Ateco 500efi upgrade
 

Has anyone tried this 600hp upgrade kit that I've seen in classifieds?

http://www.offshoreonly.com/classifi...o38686-en.html

Seems like a lot of stuff for the price if it works to bring a true 100hp.

That's a very nice price for all that is included. I have not heard of anyone using the setup, but that would really wake up a 500. Wish they had that posting last year when I rebuilt mine.

Without intake work and throttle body replacement, I seriously doubt you are going to see 600 hp. The intake is the limiting factor. The throttle body is not far behind.
Also, certainly not a knock against Ateco, but you can't really succesfully do a cal. for an engine with that many mods and get it 100% without tuning it. You can get it close, but every engine is different, therefore requiring a slightly different tune. It may run fine, but it will not be the best it can be. For this reason, I don't offer any "packages" or do I do any tuning through the mail.
Again, not a knock against Ateco. It's just something that I won't do. I have rarely seen it work out that good. However, it is a pretty good price on the parts.
Eddie

I was thinking the same.

Info
 

Irishtornado,

The 600 kit in classifieds is for a carb engine. The jetting of the carb will need to be motified, but we can help you with this. We have dyno sheets to substantiate.

Matt

Irish has 500EFI's.

Up to 125HP increase for your Merc 500EFI
 

We also offer a 500EFI kit. Its in the classifieds, "Up to 125HP for your Merc 500EFI"

Guarantee'd 125HP? I've seen both kit's and done lots of research. You have my attention.

We're doing something similar ( pro 1 heads, bigger cam,
asm throttle body, ecm mods)

Just got the ecm's back from getting re-tweaked, we try
them on the dyno again tomorrow...we'll see what happens.

Judging by what the air quality is suppose to be like tomorrow,
if we get 575 out of them, we'll probably do cart wheels:drink:

Our basic 500EFI kit put on a stock engine is 575HP. To get the 625HP we put new higher compression pistons, and we use a mono blade throttle body and port the plennum. If you have further questions on our packages give us a call.

Thanks
Matt

I'm at 625 with 500EFI, AFR 315 heads, cam,injectors, big throttle body and change computer. mind you when you change all of this, you need more of a fuel system as the 500 efi stock one wont handle it. Dont ask me how I know...kaboom... beware of anyone trying to tell you any different. Oh and it runs on 87 octane ;)

What did you change, larger pick-up line from tank, aeromotive pump and regulator?

from my tank was fine, but the 500efi pump once it goes into the cool fuel drops down to fitting that is less than 3/8's wide, thats what made mine lean out and blow. go to the aeromotive pump, new regulator and bigger line from the pump up, you will also need bigger injectors. Dave at MDG rigged mine so the fuel pump and regulator stayed right on the same bracket.
there is no way in hell that by doing all these mods and not changing the fuel pump and injectors that it will live long, you physically cant put that much more air in there and expect it to last.


irish, i replyed but your pm's are full :)

I cleaned it out.

Anyone tried the Edelbrock Aluminum heads? Part#61559

cookin has 502fuel inj. with them heads and dyno his motor 600hp

Boy, from all the work we have done on our 675HP package for the HP525EFI I would really like to see those dyno sheet results and build data from Cookin or whoever.
Unless you do all the things like Offshoredrillin is describing you probably are not going to see 600HP from a 500efi that will live and certainly not from a 502EFI (MPI) engine intake manifold and throttlebody!
Eddie Young knows and he has the experience to back that up too.
Just my experienced and work based two cents!

Best Regards,
Ray @ Raylar

Cookin is a mainstay on Speedwake and I see him here once in a
whille. He is not a professional like Ray but has done his own builds
and has had great success. Since I can not build my own engine I
will not doubt him. Now if Minihawk or PokerRun388 made these
claims I would have to say "Bite me". ;)

My engine started out as a 500 EFI. Bored and stroked to 540, AFR heads, Bob Maderra custom cam, stock untouched intake with the Tyler Crockett top mount throttle body kit. Aeromotive 1000 fuel pump and 55lb injectors. Assembled and dyno'd by Mark at M.E.R Performance 693hp at 6000rpm. Jeff Wurl

Why, thank you very much Ray....right back at ya.:drink:

Maybe with a 1.27 CF on good HP day. GOT SHEETS???? with all the #'s????

Yes, I have the dyno sheets from numerous pulls. Correction factor on the 693hp pull was 1.024. Jeff Wurl

Correct fuel system is a must. My new engine blew with only 19 hours running time. My fuel system was upgraded but still had low and inconsistent fuel pressure. The builder installed fuel pump was replaced and I now have consistent fuel pressure. The builder returned the fuel pump to the manufacture for testing (?) and I am waiting to hear the results.

you've been waiting 9 mos Steve :eek:

What brand was it and what is in it now?

You are not pull much over 600 HP with a stock "untouched" intake.... that is both upper and lower without magic voodoo nobody else can get. I would still like to see your sheets thats with both corrected and uncorrected numbers.

At least he called you back. :eek:

Oops! You called him! Again. And again. And again. :lolhit:

On our Raylar HP675efi upgraded HP525efi we went to 540 inches also, our CNC program and valve and spring upgrades on the stock Mercury/Edelbrock heads, bigger injectors AND serious rework and new plenum on the stock Merc Racing manifold and got to 675HP at 5600 rpms.
So with good AFR heads, and a better air delivery thru Tyler's throttle body/top manifold kit and Mark's good build, I think 693HP at the higher 6000rpm is possible, especially with the bigger cam duration it might take.
We just kinda engineered our offering for the 675HP max., we think the Bravo XR in average use can take and at 5600 rpm rev-limit where we feel the engine will live for 400-700 hours without valve train life issues. We try and build design and build for endurance not biggest HP numbers. Most performance boaters in TODAY'S economy cannot afford nor want to redo their engines every two - three years!
In any event , nice results, good job and I hope that engine runs forever!

Best Regards,
Ray @ Raylar

I can't post the sheet but it was 598hp@ 5200 and 659tq @ 3800.:coolcowboy:The heads flowed [email protected] minor porting.I have a Arizona Speed ramjet intake on it.I can look up the specs for the cam.Any questions feel free to ask.

Just a out of couriosity, and thread stealing a bit. Is there an economical way to get more Hp out of a 525 with out a major rework? My 525 dinoed in at 580, 581 and 579. this is "adjusted" data due to actual dino conditions, at 5400. Is there a way to get let's say 600 at 5400 with out going nuts?

Matt whose throttlebody and flame arrestor did you use? I have the AZ MARINE mono blade and a vortec flame arrestor that I had to make fit.:coolcowboy:My engine was dynoed with the 58mm 2 port throttle body from AZ.

Paradox, answer to your question, Nope.

Best Regards,
Ray @ Raylar

Cookin'

I hope you don't mind.

Cookin, We use the 1300CFM Monoblade from AZ Speed

I was just dynoing a customers engine. It is a 525 that was rebuilt with 10:1 compression, an AZM cam with a little more duration and 112 LSA, upgraded fuel system and Mefi 4B ECM. I was quite surprised to see it make 625 HP at 5500 RPM. I cannot find any details on headwork. The intake and TB appear stock. That's all I know about the build, I was just fine tuning it on the dyno for him.

The main thing people need to grasp with the 500 and 525 that the limiting factor to the HP of these engines is the manifold itself, like cookin did if you port match everything you may get a little more, but take off the manifold and put on a single plane and throttle body spin it to 6000 and yes you will make HP. the 500/525 intake plenums like old school TPI are designed for torque. they max out at about 5600 rpm..they make a great and reliable pkg though properly done.

Hi Bobl: Yes I believe those numbers are accurate with that type of compression and a bigger cam on the dyno. We saw similar numbers in our development and testing on the HP525efi.

Not sure if everyone will want that octane requirement and the old reversion monster tends to rear its head with the stock CMI exhaust with a bigger cam (more duration).

This is however where a HP525efi upgrade will hit the WALL for HP when it does not have serious intake manifold upgrades like our new plenum piece and some major internal porting work.

As for that dyno run posted for Cookin's engine it seems reasonable and possible they can hit that number with the described rework. The numbers show peak torque at about 3900 rpms and peak power at 5200 rpms, so the camshaft does not appear to be a large duration unit and is working well for a 600HP output PROVIDED the dyno run was with all accessories, belts, pumps etc., on and running and the dyno test was with a wet exhaust test as if it was a dry header test the actual wet or in boat power levels will fall to about 575-580HP levels.
Also if the passenger side A/F number were accurate, the passenger side of that engine is destined to grenade under a boat load! Hope it was just a dyno measurement problem and not the engines actual A/F ratio.

I think most HP500efi and HP525efi owners are trying to establish what kind of horsepower increase they can see on their engines with reasonable camshaft, head mods, injectors and intake mods and not go into their blocks, pistons, cubic inch size and such. The answer seems to be about 550HP for HP500efis, with the stock iron heads, and 600HP for HP500efi's and HP525efis with aluminum heads and reasonable camshaft sizes, mono-blade throttle bodies, good 4 tube headers and ECM tunes. These required mods are still not cheap and easy as many will see and for HP500efi owners, the added power increase (100-150HP) comes at a better HP per dollar ratio than the HP525efi (50-60HP)

If one wants to take these engines to the 675-690 HP level and stay with 9.0 to 1 compression for 89-91 octane fuel, you have got to increase the cubic inches, do serious mods to the stock heads or use aftermarket expensive heads, make serious intake manifold changes and use better camshaft profiles to get there.
Our $14,600 price tag for the HP525efi to HP675efi package is a good "Dipstick" for what an engine owner will need to spend to get into these power numbers with a reliable, non-drive busting, turnkey engine package.

Best Regards,
Ray @ Raylar

very well put and explaination Ray :drink:

How to get to whats Real??
 

As my hopeful helpful additional post on this subject I am going to make a request (plea) here.

Please all engine owners, builders, etc., lets make sure when you talk about, run and post dyno outcomes here on OSO that you make sure the tests are done at a minimum with the engine in the exact trim and state it will go into the boat with!
I realize that just a few of us can run the tests with wet exhaust systems like Bobl and some others.

When dyno tests are run and posted where the engine is in a stripped down accessory state, dry long tube dyno headers versus stock manifolds or shorty headers or aftermarket exhaust manifolds the engine will have in the boat the readers perception and indeed the actual engine owners realization of what he will end up with in the boat under real world conditions is usually very distorted and really MISLEADING!
Remember what most engine manufacturers like Mercury and Mercury Racing provide is engine power and torque numbers based on this acurrate type of actual engine configuration and use testing.
A level playing field in testing and reporting will provide the best to all readers and performance boaters who need accurate numbers to make their financial upgrade decisions on!
I know a call for honesty and transparency in these dyno test numbers in the marine performance industry is a stretch! ,but its about time we all got on the SAME PAGE!

For the benefit of OSO'ers who need accurate information on which to base spending time and money, would those who want to sit on OSO and *****hit, brag, boast, entertain, distort, bench race and mislead for new business with some reporting, please exit OSO and go to another Offshore or boat forum where honesty and transparency are a four letter words and not ethically supported!!!

Not in any way inferring anybody on this post has done this, just want to get everyone thinking about the ways to get accuracy and report same before sharing the results and outcomes with other OSO readers.

Best Regards,
Ray @ Raylar