does a tb bypass really give mor hp
I've done it and for $0 what more could you ask for even if you gain 1/2 a hp. It has been put on a dyno and it showed about 5rwhp and 5rwt average gains when the engine was in closed loop of course. definitely worth 20 mins
It's designed originally to heat the TB up to de-ice it for cars in climates where winter freeze and wet air could cause the TB to stick.. Doing the mod will drop air temps going thru the TB slightly ..the Cooler the air the more oxygen there is available in that air.. equalling slightly better power production at temp..
I wouldn't count on 6 hp from it but it's a good mod, and nothing beats free. Shoebox has a good writeup.
http://shbox.com/1/tb_bypass.jpg
http://shbox.com/1/tb_bypass.jpg
I don't see how that dyno result could be misconstrued. Seems pretty convincing to me. Real-world testing is a rarity these days - and Keith has been running that site (and testing) for 10 years+ now.
I'm not questioning his results, just saying it may not come out the same for every car. Even dyno runs on the same exact car can vary by a few hp. I want to get my car back to the track soon, the only thing that has been changed since the last time I ran the car is the TB bypass, I'm interested to see if it will show a measurable result.
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A 5 deg change in the weather from one day to the next will have about as much effect as this mod. Not saying it isn't a good mod, it is, but it's not large enough to be noticed at the track IMO.
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5 degree difference in temp at the track is noticeable in times............so what are you trying to say?
I was responding to the post above me from formula413. He said the only change he made from his last time at the track was the tb bypass. I was trying to point out that he is not going to see any measurable change, and if he does it could be due to better/worse weather anyway.
the more you can drop the iat, the better. running 200 degree coolant through the throttle body sure isn't gonna get you any more power...
i just recently did the tb by-pass on my gf's grand am, she was getting a consistant 17-18mpgs, then i did the by-pass, along with ported, knife edged, and half shaft'd her tb. now she gets a consistant 19-21mpg's.
granted her tb would get so hot if you sprayed water or carb cleaner on it, it would instantly boil...
i just recently did the tb by-pass on my gf's grand am, she was getting a consistant 17-18mpgs, then i did the by-pass, along with ported, knife edged, and half shaft'd her tb. now she gets a consistant 19-21mpg's.
granted her tb would get so hot if you sprayed water or carb cleaner on it, it would instantly boil...
Makes working on things easier later too. Like next time you want to pull the TB to clean it. Hell it makes reassembly this time easier when you take it off and clean it.
Far as the freezing, I am unconvinced it was a significant concern, have driven TB bypassed cars down to -23F. though if you dig into the science of it the greatest risk would be say if it were raining and mid 30s outside, the pressure drop as the air flows through the TB could conceivably lower temp enough to drop temp below dewpoint and begin freezing.
One friend says he has had it happen but IMO I would suspect his BBK TB more, it is a different design than mine was and seems more troublesome. I think it is just sticky in cold weather.
Far as the freezing, I am unconvinced it was a significant concern, have driven TB bypassed cars down to -23F. though if you dig into the science of it the greatest risk would be say if it were raining and mid 30s outside, the pressure drop as the air flows through the TB could conceivably lower temp enough to drop temp below dewpoint and begin freezing.
One friend says he has had it happen but IMO I would suspect his BBK TB more, it is a different design than mine was and seems more troublesome. I think it is just sticky in cold weather.
You mean the metal pipe that the hose coming from the throttle body plugs into? That pipe is what you connect the hose from the other side of the throttle body to when you do the bypass. Look at the link I posted from Shoebox.
