what kind of gains for n/a?

what bdc's dyno graph and track times have to do with a hogged out throttle body is beyond me, maybe if the dyno represented a before and after comparison of the throttle body mod it would make more sense... that car has far more than a ported TB.



It doesnt take much to hog out the tb, $150 is a bit pricy for something you can do yourself easily but not surprising becuase it is a mostly labour intensive task, involving a number of hours. However, it's not a task which requires the skill of a person capable of building cars that can put down those numbers, just someone that can use a dremel, the modification is public knowledge and easy to implement.



http://pengaru.com/~swivel/cars/rx-7...3/IMG_2180.JPG



Not bad after a few hours of dremeling and ~$25 at the local welder to have the double throttle holes filled, note the bump in the primary intake port is also gone as the passage responsible is not needed in my application... this wasnt even the final result it's just the most recent pic I have.



No offense intended to BDC.

I'm not entirely sure it matter what age we were when it was 'homebuilt', Suds. I've been working on my car for the past 6 years since I've owned it. I started when I was 24 and am still working on it today at 30 (and probably will). What does 16 have to do with this?



The point of the dyno sheet and time slip was, quite frankly, to get you off my case in the event you thought I was someone who didn't have a clue trying to peddle garbage. Infact, I do this for a living. I've got alot of cars on the road now and am getting more. I'm not a fly-by-night type of guy and I think the numbers I posted, as well as some of the work I've done, hopefully substantiates this.



I don't mind peoples' opinions; I think anybody can say what they want. However, I think that if you want to persuade someone to your way of thinking, you should have two things: sound reasoning and rational arguments, as well as a tactful approach. The way you approached me was fairly abrasive and taken offensively in as much as I and others read it. I'm not sure if this is what you intended or not; it's easy to do that sort of thing in text when you can't convey emotion, tone of voice, or body language. God knows I've done it a million times and have gotten in trouble more often than not.



On your technical answer, I think you're incorrect. Every 90 degree flat-spot in the intake plenum and overall charge stream will make a significant difference, even when air is being pushed in. You can try this for yourself on your setup; you'll notice the difference all over the board. If it breathed right past the "efficiency range", then what would be the point of porting the engine on a turbo application for example? Removing flat spots (creating smooth transitions, tapered ends, and radius'd turns) as well as reducing pipe and tunnel wall turbulence (to create a thinner boundary layer) all have an overall, dramatic effect on the efficiency of the engine to 'injest' in a greater mass of air per stroke. This is easily provable and documentable. The purpose of the TB mod I and others do is to yank one more low-efficiency link out of the chain as it were. It does work, works well, and is worth the money in my opinion.



B

Nice job on the TB, Pengaru. Looks alot like mine. https://www.nopistons.com/forums/pub...IR#>/smile.png I think, however, you may be downplaying the level of skill and OTJ-training required to practically make this one worthwhile. I've had people come to my house with hogged out TB's they've done that were not only poorly done but just plain busted (they were ruined). It took me several tries to learn the proper procedures (as well as buying the right tools) to do the job right. I had to learn what type of sanding materials to use, what type of bands, flapwheels, and flapwheel makers to use, and the like. Sure, someone can do it if they're already familiar with this stuff as well as the point of modifying the TB, but I seriously doubt that every average Joe out there is going to get a good result off the bat. I've done a number of these things and am still looking for ways to shave off labour time and do a better, more consistent job (mainly finish-sanding) on the inner walls.



B

I didn't intend offense in my first (or any) post in this thread, and so I apologized, and I definatly should not have knocked your product in the thread you are using to offer the service.





I would have to agree with you here, but take a look at this thread and tell me what you think.



http://www.rx7club.com/forum/showthread.ph...threadid=201954





I know that you are not a fly by night kind of guy, I have seen and noted your accomplishments many times and have a great deal of respect for your skills and knowledge. On a side note you may want to start a new thread advertising your services.

I think for some people it is worth the 150 because they don't want to deal with doing it themselves. Maybe they figure they can work a extra few hrs at work and just pay another to do the job. But then there are people like me who like to do everything themselves. I woulden't pay 150 to have that done to my TB only because I enjoyed doing it myself, some would rather pay.

so why don't you do it for 13B-REW's ? https://www.nopistons.com/forums/pub...DIR#>/wink.png

cause he knows you don't need to spend any more $$$ on your car https://www.nopistons.com/forums/pub...DIR#>/wink.png

I tried on one of Steve Kan's spare TB's and I wound up breaking a hole through it. The casting on the body is quite thing; doubt I'll ever try one again. Doesn't appear to be worth it in my opinion.



B