Re: PowerWorks SVT supercharger
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We already know that 290whp is possible on 91 octane gas/9psi of boost with the Vortech kit. I would guess low 300's is possible on 93 octane. That is considerably more then the new GT or old Mach 1 puts down stock.
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Have you ever seen a stock Mach 1 dyno? They put down around 280 stock with the paper filter and are right at 300 rwhp with just exhaust and pulleys (about $600). The new GT will put down 260 stock. I would not call that considerably less than 290 (which is not the norm with that kit either). If you factor in the weight difference, I would agree with you that a 290 whp svtf would be a handful on a road course but would still get outgunned in the straights and play catch up in the twisties. Then again, most people don't autox or road race, they go from light to light on the street. Plus, you are not putting any pressure on the engine internals with a stock Mach or GT like you are with a 9psi svtf. With a CR over 10:1, it is just a matter of time before the stock internals make the engine go boom, no matter how safe the tune. If you go with all forged internals on your svtf, the cost of the blower just went up around $1k or more if you need a shop to do it for you. Look at the 96-98 Cobras with blowers and stock internals to see how well a Ford DOHC with 10:1 CR fares when blown more than 6 psi...
I am not knocking the svtf at all, I love mine, I just don't see the point in dropping $5k into a car that depreciates faster than most others. The car is fun to drive the way it is. I would save the money and let it earn interest until I was at a place to use it with my trade for a down payment on something better that takes to mods better.
Modding it up like that also makes it much harder to sell unless you want to return the car to stock and lie to the buyer about it being blown at one point in time.
The bottom line is that it is your car, so you can do what you want with it. It really doesn't matter what other people like me think. If it makes you happy, go for it. By the same token, I am entitled to my opinion which I tried to explain above. We are all friends here and friends disagree from time to time. No biggie, I won't clutter up this thread anymore...
Yes I know a Mach 1 can put ~280whp down, but I was talking about a tuning up the SVTF for 93 octane, which would probably net low 300whp. 20hp is a notable difference IMHO. I have to disagree with you when you say the SVTF would still be outgunned. I give the nod to the stangs on launches, but from a roll I think the SVTF would still be ahead. 400lbs is like having another ~30-40hp deficit on top of the 20hp it's already down.
Boosting anything can be safe, and you'll probably get 80-90 percent of the same engine life if you keep the tune safe. So lets say the focus can only get to 100k miles (I think much much more but lets be conservative), so now your only going to get 80-90k miles before a rebuild...hmm..by then I would have probably wanted to rebuild it anyway to allow for more boost/power
What kills an engine is detonation, that is pretty much the sum of the situation. Running lean=hot=detonation, running too low of octane gas=detonation, running too much boost for your octane=detonation. Detonation events can cause forces on the engine internals up to and over %1000 higher then a normal compression stroke. Even minor detonation can cause %100 more pressure, and you can't always hear detonation, that is why people blow cars up they have boosted. They tune for the ragged edge of safety to try to get those peak numbers to brag about, and then end up detonating and bam the engine goes. I think 15psi is only like %20 more pressure on the internals in comparison. A J&S unit can help keep this from happening also (which is big part of why the Vortech kit has hit 290whp safely on 91 octane/9psi), which would be a standard mod I would put on a FI install.
Also, the amount of boost you can add to a car is dependent on a lot of things. For one, the head material, aluminum dissipates heat better then iron, therefore detonation is a little less likely with aluminum because heat allows for detonation. Another thing is the type/size and "cleanliness" of the combustion chamber. Some chambers are more conducive to boost then others, and a clean chamber is less likely to have burrs which can become hot spots (similar to a glow plug). And also cam timing plays a large role in the amount of boost; it can hold or let off pressure. If you think 9psi on 10.2:1 is a lot, talk to the Corvette guys with 11:1 compression and 7psi
You see, the focus does depreciate fast, and that's another reason to stick with it. You've already lost some money; trading or selling early will not help you with that. Might as well keep it for a while, and might as well be happy with it if your going to keep it right? 170hp is not enough for me to remain happy, but I love the other aspects of the car it just lacks power, so for me the obvious solution is to boost it.
And the SVTF does take to mods well, well it takes to FI really well. I think in Sport compact they said the SRT-4 has like 15-20psi of back pressure built into it, if you add 9psi of boost to the SVTF its backpressure is only like 4psi, which they said is comparable to a free flowing NA engine. What else can you really do to an SVTF to boost hp by so much for $5k? Even the all out higher RPM NA combo's are only making 220ish whp, and they would be far less driveable. Sure I could a UDP, intake, high-flow cat, cam gears, and tune....but that's like over $1k for ~15whp before shipping costs, compared to 120+whp for ~$5k (powerworks estimate).
It doesn't matter to me if we disagree; I just wanted to make sure you saw both sides of the situation. You still have to look at the other factors outside of performance also, like insurance rates, gas mileage (if its going to be a DD), and ability to get around when the weather goes bad (not saying a Mustang can’t, I drove a fox body through a blizzard once with the right tires and it did ok, but I had to have those tires.) So for me, the SVTF is a good little car, but with boost it would be a very fun car to drive day to day. In fact I will probably try to keep the SVTF around even if I were to go with a Mustang or some other car in the future!