exhaust tuner

[CUDA]

Beautiful ...

You have to give John a A+ for trying something new, a snowmobile thing from Iowa, ODBA use to have a race in Iowa because of John, he was colorful for sure. It would have been a 3200 mile trip for me so I never made it.

[LakeFever]

Would love to see some photos of what to open up and what to weld where to promax'ify an FF

[Chaz]

Buddy Its all Good!!! It was a What ever happens project. It turned out to be a Winner!!! As far as Mikey? Well after all he is a Jersey lander and occasionally trans plants to the South SMFH.

Regardless i Love the cantankerous Pain In The Arss!!! But Ill never forgive him for Fornicating one of my Blocks.

Attachment 487732

And then George Wanting to start Grinding on it!!!

Attachment 487733

Uncle BBQ ...

Mikey was tryin to work a deal .. the yellow block for a bushel of Okra ..

Daddy-O Fuller said .. I gotz the same FN boring bar and 053 table ..

I gave him a grinder that was seized up and a gritless rubber point to "adjust" the exhaust log ..

They both calmed down , once I took them to lunch ...



Crud quips :

Tuners just make money for those making them, show some real results ...

Lots of software out there ... reach in your pocket and learn ..

Is this your latest design for the Gumby boat .. ??? No welding required ..




I see your welding has gotten much better ...



Air and sharp corners don't play well together ...

Pit-cher frame corners ...



Long with no change in cross sectional area .. Idle to lower mid range torque ..



Long shallow angle .. mid to top end ...





So if a tuner change doesn't do anything at all ... why not just run without the inner can and tuner. Will be loud, can't break off .. yada - yada ..

If your lookin for a 100 mules with a tuner .. yur barkin up the wrong tree ...

However ..

[rprinzo]

I already mentioned that previously. And described what needs to be done. And it included the blocks discharge opening. The problem I now see is (correct me if I’m wrong). Your motor is already together. So no work can safely be done to the chest or discharge. That’s why I mentioned that matching the adapter plate to the tuner wouldn’t accomplish anything. Because the block is still a choke point.

your correct

so my next question now is what makes the ff so special then?

[25two.stroke]

your correct

so my next question now is what makes the ff so special then?

The fact that they have a "F" and then another "F" after that makes them a special FF, nothing more than that.

[rprinzo]

The fact that they have a "F" and then another "F" after that makes them a special FF, nothing more than that.

so its all just hype? you can do anything with any other block that can be done with it?

[25two.stroke]

so its all just hype? you can do anything with any other block that can be done with it?

Not ANY other block. The differences were laid out above and in many other threads here. Basically if you are gonna work it and put time into modding it doesn't really make a difference what you start with. Thats my opinion and many others' as well. People haev their preferences, and the blocks are different slightly, but if you are cutting or welding then anything can be done to either with similar amounts of work. If you are leaving them stock there's an argument as to which is better: again, different people prefer the different motors.
Maybe its easier to squeeze a little extra power outa an FF compared to an EE, but if you are shooting for BIG power you gotta put a lot of work in no matter what block you start with.

People got hyped over the FF somehow and tried selling them for more and saying they were better than a EE probably cause one guy with a FF outran a EE...big deal. 260s can outrun 300s if they are built right...
It was a sales pitch by FF owners to try to get more money for them, nothing more. I scrap FFs and EEs alike...they all melt down the same too

[Chaz]

[nitro_rat]

you would have to chuck the block up upside down in a mill and machine out a space for a filler block across the front of the exhaust outlet (in the water cavity area). You would have to weld in a chunk of aluminum and then mill the bottom surface flat after. Not fu€£ing up the line bore in the process could be a challenge and the front half would have to be decked together marrying the two and preventing their use with any other block or front. Just order a promax base gasket and lay it on the 200 block or plate and you'll understand where the material must be added...

[HStream1]

There are three different 2.5 200 Blocks that exist. The First was the 1991 F Block which was the first year for the 2.5. That Block came straight from the factory with a 7 petal front. It was only produced one year 1991. These are Extremely rare But well sought after. Then there are the other two blocks EE which is the Small Chest Block and the FF which is a Large Chest Block. So YES!!! There is a Difference And in taking either Block EE or FF to the next level The FF is the preferred block over the EE. In other words EE= ALOT OF WORK!!! FF = Much Less Work. The FF Block is the Preferred Block for Racers that want to Run in the Stock classes where mods by the rules are kept at a minimum. The FF 2.5 200 block and the NN 225 Pro max Block are similar in Chest configuration but the Port Timing it totally different.

So to say Its just Hype couldn't be further from the truth. They are coded for a reason because there are differences in Chest and Porting configurations. To fully understand the differences in the F, EE & FF Blocks one would need to have all three bare blocks in front of them to fully understand the differences.

A bit off topic but Its heard alot especially at the race tracks. Youll here Its a 300. Really meaning Its been Cut to 300 specs. but in reality its still a 260 thats been Modified and cut to 300 specs. But The Chest of a 260 and 300 Are totally different and a 260 can never have the same chest configuration as a Factory 300. It Can come close but thats it. Then there is Transfer/Boost Ports. They are also configured differently but Im not going to get into all of that.

If you really want to see the difference in a Factory 300 and a Cut 260 here it is.



Thats about as simple as i can put it in a Nut Shell.

so its all just hype? you can do anything with any other block that can be done with it?

[HStream1]

And as you can see there is a Significant difference in the Adapter Plates. First Picture is a 2 piece Adapter Plate for a 1997 FF Block. Second is a 1 piece Race Adapter Plate.

[LakeFever]

Great stuff Bud!! Is that one piece oval plate the same one that comes on the 225 promax?

The oval port one piece plate looks similar in width its the oval length of the holes that is where the FF two piece plate cant be ported too because it goes beyond the casting is that correct? Could probably open it up some though yeah? So not all the way to the one piece race plate size but maybe enough to support 250hp? I wouldnt imagine anyone would know just how far to go there?

[HStream1]

No The 225 Pro Max doesnt come with a 1 piece plate.

Great stuff Bud!! Is that one piece oval plate the same one that comes on the 225 promax?

The oval port one piece plate looks similar in width its the oval length of the holes that is where the FF two piece plate cant be ported too because it goes beyond the casting is that correct? Correct. Could probably open it up some though yeah? A bit. But why open it up at all unless the chest gets opened up as well. So not all the way to the one piece race plate size but maybe enough to support 250hp? I wouldnt imagine anyone would know just how far to go there?

[LakeFever]

Just when I thought I had it figured out lol. The 225 promax plate is different than the FF plate though yes? Regarding the chest I understand the choke areas must all be opened up together I should have worded that better I was posting in haste

[HStream1]

All Block exit ports are Rectangle in shape. Some are smaller some are larger. Pictured is a 260 Exit Port. The Adapter plate pictures above are of the Tuner side. The race Plate changes from a rounded corner rectangular engine side to oval Tuner side. The bass Mid Plates stay rectangle all the way through.

260 exit port One piece adapter Plate Block Side.

Just when I thought I had it figured out lol. The 225 promax plate is different than the FF plate though yes? NO Its the Same. Regarding the chest I understand the choke areas must all be opened up together I should have worded that better I was posting in haste