oldschoolrex

A turbo swap is not financially fesiable for me right now, so i was just wondering if anyone could tell me a few things I could do to make power with the NA motor. I've got a custom 3 inch-2.5 inch Y-pipe exhaust and some random cone-filter my friend put on for me, but there's got to be more.

Bison Asko

Yea there r a bunch of little thing u can do but by the time you spend time and money on these mods you will be better off getting a turbo. What type of rx do u have. If it is a 2 gen with the six port rotary there r a few tricks you could do. First off the 3" is a bit to much you may be loosing power (unless you decide to get a turbo). Also make sure you intake is getting cool air. Block off the EGR valve and the ACV this ensures that you always get a fresh A/F charge into the combustion chamber. Do a search on how to remove the emissions crap( leave the 6 port system if u have it and run it off the air pump). The single most thing you can do to get more power is get into the ECU, do a search in the ECU or EGI section and check it out. Other things you can do is reduce the weight of the vehicle, get rid of all the extra stuff. I would recommend blocking off the OMP and running 100% Premix, this way you can run synthetic oil and get a little more power that way (be carefull about the type of synthetic oil u use i like Royal purple and Idmitizu. You could also replace the flywheel with a lighweight one to get more of the power to the wheels. Dont forget about NOS that will get u a lot more power but it is hard on the rotary.

If it were me I would just save up for a turbo

Rx7_Nut13B

iTrader: (1)

If i wanted more HP and no turbo

FD Irons, Bridgeported
Race Ported Exhuast
550cc or Higher Secondaries
A computer MegaSquirt

This would be good for about 300hp without a turbo and still driveable on the street

O but it isnt cheap, most hp isnt Cheap, Sorry but it costs to play

rotarygod

iTrader: (1)

The easiest mods that you can do that will each give a noticable improvement in power are a header and a light flywheel. Then get into a standalone ecu such as a Megasquirt and get it tuned properly. That will be a good start and a noticable improvement.

VT_Rx7

do that flywheel and you will have next to no low end response. IMO. Not some thing you want to do if you don't have FI to compensate for the lost.

RETed

Welp, at least part of your reply isn;t BS...


-Ted

Aaron Cake

iTrader: (1)

Here's the question:

How much power do you want to make?

How much do you have to spend?

How much experience do you have?

Starting with those questions in that order is the best way to think of a project like this. The first two questions are most important. Question number 1 will often depend on question number 2.

rotarygod

iTrader: (1)

That's wrong. Physics must work different on your planet. A lightweight flywheel does not affect torque anywhere at all. This is a very false misconception. I had a light steel flywheel before switching to a lighter aluminum one and the car only gets faster everywhere with less weight. Whether or not you like the way the car drives is another matter altogether. I like it as it revs like a sportscar should rev. It frees up usable horsepower everywhere. Torque is only a factor of displacement and not wieght. That's it. A 500 lb flywheel wouldn't give you tons of low end. It doesn't work that way. Engine response gets better with less rotational weight. That and a header are the 2 biggest gains you can do easily to an n/a engine. Everything else should take a back seat to them.

SASSER

There's always nos.

SpooledupRacing

the only problem with a light weight flywheel in most cases is in city driving they suck when u let off the gas you will decel FAST.. however for me I dont care about that and a light weight flywheel is a big plus..

a few other things would be doing what u can with your laws

remove excess items:
egr
air pump
a/c
p/s (and get a manual rack)
make a custom cold air setup or a cold air box
porting the intakes
exhaust (nothing bigger then 2.5")
no cats
racing beat pre silencer
strait through mufflers (less restriction the better however RB mufflers are nice)
maybe going for a dual exhaust setup from RB
suspension upgrades (will not give u more hps but will allow u to handle what u got better and that always helps in keeping times down in the corners)

RoughRex

Correct me if I'm wrong but... when you push in the clutch the disc separates from the flywheel and disconnects the rest of the drivetrain from the slowing engine (including the flywheel). So, could you not remedy this by pushing in the clutch when letting your foot off the gas? Or is it that you have a stiff pressure plate and have grown to hate it in the city?

Jager

iTrader: (10)

Search, there are alot of great topics that have been beat over again and again in the past.

Btw, I'm not being a search ****, but this isn't new.

umi415

+1

micah

Check the archives..

This is a great post: https://www.rx7club.com/2nd-gen-archive-72/how-make-beefy-n-need-your-recommendations-31410/

scathcart

No, its not.

drft_180sx

^ lol i swear scathcart works for "NOS". But if anyone knows about Nitrous and rotaries, its him.

scathcart

No, I just Huff it.

anewconvert

iTrader: (1)

No harder than a turbo. Just dont be a retard with it.


BC

oldschoolrex

well in that case, since I have the turbo engine, ECU and Knock box, maybe I should just save up, but the seller of the engine didn't specify that it was an S4. Does anyone see this as a huge problem, putting an s4 TII motor into an S5? And i've heard NOT to do it but would I be able to modify the existing engine with the stuff off of the turbo engine? That'd be a lot cheaper for me, as i'm kind of running out of money and having to pay bills.

ericgrau

iTrader: (1)

You get a performance catalaytic converter yet? Check to make sure your 5th and 6th ports still work? Cold air intake? The VDI from the S5 is supposed to add a little. Royal Purple oil is supposed to be good for about 3-4HP. An aluminum hood, convertible wheels and a lightweight flywheel can lighten your car up somewhat, which will make it a little quicker.

After that if you want some more serious power without going turbo you can do any/all of these 3 items:
street port
SAFC II or better yet a standalone ECU
NOS

Performance tranny oil will help you shift quicker, as will a lightweight flywheel.