Hey all, the SE-RX7 club had another dyno day today and I found 10 more hp and 5 lbs of torque, bringing my total rear wheel Hp numbers to 161.6 and 127.4!! That is up from 152Hp and 122.5lbs/ft torque.

It is a nice steady climb from 50Hp at 2600rpm and levels off at about 160 from 6500 to 7500, peaking at about 7200. Torque climbs from 90lbs/ft at 2500 to a peak of 127.4 at 4500, then levels off at 120-125 from 5000 till 7000 and drops to 110 at 7500rpm. Nice flat torque curves!

My modifications include K&N air filter, TB Mod, 89+ Intake manifolds, 86 motor, 6port sleeves removed, RB Headers, Midpipe, HKS catback, and an electric air pump. Not too shabby.

All motor, no porting what so ever.

Sorry to rant and rave, but I am extatic!

Carl

 

I think you could get 10 hp and a little more rpm's out of a ported manifold. Do a search for info and pics. Me and PP13bnos posted quite a bit about it.

BTW, good job

but Im still going to top that when I get on the dyno with my redone exhaust

 

Holy ****.. 161 at the wheels... Thats almost 200 at the flyweel man. U will hit 200 im sure with ported intake manifold. Go for it.

 

No more RPMs available. RevLimit is 7800. From the looks of things, it wouldn't do me any good. My power band is 5000 to revlimit and the transmission and light flywheel will keep me there.

I thought about porting the manifold, but decided against it. I didn't have time and wasn't too sure if it would really work. I know you say it will, but I just don't see that much power out if it.

BTW- I am still running the PS, A/C, and the OEM fan. That is probably robbing some HP.

Carl

 

I'm still pissed I overslept.

 

Actually its about 185. Don't think you'll get 15 hp from an intake port job.

 

Actually your considering 185 would be slightly less than 15 percent drivetrain loss...I would consider him to be 190 but I think our cars are more in the range of 17 percent loss. The 2nd gen was dynoed at 160 hp tops perfect condition from the factory. 125hp even at the wheels according to RX7.com and another site I have seen. If u divid 160 by 125 u get 18 percent. But lets just say 17 loss in this case... The total would come out to 189 flyweel hp... I know u can get 10 hp with racing sleeves and porting manifold mazdaspeed7 style. He will back me up too for he has done this.

 

how did you get the 89+ manifolds to work? I am very curious.......thanks

 

You guys seem to inflate numbers a bit. I bet you get maybe 2 hp from porting the intake manifold. Probably even lose some through the middle. We need dyno numbers before you can state what kind of gain you get. The butt dyno is affected by the new mod syndrome. I know the Pineapple sleeves were tested to gain hp, but not the ported manifold yet.

 

That's some serious power numbers out of an NA!&nbsp Good job and this post should be archived to be as a guide on what you SHOULD do with an NA to make good power!&nbsp Congrads!



-Ted

 

I'm just thinking out loud here, but it would seem to me that as your bhp increases, the percent of your drivetrain loss would drop because your drivetrain loss would be constant.

In other words, if you have 35hp worth of parasitic drag on a 160bhp motor (21% loss), wouldn't you still have 35hp lost if you bolted a 225bhp motor into that same car? That would work out to a 15% loss.

I'm not an engineer, so I could be way off base here.

 

You're mostly right - at very high HP levels it works like a percentage to a point, and then starts to level off. The high-hp Supra and Viper guys have all begun to realize this. For our anemic little cars, though, it's not really a consideration. Per cent loss is where it's at

Carl, congrats on the numbers! You've still got a little bit to go before you'll put down 175 like my stock TII! Muhahahaha!!! j/k Good job!

Brandon

(This is Brandon from Moroso)

 

see how it does against a series 4 turbo II, that would be an interesting race.

 

SILVER88....Just what do you do with the electric air pump? VDI?

 

His website should have a writeup on the 89+ intake. I just can't get it to load right now.

 

Thats great man! I can only hope to get that much HP out om my na someday

 

That is why I didn't and wont port the manifold. i do not want to mess up my torque curve in anyway. Now, maybe if it was ported with a flowbench or something, then maybe.

Carl

 

I have a write up for the web, but I need to clean it up a bit. I will let you know when I get it up.

Carl

 

Hey Brandon. Thanks! I have been shooting for 160 to the ground since I first owned a 2nd gen. I just like the fact that I am 15hp shy of you and you have a turbo. Actually, what was cool was, I saw one TII dyno at 182 with an intake and exhaust. I am only like 20 shy, and he had a turbo.

Carl

 

Yup, it is powering the VDI, ut I had to modify the vdi to lessen the opening pressure. I should have a writeup on that soon.

Yeah, I know the page it was linked to has been changing addresses recently, so I have the files myself, I am just working on the HTML to get it so everything works.

Carl

 

how old is ur engine? wow those are great numbers...

 

I guess I should have mentioned that. It has approx. 70,000 and the compression numbers were 7.9, 7.8, 7.9 on the front and 7.4, 7.4, 7.4 for the rear. (hmm, I wonder if I could get one of those figure skating judges to help me out)

Carl

 

Now many of you people who say porting the intake manifold will only add 2 hp have EVER done it?? Go look at Pual Yaws site. I dont remember the exact numbers, but I think porting the manifold gained as much as 30% more flow, and like 10% more power.(I could be wrong on the exact numbers, but its in his site).

If you have NO experience with something, how can you say what it can and cant do. If any of you have ever briven a n/a with a well ported intake manifold or have dyno charts of before and after, then I would like to hear your opinions. But that isnt the case.

 

Well, for those that are interested, here is the chart:



Carl

 

Super smooth curve - nice flat torque band!
For a non-working 6-port, that's a really nice dyno graph!


-Ted