Um, I USED TO HAVE AN NA!!!!!!!!!!!!!!!!!!!!!! I did everyting conceiveable to it. You know what, it was STILL slow!

BTW, Yaw has a flowbench. I don't see you flow testing anything, just hogging it out with a porting tool any way you see fit

 

does anyone know Paul Yaw's website address? i think we all want to see it....

 

http://personal.riverusers.com/~yawpower

 

interesting, ic Felix's where is getting his theory ( whatever) with only using a grinder here and there, ya its possible ur only getting like 2 hp. But if u did it like yaw, using a flow bench, and welding and reshaping etc, with all of the testing tools i can see making a lot more hp out doing this. But then again this is just and observation i made, i don't have a ported manifold etc. no exp. Where is soul? he has a ported FD manifold on his car. He told me he gained 30 hp from the manifold and port job.
the link about his port job

 

The FD TB has bigger throttle plates. Also, soul's car has a TO4R shoving air through it. He doesn't count

 

Well, I think I am going to have to disagree for the most part. My car, be it not the fastest, will keep up with and or beat most of the people in my area that are willing to race.

But then again, the cars that are worth beating, I agree, the N/A is slow. Hmm, maybe a turbo next since I really can't do anything else to my car.

Carl

 

Great! What was the final mod that gave you another 10rwhp?? It can't be the removed sleeves, or could it?

 

Come to the dark side! Hang a TO4B on the side of that thing at about 8 psi

 

Nope, the sleeves have been gone for a long time. The only thing I have done since the last time was the electric air pump, TB mod, and my A/C compressor blew up. So, I guess all that parasitic drag is gone.

Well, I do have an OEM 88 turbo, manifold, and a starion intercooler. With my tax return being what it is, I am very tempted to add some weight to my motor.

Carl

 

Most likely it was from the stucked VDI that caused you the potential 10rwhp. Now that it's working, the potential has been unleashed.

 

wow, so from doing the TB mod, and getting rid of the parasidic drag from the a/c and air pump gave u 10bhp. and u have proof, nice ( u did scrap the belt on the a/c right? if not even more wow!)

 

oops double post.

 

I think it all came from the A/C compressor and the OEM air pump. The VDI has always worked.

Carl

 

VERY nice numbers. Gives me hope. I can't wait to finally purchase a header now.

 

well, mazdaspeed7 is porting my intake manifold right now, i will make it a point to get a dyno with and without the manifold to see how much it actually does do, going from 86-88 manifold to the 89-91 should be good for 10-12hp im thinking, and after that its the porting job that makes it go up, but i will definitely post the numbers when i can do both

 

u make sure u do post that, everyone on this entire site wants to here!

 

Let me know if you can get that 10hp header cause even Mazdatrix, Mindtrain and RX7.com admits that it'll only add about 2 hp tops.
So all this time, it was the parasitic accessories that's been sucking up 10rwhp.

 

How does a header give only 2hp. I figured it would give 5 WHP compared to a streight pipe. The potential goes up with the more mods u have. I would think that RX-7.com would say that because they dont sell headers
I bought my race pipe off them.

 

Headers have minimal gains over a race pipe w/ stock exhaust manifold. 5 hp, tops.

 

I'm somewhat confused here, you mentioned later in the post that your 10rwhp gain was from removed airpump and blown A/C. But here in the quote you're still running the A/C and still gained 10rwhp with it?

 

Yea I have stock manifold and gutted pre-cats. So I want to get a header to smooth out the flow some.

 

im a little confuse too, So did u take off the belt or what?

 

i'm a little confused too... don't you change to the 89-92 manifold because it's larger piping? wouldn't then porting give the same gains? correct me if i'm wrong please

 

Looks like I had a typo. I do not have the A/C compressor hooked up since it blew up on me. Sorry for the confusion.

Carl

 

I didn't change because of the larger piping, I changed because it was a more efficient design. Plus, the VDI system works. Long runners for low end torque, then switching to short runners for high end power.

As for the manifold porting, I am sure it will work, but, the way everyone has been doing it so far is just to grind what ever looks good or looks like it could help flow. If there was flowbench testing on the porting, then I would be more up for it. The way the manifold is designed, I really don't want to take something out that is ment to be there for some velocity reason. Kind of like how you don't want to go honeing out the AFM.

Carl