zoneman2

iTrader: (8)

I want to turbo my car. I heard that you dont have to replace the stock injectors up to a certain psi is that true? and if so whats the psi? If i do got to replace them i want to boost my car at around 15-20 psi what where/ what site can i find mostly all the parts for my car so i can boost it.



My cars an 88 rx7

arghx

iTrader: (3)

sell it and buy a Turbo II

87 t-66

iTrader: (133)

upgrade your injectors...theres no point in blowing a motor over something stupid. 15-20psi on the stock turbo? good luck with that.

TitosToy

you need to upgrade you whole fuel system and ecu with just only 8psi if you're turbo'ing a n/a.

Skidtron

iTrader: (1)

Like all these guys said: buy a T2

Unless you know a lot about EFI systems and their theory of operation. I may turbo my NA but I have years of experience in many types of EFI systems and a good friend that can tune the car for free when the hardware is completed. I know what I need without asking. I know how it needs to be tuned and what things are worth buying and what's not. There is not many questions I need to ask except where will I get the money and exactly how much will it cost. The answer is I don't know and a lot if you want it done right. So even without phaving to pay for someone to tune the ecu ($300-1000) I still don't think it's worth it even though I can get a S5 turbo and manifold for free. This project is not to be taken lightly. I have yet to see a properly tuned NA to turbo conversion and to see the wideband readings and ignition timing choices for one either.

Think about it. Are you in better shape as far as hook ups and of better means then I am? So should you bother or just sell your car and buy a T2?

But it's your car so do what you want but remember when your engine is broken and you can't drive your car anymore.... everyone will say I told you so.

Skidtron

iTrader: (1)

Also if you have to ask this question your not ready to do any indepth changes to your engine. Sorry man it's just the truth. I give advice all the time to my customers not that you are mine but if I answer a post I tell you as if you were my customer. Your not ready. And your wallet probably isn't either. Get ready to get nickeled and dimed to death.

zoneman2

iTrader: (8)

oo i knew you had to change them, but like i said i only heard it, if it was true then i was gonna do that. Ya i know mad ppl that can hook me up and they know alot about cars, and i got the $ and the time. I just want the car to have about 250hp in dew time i know its not goign to have 250hp in a day. But thanks for the info and input. The engines brand new so i know it can handle the boost i might even do a safe boost of 10ish 5psi to start off. I was gonna take it up to 15-20 slowly tho. but again ty for the input.

Evil Aviator

If they know a lot about cars, then why are you asking such a basic question on this forum? You are putting more faith in the opinions of a bunch of unknown internet dweebs who could be retarded 8 year old kids on crack for all you know.

Truth and logic that is sadly ignored by the people who need it the most.

While you are at it, you should try a safe speed run up to 300 mph, but 200 mph to start off.

Aaron Cake

iTrader: (1)

I run 11.8:1 to 11.5:1 at 13 PSI from my GT40R, with a max timing of about 15 degrees at full boost. About 20 degress of timing at 6 PSI and 12:1.

Skidtron

iTrader: (1)

Good stuff brother but that doesn't help the guy up at the top with all the questions. How do you have your timing split setup? progressively changing or static? Your obviously making some decent power though. Thats a generously sized turbo. What rpm do you get 13psi at? I find it interesting how much sooner the boost comes up on rotaries than on piston engines. I think I will probably use a smaller turbo for my purposes. i don't drag race.

And to the guy that made the thread I hope you know psi doesn't have anything to do with the safeness of the engine it's all about cfm. Unless your worried about lifting the head on your 13B due to exssesive boost pressure. Oh! I mean stretching the bolts that secure the housing together? Your question and comment about injector sizing and boost make no sense when there is no mention of the turbocharger. psi considerations only come into play with the map sensor your using and the ECU your using as in does the map sensor read that high and does whatever map sensor your using work with your ecu. Just letting you know. It will make more sense when you learn more about whats going on with turbos, efi systems, and what not

Aaron Cake

iTrader: (1)

15-20 PSI is a very arbitrary number and a useless measure to decide how much fuel you need. 15 PSI on the stock turbo (the smallest turbo you will want on a 13B) will be blowing more heat then air and you won't make more power then at 12 PSI. For 12 PSI on the stock turbo, 550CC primary and 720CC secondary are enough. Take my GT40R as another easy example, which put 392 HP to the ground at 13 PSI. I run 720CC primary and 1680CC secondary.

If you intend to use the stock ECU, you will need some way to control these injectors. The easiest thing is an S-AFC. Ideally you will want a full standalone.

I've not changed split from the Microtech default, whatever that is.

My engine has a small bridgeport. I will see full boost just after 3000 RPM.

HAILERS

**** You are putting more faith in the opinions of a bunch of unknown internet dweebs who could be retarded 8 year old kids on crack for all you know.
************************************************** ************

I'm 11 going on 3 and snort coke. Crack is for those headed to jail.

HAILERS

There's a fellow who sells a intake manifold for that conversion. I forget his name right now. If you don't buy a intake manifold like that fellow sells, then you have to do a bit of grinding, reshaping of a tubo intake manifold so it will fit your engine. Done.

EDIT: JAPAN2LA in this thread makes/machines the intake manifold to fit a non turbo. https://www.rx7club.com/showthread.p...NTAKE+MANIFOLD

And yes, you NEED to replace the stock injectors unless you just want to stay out of boost all together. Stock 550s are good up to 10psi.

DC13B

honestly....learn more before you undertake this...

we can all tell how much you know by you saying 15-20 psi

psi is relative. 15psi on a stock (not a good idea anyways) is nothing compared to 15psi on a larger turbo (say gt42)

for you 250 hp goal...you dont need much honestly

I have a tII, s4. Stock turbo and stock ports.
mods:
full 3" exhaust
emissions removed
rtek 2.0 ecu
Greddy fmic

guess what? i dyno'd 255whp @ ~10psi

RotaryPicha

iTrader: (2)

I got a 88 n/a. If I upgrade the injectors will that help with perfomance? Now everythings stock.

Aaron Cake

iTrader: (1)

No, No and NO! Adding more fuel does not make more power.

This is covered in the FAQ.

In addition, I'd suggest you start your own thread if you intend to ask a completely different question. That is, after checking the FAQ, of course...

Evil Aviator

If you install larger injectors on your car, it will result in much worse performance.

During acceleration, the stock computer controls the fuel injectors by opening them for a certain amount of time as determined by a pre-set table. If the fuel injectors flow more when opened, then they will inject more fuel during that pre-set time, causing the engine to run very rich. Running the engine rich will cause bogging on acceleration, increase the fuel consumption, and foul the engine.

This is why a modified computer chip, piggyback fuel computer, or standalone engine management system is required to run the larger fuel injectors.

RotaryPicha

iTrader: (2)

Thanks Evil, and my bad Aron cake.