got trans back

[Michael Yount]

God - I hope you're not trusting MY advice - as Scotty on Star Trek would say "Cap'n, I'm givin' 'er all I got and she's gonna blow!"

On the stall - it's not so much that they need power to make them work - it's the rpm the power occurs at. Typically, small displacement naturally aspirated motors that are built to really run and rev - make a pretty small amount of torque down low in the rpm range. Some people would say 'it wouldn't get out of it's own way below 3000 rpm' - because it made great power high, but no power down low. Those are what the high stall converters help -- they allow slip up to that rpm range where the engine begins to make power. If yours comes out the way you want it to, I don't think you're gonna have that much of an issue with power down low. That's why I and others were suggesting a lower rpm stall -- cause you'll have a bit more power down low than a 4000 rpm stall was designed for.

What did your combo end up being by the way? What kind of heads/intake/exhaust/cam/supercharger/compression ratio?

 

[shttygtstang]

my power band is suppose to be from38 to 6600 i have mane coponets that make this are the sc and victor intake f303 cam ported heads 8.5 comp 75mm tb steda fuel rails adj fuel reg full msd set up

 

[shttygtstang]

ill give you the whole set up 80mm maf 36lbs injectors accufab 75mm tb victor intake manifold 255lbh pump stedda fuel rail adj fuel reg stock f303 cam ported heads(im looking for new heads now but im gunna by a block and build it up) cosmetic head gasket 65 thousandth over 8.5 comp paxton sc set at 13.5 psi turbo xs bov x pipe flow masters 40 seriers double roller adjustible timing gear msd 6al msd blaster 2 coil msd distributor arp head bolt fasteners electric fan (i have a nx kit im not shure im gunna use it though) im shure im missing some stuff

 

[Michael Yount]

Is it intercooled? Stock heads? Who ported them? Do you have flow numbers?

 

[shttygtstang]

yeah me and my air tools im starting them tommorow

 

[shttygtstang]

im looking for an intercooler now

 

[shttygtstang]

wut do you think ill make 500 at the fly wheel

 

[Michael Yount]

Absolutely no way of knowing what kind of power it's gonna make. What kind of shape is the bottom end in? Is it new? If not, did you run compression and/or leak down tests before you took it apart?

The weak link in your set up is your stock heads - big restriction there. You've all these big flowing parts up and down stream - and the stock heads clogging things up in the middle. No doubt porting them helps, but they are a limitation. You mention a lower compression ratio - I assume you're still going with the thicker head gasket for that. That remains my biggest concern. You'll have no quench, and with iron heads and no intercooler, I think detonation is gonna be a problem. And detonation under boost can get pretty ugly. Are you running studs or bolts for the heads?

 

[shttygtstang]

studs

 

[shttygtstang]

ok ive been thinking about the hole head thing inm going to the junkyard and gunna get some gt40p heads off an explorer..will they bolt right up i know i need new header but will everthing else work ..head gasket lifters i just bought new valve springs with a 550 lift from jegs for my cam..tell me wut would i need

 

[Michael Yount]

Everything else should work - except your emissions stuff - no crossover tube ports for the air injection. However, you probably need to make another post and ask about resulting compression ratios with the P's. I believe the combustion chamber size on the P is a little smaller than the E7's resulting in higher compression ratio - not the direction you need to go with boost. And they are also cast iron heads - with no intercooler, higher compression and cast iron heads - even if you get the quench right, detonation potential appears again. An aluminum head with a larger chamber would lower your compression ratio, keep the chamber cooler and with a standard thickness head gasket would give you good quench -- which all helps reduce detonation.

What about the bottom end? Have you run compression checks? If it's weak, and you boost it - well, you know the answer.

 

[ratrapp]

do you really think your going to make over 500 hp?i think around 400-450 would be more realistic.not trying to rain on your parade or nothing but 500 550 is a serious amont of power without aftermarket heads,even would be very tough with gt-40p heads.

 

[shttygtstang]

ratrapp on the edelbrock sit look at some dyno # there intake one step below makes 400 matched witha cam there heads and tb now of course im gunna port these heads and im also talking hp to the fly wheel

 

[ratrapp]

on there dyno sheet it shows 337 hp with a rpm intake,aluminum heads,70mmtb and 1 3/4 headers.you get 415 with a 347 with rpmll intake,victor heads,70mm tb and 1 3/4 headers.sorry but gt-40p heads even ported will fall short of rpm or victor heads.and keep in mind there engines are usually dynoed with no engine accesories to get the hp #S up also.granted a s/c will help alot but the heads are really going to hold you back.not trying to argue and hope you have good luck with your project.

 

[Michael Yount]

No sense talking flywheel HP cause you're not gonna measure it there - I assume you'll take it to a chassis dyno. Most folks on here will assume rwhp numbers as that's how almost all are measured, and taking it back to the flywheel from the tires is a wild-assed guess anyhow. Even trying to get comparable numbers from car to car on the same dyno, between cars on different dynos and from the same car at different times on the same dyno is next to impossible. Variables like intake air temp, tire pressure, tire balance, and the tension in the tie down straps can cause variations of as much as 15-30 HP. So don't get too excited about the accuracy of your dyno numbers whatever they turn out to be. I said before, I have no idea what it will make. But the vast majority of the 450-500 rwhp boosted combos I've seen have good flowing aluminum aftermarket heads on them, and they're intercooled.

 

[Michael Yount]

So, to put ratrapp's numbers in perspective, the 337hp 302 would be doin' good to put down 270 at the wheels; the 415HP 347 would be doin' good to put down 320 at the wheels. Even with decent boost shttygt you begin to see just what a steep hill building even a 400 rwhp motor is. There are plenty of them out there - but they have proven combos of parts that work well together, and they usually spend some $ getting there.

 

[ratrapp]

that's all i was trying to get across.we have too many imports at our local d/s that claim between 300 and 450 hp.but let's be realistic about this,yes there are motors out there that make sick hp#s like that but how many thousands of dollars do they cost?your not going to do that unless you have something like a ls1 or ls6 camaro.my 396 dynos at like 465hp and it cost me alot of money and it has merlin oval port heads.like i said before the heads are going to hold you back,no offense.

 

[Michael Yount]

ratrapp - I believe that this is shttygtstang's first V-8 powered Stang -- he's coming out of one of those higher HP imports I believe.

 

[ratrapp]

i wasn't trying to down imports,to each his own.we actually have one fast honda at our track.it run's 7.70s,but i don't know what motor he has.but it does take a bottle and turbo to do it so i don't know much he has in it money wise.it's really hard to make that much hp on a street driven car,but the benchracing dynos usually add atleast 100hp.

 

[Michael Yount]

Didn't think you were -- just providing context. I personally think the whole notion of import vs. domestic is just a bunch of arbitrary hogwash. They build a car in the states - that makes it an "import" in Canada. Funny. All of the majors are so global now that there really is no import or domestic any longer. They may be assembled in one country - but so many suppliers produce components that it's almost impossible to know for sure exactly where all the bits and pieces come from. In any event, if Ford and GM don't figure out how to build small (Civic/Corolla) cars and mid-size sedans (Camry/Accord) that people in the states want to buy in significant quantities, they too are gonna have to merge or be acquired before all is said and done. I suspect it will be with each other -- as I believe they have too much pride to do a deal with an 'import' manufacturer. Too bad I think - as other manufacturers have done a much better job figuring out what the general public wants. In cars, they've consistently lost market share for the last 25 years, and in many segments, their market is literally 'dieing' out from under them. About the only area they've (Ford/GM) managed to hang onto is trucks - and even in that area the domination is waning. It will only get more competitive as Honda enters the market as Toyota and Nissan have. The writing's on the wall.....once the last 2 hook up with someone else, we can finally lose the terms 'domestic' and 'imported' once and for all. Enough rant.

It's the 600-800HP stock bottom-end Supras that amaze me....