Boost Please!

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11371

Boost types. We'll focus on Centri(fugal), roots, twin screw and turbo. Each will be described and the good, bad and ugly disclosed.

Boost delivery: Pick a place. Meaning pick how you want the boost to come on. Turbo's can be (but don't have to be) kinda sudden about delivering boost in the middle of the RPM band and holding steady on it to redline which can be problematic if put in the wrong car. Centrifugals develop boost very smoothly as RPM increases, roots give it all to you right away but lose the muscle up top as efficiency drops and twin screws are like roots blowers with more top end and better overall efficiency. For most people a roots or twin screw makes the most "performance" sense. Power is delivered right off the bat, holds strong and it's mega low maintenance. Twin screw is an evolved form of roots and delivers the highest output of any positive displacement (looks like a roots) blower. Higher HP numbers but lower average power come from centrifugals. Centris also spool up more like a turbo but build to peak boost steadily as RPM increases. They're a joy to tune but I hate them on the street. Most people buy them because they're inexpensive and compact. Turbos are wildly expensive to install but turn out great power when properly designed. Most systems you see on the street have too big a compressor and mighty turbo-lag. Correctly selecting your turbo will fix most of that. Turbos are HOT items. They increase underhood heat and require intercoolers for the intake charge. For most people the roots or twin screw is #1, then a centri then a turbo....simply for cost concerns.

Efficiency: This is basically the percentage of air that a blower actually moves compared to what it's trying to move. It's important to stay inside the efficient range of your compressor. Going outside that range promises to drop your average power like a used rubber and could lead to excess heat buildup and subsequent engine damage. Ever seen a massive turbo on a civic... car can make 900hp yet can't get out of its own way. Because the compressor is too big. So yeah, it can make all sorts of boost but only up really high in the RPM's and it's less fast than it was before at any RPM that's useful. Same goes with blower size... mostly

From www.mustangboards.com
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ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11371

My plan is to go ahead with procharger!! I would love to go with twin turbos but that crap is expensive and high maintence.
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ricanstang · Smokin' Tires Joined: Oct 09, 2008 Posts: 2480

arent prochargers the ones that dont have the oil line to the oil pan, if so ive heard theyre a pain in the ass when u need to change the charger oil, but i might be thinking of a different charger...
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ECUSVT31 · Posted: Tue Nov 25, 2008 11:53 pm Post subject:

yeah prochargers dont hook up to the oil pan
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blueboss · Posted: Wed Nov 26, 2008 10:38 am Post subject:

the P1 is a really nice setup, i have no complaints, boost is there when you want it just press the pedle a little harder lol. it kicks in right about 2800 rpms and when it does you better hold on haha. Chris you can check mine out whenever you want just to get an idea, ill take you for a ride in it to if you like.
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2008 Mustang GT
Procharger P1SC-1 H.O. 10 PSI, 3 Core intercooler, GT500 dual fuel pump, 44lb injectors, HT0 Spark Plugs, Diablo MAfia
RWHP 481 RWTQ 436

Infinity23 · Noob Joined: Aug 19, 2008 Posts: 91 Location: Port City

Blueboss...are you putting down 481whp on the stock internals?
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just a slow Mustang....

blueboss · Posted: Wed Nov 26, 2008 11:07 am Post subject:

yeah, i know i know, its the limit. but i had Taylor tune it, and suprisingly its a conservitave tune.
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2008 Mustang GT
Procharger P1SC-1 H.O. 10 PSI, 3 Core intercooler, GT500 dual fuel pump, 44lb injectors, HT0 Spark Plugs, Diablo MAfia
RWHP 481 RWTQ 436

TWINSCRW · Guest

HMMMM..... IDK about that! We'll have to wait and see.

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11371

Well this is going to be for the 00 gt. The 05 is going to get a single turbo set up soon. The 05 is just going to be a weekend driver with little track time. I am going to keep everything else stock just b/c I want it to be comfortable for ponygurl to drive. As for the 00 gt I am planning on a stroker kit mabe and then procharger. This car will be a track car and not to much street driving. All in good time, probably take alittle time but this is my goals.
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blueboss · Posted: Fri Nov 28, 2008 1:32 pm Post subject:

yeah i just figured there wouldn't be a huge difference between the models.
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2008 Mustang GT
Procharger P1SC-1 H.O. 10 PSI, 3 Core intercooler, GT500 dual fuel pump, 44lb injectors, HT0 Spark Plugs, Diablo MAfia
RWHP 481 RWTQ 436

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11371

Yeah there is a bit of difference. Max 2v on stock internals is about 420-430 rwhp. I have seen more but haven't heard of them lasting long. 3v around 450 ish rwhp but seen alittle more. So that 30-40 plus horse is noticeable. But you have 481 rwhp? That is like apples to oranges man! Game plan is to be at btw 475-500 rwph with built block. Careful with you car dude. At what psi are you running? And do u have more of a conservative tune for street use? Say 430 rwhp?
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TWINSCRW · Guest

well all that power should be fine until you start making it stick..... those stock tires are saving you right now

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11371

Ditto, and dont forget you rear end and trans when u do step up two a true drag. That is why I am getting all the suspension done first then rear end (31 spline).
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FastOrange · Posted: Fri Nov 28, 2008 10:41 pm Post subject:

blueboss · Posted: Sat Nov 29, 2008 1:07 pm Post subject:

Honestly i think i got a freak motor cus im only running 10 psi and taylor said he could easily squeeze over 500 with it. i told him i wanted it conservative and thats where we left it idk what to tell you guys other than unlike Dan's blower mines a centrifigul and it only makes 481 peak unlike Dans mine has to build this boost but in doing do it matches the cars Rpms .Take a look at the dyno graph i posted thats at 6200 rpm. i never see that on the street the most i ever take it up to is just over 5000 so unless i take it to the track and beat on it (Cough Dan Cough) than i really shouldnt have an issue with it. Ohh and tracktions never an issue 4 me either because i never drop or slip the clutch at red lights, just tak off casually lol. and so far i havent spun when i get into it going 50. I apreciate everyones advice though, thanks for looking out.
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2008 Mustang GT
Procharger P1SC-1 H.O. 10 PSI, 3 Core intercooler, GT500 dual fuel pump, 44lb injectors, HT0 Spark Plugs, Diablo MAfia
RWHP 481 RWTQ 436


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