TeamRuffRacing

hey guys. i have a 90 turbo2. its completely stock besides a racing beat REVTII exhaust.

now heres my issue...

Im looking to start making some power (300-400 range) but i dont know where to begin!! (i have researched, a LOT!!)

what should be the first thing i should invest in? in what order should i get them?


1. Turbo?
I was thinking about going with a Holset hx35 but that might be too small(correct me if im wrong) so if that doesnt work then maybe a Hx50? (the late spool with mpg's! right?) im also not looking to run crazy boost (25+)

2. ECU?
I want to go with an S-afc but i dont think that will work. so maybe an rtek 2.1?(maybe both?) what would be a good choice for a street car? i know i will have to retard the timing but will the rtek be able to do it enough to be safe? Microtech is ideal but i really dont want to have to re-wire the car...

3. Fuel?
720cc secondaries? walboro 255 in the tank?

4. Intercooler
i dont really think brand makes a huge difference. but piping size? what have you guys found works great?


i really just want to be able to have a fun, reliable , daily driver with AC, and PS. if you guys have any setups that you are using and your having fun with please feel free to post pics and tell us (me) about them! if i forgot anything please forgive me, theres just so many things to wrap your head around when it comes to these cars. im open to any ideas.

Thanks in advanced!!

rx7fcfc

iTrader: (1)

upgrade turbos and get a boost control and better fuel pump just look it up man there lyk 1000 tread on it

xxtremes33

iTrader: (16)

first thing i would do is get standalone ecu like a apexi power pc with the s5 harness or a haltech.

speaking from personal experience with a holset turbo myself. the hx35 is going to be too small and the hx50 will be too big unless ur looking for 450+ rwhp (have a friend with a half bridge on a hx52 with max boost by 4500rpm). hx35 will probably get you to the 300rwhp mark though. hx40 with a 17cm turbine house is great for a street car. and will make around 400-425rwhp. some guys will say 19cm but to me it was a little too laggy for my street car. and when u say crazy amount of boost, anything above 18psi is pretty much too much boost for a street pump gas rotary.

i think you need a more specific goal. a more specific goal will get you a lot more information.

AmT_T

iTrader: (11)

U dont need a super afc if you are running rtek 2.1 (Its almost like a standalone) u can adjust fuel and timing maps through a palm pilot. I'm looking at picking one up myself as soon as I put the car in storage for a canadian winter.

xxtremes33

iTrader: (16)

unless im mistaken, dont they only make rtek ecus for s4 cars? i havent looked into them in forever now but last i saw they only made them for s4 cars and not s5s. but yes a rtek can do it.

Len-Len

iTrader: (9)

They make them for all FCs

LunchboxCritter

iTrader: (9)

How many miles do you currently have on your engine?

I would suggest a fresh rebuild would be a great place to start if you want reliability. I would also suggest upgrading your radiator.

I believe a Rtek 2.1, Walboro, 720cc secondaries/primaries, BNR Turbo Rebuild (Stage 1 claims 300+hp), and a wideband will get you to your goals.

SirCygnus

iTrader: (1)

not many people run that turbo, but they love it. the hx55 is a little on the big side for you and would probably suit a bridge ported motor a lot better.

microtech is a poor option. haltech has a wide range of ecus that will fit your budget and they are very rich in support and features. rewiring the car is a better option.


you will soon realize that this combo will run out of steam rather quickly.
remember, its better to subtract fuel than it is to add. so start off with some bigger injectors. start off with 800cc primary then 1600cc seccondary and add more bits to it as you go along.

its whatever fits in your budget. up to you.

SirCygnus

iTrader: (1)

as the highest hp obtained by anyone. this statement is false as around 280 is expected.

LunchboxCritter

iTrader: (9)

www.bnrsupercars.com website, "You can see anywhere from 300- 320 RWHP from the stage 1 depending on your set up and boost level."

I don't doubt that 300+ hp is probably not easily obtained with a Stage 1, but I doubt that it is impossible.

I also agree that you should buy the highest stage you can afford. The BNR upgrades are good because you keep your original manifold, exhaust, etc.

AUGieDogie

iTrader: (4)

I agree with luchboxcritter I have an 87 with the RB Rev II, the Rtec 2.1, 4x720 injectors, walbro, and a BNR stage 2. I can monitor and adjust a whole lot of things with the ECU as well as datalogging. A PLX wideband monitors AFRS.

My Boost levels are 6psi due to the porting on the BNR. Right now I have no intention of upping the boost so i don't need to upgrade the intercooler. Since you want to run more boost Definatly get a new intercooler. and if you go the BNR route you will need a boost controler.

My recomondation is.
1.Rtec the will help you rightn now. you can dial in more fuel so you don't kill your motor.
2. Walbro
3. 4x720s or you could probably do 2x550+2x720 right now. But you can add alot bigger injectors with the rtek, its very adjustable.
4.BNR. Figure what size you want at his website.
5. Intercooler
6. Boost controler.

You should probably get a wideband ASAP so you can monitor your engine an make sure it don't go boom.

Good luck

Aaron Cake

iTrader: (1)

How has someone who has researched a LOT!! not know where to begin?

Well, first you need to decide whether you want 300HP or 400HP.

At the 300HP level, you can get away with things like hybrid stock turbos and stock replacement ECUs (RTek).

At the 400HP level, you are into full turbo upgrades (and all the stuff that goes along with it...manifold, wastegate, new downpipe, big FMIC) and are firmly in standalone ECU territory.

And how many miles are on your current engine? A 200K engine won't last long at 400HP levels.

Keeping the AC and PS will require some custom plumbing on your part for intercooler pipes. You'll need to come through the top of the rad support and snake your pipes around the PS pump. Not a big deal, but also not something to forget about. Keeping the AC means retaining the BAC (which you should do anyway) so you'll need a standalone capable of controlling it with an aux input so it knows when the AC is on. This means NOT a Microtech.

TeamRuffRacing

The reason that i dont know where to begin is because theres so many different options when it comes to these cars. theres so many different combinations and variations of setups, which all have the potential to work.

Thats the confusing part. IDK where to begin!!

My final goal for the car is to make a little above 400.

im defiantly getting a front mount intercooler. i just wanted to know if you guys had any suggestions or comments about any specific type.

My main issue is the computer. i would like to get an rtek 2.1 but is that good enough? i have a autometer narrowband afr gauge and a boost controller.

i dont want a BNR turbo. i feel as if the boost wont come in as hard as a Holset turbo.

AUGieDogie

iTrader: (4)

There is lots of good info in the Rtek section of the forum. Alot of people have been using injectors that are larger then the 720 max preset. You can adjust the fuel around it and it runs just like stock. A quick check on rx7.com's injector calculator says you can run 4x1000 @80% for 440 at the flywheel. maybe using 1600s on the secondarys and 720s on the primaries.
Ditch the narrowband and pick up a widenband. You can read the AFRS+rps+boost right on the datalog screen of the Palmpilot. My only problem with the rtek is that it palm based and you must have an older one because the newer ones don't come with a serial port. Although some have had luck with a laptop (also no serial port on newer ones.

For the intercooler, just check out the for sale section. There are always FMICs selling. Talk to the seller and how it was installed.

I'm pretty sure you can hit your 300whp with the rtek, 400, probably. Anyway i recomend this for your starting point. If not, go with a Megasquirt or or halteck or such. Just remember you have to wire these your self, not pnp. After you get your computer you can figure out everything else.

Good luck

TurboII RudeBoy

Your from ruffracing and you don't know where to start your posts are always entertaining.go ask big moe for advice

TeamRuffRacing

thanks i actually forgot about the injector calculator. the rtek seems like a good idea for right now.

Big Moe is my dad... i have asked him what to do with my car. but i dont really like asking him without any background information on what else is running. plus suggestions never hurt right?

he wants to go t70. but i think thats to big for me because i know im going to want to turn up the boost! =) Thats when things go wrong.

I just want to build my own knowledge about possible setups that i can run.

Aaron Cake

iTrader: (1)

If you want 400HP, I personally wouldn't recommend any system which uses the stock wiring harness unless your harness is in perfect condition. The entry level Haltechs are under $1000 and will give you far better control then an RTek.

littlemimus

before you mod thecar make sure the engine is in good shape. adding parts will only compound problems if its not

just startn

iTrader: (33)

Leave it stock & read for 2 more years

AUGieDogie

iTrader: (4)

Aarons right, he always is, make sure your injector wires are in good shape. Or rewire them just to be sure.