amg guy

iTrader: (1)

How many guys are running a 180 or larger pulley without injectors or fuel rail upgrades.

GT-ER

I did it for a while. My injectors were 100% maxed out after 5,500rpm so I decided to buy $700 worth of injectors instead of $7000 worth of engine.

zneB-sedecreM

Do the Eurocharged injectors work fine?

GT-ER

Perfectly.

RedBullJnky

Yes they do. And I have a 185 on mine.

chiromikey

i ran a 180 with a good stage 4 set-up and kleemann tune for over 100k miles and more 1/4mile runs than most people on this board put together with zero problems.

E55Bullet

I've ran for 2 years now. Maybe we are lucky, maybe we have good tunes, or maybe we are not useing all the power we could be by not having larger injectors and a fuel rail

amg guy

iTrader: (1)

That was what I was wondering. I'm thinking with anything 180 or larger injectors are a wise choice

zneB-sedecreM

Sweet

motorkas

I also think it has to do with HOW someone is driving with that set up...I may be off base but most of the engine popping threads I've seen have to to do with WOT runs on the street at about 140....haven't seen one about the engine going at the track....maybe it's because you have to shut down around 125 and that saves you...personally, if I didn't need my license to work I'd get the injectors and fuel rail even with the small pulley because God knows I'd be doing my Scottie impression as often as I could "I'm giving her all she's got Captain".....

BBBSS

I think as someone else mentioned the motors pop on those high speed runs as they hold high RPM longer and the fuel pressure just drops and drops till kaboom.

jmb614

I'm sure deep 3rd gear pulls in 30F weather on a tune meant for the summer doesn't help either. Datalog your engine properly so you know what's going on. Just my 2 copper.

urbamworm

Let's all be clear though in case it isn't realized by some out there who may get the wrong impression. With any bigger injectors you will need a new tune for the injectors since they will need to be scaled. So yes they work perfectly but not by just swapping them in.

GT-ER

This is correct.

BlkE55K

Is there that much of a difference between the 180s and my 172? My car has had the 172 setup for a while without problems. Not sure how many 140 runs the previous owner did, but I've only run up to 135 or so once.

urbamworm

I don't think it necessarily matters on pulley size, it is more of a combination of parts and/or how the car is tuned. A car could have a 180 pulley, headers, big throttle body, etc then have a weak tune with 10 degrees of peak timing and not make "that much" power and could be just as safe as running say a car with only headers on it and nothing else.

The majority of the people on here who are modded up all have basically the same mods but power numbers from dyno graphs shown range a good 60-80whp. Now of course different dynos are going to show different numbers, but also how the car was tuned can affect things quite a bit. So don't look at just a magical "180 pulley" being a make or break item of if your car will last or not. Sure the bigger the pulley the more heat it is going to bring which doesn't help any cause though.

GT-ER

Not necessarily, the more boost, the more fuel. A large pulley will force the injectors to go static. Low timing, which may initially save a lean engine, is a bad thing as EGT's can sky rocket. It's safER than having detonation but an issue in it's self.

Forrest Gump 9

I've been running my car with the stock fuel system for about 2 years. I don't do 130+ mph pulls though. Fastest I've ever ran my car at the track is 11.1@ 128mph.

GT-ER

Yes, many people have been running the stock fuel system without issue...but how many more popped engines will we see before people start buying injectors before larger pulleys?

Forrest Gump 9

There's a member here that had injectors and fuel rail upgrade on his car and still blow the engine. Just be sensible with your car and you'll be alright.

GT-ER

I'm sorry but that is just crazy. While the possibility of blowing an engine is always there ( tune is key ), why skimp out on injectors when the EVIDENCE is obvious. If our engines were cheap I could understand, but they are stupid expensive.

The proof is in the numbers:



For those who don't know how to calculate injector duty cycle. At 5639rpm the duty cycle is at 102%. At 6503rpm it's at 126%. 100% is static so anything over that is static as well.

BTW- who was the member that blew his engine with fuel upgrades?

GregMB

keksigma (Kaylan)

He had 15% compression loss in #8 BEFORE ever adding the looped fuel rail.... the damage had already been done from previous WOT pulls through 3rd and into 4th gear. The results of the compression test seem to be the forgotten part of that story...

The time to add the fuel upgrades is before you think you need it, not after.


-G

novae500

So lets say i get the 550EC injectors and not retune. Would my engine be in worse shape with these injectors vs not having them scaled.

GT-ER

Your engine would probably be puffing black smoke out the back and run like crap. A retune is mandatory.

novae500

Thanks for the answer. I would have to setup a remote tune the day i install the injectors... Driving 3 days with header/pulley and no tune felt like a 60s carbed camaro at idle and on the gas. After tune, it was smooth at idle and just a nice deep growl on the gas.