Michael_Rudy

Well i have a set of MFR 12a peripheral port housings that are awaiting a project of mine down the road, but mean while my dad has asked if he can use them to build an engine for his Drag car. So what he is wondering is, running between 15-17 psi (he wants to stay on pump gas) how much power could he make? He will be running a draw through system with a predator carb. He is also wondering if the 6,000 Stall converter he has will be enough for the car not to bog of the launch.

GUITARJUNKIE28

15-17 psi in a pp isn't even the same ballpark as 15-17psi on a streetport or somethng like that. tho motor's powerband is going to be much higher and he won't be able to run as much boost.

there's no real way to answer "is this safe". he's going to have to spend some time on the dyno and watch things very carefully and find the limitations of pump gas with that setup.

turbo size will play a HUGE factor in it as well.

Michael_Rudy

I can understand that as the PP will flow alot more air, is there anyone running a fairly low boost PP, all the ones i have seen are running 25-30+ psi

13btnos

iTrader: (1)

Not a 12A but a 13BPP turbo http://ausrotary.dntinternet.com/for...=77936&start=0 Car made "420HP at the tyres, slipping clutch and at only 7300rpm and 9psi boost!" This was done on pump gas.

enzo250

PP Turbo's are alot of fun. Yes they scare most people but that's because not many people have done them and the ones that have aren't to keen about sharing the info they have.

As for running low boost on pump gas i don't see any problems with it. The one thing i would stress though would be proper wastegate placement and size. PP's will boost like crazy and trying to get them to run low boost will need a good manifold!
We have a car that will make over 35psi just free revving and on a 2 step will easily exceed 50psi within the second bang.

GUITARJUNKIE28

420 is a waste of a pp. but since that's an aussie website, maybe that number was KW.

420kw= 563hp
that sounds a bit more like it.

enzo250

How is that a waste? What the hell are you talking about?
You obviously dont' have a clue about pp turbo motors...

It was probably dynoed on a dyno dynamics which is about 13~15% lower then dynojet.

shm21284

The 12a will require LOTS of work to make any sort of numbers, say, above 300. You will need dowell pinning, race oil pump, turbo2 water pump, 110 psi oil pressure regulator, and some other good stuff (not that 13b's dont need some of these, but 12a's require lots more work). Also, you WILL be able to produce 17psi of boost on a PP, just that a PP will show more accurately the boost actually going inside the engine, as opposed to a street port, which is manifold boost (the port acts like a pressure nozzle).

GUITARJUNKIE28

what i'm saying is you can get that kind of hp in a boosted application on stock ports. the peripheral is going to move the powerband up. the slower you can spin it for any particular hp level (generally speaking) the longet it will last.

enzo250

I'd love to see you make 420hp on a dyno dynamics dyno with 9lbs of boost on stock ports and gasoline. I'd actually pay to see this because you wouldn't even come close...

GUITARJUNKIE28

you missed the point.

13btnos

iTrader: (1)

This was done on a DynoDynamics and it is RWHP not KW it's not a waste of a PPort when you consider that this was done on pump gas and making 420rwhp at 7300rpm's. Pretty impressive if you think about it and this a street/strip car that they will be running on C16 and turning up the boost. Imagine the power they will be making at say 30psi boost. I understand what you mean by a waste but you have to put in consideration that this motor has not been pushed even close to it's limits yet. 420rwhp@9psi on pump gas and running only 7300rpm's I would love to have that in a daily driver.

enzo250

What point?
Tell me what power wouldn't be a waste with 9lbs of boost.

MARTIN

420 at 9lbs of boost??? how is it a waste? are you crazy.... I would love for you to get that power from a stock ported 13b.

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iTrader: (1)

I believe his point was that you can make 420rwhp with a stock port motor, which can be done, but with alot more boost than 9psi. What he fails to see is that this was done with only 9psi boost a stock port at 9psi will not even come close to this number. No way in hell! Another thing is he doesn't realize that this was a first time tune and was done on pump gas they are going to run C16 and turn the boost up on this motor. I am closely watching this thread on AusRotary it's very exciting to see people are successful with a PPort turbo setup. Also enzo250 if you were to consider a low boost say 20psi max on a PPort turbo what kind of wastegate setup would be ideal? A single large or 2 individuals per runner? I love the manifolds that you have built they are top shelf.

Michael_Rudy

well he is still intrested in dueing it and after he saw that 420 rwhp at such a low rpm at 9 psi, he is really excited now. The gas he would be using he told me is a mix of pump 93 and some sort of race gas with a 116 octane level. So you guys are talking about intakes being extremely important, would we want to go with a sort intake or a longer intake, keep in mind that this is a draw through turbo set up.

GUITARJUNKIE28

na, i didn't fail to see any point. a pp is just overkill for 400hp.

assuming 2 engines made the same hp, i'd rather see 400whp @ 6500 rpm @15 psi than 400whp @ 8500 rpm @ 9psi.

MARTIN

First of all, I would agree with you if he only wanted 400hp. With a pp/turbo setup, your are definately gunna want more than 9lbs of boost and 400hp.

Michael_Rudy

well eventually it will happen that he will run more boost, but hey its better to use the housings then have them sitting around doing nothing

enzo250

Thanks... If you build the proper manifold you could use one single wastegate and that would work fine. Although finding someone to do it properly is the tough part. You would be better off using twin gates one per runner. Easier to build and buying a single large gate is expensive. I would use 2 - 44mm tial vbands.

enzo250

Until you actually build some and experience it for yourself don't make comments you can't back up. that motor made 420hp on a dd dyno which is equal to about 485hp on a dynojet and this was at 7300rpms. You guys read all this bullshit about pp motors you automatically think you have to rev the **** out of it to make power. You keep reading buddy.

GUITARJUNKIE28

you totally missed the point.
he said pump gas. where i live that's 91 octane. it might be higher where he is, but that's where i am. you'd max out the gas before you maxed out the port.

13btnos

iTrader: (1)

Yes he said pump gas but look on that PPort 13b it made 420rwhp @ 7300rpms not at 8500rpms. And it is safe to say that you can run up to 20psi boost on pump gas there are many of those that do. I would like to see a comparison of a side port to a PPort @ 20psi I guarantee the results would be dramatic and as you can tell already you don't have to rev a PPort to the moon to make great power 420rwhp @ 7300rpm's you are not even coming close to putting a strain on that engine.

enzo250

Yeah but your missing the point.....lol...

13btnos

iTrader: (1)

LOL. I'll take that one bro and I won't respond to this thread anymore. Later...