spimp

i was talking to a rotary tuner out in Texas and was told that the easiest way to get this hp without doing any other mods is to put 750 injectors into the primary spot and this won't hurt the car. how is this possible i thougt that this would flood the car right? anyone with some experience with this that can give input i'd appreciate it!

adrock3217

Uh, if the car is NA, this will screw you up hardcore. Unless you have some SERIOUS internal engine porting (bridge, j-bridge, PP port) you don't need anything more than stock NA injectors.

If the car is a T2, again, without any mods you don't need anything more then stock injectors. And btw, fuel injectors are not there to "give a 15-20 hp increase", they are there to supply enough fuel to you're existing mods so you don't blow you're engine.

kontakt

If it's a turbo... and you have a free flowing exhaust, it'll help you get the last 15-20hp out of the boost increase... other than that, well you could probably shoot some good fireballs if you don't have a cat.

BinaryRotary

Your 'tuner' is a 'fuckwad'.

kontakt

Brilliantly stated.

SonicRaT

iTrader: (6)

Amen to that... There are WAY too many people calling themselves rotary tuners who don't know a damn thing about what they're doing.

(And, his profile says it's a TII, but 720/750's in the primary is just a bad idea)

--MAstermind--

what tuner is this i live in texas and have spoken to just about all of the local area ones.....??? i hope it was the infamous alamo rotary.....yea thats right i said it...lol

RETed

Who is this "rotary tuner out in Texas"?


-Ted

jhammons01

Gabrial Gomez???

slpin

iTrader: (9)

^^^^

spimp

hey i don't live in Texas and didn't call him my tuner. i said i spoke with him as i did a lot of tuners across the country trying to get over the install hump. and to kontakt this is what i have is a free flowing exhaust and was wondering before i tried it and blew my motor if this would actually work. and also the negatives didn't answer the question of will it flood the motor?

adrock3217

Engines flood due to poor compression. AKA p.o.s. motors, or newly rebuilt motors.

Sideways7

iTrader: (7)

It shouldnt flood it, itll just make it run rich without a fuel controller. As for the person in Texas, it sounds like something protech would say. They fucked me over bad on an attempted rebuild (after 4 months of BS I took it elsewhere) and my friends rx-7 they "tuned" runs like crap afterwards.

kontakt

Personally I'd up the secondaries to 720, not the primaries. It'll keep your idle and low RPM operation the same as it is now, but add more fuel in the top end. You should still tune it through at the very least a SAFC.

Ronald E. Jacques

You can answer most claims like this for yourself if you remember one thing: an engine is an air pump. The first and most important part of making HP is how much air can you cycle through the engine. The fuel is calculated based on how much air. Porting? more air. Cold air intake = denser, therefore more air. Turbo or S/C = way more air. So basically if anyone claims they can significantly increase your HP and it doesn't in one way or another involve more air, then its BS.

adrock3217

Untrue. You can cram a big turbo on a car, and have a bunch of power. You can also run it extremely lean..

OR, you can add bigger injectors, more fuel, and even out you're A/F ratio, resulting in more power. Nonetheless, no extra air!

But yeah, that guy in Texas should die!

RotaryEvolution

iTrader: (30)

yes you can flood even a good compression motor with 720's in the primary locations, it is less likely on good compression engines compared to lower compression engines but the fact is that without a way to control them they are overkill and they really only belong in the realm of a standalone fuel computer system with that configuration.

SonicRaT

iTrader: (6)

This coming from the Asian avatar King?

bigdv519

iTrader: (3)

"...have a bunch of power. You can also run it extremely lean..." Does this really makes sense...c'mon.


Actually, I disagree.

Example:

Car A has a stock turbo and its injectors flow only 60% of their capable flow.

Now when you "cram a big turbo" on it, the ecu will adjust those stock injectors to flow more. It might not be able to add enough, but the ecu will try. Either way there was added fuel.

Now when you add the supporting fuel mods, you increase the fuel systems ability to flow the proper amount of fuel for the added boost. Hence the added power.

But yeah, that guy in Texas should die!

Ronald E. Jacques

First of all, the original poster asked a basic question from inexperience and I gave a basic response.

Adding a big turbo sure as hell does add more air, thats the whole point, then the fuel is calculated based on the additional air. The limiting factor is how much air you can jam into the chamber. This is basic stuff here, my friend.

Your other examples are based on something already being wrong with the tuning of the car. Obviously, you can make more power if you notice half your spark plugs are missing and you replace them, and that doesn't involve more air either. AND you can make more power running extremely lean, until you burn up your motor. Even piston engines will eventually hole a piston if you run them TOO lean for TOO long. If it takes more fuel with a constant amount of air to make more power, then it wasn't getting the right amount of fuel to begin with. You can also make more power by increasing compression, or advancing the timing, up the point where you risk the same problems with detonation, but there are only so many gains to be had that way.

The point is a given engine, that is RUNNING PROPERLY will make a certain maximum amount of power, but after that any significant gains will need more air. Fuel doesn't burn without oxygen. If you can double the amount of air in a given displacement engine you can more or less double the power.

I'm really surprised somebody questioned that.

kontakt

I had an argument about this with my father that I lost. I had it in my head that air was a given, and more fuel would help push more air through. It took him a while to explain it to me, 'cause he was drunk and I was younger than 5 (I know this because the argument started over whether I was allowed to drive the boat or not, and I first drove it when I was 5). I thereby assume that the poster questioning was 5 years old.

totallimmortal

Well simply to answer the question we need to know more about your car. yes they might help if you are running lean, but then again i would think you'd want them in the secondaries instead. But if your car is not running lean now then they won't really help you unless you do something else to bring more air into the engine. It's really more simply than everyone is making it. Your asking if you need more fuel, no one on here can tell you unless they know your running lean

kontakt

but we can tell him that if he's on his stock (non re-wired) fuel system, and has an open exhaust, and no way to control boost or fuel... he's almost definitely running lean

totallimmortal

yeah but why put the bigger injectors in the primarys?

kontakt

Ohh I agree with you fully, read my earlier post, I mention that they should go in secondaries.