I just happened to have an extra TB from the SRT6 engine sitting around and decided to take a look at it again...

It seems the throat of the TB is pretty darned polished from the factory, so there's no need... Also, these dimensions and photos should help you out... the throat is 74mm and the wall thickness is 3mm. The butterfly valve sits inside the throat at a +13% angle at the base, and -13% at the top. the clearance inside the throat wall is 0.15mm. The thickness of the butterfly valve armature is 10mm and the diameter of the retaining screw holes are 8mm which only leaves 1mm of material on either side before the screws rip through the walls of the armature.

The butterfly valve armature is pressed onto the clockspring mechanism inside the DBW motor housing and secured by a retaining pin on the opposite side... If you ordered a new TB, butterfly valve or associated part from DC, you will be told that the parts are not servicable and only sold as the entire TB unit... So, this means you cannot remove the armature to grind it down...

The clockspring for the butterfly valve is really quite torqued (strong) and is very difficult to press open... It is my opinion, that if you ported the throat of the TB at all, even 1mm you would cause the failure of the housing from the pressure / torque of the clockspring and probably rip the armature and butterfly valve out of it's guide, or crack the aluminum / magnesium casting with the repeated opening closing of the valve... Not to mention the concept of porting the throat and creating AIR GAPS between the butterfly valve... Not good for the idling of the engine...

Hope this helps you reconsider your modification idea... Any other ones you want to discuss ?

 

You have to be one of the most hard headed people I have ever found on any forums. You dont even know what you are talking about on a P&P throttle body. Why dont you do some homework and look at any LS1 website, they are all over them. Then you can come back and post with some knowledge of what a P&P throttle body looks like. (mayby some new pictures too!) All you want to do is put down people. I dont care what you do for a living, how old you are, how much money you have or how many cars you have modified from a street car to top fuel dragster for you daily driver getting 30mpg and a topspeed of 333mph! You are still just an internet bench racer!! Why dont you dyno your own car and take your car to the track, or give us some bright ideas so we can rip on you. If you dont like what you read then close the thread and move on, or post something a bit nicer than calling everything I do trash, or its not going to work, blah blah......

For my car having only a CAI, (which I proved you wrong) the other small "mods" must have helped some!! My numbers were more than impressive. I never said you were going go gain 15whp from everything you do. Now back to the throttle body. You can remove around 1.5mm per side, tapering it up from the blade to the top, increasing velocity! Yes, even on your s/c engine. Narrowing the shaft is common sense, more volume at the smallest point, the more it has a chance of flowing, and yep thats right, equaling more power in the end.

I dont think anybody really cares that you post pics of a torn down motor. Thats cool and all, but not on the subject. Dam now you are "specialist" arent you! Why dont you put that thing back together and in a car, and we will see how your stock 13degree throttle body finely tuned stock German machine runs. Oh yeh, with those cute hose clamp pics you posted.


But I am still here for fun, and will keep posting of each mod I do, with pics and what I think of it. I just prefer you not to reply and run your mouth unless you have a positve note on the thread, or probably anybodies thread for that matter. We are all on here for the same reason, sit down and think about it. We all own the same car and want to go faster. Why dont you join in on those good things.

 

YIKES, what hose clamps ?

I do appreciate your efforts and not knocking your attempts at modding the car... It's just not that efficient... Perhaps you should do some research on how even AMG modifies there own engines for the DTM series in Europe... They are concentrating their engineering expertise on certain other engine aspects that develop HP...

As far as bench racing, you obviosly are new to this forum... This is what I mean about NOOBS jumping on the forum without doing their research, especially about performance modifications to the Crossfire and trying to sell things to the membership without being slightly expert... Do you think I'm the racing moderator because of some arbitrary reason ?

http://www.cardomain.com/ride/2487495
http://nasa-tt.com/Socal_Standings
http://www.youtube.com/watch?v=C9DqoxA55KY
http://www.youtube.com/watch?v=DCcIH2nM04o
http://www.youtube.com/watch?v=UesITJixtsk
http://www.youtube.com/watch?v=jnMEki_laS0
http://www.youtube.com/watch?v=UY2joOZVbLU

 

Yikes... You think that maybe I've done that once or twice before ? I was the person who got the Crossfire classed with SCCA in 2005 and it took a great deal of time and effort because the Chrysler engineers in Detroit didn't even have the specs on the car from their Mercedes counterparts in Germany...

BTW my vdeos in the previous post, those were with the NA engine, and yes that's what the engine sounds like on steroids... I'm just now getting close to installing the modified AMG engine... This will be fun to see how close it dyno's to 400 hp... Can you spell ROCKET SHIP ?

I hope you keep working on your modifications... I'm with ya, not against ya... If you ever want some ideas where you can really goose the HP out of this engine feel free to ask...

 

HDDP why don't you post what you would do or wouldn't do and what you have done, as far as performance mods , and make it a sticky . I think we all could benefit from your experiences.

 

Nice work BDJ. Narrowed throttle shafts are a great way to increase CFM. Sound like you have a lot of experiance. Things like this are basic, but very over looked. I would sugest from a business stand point to do a flow bench before and after your work. I would bet you pick up 20cfm. That throttle shaft is realllllly thick. Could the throttle body be bored out and a larger and thinner butterfly be installed?

 

Wow, this is gettin ugly for even my drama loving taste.

 

You car guys should start working together to improve the car for all our sakes. I'm sure all of you know some things better than others, but together you both can make it even better. Don't let all your know how go to waist fighting each other. I don't know jack about cars so I need you guys to figure it out so I can buy it and have someone bolt it on.

 

BlueMD SRT6 YOU WON'T HAVE TO WORRY SOON, YOUR A MEMBER OF THE BEST CAR CLUB IN MD!

 

I hear that man, lets show these other clubs how S. MD does it.