Whipple 700SCi Upgrade
 

Anyone have any first hand experience "GOOD & BAD" with the upgrade kit for Mercury 700 SCi and what does it involve. Did any measureable difference in performance occur with upgrade. Thanks for your input.

Do a search on this...
For both 600sci and 700sci.. basically the same engine with different cams.

Usually about 8-10 mph increase.

The Whipple upgrade is a first class product.

I love mine!

Chris

P.S. The only negative is that you are probably going to need bigger props :evilb:

had it done a little over a year ago. took the boat from a 100 mph boat in perfect conditions light fuel light load to 100 any conditions and a best speed of 109. same props, they just spin a little higher which is ok since the whipple ecm reflash raises the rev limiters

Run Time
 

How many hours of use since you had it done. No issues I take it? Thanks in advance.

you know I just really like not worring about the boat breaking it runs 105 now and I never think about anything but keeping it serviced

Turning up the boost makes me think the motors are not going to last and the NXT trans might break we are planning trips to Keys and Bahamas and dont wont to have problems

Bingo! Give that man a cookie. That's the real question about this particular upgrade. It's like putting a blower on a 525/Bravo package. The engine will probably be fine, BUT....

There is a proven method to upgrading to new trannies...takes less power to turn them too.

Please enlighten us.

Chris

My I ask what rpm you turning at 109 and what is the manifold pressure

I am sure there is a way to do anything, but this is a sweat boat, just like it is and I love it.

I am very happy with it.

I go to several runs a year and yes some people go by me also they break a lot of times and I wind up ahead of them at the end of the day.

I am just like the next guy I want to go faster, but this boat will cruse at 85 mph making
5 lb. of boost all day. I came from a Scarab 26 that was about wide open at that speed
My last boat 35 lighting was really taxing the motors to cruse 85 mph all day.

My concerns are as follows:

1.) How much re-freshing (bottom or top end) do you have to do when you turn them up

2.) Will the Trans/clutch handle it

3.) I do not want to go back to pulling motors in and out of a boat again

The new trannies set the motors forward a bit.

so thats kinda a rerig. filling in the motor mount holes in the stringers.Would that be a rear motor mount also???
:drink:
Rob

Yes, you need to install a rear motor mount on the close-coupled engine and drill new holes in the stringers along with a few other changes.

Have you changed yours out?

How much power will the NXT transmissions support?

can you post a full size pick of your avatar:drink:

I like that picture too, here you go.

Yes, I swapped my NXT transmissions for Huber 1450s. According to the Mercury Racing shop manual the NXT transmissions are rated for 800 ft lbs of torque.

I guess you would recommend doing that before doing the upgrades?

What kind of torque does the whipple 700 upgrade give you?

We did it on a 353 formula with 600s, boat now runs over 100. Very sucessful

Motors have 7.5:1 compression which is very, very low, more boost, as long as controled with the proper fuel, spark and air discharge temp out of the intercooler is actually very safe.

The hardest thing on the engines is RPM, not boost. So if you want to keep your engine close to stock hours, then you'll need bigger props if your going to constantly be running top speed. For most, they just occassionaly take it up and this has very little change on the life of the motor.

Trans and drive has proven to handle the power.

You do not need to pull the motors all the time, even in stock form, the first thing to go is going to be the valve train, followed by head gaskets, so you should rebuild these around 300-400 hours no matter what.

The 700 stage 2 gives you just over 800lbs of torque, but this can also be dialed in to whatever you want.

can you do anything to whipple charged 525s without lowering boost to help save a xr drive?

If you want less torque, we can take timing away at lower speeds. Torque is also dependent on how much throttle you give it so you can always give it less throttle. You only reach peak torque when your full throttle.

Dustin:
I think I had it told to me there were some tweaks and upgrades to the ECM program since I had mine done a year ago. Is this the case?