Turbocharge Stock 3S-GE with Low Boost

[samet]

Hi Guys,

I know I know, I keep posting about turbocharging my gen1 3S-GE in my ST162, but that's coz i really really wanna do it lol.

What if I turbocharge the stock engine on low boost, like 5psi or even lower perhaps...

Do I still need to replace the ECU, and get an intercooler?

(I Know the full specifics for a proper conversion; New Fuel Pump, Low Compression Pistons, ECU, Intercooler, exhaust and manifold)
And I do know its just overall cheaper and more reliable if I just do a 3S-GTE conversion, but I'm not up 4 it just yet...

I'm after just a cheap conversion with a new manifold, running on low boost.

Please Tell me your opinions about it


btw, Cannon Exhaust tip/muffler, what are your opinions? (Rice Mod wif no Performance increase, I know I know, but still )

You all can tell i'm after a cheap performance increase/change in the feel of driving my car

[blakeg]

dw about fuel pump 162's get the gte swap frequentlyand the stock pump is ok , so will be fine for low boost.
just ecu and ic yeh dont forget oil and water lines inc a return to the sump not sure what the stock injectors are good for either. but dont be surprised when it goes pop man .

[samet]

Will it seriously go pop man even if it is on low boost Well obviously engines die and doing this just brings its life span to an end closer I guess, but still...


btw, what are safe low boost levels with the stock engine (with ecu and ic)

[LeaThaL]

you can just do the usual N/A mods (extractors, highflow exhaust, timing and plugs, leads etc etc) and get some fun outta the car and get ready to do a 3s-gte swap later.

their still a fun quick car with the proper, non-rice style breathing mods and by time you make a custom manifold for turbo, do IC, make Exhaust, Do all the custome stuff, your left with nothing....

and to be totally honnest dude, ive done the 3sgte swap on my first 184 and it was piss easy, this was way before i did anything really advanced

and ive done the usual 1jz-z20 swap it is a nightmare, i only wish it was the 3s swap! lol

with one mate that knows what their doing you can have it done in a weekend


thats just my 2c tho

[Angelmon]

You will need an intercooler and a 2 bar map sensor from a turbo Celica/mr2 or maybe even a supra one, other wise your computer will freak out when it see's boost.

Stock gen1 turbo and mani. you can t off the oil pressure sensor to get oil for the turbo there and run the oil cooler line into the turbo and back to the oil line for the water lines.

You can get a SAFC piggy back they go 4 around $350 to control the fuel.

Your compression is low 9.2:1 so you don’t have to change the pistons, its the gen 2, 3 and beams that had big comp ratios.

u will need a 3sgte oil pan or mod your stock one for the oil return line.

You should upgrade your injectors and fuel pump, I think gen1 were 250cc. you can upgrade to gen3 3sge 315cc or 7mge 315cc, but most popular are RX7 top feed high impedance injectors 550cc I think they were.

Also if you want to play it safe you should get water/alcohol injection there not to expensive and they work well.

The main problem will be that you can’t adjust you ignition timing cheaply you would have to get a full Standalone ecu not just a piggyback and it will blow your budget and im guessing your on a budget lol. But with water injection and low boost you should be ok.

I think that’s the most basic set up you can do with out blowing you engine. Maybe - water injection

Go to 6gc.net there are a lot of 5sfe Turbos to get an idea. The 3s and 5s are not the same motor but are very similar

[blakeg]

You will need an intercooler and a 2 bar map sensor from a turbo Celica/mr2 or maybe even a supra one, other wise your computer will freak out when it see's boost.

What ? its an afm and the stock ecu has no input for a map sensor

Stock gen1 turbo and mani. you can t off the oil pressure sensor to get oil for the turbo there and run the oil cooler line into the turbo and back to the oil line for the water lines.

why would he change the intake heaps of guys CHANGE to the NA ones cause they are better for cold intake temps

You can get a SAFC piggy back they go 4 around $350 to control the fuel.

i dont know about this.

Your compression is low 9.2:1 so you don’t have to change the pistons, its the gen 2, 3 and beams that had big comp ratios.

uh the NA 3s def has simular comp ratios too the gen 2 and 3 as they dont drive like dogs and can pull similar numbers

u will need a 3sgte oil pan or mod your stock one for the oil return line.

true, or he can just put a return in his current sump

You should upgrade your injectors and fuel pump, I think gen1 were 250cc. you can upgrade to gen3 3sge 315cc or 7mge 315cc, but most popular are RX7 top feed high impedance injectors 550cc I think they were

Why stock fuel pump is fine for gte swaps its going to be fine for a low boost ge
i am not sure about the injectors but a set of gen 1 or 2 gte ones would be fine

Also if you want to play it safe you should get water/alcohol injection there not to expensive and they work well.

What on a street car ? yeh watev

The main problem will be that you can’t adjust you ignition timing cheaply you would have to get a full Standalone ecu not just a piggyback and it will blow your budget and im guessing your on a budget lol. But with water injection and low boost you should be ok.

I think that’s the most basic set up you can do with out blowing you engine. Maybe - water injection

Go to 6gc.net there are a lot of 5sfe Turbos to get an idea. The 3s and 5s are not the same motor but are very similar

its a gen 1 3s, really a dime a dozen if it pop's just keep the boost looow and intercooled and see if the stock ecu handles it, make sure you have a AF guage to make sure its not going lean

[DrNick]

Sounds like you are just disagreeing for the sake of it dude. You also repeated a lot of the same stuff that the last guy said while disagreeing with him. Quality post

[Gavatron]

You will need an intercooler and a 2 bar map sensor from a turbo Celica/mr2 or maybe even a supra one, other wise your computer will freak out when it see's boost.

There is no need for an intercooler. Sure it would be nice, but it can be done without one if on a budget.

Besides the motor being AFM, if you just plug a 2 Bar sensor into a stock ECU, it doesn't magically make the ECU have maps for positive pressure. The ECU only has fuel and timing maps in it for atmospheric pressures.

u will need a 3sgte oil pan or mod your stock one for the oil return line.

true, or he can just put a return in his current sump

Did you think before typing that response?

[Angelmon]

There is no need for an intercooler. Sure it would be nice, but it can be done without one if on a budget.

Besides the motor being AFM, if you just plug a 2 Bar sensor into a stock ECU, it doesn't magically make the ECU have maps for positive pressure. The ECU only has fuel and timing maps in it for atmospheric pressures.


Did you think before typing that response?

ye but you can get a second hand intercooler for $100. or you can get a new one from ebay for $400. i just think it worth the extra $$$

O and i 4got that the gen1 had AFM's and with the 1bar map I always thought that if you add more than atmospheric pressure you would MAX out the voltage signal and the ecu will start pulling timing or go to limp home mode. So you add a 2bar so you can just add boost with out the ecu thinking that some things wrong or different??? isn’t this how a fuel cut defender works???

eg 1bar map = 0PSI @5volts
2Bar map = 14.7PSI@5volts

Or am i total wrong LOL

[Angelmon]

why would he change the intake heaps of guys CHANGE to the NA ones cause they are better for cold intake temps

i mean Stock turbo and Stock Exhaust Manifold that way he can keep the cost down and the stock one is beter than any ebay one.

uh the NA 3s def has simular comp ratios too the gen 2 and 3 as they dont drive like dogs and can pull similar numbers

Gen1 has 9.2:1 Gen2 has 10:1 Gen3 has 10.5:1 and Beam has 11:1

Why stock fuel pump is fine for gte swaps its going to be fine for a low boost ge
i am not sure about the injectors but a set of gen 1 or 2 gte ones would be fine

not when the turbo ones are SIDE FEED and low impedance. and NA are high impedance TOP FEED thats why i recon the rx7 is the best chose you can also use 7mgte injector there top feed but the only problem is there low impedance so they have to be rewired.

[Angelmon]

What on a street car ? yeh watev

whats wrong with water injection http://www.aempower.com/ViewCategory...CategoryID=120 $370 US so like 500Bucks aussie. like 90% of the high hores power mr2 run meth/water its nothing crazy u can run it on the street NP

[Gavatron]

ye but you can get a second hand intercooler for $100. or you can get a new one from ebay for $400. i just think it worth the extra $$$

O and i 4got that the gen1 had AFM's and with the 1bar map I always thought that if you add more than atmospheric pressure you would MAX out the voltage signal and the ecu will start pulling timing or go to limp home mode. So you add a 2bar so you can just add boost with out the ecu thinking that some things wrong or different??? isn’t this how a fuel cut defender works???

eg 1bar map = 0PSI @5volts
2Bar map = 14.7PSI@5volts

Or am i total wrong LOL

If you put the 2 Bar on, the ECU still thinks that 5v is 100kpa/atmospheric pressure. So when the 2 bar is outputting say 2.5V @ 100kpa, the ECU is going to think it is in a vacuum.

[samet]

Your compression is low 9.2:1 so you don’t have to change the pistons, its the gen 2, 3 and beams that had big comp ratios

Is this fairdinkum?

Also, ECU replacement should be cheap guys, so Don't fight bout that... There are heaps of 3S-GTE ECU's on ebay, but gen1's are rare I think...

[Angelmon]

If you put the 2 Bar on, the ECU still thinks that 5v is 100kpa/atmospheric pressure. So when the 2 bar is outputting say 2.5V @ 100kpa, the ECU is going to think it is in a vacuum.

Yeah isn’t that want you want to achieve tho. I don’t know if you agreeing or disagreeing with me LOL

But since gen1s don’t have map sensor lets just 4get about it. Or I should make a new Thread descising Map sensor on turbo charged NA engines LOL

[jonathan yee]

well your gonna be putting more strain on an already aging engine. so i'd give it the best possible chance of surviving by intercooler. even the little st165 cooler should be ok for low boost. and some piggy back ecu.

added with water/meth inj is prob a bit exy and if you had the money for that then you should just go get a low k gen2 for under 1k and swap it in. it'd be as reliable as boosting the gen1.