exhaust tuner

[HStream1]

Now Can we get back to the mans Original Question?

[nitro_rat]

Dont have the Foggiest about Sleds. But on all the Tuner testing I was involved in we didnt see any difference until RPM's were North of 7700. Thats when a HIPO Race Motor really needs to start breathing. Especially one that turns North of 10K. It was extremely interesting because you could actually hear the engine change Tone when the Tuner started working.

Face it. On a Bass Mid the Exhaust has to travel straight down, Hit a Wall and then Turn 90degs to get out. Where Unlike a Race Snout Mid allows the Gasses to escape more freely.

My old 1750 really did change tone at 7700-7800 RPMS, really screamed from there up to probably 8200 (my 8k tach was pegged). That one was stuck on a later plate with a bad mismatch and a 2.4 200 bell tuner. The original cast in tuner on the 1750's is the same length and shape as the 2.5 200/225 promax tuner. I think that the stroke has more to do with tuner length and that mercury got it right the first time. JMO, but I run stock tuners (either the square 2.5 style with the holes plugged or the 2.5 200 bell) on all my junk. Works for me...

[CUDA]

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

18 years ago a guy from up north John Lenskaw wrong spelling spent a lot of money and time building funky long tuned pipes to run a pro class in ODBA, all it did was make money for the welder.

How many RPMs do those Monty V-8s turn?

may as weld a garbage can on there same results, any outboard drag racer is over 6,000 rpm within 5 feet of crushing the peddle,
tuners are the most over rated mod.

[rprinzo]

Now Can we get back to the mans Original Question?

please

[HStream1]

"Tuners just make money for those making them" Thats Not always true if the Designer has some engineering & testing that went into its design!!

Tuners just make money for those making them, show some real results ... I can guarantee that all tuners are not the same and Show varied results on the Dyno. Of all the factory Tuners we tested the Oval Drag Tuner Made 2 More HP over the other factory Tuners. When I ceramic coated it It Made 2 additional HP over uncoated. And like i posted earlier I designed a Tuner that CHAZ Fabricated based on my drawing that went on the Dyno Ceramic coated and it made 4 more HP over all of them. And i have the data to back it up. Now Am I a firm believer in Dyno Happy Motors? NO!!! Ive seen WAY to many Dyno happy Motors get their Arss handed to them by Back Lot Motors. But were not talking motors here. Were talking Tuners. And Ill say this one last time!! Of all the Tuners we tested None started showing HP Gains till RPM's were North of 7700.

18 years ago a guy from up north John Lenskaw wrong spelling spent a lot of money and time building funky long tuned pipes to run a pro class in ODBA, all it did was make money for the welder. Its

John Lentzkow. And here is is:

How many RPMs do those Monty V-8s turn? Not as many as the V6 Mercs.

may as weld a garbage can on there same results, any outboard drag racer is over 6,000 rpm within 5 feet of crushing the peddle,
tuners are the most over rated mod.

[LakeFever]

Reminds me of Lingenfelter who said a great cam in an engine with a not so great set of heads will be a not so great engine. But a great set of heads with a not so great cam will still be a great engine. If the tuner didn't do nuthin Merc wouldn't have put the big ones on the drag motors. The choke looks from my seat to be in the exh chest and porting first but once opened up the tuner becomes more of the strangler.

So without ever putting a grinder to a Merc motor or without ever changing a tuner myself it looks to me from the info in this thread to answer the OP it sounds like its not worth doing a tuner swap unless you do the motor mods first.

[nitro_rat]

if you look at a 225/260/280 base gasket compared to a 200 you'll see that the exhaust outlet is so much bigger on the "race" block that it's almost or actually in the water of the 200. That's the choke point, not the tuner. Big tuner on a fishing block is like running 3" duals on your mom's Malibu wagon with a stock 305. A 2-1/4" system would make the same or more power because the extra flow just isn't necessary...

[tnelsmn]

My old 1750 really did change tone at 7700-7800 RPMS, really screamed from there up to probably 8200 (my 8k tach was pegged). That one was stuck on a later plate with a bad mismatch and a 2.4 200 bell tuner. The original cast in tuner on the 1750's is the same length and shape as the 2.5 200/225 promax tuner. I think that the stroke has more to do with tuner length and that mercury got it right the first time. JMO, but I run stock tuners (either the square 2.5 style with the holes plugged or the 2.5 200 bell) on all my junk. Works for me...

What was done to that old 2.0 to turn that high?

[rprinzo]

if you look at a 225/260/280 base gasket compared to a 200 you'll see that the exhaust outlet is so much bigger on the "race" block that it's almost or actually in the water of the 200. That's the choke point, not the tuner. Big tuner on a fishing block is like running 3" duals on your mom's Malibu wagon with a stock 305. A 2-1/4" system would make the same or more power because the extra flow just isn't necessary...

isnt that somewhat addressed in the ff block?

[LakeFever]

IIRC the differences between the 200efi FF block and the 225ProMax are; 5petal vs 7petal, bump in compression, computer tuning. I think thats it isn't everything else tuner/plate the same?

[nitro_rat]

isnt that somewhat addressed in the ff block?

No, it's one of those "you can't get there from here" situations. FF has the same outlet as all the other 2.5 200's. The FF chest does look look like a promax chest but the exhaust outlet chokes of 20-30 horsepower. EE is just as good with a little simple chest work.

[nitro_rat]

What was done to that old 2.0 to turn that high?

Just balanced, boyesen reeds, and 260 rod bearings. Otherwise it's a stock vertical front '79 175.

IIRC the differences between the 200efi FF block and the 225ProMax are; 5petal vs 7petal, bump in compression, computer tuning. I think thats it isn't everything else tuner/plate the same?

No, block is different, plate is different. You can't make any 200 block have the promax outlet without machining and welding. Jay Smith and I have discussed doing it but we haven't pulled the trigger yet due to the amount of welding that would be involved.

[LakeFever]

Just balanced, boyesen reeds, and 260 rod bearings. Otherwise it's a stock vertical front '79 175.



No, block is different, plate is different. You can't make any 200 block have the promax outlet without machining and welding. Jay Smith and I have discussed doing it but we haven't pulled the trigger yet due to the amount of welding that would be involved.

Learnin new things daily thanks Josh!

[rprinzo]

No, it's one of those "you can't get there from here" situations. FF has the same outlet as all the other 2.5 200's. The FF chest does look look like a promax chest but the exhaust outlet chokes of 20-30 horsepower. EE is just as good with a little simple chest work.

So why open the chest only to choke it back,cuz it would be called a promax if they didnt?

[HStream1]

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.

So why open the chest only to choke it back,cuz it would be called a promax if they didnt?