REFLUX

i want to put in a 3" exhaust on my BONE STOCK 90 TII
i do not want to blow my engine NOR do i want to buy all this extra BS just cuz of the exhaust
BS = SAFC, 720's, FCD, FPR, pump, TID, cone filter, etc

i DO NOT want 300+bhp, i am basically doing this mod for reliability reasons
(i got a great deal on the exhaust, so 3" is a must)

would i be able to ONLY put in the exhaust & leave everything else without compromising the integrity of my engine???

if not, what would be the simplest/most minimal way to put the exhaust on while avoiding a blown up engine?

Scott 89t2

with a full 3" exhuast and stock intake you'd probably be hiting around 9-10psi. thats what I hit. so you'll probbaly need the FCD. and I would recommand a fuel pump and rewire it. but injectors and S-afc would not be needed.

if you put a custom cat in. that would drop you back to the stock 8. and you wouldn't need the or pump.

REFLUX

here's the exhaust setup:
RB downpipe & presilencer
custom 3" piping to a single tip with stock-ish muffler

would the presilencer be good enough to drop boost levels to 8??

gsracer

doubtful, you'd be hovering right around fuel cut. If you keep the stock intake, with the dual wastegate passage effeciency of the s5 t2 and 3'' exhuast like Scott said you should be around 9-10 pounds. You can get used FCD's for like 50 bucks and a walbro goes for 90 bucks on group buy. The FCD takes a whole 5 seconds to install, literally. The fuel pump isn't hard at all either. With basic tools and any sort of mechanical inclination the most time the fuel pump swap should take is about 30 minutes.

Cheers!

no.. a presilencer.. is only slightly more restirctive then a straight pipe...

if you want to eliminate boost creep put the stock air box back in with the stock filter and install a cat.

at this point, i fail to see the reason why you would want a 3 inch exhaust system, since you are choking what you are trying to free up...

either you are in or you are out... there aren't in betweens

Scott 89t2

no. all the RB ones have the presilencer

Ryde _Or_Die

Ya spend the $200 and do it right and save your engine. Just wait until you have the $200 (however long it takes) to get the stuff and keep the exhaust off the car until then.

Cheers!

i know scott... u still want yours? i'll take it off your hands if u don't want it

Scott 89t2

my what?

REFLUX

alrite, the FCD & pump is fine with me, no biggy there
it's when i get into S-AFC, 720's, etc
i dont want to DYNO TUNE my car just cuz i put in an exhaust, im not even looking for crazy power

btw, would i need a fuel pressure regulator since i'm upgrading the pump??

Scott 89t2

nope

REFLUX

can anyone else confirm this?
i've heard of stock FPR's dying & setting fires (or something like that, some plastic diaphragm lookin thing)

Ryde _Or_Die

You are talking about the pulsation damper. It is not a fuel press. regulator but looks similar and is located where a fuel press. regulator would be.

Chixican

iTrader: (1)

At least in the s4 the FPD's have a stupid little screw on the end that tends to come out over time. Mine did and it leaked fuel all over the engine bay, luckily nothing happend and no fire. Anywho, the s5 one's don't have the screw and I think they're supposed to be more reliable because of it. That's why i'm gonna switch mine with my friends s5 lower rail so I can get the "good" FPD.

dr0x

Thats the pd again. The FPR is on the other rail and has a vac line coming off it.

TonyTurboII

Very well put.

Dont bother, the Zenki rails are better for future upgrades.

chaz805

forgive me, Im new, but Im planning on dropping a fresh motor, a 3" apex exhaust, a FCD and a HKS intake, will I need to do the fuel pump too? If so what fuel pump am I looking at? and how will a down pipe and pre silencer affect my boost levels?

TonyTurboII

I had the setup you did, and I was running a high flow pump. Its a good idea to put one in.

A steal at only $120 from the Rx7 Store.

http://66.216.67.51/product.asp?0=211&1=260&3=321

You looking at boost levels around 10-12 psi. Thats riding the line of dangerous for the stock fuel injectors/ecu. It would be a good idea to port the wastegate on your turbo while you have the motor out. Id still have a motor today if I did. If you have a few extra $, id get an S-AFC off ebay too, you can probably find a used one for a decent price.

dr0x

Dont waste your money at rx7 store. Some guy on ebay bought a ton of the walbro 255lph pumps and is selling them for 85 bucks a piece.

chaz805

forgive me, Im new, but Im planning on dropping a fresh motor, a 3" apex exhaust, a FCD and a HKS intake, will I need to do the fuel pump too? If so what fuel pump am I looking at? and how will a down pipe and pre silencer affect my boost levels?

TonyTurboII

Are they the high pressure or low pressure ones?

Some big time fuel system distributor by my house threw like 50 of the Walbros away. He said they were crap. Theyre not crap, he just sells alot of **** to race teams making them useless to him. It sucks. I wouldve snatched one up if mine wasnt on the way then. Plus they were gone by time I heard about it.

BTW that pump is a steal at $85, I suggest you get one.

dr0x

With the intake, dp and presilencer (assuming those replace the cat) and the apexi cat back you would probably boost to 10#s )creep to 12 or 13 on a really cold night). You could possibly sneak by with the stock pump. However, like I said before there is a guy selling 255lph walbro pumps on ebay for 85$. That is the cheapest Ive seen them. If you are going to do more mods in the future, get the pump now. Hell Id get it even if you werent doing more mods. Your stocker is like 16 years old, its going to crap out sooner or later I wasnt aware there was a walbro 255lph high pressure and low pressure pump. Are you thinking of the walbro 190lph pump?

TonyTurboII

I was under the impression alot of people were having problems with a version of the 255lph one. From what ive heard/seen/read theres 2 different ones. I could be wrong though.

HeffBoost

Yeah, there's a high pressure one for EFI & a low for carbs. It's the GSS341 that you want.

I've got a few thousand miles on my Walbro/stock FPR and am having no problems. It overwhelms it by 2-3 lbs. on my rig.

Port the Hell out of your wastegate orifices and then get a MBC to put boost where you want it.

REFLUX

thanks so much for the info guys!!!
looks like i've got an FCD lined up & I know a site for good pricing on walbro pumps!!

*crosses fingers*