Re: 500 EFI Power Increase
 

You said you used 0.27 head gaskets who make them and
do you have a # for them???? thanks.

Re: 500 EFI Power Increase
 

They are Cometic. Part Number C5333-027. The numbers after the dash are the thickness. When you get the head gaskets they have a totally different part #. I emailed Cometic, and they say they package different part numbers than ordered. Did not make much sense to me.

http://www.cometic.com/catalogs/AutoCat04.pdf

Re: 500 EFI Power Increase
 

THANKS redoing my 500's and thought i would check that out!!!!!!

Re: 500 EFI Power Increase
 

Got the ECU's back from Mark today. Will do a test run on Sunday.

Re: 500 EFI Power Increase
 

I know your happy about that...bring a rain suit :D

Re: 500 EFI Power Increase
 

Got back from a week in Sarasota. No problems other than the engine vapor locked on me the first day. Looking to get the mechanical fuel pumps soon.

I want to thank Mark @ Precision Marine for all his help. I sent him the ECU's three times for adjustments. He turned them around that day & got them back to me the next, THATS SERVICE!!! Every time I called him he took my call. He did not try to push me off with questions. A very nice fellow that cares about his customers. I can not say enough about his help.

The right way to do a modification like this would be to send him the motor. We got it but it took a few tries. He told me it would.

THANKS!

Top Speed trials coming next week.

Re: 500 EFI Power Increase
 

Lennie congrats on the engines. Ill try to call ya Tuesday. We should be finished Monday on mine :drink:

Rob

Re: 500 EFI Power Increase
 

Here's the first top end results.
Last year the boat ran about 5300RPM that was 88MPH.
After the upgrades, yesterday it ran 5700RPM that was 93MPH.
I was expecting more, but has usual, the result seems to match the power. Assuming the 500's had 500HP, that was 88. The 525's have about 540HP and the boat runs 91MPH. Thinking I have 575+-HP, I got 93MPH.

Here's some things I noticed. Mid Range is much better. It has much better acceleration. Getting to 5700 happened quick then it hit the wall.
Running prop slip figures my slip went from 12%at 5300 to 14% slip at 5700. The speed took a minute to catch up with the RPM. I bought a set of labbed 33P props I will try next. I think I ran the engine out of the power curve with the 30's.

After a few WOT tests, my transom was sooted very bad. Even got up on top of the swim platform. I am going to do some plug checks next test. I would say the whole fuel curve could go down about 2 jet sizes in a carb. Maybe four. It might need a little more calibration on the computers.

Not sure when the next tests will be.

I still believe the best way is to send the engines off to the dyno to get the best result. I am seriously considering this now.

Re: 500 EFI Power Increase
 

Congrats Linnie, I'm sure you'll find another 1-2 MPH. Keep me in mind if the 33's don't work.

Also, I have a set of 28 Merc labbed five blades for sale, still in box only used once.

Re: 500 EFI Power Increase
 

Talked to Mark at Precision today, He just finished another engine very similar to mine and thinks he can improve on the result. I have decided the best way is to send him one engine and let him dial it in. He will get all small issues corrected. I am removing one engine Thursday evening and shipping it to him Friday.

Other things he told me. A 500 EFI intake will not work after 5700RPM. He says it runs out of air. He said I need to run it under 5500RPM to get max power. I am planning on talking a long lunch either Wednesday or Thursday and installing the 33P Bravo 1's to see the result before I send it to him. I feel sure he can get another 20-30HP out of the engine to get the fuel curve just right.

I will post these results as soon as I get out.

I made one call to Precision today, got Mark right to the phone, He talked to me and has been following my post and knew what I had done. Thats Great as far as I am concerned!

Re: 500 EFI Power Increase
 

Linnie sounds like your real close . Did you change the cams?To what?.Yea it sounds like if ya leaned it out some and proped it up you will pick up some more .Becarefull swiming around the lab props :eek:

The prop guys are saying I might have to go up 6 pitch sizes

I am happy with Mark also and we made some good #'s I just wish I had the drives to handle all the power I made :eek:

Mark stays so bussy I dont see how he does it.There was 3 motors waiting to dyno after mine .

Re: 500 EFI Power Increase
 

I have to give it to ya Linnie, your aggressive. What is freight to Precision?

Re: 500 EFI Power Increase
 

Lennie does things first class or he doesnt do it at all!! I admire him for his goals he has set, it will all be worth it come summer.

Re: 500 EFI Power Increase
 

Here's pictures of the motors installed right before I pulled one to go to Precision Marine for Dyno Test.

Notice the Vortech flame arrestors. I think they add a nice touch.

Re: 500 EFI Power Increase
 

Here's the motor getting ready to get sealed. Trucking company will be here at 2:00 today to pick up.

On the way to Precision Marine for Dyno test and final power dial in.

I hope the trucking company can get it back just like this.

Re: 500 EFI Power Increase
 

Nice box Linnie!!
Don't forget to mark it "This Side Up" :D :D :D

Re: 500 EFI Power Increase
 

Hey Linnie dont forget your drill :D

Good luck on the dyno, Mark will take care of ya Did ya send the other computer with it?

Keep us posted


rob

Re: 500 EFI Power Increase
 

Dave, Its marked all kinds of ways. I finally got Overnight to insure it for 28K. Most every trucking company only wanted to give me $2 per lb. coverage.

Did not forget the Drill. I even sent the lifting arrangement for Mark.

Re: 500 EFI Power Increase
 

Rob,

Sent both computers, Mark said he might get to it next week if I get it to him early enough.

R U running yet? 95 with no steering could be scary.

Re: 500 EFI Power Increase
 

I'm sure it will arrive just like you sent it..... :eek:

Re: 500 EFI Power Increase
 

Russ,

That's what I am afraid of.

Re: 500 EFI Power Increase
 

Motor arrived at Precision today in one piece! Not sure of when they will be getting to it but I know they will get it soon.

Re: 500 EFI Power Increase
 

Now that the motor has safely arrived you can get a good nights sleep.

Re: 500 EFI Power Increase
 

On the Dyno Today!

Re: 500 EFI Power Increase
 

Linnie congrats on the power . Mark said it ran good !!

Lean is mean :evilb:

Now we need to put some Whipples on it :eek: :drink:

Re: 500 EFI Power Increase
 

well then.....What did you end up making? We're dying to know!!!

Re: 500 EFI Power Increase
 

I know later today. Mark is going to call with the numbers. I think Rob got the final numbers late yesterday.

Re: 500 EFI Power Increase
 

Okay Linnie,
Can we take some guesses :p

Cam 236/244 custom 114LSA .610/.632 (168741 ground on 114)
9.38:1 CR
Better qwench with .027 Cometics (who would have thought of that :drink:)
Increased head flow (substantial) with Darts
Cleaner/leaner ECM

I'm thinking that in full dress with CMIs about 575hp at 5400rpm.
Around 600 naked with street headers.
No desk top dyno guesses :rolleyes:

Sounds like fun :D
Dave

Re: 500 EFI Power Increase
 

Dave,

Pretty close, I think Mark told me 577HP @ 5300-5400. He will mail the Dyno sheets to me on Monday. He is also shipping the motor on Monday so I should see it next Friday. He said it made some real good torque numbers but as usual with the EFI intake, it runs out of air about 5500RPM.

I will post numbers as soon as I get them.

No Whipples yet Rob, I need to get the rpm's down to 5300-5400 and see how it does.

If I can get it over 95MPH GPS daily, I'm satisfied.

Re: 500 EFI Power Increase
 

Just wanted to ask Lotti if my exhaust looked good in its new spot since he saw alot of it today. Maybe Linster can hook you up!!!!! :drink: :drink:











All in fun!!!!! :D

Re: 500 EFI Power Increase
 

Ouch that hurt :drink: :drink:


Linnie you going to get it running this weekend ?? :drink:

Rob

Re: 500 EFI Power Increase
 

I hope to having it back running this weekend. I am in the middle of installing Air Conditioning in the boat. I hope to get all finished and the motor back in by Sunday. The race is in town & I'm going Saturday afternoon/night.

Depends on how many soda's are at the race.

Re: 500 EFI Power Increase
 

james enjoy it while it last!!!!!!

Re: 500 EFI Power Increase
 

Home Boy Specials on the way.

Re: 500 EFI Power Increase
 

Mark shipped out the motor today, Should be here by Thrusday.

Re: 500 EFI Power Increase
 

GOT WHIPPLES????????

YOUR GONNA NEED-EM!!!!!! :eek: :drink:

Re: 500 EFI Power Increase
 

Mike he is just jealous because your boat had all the ladys on it.

Terry

Re: 500 EFI Power Increase
 

don't think I'll need whipples, remember my motors are stock tired 500's not freshly worked 500's with higher comp., worked heads, and cam. Or maybe I just can't drive the boat yet second time out :evilb: :evilb:

Re: 500 EFI Power Increase
 

Oh, well you had your chance, I will never run you again, Get you some Home Bay Specials!!!!! I dont know what your talking about I have STOCK HP500's....... :rolleyes: :rolleyes:

Re: 500 EFI Power Increase
 

hey james I am trying to put some pictures up they are too big how do I down size them