VT_Rx7

So I have a couple questions. I want to thank you in advanced for your responses. I do not mind you saying that my ideas are stupid just explain why.

My plans are to
1st- (tomorrow) Custom CAI to my fender well.
2nd- Get a pipe made to eleminate the precats and the cat, I may just get gut the cat I am not sure if it will make much of a difference. (I have no emmisons in my state. (After do this will I still have some lowend power?)
3rd- WALBRO 255LPH KIT
4th- Fuel Pressure Regulator, do they work as claimed. (explan if possible)
5th- Ported S4 intake manifold. ( what do you guys that have done this think of it?)

Also is the TB mod worth my time?

I think that was it.
Does this sound like a go plan?
Is there a better order I should do this in?
Will my stock injector be able to hold up or will I need t2 injectors?
For my application is a SAFC nessesary? and can I use the old school one with the ***** I am straped for cash and I leave for VTech on the 15th?

AND THE BIG QUESTION HOW MUCH DO YOU THING THIS WILL YIELD?

Thank you.

adrock3217

1. Super awesome.
2. NO. An NA RX-7 uses the cat for back-pressure to open the auxiliary ports. You will either A. lose all low end power or B. lose all top end power, depending on whether or not you zip-tie open the aux. ports.
3. Useless. You don't need an upgraded fuel pump on an NA without serious porting and custom intake manifold.
4. Same as above.
5. If you do this correctly...yes. But, in my opinion (and others, I would assume), the S4 intake manifold is TOTALLY worthless in comparison to the S5 intake manifold, especially when ported. The S5 manifolds are sooo much better...


Of the mods listed that I accepted...you might see 10-15 rear wheel horsepower. From the CAI alone, maybe 5-8rwhp. PROPER porting of the intake manifolds (S5) will yield the other half.

Stanello

iTrader: (1)

1- Good
2- I would reccomend a Racing Beat header and presilencer instead. You will gain power and still have enough backpressure with the presilencer to keep you aux ports functional.
3- Waaaaaaay overkill. Do not do that.
4- The stock fuel pressure regulator works fine.
5- You can do it, but don't look for any significant gains.

TB mod, not worth it on an NA car.

An SAFC is a good idea since NA's run pretty rich from the factory. You can lean it out a bit and get a little more power and slightly better MPG. Keep the NA injectors. They'll work fine.

You should look into getting an exaust. It's one of the best power gaining mods for the NA.

VT_Rx7

FOr what I am doing which would you choose if you where limited on cash.

http://cgi.ebay.com/ebaymotors/APEXI...QQcmdZViewItem

Or do I have to use this

http://cgi.ebay.com/ebaymotors/Apexi...QQcmdZViewItem

Thanx for your help guys.

Stanello

iTrader: (1)

I'd get the SAFC II. Keep an eye out in the parts section on this forum. I had trouble selling one a while back for $150.

KillaKitiie

Dont touch your fuel pump and dont add a fuel pressure regulator.


I did the TB mod becuase im trying to allow the engine to ingest as much air as quickly as possible. two less plates=more room for air.

I ported my upper and lower intake manifold's as much as physically possible. then polished them=added more power than my single exshaust.

3in single exshuast. eliminated about 30lb's of weight (with heat sheild's and muffler sheild's gone)

removed power steering pump and ALL AC components(including condensor and lines)including ps bracket.= way faster rev's and much quicker acceleration.

removed aux ports. people will bitch over this one,but done with the above mod's my car pull's harder after 6k than at 3.5k. ive removed the rod's in the lim and plugged the holes were the aux port rod's went through.=good top end(for my setup)

I think you have a good idea of what you want to do.like me i went all out gutted everything 100%.but you may want something more comfortable.which you may want to keep your ps and ac and such.

ohh and with the mod's i have below my buddies stock 98 gs-t eclipse in second at 40 mile roll. I pull instantly a car and a half before shifting to third at 80mph.
soo NA can be quick...fast even if built right.hell i just bought a 96 gsx eclipse for my wife and my car will still walk that biatch...not for long though

VT_Rx7

or this http://cgi.ebay.com/ebaymotors/ws/eB...MEWA%3AIT&rd=1

VT_Rx7

Thanx man. But if I take out my aux ports will I have any bottom end. I have am back to Blacksburg, Va and that place is full of hills. WIll the car still be driveable.

adrock3217

Are you really saying that removing AC and PS you got *noticeably* faster revs? Sorry, I find this EXTREMELY hard to believe. The pulleys dont weigh much, and they free wheel (AC when off, PS above 30mph)....Placebo!


And again with the placebo, porting the intake manifold (stock) will net you no where near as much as a full exhaust. And 3" is..wow, nice and not good for an NA. I wouldn't go over 2.25" for an NA...Unless it has some serious (read: bridge/pp) porting.

I don't know what you are trying to say with the 3.5k vs. 6k rpm comment. It is in an NA rotaries nature to pull harder, the higher it is in the revs ......

VT_Rx7

What is the best Air flow sensor that will work with my car. Its a 1987 SE. The MAF that is up that right now is horribley restictive.

VT_Rx7

Don't kill him lol.

KillaKitiie

Yes sir i am saying that with all the power steering and ac components removed you will notice a difference. hell it removes like 45+lbs from the car.And yes you will notice a difference in your rev's. Now take notice that these mods add up soo if you do this on a stock car it's not going to be a big difference you get it?

OMG yes porting your manifold's yeilded my biggest gain besides an exhsuast.i had most of my mods done by then though so again it added up.wouldnt be as much on a stock car.

you trade low end for high end when you take the aux ports out soo on a stock car i would keep them in. but in my case i wanted to allow the engine to ingest as much air as quickly as possible. so if you got into my car you would definatly notice less low end.but as soon as the revs get higher it pulls alot harder with my mods.I also wanted highend power becuase when i shift at7k my rpm's go to about 3.5-4k right were my powerband pick's up.

adrock3217

I think...grr, the name slips my mind right now, but SOMEONE on this forum adapted a Cosmo AFM to an FC. However...I don't see it being worth it. The only way to eliminate the AFM is by going standalone ECU.

KillaKitiie

friendly rotorhead debate...

adrock3217

Whaaatt?! You fail! You never stated any of these as being "stacked with other mods". You stated that the intake porting added more horsepower then your single exhaust. Which is NO WAY near true!

And I never called you out on weight removal and the feeling of the car, I'm all for that..but theres no way you ACTUALLY had increased rev response. Stock flywheel and stock pulleys would be the major hinderance, and simply removing 2 contact points at the e-shaft seriously is not noticeable. Placebo.

KillaKitiie

Reread my original post i never said i had a full exhsuast i have a 3in -2 3/4in catback with a n1 4in straight through muffler.to be exact.and i spent about 20 hours porting,polishing and matching my manifold's together and to the tb.so yes i yeilded more than 7-9hp...felt like 20+..but thats a buttdyno so who cares.

while i respect your opinon on the ps and ac thing i see it as removing two rotating masses being driven by the eccentric shaft.yes its only two lines but when your idleing at a stoplight its noticeable. for me it's two less thing's draging the engine down..especially at higher rpm's. sorry for the spelling.

i was going all out for my car its probably not typical for an average driver but for me its what i wanted from the beginning.

adrock3217

Cool beans :P

Yeah, I agree on the idle thing, not having those extra pullies on there seem to make the engine...uh..."purr"?

It's hard to explain.

DeclareYrWar

https://www.rx7club.com/2nd-gen-archive-72/how-make-beefy-n-need-your-recommendations-31410/ that has everything you need to know and who'd have thought it would be in the 2nd gen archives...search. this has been covered more times than i can count. not trying to be an *** hole or nething, just dont see a point in getting these threads started over and over again about how to build a good n/a setup when its already been covered in great detail.

VT_Rx7

Trust me I have read those over and over again. I just want to ask some questions based on my own applications. thanx anyways though.

VT_Rx7

ttt