I have been concerned about fueling for some time as it has always gone against my better judgement to increase boost and not add additional fuel volume. Yes, sure the tune can compensate and the cars runs rich, yaddda yadda, but still I have never ran a modified boosted car without bigger injectors. So when Exotic Metal started poking around at fueling I was interested. After speak with him and Jerry I decided to follow suit and order up a set of the new 550cc injectors they are now offering for myself. Jerry and Jake were a class act as always and had my ecu and injectors turned around in 1 day to Canada.

The injectors come neatly individually packed and coded with all the flow specs per injector on a data card.While not Identical to OEM injectors, they fit in replacement just fine. Two points to note, I swapped the top o-ring with the one on the stock injector because it was a little fatter and snugged into the rail better, and the the retaining clips don't quite fit right because the new injectors do not have the side reliefs cut in for the clips to fit. This really isn't a problem because once the rail is bolted down they are not going anywhere.

Install was straight forward. Surge tanks need to come off to access the fuel rails. Besure and let the car sit for some time for the rail pressure to subside or run the car and pull the fuel pump fuse and let it die. Else when you undo the fuel line you are going to get a gusher of fuel. Be sure and have a rag handy to soak up as it comes out. The inject wire clips are a little tricky but take your time and do not force them. Once all wires are undone, the rail and injectors will come right out. Drain the remaining fuel from the line and flip it upside down to pull the retaining clips and swap the injectors. The injectors feel pretty tight in there, but pull up and they will eventually come out. Reinstall along with you new ECU tune and off you go.

REVIEW:

I installed the new injectors along with new spark plugs and new EC tune on my ecu. While I was at it I shaft ported the Stock TB and ported my surge tanks and painted them black. Took my time over 2 days and I am very happy with the results. As a side note when I meet the ******* that decided 16 plugs was required I am going to punch him in the nuts. What a pain in the *** to change those!

Car fired right up and immediately It felt different. I could really hear the new airflow difference from the porting, and reved much more freely. I let it warm up for a few minutes, then back her out the driveway. Got underway and just barely leaned into the throttle an tires broke loose. Really not even trying to do anything. Found an appropriate road and got on it. First gear, useless. Second gear, useless. 3rd tires spinnging at 50. Got on the highway and gave it a few kickdown pulls. A normal 2-3 second blast that normally got the car from 100kph to 150kph pre porting, injectors and tune was now pulling to 170khp. Litterally a 3 second kickdown almost doubles your speed. I'll dyno soon, but based on comparison to other mods done so far I would guess a 40 whp pickup at least. And best of all I don't have this nagging feeling like I am going to run out of fuel and grenade my uber expensive motor. That alone would have been worth the money, but honestly the power pickup has made this car obscenely fast.

Thanks again to Jerry and Jake at EC for raising the bar again, and offering another great product.

Pete

 

Ditto! Well said..Have right at 2K on my set now..

 

Out of curiosity, how would you gain 40 rwhp with injectors unless your car was running out of fuel and didn't allow you to go full throttle? I'm definitely not bashing but I would like to know where the power came from.

I actually had a long talk with Jerry and he actually recommended that I stay with what I have after describing my logs and driving style to him. Not to say that I won't go with bigger injectors but I don't personally see any gains out of them except for the added comfort of knowing I'll have plenty of fuel on a high speed run. I run dual widebands in my car and my AFR's are between 11.6 - 11.9 through my entire 3rd gear with zero spikes. My thing is the 1/4 mile and to be honest I don't have roads or air strips that will allow me to exceed speeds over 170.

Thanks for the full review and your input and thoughts are appreciated.

 

Curious if #8 was a 600cc injector?

 

Should the #8 cylinder be larger? I would be scared of running too rich if this was the case. I'm not sure if each individual cylinder could be tuned but if this was the case I would think a wideband for each cylinder would be necessary.

 

Per my thread below, Eurocharged states they used a larger injector for #8. So far, things tend to lean toward#8 not receiving enough fuel as it is the last on the rail. Detonation perhaps. Just hate to see my #8 go up in pieces.

https://mbworld.org/forums/4243220-post11.html

 

well- he stated he also -- ported his surge tanks and grinded his TB --- that would give him a pretty good chunk of that 40whp butt dyno gain

 

Grinding the Throttle body shaft is not going to net you near the horsepower the OP is thinking, Neither will porting the surge tanks

 

Throttle body grind and a solid tune will give a noticeable improvement. I know just from my throttle shaft grind I felt it everywhere without a new tune.

 

Put it on a dyno, there is no real change

 

it is noticeable --- not only the butt dyno -- but you can see the traction lose too -- I would give a TB grind a +15whp gain --- it is much more noticeable than a ECU reset -- that is certain

 

Easily that.

 

I honestly believe that you guys are feeling a difference but do you realize how much a 15 rwhp gain is? Some estimate the SLR cams to give about a 15-20 rwhp gain, do you think it's comparable to the cams....no way IMO. I gained 18 rwhp going from the 78mm to 82mm TB. The dyno runs were done one day apart with very similar conditions and on the same dyno. Like I said, I'm sure the butt dyno give you something but from what I've experienced that's far from proven results.

To tell the truth, I considered doing the mod but I just couldn't get myself to hack up my Renntech TB. All though I will do it if someone could definitely show me some proven gains either on the track or dyno. I believe this mod came from Brooke and props to him for thinking outside of the box.

 

bassn_07, your up late. It's actually an old hot rodders mod. They generally refer to it as shaving and not grinding. I once read an older Vette gained 15rwhp from only this mod. Every car is different, every dyno is different, and numbers on the same dyno can change as well. Most of this know this already, but every little bit helps.

Once everything is strapped on and I have Jeremy tune it I will head out to the track. I only have 1/4 times from my portable at the moment.

 

a guy claimed +2mph on the 1/4 -- so, that is a considerable gain. and you are correct cams dont give much whp for the cost and the effort --- thus, I wouldnt waste my $$$ on that bang -

 

Too many changes at once to determine what exactly caused the perceived increase in performance. Maybe your plugs were overdue for a change, maybe you had a bad injector, maybe the new tune added timing, who knows?
Two things are certain, your MPH(116) is very low considering your mods before the changes. Second, you are now happy with the way it is running.
Thanks for sharing, enjoy it, and get her back to the track!

 

Congrats on your new found power and glad you are happy with it.

In regards to the shaft shaving/porting, I find it hard to believe it gains much power since as Alan stated he gained 18whp by going to a 4mm larger diameter TB. You think shaving the shaft really adds more power than that? I will look for another TB to play with. If I find one before friday (and it doesnt rain then) I will put this debate to rest. Run with my current unmodified 82mm and then run with a ported shaft TB (swap TB's at the track). Can't get a better comparison than that. My 60's are pretty consistent but we can just look at trap speeds to keep it fair. If anyone has a lead on a cheap 82mm TB let me know. Or even if you are willing to let me borrow one and port the shaft for you (for free).

 

Or....you could pull your tb off and grind it
Either way we would know for sure...lol.

Props to the op for sharing and I am glad he is happy with the results.
Count me as one of the skeptics re the tb, I would more likely point to new plugs/injectors as the primary reasons for the gains.

 

THrottle body swaps aren't that fast, you do have to pull the supercharger...

 

Not on his platform, he's got the Kleemann blower.

 

The point is going from a 74mm tb to an 80mm gains you 15.5% more area and that mod is worth 20hp. Profiling the throttle shaft will gain at best 3% more area (more like 2% when you include the screws) and that's NOT going to gain anywhere near 40HP. In fact it may actually cost airflow due to the screwhead profiles causing turbulence

 

An 80mm TB is not 80mm, closer to 78mm. This has been discussed in the past.

Here is some decent discussion here on it w/ some math. As you stated the 80tb will give 20hp, there you have it right there. We are claiming perhaps 15-20 which is what you also stated compared to a 80mm TB.

https://mbworld.org/forums/w211-amg/327281-74mm-tb-shaft-grinded-5mm-complement-exotic_metal55.html

NOBODY here is claiming the TB shave will net 40hp, again, your choosing what you want for arguments sake. Show me where anyone has claimed 40hp from a TB grind?

There are several variables that could have come into play as he did a few things to his car beyond just a shave. Keeping in mind the #8 cylinder which seems to be starved for fuel vs other cylinders could also possibly benefit from the additional fuel the larger injector in the kit allows, even over the remaining 7 larger injectors. I'm guessing the #8 injector is now 600cc vs 550cs for the other 7 cylinders. He also had a tune and MOST of us agree that HP/TQ can be gained from a proper tune. So why would a total of 40hp be out of the question? I'm not going to doubt the OP because I have no idea what his car was like before hand. Bad plugs, poor tune, bad #8 cylinder,etc.

If someone wants to mod their car, so be it. EVERY single person here that has done the TB mod has reported back with positive results. EVERY one of them. Every little bit helps, even if the TB shave was worth 10hp, 10 here, 10 there, it all adds up. It is worth it to some, perhaps not to others, but there is no need to knock what you have not even attempted.

There are those that believe tires/wheels will never improve handling, a dyno is not representative of mods, that more airflow does not matter, that exhaust is a waste, pulleys are not proven,etc,etc,etc,etc. There will always be those in one those camps.

Ultimately, internet tuning is one thing, at the track is where it counts.

 

You guys have all this crap wrong .. Didn`t anyone read all my fuel injector threads, TB porting threads, fuel PSI and the info I posted? I did all the testing and foot work on our fuel and injectors.. Funny, I post the info and questions a few weeks ago and noone knew anything.. Now all the sudden , after I post weeks worth of info and we got frickin experts coming out the walls..lol


PS, Really? running a 50 to 100 cc larger injector in one cylinder.. Really? Come on now..

 

Hey guys, I thinks some folks need to settle down. I am just sharing my experiencefrom my recent mods. I am not claiming any one modification gave me a 40whp increase. I am saying that by adding the following:

550 CC Imjectors
New NGK Iridium plugs with a 7 heat range
Shaft ported and ported/knife edged and blended circumference TB
Ported Surge tanks
And New EC Tune

It "feels" like 40whp pickup on the butt dyno. Any one of those factors can be adding to the current state of tune. I once changed plugs and gap on my modded TT 300ZX back in the day and picked up 18whp. Considering I have modded the car to be up 96whp and 125 wtq I know what various levels of power increase have felt like. All I know is how the car ran before and after since those mods. More specifically with the new parts and current tune, the car is a monster and it was no slouch before. The only reason it trapped 116 was because It was a 36 Degrees C at track level, and my IAT's were upper 190's by the end of the run. I ran like a monster out to half track then fell on it's face top end. I also ran with 3/4 tank and a trunk of tools, on 20" street tires so hardly well prepped for the track. If I can keep the car making the power it is now throughout the run, I have no doubt there is a low 11 in her on street tires.

Anyhow, I will dyno shortly and just received my LC1 wideband to go along with my OT2 to get some good logging as I go. Morale of the story here is I installed the new injectors, they run great and the car is making more power, safer then before so I am very happy about that.

Pete

 

PS:I actually had 3 injectors that flowed 560cc based on the data charts I received. I installed those in rail on the cyliders furthest from the feed.