TheTwinTurboRX-7

I want to make my N/A faster. What are the best/most cost effective ways to make the engine make more power. I would appreciate any and all advice. I know that some of y'all have had some good success with it and I want to know your thoughts.

mazdaspeed7

You can get the most hp out of a ported engine, but that requires a rebuild, or an engine with very, very low miles(such as a recently rebuilt). Next, full exhaust/intake. I see you already have a race pipe, but do you have a good cat back? You dont need headers, and the gain is minimal over a racepipe, but the car is MUCH louder with headers. Pulleys and electric fan will help a little bit. Porting the intake manifold makes lots of hp, but if youre not familiar with a grinder, you would be better off etting someone do it for you. The TB can be bored out to give a few extra hp. 6 port sleeves can be removes for a little extra hp, but this is best left until you have plenty of other mods, and need all the extra air flow you can get. The black plastic elbow has a lip that appears to create a lot of turbulence, so a little more airflow can be gained by smoothing that out. You can cut the cruch washers off your spark plugs; it moves the spark closer the the combustion chamber, and slightly raises the compression(but there is still plenty of clearance, I have checked it). You can put the MAF sensor from an 92-95 929 on any of the 89-91 n/a's, it plugs right in, but is bigger. Weight reduction. Advance your timing a few degrees(you might need to switch to a higher octane fuel though).

TheTwinTurboRX-7

Ok, thanks. Not sure what the bigger MAF would do, mayhaps you could explain. What about a lighter flywheel? Also I know everyone hates it, but what about those three little dirty letters. Everyone knows the ones.

Whispers quietly, NOS, and jumps into flame retardent suite.

Also does anyone know how much streetporting might cost? Trying to get an idea of what my options are and how much they cost.

kliftin

How can I get a 929 maf. Junk yard perhaps.

rx7_turbo2

Best way to make an n/a faster?

Bolt a turbo to it

jimmyv13

Is a racepipe a midpipe or downpipe?
Does the downpipe attach to the stock manifold?

kliftin

An N/A wouldnt be an N/A if you put a turbo on it. I prefer less complications.

Besides Can you rev your turbo to 9000 without doing damage.

SpeedRacer

A racepipe is kinda a downpipe/midpipe. It connects right off the stock manifold and connects the y-pipe replacing the two pre-cats and the main-cat. A downpipe just connects off the stock manfifold replacing the two -precats and connects to the main cat, or whatever you have there.

Mykl

The bigger MAF does this...

Bigger MAF = bigger hole
bigger hole = more air
more air = more fuel
more fuel + air = more power

The only thing you need to remember when trying to figure out how to make more power is that the better the engine breathes, the more power it's going to make.

It's a matter of moving as much air and fuel in as quickly as possible, and then moving it out and then moving it out just as quickly.

There are different approaches to this apparent in various engine designs. Take the 5.7 Chevy V-8, it's a big engine, so it moves a lot of air, but it doesn't rev very high. But it can move a large amount of air over a single revolution, so it doesn't need to rev high.

Take the I-4 in the Honda S2000. It's tiny in displacement, so it can't move a lot of air per revolution. But it can work faster and rev higher than the 5.7. Basically, it moves less air, but it moves it more quickly.

torque X RPM / 5252 = horsepower

Lets plug some familiar number into that...

140 X 4000 / 5252 = 106.6

So at peak torque, your car's engine makes 106 horsepower. Of course these are stock numbers. Lets reverse the equation to find how much torque you're making at peak horsepower...

160 X 5252 / 7000 = 120

Okay, so that went beyond the scope of the original question, but this is still some useful info to know.

gnat's-ass7

Dude, don't worry about the NOS thing. I think a rotary would handle that better than a pisoton engine.

Streetporting is 'spensive, and not very reliable (so I've heard)...
Intake, exhaust, ECU, clutch, flywheel (more important than you'd think) ported throttle body (rx7.com has some), NOS if you wanna, etc.

Ryde _Or_Die

NOS NOS NOS NOS!! Don't be skerd to yell it. I will have it soon enough, lol. Think exhaust will come first though.

PaulC

NOS is a great way to make cheap HP but its also a great way to make lots of scrap metal too

How much of a boost can a NA take before things break? 50hp, 75hp? I know our rotor housings arnt nearly as strong as the T2 engines.

rx7_ragtop

Then you know wrong. Essentially, the difference in the NA and TII rotor housings are 2:

The exhaust sleeve on the NA housings have a "diffuser" in them, which interferes with flow.

The coolant passage that comes out the side of the TII rotor housing is plugged on the NA.

Brad

BhamBill

Sorry, can't resist, it's still true. Go to a driver's school. The best thing you can do is learn to drive the car to it's potential.

Mykl

I like you, you're smart.

That thinking has a lot to do with me sticking to the n/a RX-7's for the time being. It's easier to work on your driving skills in a car that you can push to the limits on the street in "relative" safety. On deserted backroads and such, of course.

pp13bnos

iTrader: (1)

The thing that i like about the n/a is that you can beat on them pretty hard for lots of miles. You don't see lots of T2 or 3rd gens going 150-180k miles. Not to mention, the engine compartment is pretty easy to work on. Never have to worry about running to much boost.

I also think its kinda fun to tweak the car a little hear, and a little hear....just trying to squeeze out just a little more power. Imop, its alot of fun. CJ

CanadianRX7

my friend had a first gen and he tried to blow his n/a engine and he couldnt do it.

he did 10min long donuts in first gear with the revs at the top of the gauge and nothing even happend. he shut it off and started it back up with nothing wrong.

it was like a $200 beater
at least he was beating on a first gen ey!!hehe

Mykl

I love 'em all the same.

Still though, it's nice to know that they can stand up to that kind of abuse.

RarestRX

Yo,


I'm with Mykl and BhamBill. I've had my car for 2 years now. Mastered it? Please, I spun it trying to drift in the rain today. I boggle at people doing drastic mods to their cars before they've even had it a year, or a month, or even a week! Once you've gone as far as you can, THEN go crazy with NOS, Superchargers/Turbos. Until then, drive it until you feel comfortable in any situation. Whether hitting that onramp at twice the listed speed, or hitting that apex in a full four wheel inertial drift. That's what I'm aiming for!

KS
1989 GTUs "Ground Control Coil Overs or Racing Beat Springs?"

t_mak@mail.plymouth.edu

Driving on the track in a NA and turbocharged car is a little different too. You have to make sure you keep your turbo spool up in teh turns to get the optimum power out of the turn. In an NA, you dont have to worry about ti as much. I guess thats why they designed the twin turbo, to eliminate the turbo lag

pp13bnos

iTrader: (1)

I was drifting my FD through a corner around a private single lane road, and had the second turbo come on. Almost made me end up in the ditch. N/a cars are much more smooth and even.

There are people who are'nt in to the cornering thing. *gasp* Just the straight line thing.

I'll admit, i'm by no means a master drifter. However, when it comes to launching my FD from a dead stop, i feel i'm pretty damn good. In stock trim i got my car to turn a 13.6xx@101.96. NO k&n, no cat back etc. Bone stock. Profesonal drivers did a 13.5@102. I know i would kill myself, if i wrecked my FD tryig to pitch it through some corners. In the two years i've owned it, i've almost got it payed off. Its just to nice of a car, to end up in a ditch. CJ

BhamBill

Thanks Mykl! I know it's really tempting to add power, add power, add power, but not everyone here has learned real car control. After about 20 years off I started autocrossing again a couple of years ago and it has refreshed the skills I've had for a long time and I'm learning a lot too. Watch the people who are national champs drive and it humbles you. And it's a great environment to learn.

For a few hundred dollars there are legitimate car control classes all around the country. That's money well spent.