Throttle Body. Is it worth $350? Is it true that you can get 7 HP gain from doing this mod?
Chaseman:burnout:
What mod is that? I haven't seen anyone offering a larger throttle body for the Cayman. I suppose it is possible if you get more air into the engine and the injectors can match accordingly you should get some more power. No one has done this on the Cayman that I know of and no dyno results.
Well, to be honest I had just learned about this mod at the shop installing my AWE/GIAC and Evom Air intake. I was told with the combo of the Evom they can bored it out and makes the throttle wider it will generate more airflow into the engine. Supposedly, many 997 Turbo guys are doing this mod, and he claimed that you can get 7 more hp at the crank.
I was just checking to see if anyone here have done or heard of this mod before. Well, evidently it is something new for our Cayman. I will check it out for an additional $300. The only bad thing is this will be done at the same time as the air intake being installed so I won’t be able to dyno it separately to see the real gain on the hp. Anyway, I would love to hear some of your opinion and advice.
Ciao,
Chaseman
:burnout:
I dunno, I guess I'd like to know what the bore is on our throttle body currently, what it is on say a 997 C2S, a GT3 and a Turbo to compare.
If the throttle body is the smallest restriction in the intake then making it larger will help. Remember that you can only flow what the smallest restriction will let you. In a turbo things change as you can force more air through a restriction. Will you get more power, only a back to back dyno run will tell you.
Good question. I will check it out.
Chaseman:burnout:
Hmmmmmm... $50/hp - kinda steep, imho.
brad
Here is the answer from SG.
"NO IDLE PROB...WE GO UP BY 4MM AND GRIND DOWN THE ROD. FLOWS MUCH
BETTER."
Sam Ahdoot
The Speed Gallery
Chaseman
Really! I thought it was pretty cheap for $50/HP. The only thing that I concern with is the idling and if their claim is true.
Chaseman
Agreed. $50 per HP is a steal.
I'm not buying it. So many companies want you to believe their wild claims of hp gains, and if we could add all of those gains together we could have a 500hp Cayman in no time. But the truth is, these mods are usually not easily quantified in real testing.
I'll never forget Marc Gelefsky. Back when I had my '86 944 Turbo I worked with a guy who had an '87 that he did every mod available on. Hot wire mass flow sensor, bigger Turbo, Cup Car Exhaust, cold air intake, no cats, chipped, etc.... He used to tell me how he was pushing 350hp and how my nearly stock car wouldn't stand a chance against his. He was very arrogant. Well, one day we met up on the Jersey Turnpike, and I'll be damned if he didn't want to prove his superiority to me. Only it backfired on him. I absolutely wrecked him all 3 times accelerating from about 50 mph when traffic opened up. It was absolutley hillarious.
That sums it up so well,certainly there are mods that can make a difference,a larger turbo seems like one that would make a huge difference,but often time claims are exagerrated and the numbers people quote are from their "butt Dyno" as opposed to the real deal. Kman has done a good job of documenting the improvements different mods give.I would love to side by side him to see what the real world is between a completely stock and nicely modded car is.
fafnir,
They don't have a website but you can Google it on the web. I am still debating whether or not if I should be a guinea pig and do it, and for $350 is still relatively cheap for this type of car. Here is what I retrieved from "http://en.wikipedia.org/wiki/Throttle_body"
In a fuel injection engine, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver input. While the accelerator is often called a "gas pedal", it would be more accurate to describe it as an "air pedal".
The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor.
The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow.
On many cars, the accelerator pedal motion is communicated through the throttle cable, which activates the throttle linkages, which moves the throttle plate. In cars with electronic throttle control (also known as "drive-by-wire"), an electric motor controls the throttle linkages and the accelerator cable connects not to the throttle body but to a sensor. The Engine Control Unit (ECU) determines the throttle opening.
When the driver presses on the accelerator pedal, the throttle plate opens up, allowing more air into the intake manifold. Either a throttle position sensor or an airflow sensor measures this change and communicates with the ECU. The ECU then increases the amount of fuel being sent to the fuel injectors in order to maintain the desired air-fuel ratio.
Throttle bodies may also contain valves and adjustments to control the minimum airflow during idle. Even in those units that are not "drive-by-wire" there may be a small electric motor that the ECU uses to modify the throttle opening.
Many cars have a single throttle body, however more than one may be used, chained together by linkages, to improve throttle response. At the extreme end, cars such as the BMW M1 have a separate throttle body for each cylinder.
A throttle body is somewhat analogous to the carburetor in a non-injected engine. Carburetors combine the functionality of the throttle body and the fuel injectors into one, that is, to modulate the amount of air flow, and to combine air and gas together. Cars with throttle body injection (called TBI by General Motors and CFI by Ford) locate the fuel injectors in the throttle body, thereby allowing an older engine to be converted from carburetor to fuel injection without altering significantly the engine design.
Chaseman:burnout: :burnout:
uhoh...did someone say wikipedia?....
I may be the only one that got that RR!
haha...i figured someone would remember. sorry chaseman...not trying to hijack the thread.
