Why Doesn't Any Company Make A Header For The 5SFE Options

[CyberCT]

I have been browsing this forum for quite some time and have noticed that NO COMPANY make a header for the 2.2l 5sfe. SSAutochrome was about to but then people backed out (and yes, I have seen claims of their poor quality with some products. Fortunately this header wasn't bad. There was one or two instances where they did crack or break though in the MR2 community, and that's about it).

I had three MK II MR2s with the 5sfe. I also had the SSAC header on one of them. Let me tell you the performance improvement was noticable right away. It was almost like night and day. More pull and it ran quicker through the gears.

When I had to put the stock exhaust manifold back on for inspection, the car ran much slower, easily noticable.

Now, the NA MR2 weighs in at @ 2650 lbs. The 94-99 Celica GT hardtop weighs in at @ 2450 lbs, correct? A good header would probably make it quicker in a line than the MR2, which felt good in a line.

Is there atleast a header in the works from a reputable aftermarket company?


I'm probably going to be buying a 6th gen celica in the near future as my new daily driver. Is there any place where I can see the yearly updates they did to the celica to fix problems from the previous year? Like for example, in 93, the MR2 fixed some electrical problems or quirks, and upgraded the suspension and other things. Is there a list like this for the 6th gen celicas?

[darksecret]

Not all cars are Hondas, the Celica tops out way before it's redline (I shift at 5,000 rpm) with ok numbers, having a lower rpm means less stress on the engine which in turn makes a better street car, an S2000 in not a street car it's a motorcycle with 4 wheels. Do you want me to explain the definition of ft.lbs., lbs. ft. and horsepower because if you think they are the same your wrong. You're thinking ft. lbs. (as in 1 hp=550ft. lbs.) which translates crankshaft force into horsepower, i'm talking lbs. ft. if we use the way you describe it my motor is making about 88,000ft. lbs. at the crank, nobody goes under the peak horsepower because when you shift you drop below the peak torque range, but if there is only a thousand rpm difference between peak horsepower and peak torque you'll want to shift at peak horsepower so that you'll be at peak torque in the next gear, lbs. ft. is the driving force making the car go faster horsepower is what helps maintain that speed and increase speed when te car is already in motion if a motor is designed to work in a 4,000 rpm range it can put the equivalent amount of power out as a car made for a 8,000 rpm range yet it only needs to reach 4,000 rpm to meet that. Large engines typically have a lower rpm range put are still capable of running high power numbers but the higher the power and lower the rpm and displacement the more engineering is involved, in the case of the S2000 there is a lot of engineering involvede yet they couldn't reach that horsepower number without increasing the rpm and a major flaw with Hondas is to reach higher horsepower numbers they must sacrifice torque, high horsepower and low torque help when you have a small light vehicle like a motorcycle, but when you are dealing with 2800lbs. cars it shows that a car with lower horsepower can overcome one with higher horsepower through means of having higher torque, the reason why Honda can have numbers like those and not have to drive at such a high rpm is through VTEC which in a way stretches the powerband out and allows the engine to take advantage of horsepower over a larger area basically flattening the horsepower curve in a sense. If you put a car that has 300hp 500lbs. ft. against a 500hp 300lbs. ft. car most likely the 500hp car will win, now if you take a 160hp 180lbs.ft. car and put it against a 180hp 120lbs.ft car then the 160hp car will most likely win (ex.gearing in that) I could go into the gearing of the Celica also but that is a whole other can of worms.

BTW if that is what you meant by horsepower being the same thing as torque you were close but they are different, if they were the same Freightliners would haul some major a**. You can't have a very high horsepower car without sacrificing torque and you can't have a very high torque vehicle without sacrificing horsepower (you can balance them also but you wont have either extreme without increasing displacement or a power adder), if you want a street beast that you can take out for more than just a weekend go for torque, if you want a track star that you can run at 8,000 rpm the entire time go for horsepower, it's more preference.

This post has been edited by darksecret: Jun 14, 2005 - 10:05 AM