into a turbo kit. You'll have a little lag, but environmental factors won't affect turbos as much as they do with S/C. As example, I was tuned at 20 psi at sea level. When I went racing and datalogged, I lost 3 lbs. because I was at a higher elevation where the air is thinner. Blowers like denser air. Turbos don't care because it builds boost off of the exhaust. To compensate for the boost loss, I dropped a pulley size and gained the lost boost back at a higher elevation.

[Bo White]

Correct. Like mine only has 2-3psi of boost at 2500

[Unreal]

At elevation, I think it is silly to do anything but turbos. The fact that they can pretty much make up for the elevation alone is worth doing, plus for your needs, turbos would work perfect.

[Andy-AMSOIL]

PD alll the way. I dont like to rev high which centri needs

[ColoradoSS]

Thanks for all the responses so far! I do reside in Kansas now at about 1100ft so elevation isn't much of a concern sorry that misleading info. One thing I prefer of the turbo or centri is the ability to expand in the future. I don't know if I'll get bored with the 600hp range. With a turbo kit at what psi or HP will I need to put forged internals and lower compression pistons?

[ColoradoSS]

Also as far as turbos go anyone know any top mount kits that are of quality? If heard and read horror stories about the fastlane single turbo kit on this site. If I went turbo I'd want a top mount. Spending 6k plus on the kit I'd at least like to see it under the hood! And honestly the idea of the turbos under the car concerns me a bit as far as wear and tear

[old motorhead]

Originally Posted by SuperchargedStealth

PD blowers are absolutely great for making power down low. No matter where you are in the powerband, once you hit the gas, you will take off. The downside is that once you hit peak boost, that's it. You're not going to accelerate any faster.

I disagree with this part of your post just a little. Just because the boost isn't going up doesn't mean the power isn't going up. A TVS typically has a pretty flat boost curve. Boost level will vary very little from 2500 rpm on up. Unless the rig is very poorly put together, the power is going to peak near redline. Boost doesn't go up as RPM rises, but power does. Boost doesn't move your Camaro.

[AGP Turbo]

Originally Posted by old motorhead

I disagree with this part of your post just a little. Just because the boost isn't going up doesn't mean the power isn't going up. A TVS typically has a pretty flat boost curve. Boost level will vary very little from 2500 rpm on up. Unless the rig is very poorly put together, the power is going to peak near redline. Boost doesn't go up as RPM rises, but power does. Boost doesn't move your Camaro.

Right. Your car accelerates the fastest at peak HP. And even PD blower cars that make tons of bottom end TQ, still gain and make peak HP up high RPM. And you still shift a PD blower car at high RPM to get the maximum thrust out of it to make it go faster. So they do get faster at high RPM, just not as fast as something making more HP like a centri or turbo.

[ABMLS3]

6 hour car ride with a built motor and twin turbos and I got 25mpg

[Bo White]

Dyno day today. Stock LS3 drive train with full OBX exhaust.