saftysizrs

i am thinking about putting some money into my 87 turbo II this winter (wont bet getting the 1000hp vette i was looking at) and i need to know how i would pick a turbo how to find out what power it will make what intercooler and injectors and things like that i will need (i usely work with nos new to turbos) and where i could find good deals on such parts (iv been looking around and inercoolers are $500 to $1000 not for a kit but just the intercooler)

arghx

iTrader: (3)

start by reading every stickied and archived thread in the single turbo section

Aaron Cake

iTrader: (1)

The first two questions when choosing a turbo are:

1. How much power do you want to make?
2. Where do you want to make it?

saftysizrs

im looking to make 30 psi or so if i can aford it but i would like to have atleast 20 psi im going to be doing some road racing, drag racing and some drifting with it im pretty good at figuring things out and making anything i need but its always better to ask someone thats done it before and if theres anywhere to get parts for less that would be good to know

Gorilla RE

iTrader: (1)

So you want to do road racing on 30psi.....?

saftysizrs

no il have a boost controller so i can lower boost levels for road racing and everyday driving and then turn it up for drag racing or drifting

arghx

iTrader: (3)

you need to research more. 30psi on a rotary engine is not 30psi on an Evo.

Aaron Cake

iTrader: (1)

30 PSI is not a power level, it is a boost level. It is also irrelevant.

How much power do you want to make and when do you want it to come online?

DrunkenBowler

Haha...30 psi...

30 psi is different on a small turbo than on a large turbo....if you want that kind of boost pressure, i suggest a diesel turbo with the smallest exhaust housing you can find.

I want to tune my car to 25 psi on my t04z so I can make around 500 rwhp. But then again, I do not use this as a road race car or track car. It's more of a drag car.

Questions you should ask yourself....

1. What kind of power do you want ?(because you need supporting mods to do so. Do a search and you'll see it's not exactly cheap if you want large numbers)

2. When do you want the power? (i.e. I get full boost at around 3.8k on my single but some people get full boost around 4.5k)

3. What kind of budget do you have? (because single turbo setups are not cheap)

4. How many things can you aford to break if you want the large hp numbers?

5. What do you REALLY want to use the car for? (large hp numbers suck at road racing but are nice for drag and vice versa)

From what I can tell, i think you want a car with around 350 hp or so. So, do some research on items that can get you to this range.

TweakGames

iTrader: (3)

If you could afford a 1000 rwhp vett, why don't you just do something just as silly and go 4 rotor with less boost? Should cost just about the same I would assume? Would be a lot more interesting.

Aaron Cake

iTrader: (1)

Because the 1000HP Vette thing was probably a lie. And if this person can't choose a turbo based on the MASSIVE resource of this forum, then there's no hope of making a 4 rotor. A 4 rotor is a big project, believe me, I know.

TweakGames

iTrader: (3)

I was going to say something of that sort, but I didn't want to be a flamer. lol Yeah.. this thread pretty much should just die.

I can't wait to hear about this project of yours aaron! You never let me down.

saftysizrs

ok so about the vette im buying the car rolling i have the motor already its a nos motor though thats all iv ever used thats why im asking about turbos with my nos i know what a 400 shot does i read that turbos work diffrent on rotorys but there wasnt much on what the difference was or what to expect. i am getting a boost controller so i dont run near as much road racing as drag and i know to be overly fast at ether will not work for the other (suspenion wise) so im leaning a little more to the road course. as far as when i want the power the sooner i can get full boost the better again i never worked with turbos and no one around here wants to touch a rotory

DrunkenBowler

A 1000 hp vette vs a turbo rotary.....uh.....a typical single turbo rotary has about a 400 rwhp output so, I don't see a power comparison. A power junkie would choose the vette over a rotary. There are guys here with 600, 700, and 800 rwhp in their cars but then again, with enough money and time, you can do anything.

You can add nitrous to a rotary motor but most guys (including myself) steer away from this. There's no sense in wasting all the time and money building something, only to run the risk of blowing up your motor with a push of a button. I choose to blow the motor other ways lol

saftysizrs

i know the vette would be way faster int the 1/4 but i still have to get the car then bring it acrost the border and it would be strictly for going straight fast and i would like to do some road racing and drifting im still looking into the vette i just want to get some info on a new set up for the rx7

Aaron Cake

iTrader: (1)

Honestly, I don't care about the Vette. Unless it's cheVETTE with a rotary I'm not interested...

Now, please answer this one question that I've asked twice now and in instrumental to recommending a turbo:

1. How much power do you want to make?

I normally don't post in the Single Turbo forum and I'm starting to realize why.

Dudemaaanownsanrx7

iTrader: (23)

1: how much money to spend?
2: purpose of the car (sounds like you are leaning towards road race in which u need quick spool)
3: how much power do you want? this will be a combination of 1 and 2 as they all go hand in hand.

Gt35 would probably get you where you want to be, but being BB is more expensive. So 1 needs answered.

fuel pump, injectors, FPR, ECU, exhaust, intercooler, ignition amp, tuning will all need to be added if your looking for 400+ hp

at < 350 hp some of those things can be omitted or done cheaper.

saftysizrs

im not sure what i can make for power i still want to be able to drive it withough it falling apart id like 500hp at max boost and il have a boost controller to lower it to drive everywhere but again i dont knwo what i can make for power without it being a trailer queen if theres any formulas that would let me know what turbo will do what so i can do some math to pick one that would be apprecated

TweakGames

iTrader: (3)

I think your way out of your league. Since you obviously won the lottery to get the money you currently think you have to waste, I recommend you just go buy something else. Maybe a 2000 hp mustang or 120 hp cavalier? You are just asking for trouble trying to have a high powered rotary car, where you are having to do all the work yourself when you know nothing about it and no one in your area will touch them.

saftysizrs

i can do the work myself i would just like to get some info on how rotorys react to different upgrades and **** as i said iv never worked on them before but i have worked on 200hp cars so i can figure it out but a little guidence would be helpful

zenofspeed

iTrader: (1)

If you really mean what you say about primarily using the car around town and Road Course, then you probably don't need or want 500hp.

With a 2-rotor 1.3l motor, you really don't need more than 300whp to effectively road race. My FD dynos at 305whp at 12psi, but I turn the boost down to around 9.5 psi (maybe 275whp or so) during HPDEs because the extra kick breaks traction. I'm just not a good enough driver to use more power yet.

If you've ever been to road race events, you'd know that you see 200hp miatas passing 500hp corvettes all day long.

Getting better times at road racing is all about starting with lower horsepower numbers, perfecting your driving skills, and inching the power up once it has been identified as the limiting factor. But more often than not, the limiting factor is the DRIVER. Then SUSPENSION. Then TIRES and BRAKES.

For example, a buddy of mine drives a N/A 260hp 1995 Porsche 911. He is a successful road racer, and competes with 700hp vettes. He spent $20k on his transmission gearing, $12k on suspension work, etc. etc. The last thing he needs is a turbo.

saftysizrs

i know that i want big power for when i want it but i want big bost presure so i can turn it down when i dont need it like road racing again can someone just give me some formulas il do the math to figure out what i need

Monkman33

iTrader: (28)

For all 3 I would recommend something like 400 hp max. without the right tires, you'll never put the power to the ground anyways.

Do you want the power to peak early and drop off, or do you want a steady incline to redline? Or do you want a broad powerband?

Every setup will have its pros and cons.

My personal decision for a mixed use vehicle (autocross/road course/drag in that order of prominence) was the BNR Stage 3's ran sequential. give up a certain amount of peak power in the very high rpm range for a broader powerband that comes on quickly. Plus, they bolt up like stock twins with the capability to run 19psi. I will be aiming to not go above 17 for drag racing, and will be limiting power to around 300 for autocross and road coursing until I develop my driving abilities to use more.

Start lower and learn to drive the power before jumping to large numbers.

Something else to keep in mind: Big psi numbers usually mean bigger turbo. The larger the turbo, the longer it takes to spool, so your low range will suffer a little bit. Match your car to the use it will see most often. If you only ever hit peak boost/power 1% of the time you are driving the car, then you built a car incorrectly. If you build a car for what you are going to do with it, then the peak numbers are purely a bragging right, and the proof will be in the vehicle that serves its purpose and performs better.

We had a guy with a single turbo FD (a BIG turbo) come out to an autocross event at TCR and he did nothing but brag about his 450hp dyno run. he never had a chance to hit his sweet spot in his power curve, and when he did... he killed more cones than a bus at drivers ed.

So i reiterate... build the car for what it will see the most. Peak numbers are only cool for magazines and dyno runs... and cool factor. A usable car will be more enjoyable.

fcdrifter13

This single post makes my day.

Aaron Cake

iTrader: (1)

500HP? OK...

The GT4088R will do that power level at around 20 PSI. It's a great turbo with good response on stock or street ports. Stock ports cause a bit of lag though which is not really ideal for road racing. If you want instant response out of the turbo, go with a bridgeport and it will act like a stock HT-18.

If you want to make the power with a little less boost, there is a hybrid 40/42 called the "GT4094R". It's the 42 compressor in the 40 housing without the packaging headaches the massive 42 causes.

Keep in mind that you'll need all supporting mods. You'll want to freshen and port the engine, you'll need a full fuel system upgrade, full standalone, large FMIC, custom exhaust, clutch upgrade, tuning, appropriate gauges, tires to get it to the ground, and probably some stuff I am forgetting.

Budget between $10,000 and $15,000 for the project depending on how much work you do yourself.