ram air and exhaust safe???

[apexgt2007]

Hey Im new to TY....and have a question. I have a 2007 apex gt and just recently put in a sno stuff rumble pack exhaust which I love. I also just bought a ram air air kit from factory backed yamaha race team....my question is that when I put the ram air on kit on...will I i be safe running the sled stock....or is it ABSOBLUTELY necessary to put a a fuel commander.....because i dont want to run the ram air and rumble pack exahust and lean it out.

Any help would be great!!!!

 

[hypertxer]

i have the hauck exhaust and the ram air kit and i put a hauck accellerator on. u may be safe but the apex is a little lean down low so i would put a fuel programer on to be safe it will help

 

[SledFreak]

It also runs better with a FC, because now it is running too lean. I would put a PowerCommander on it? Call Ulmer Racing.

 

[**sj**]

9 times out of 10 you will be fine...unless you experience a stumble down low...then you can enrichen ...see posts on adjusting previously ...but only if stumbles at takeoff..

 

[BigMac]

Yes, increasing engine air flow means you have to increase fuel flow to match. You might get away with just the rumble pack, but adding the ram air is going to put you over the top into the excessively lean range. The PowerCommander is a very slick unit, and Allen Ulmer can provide you with an excellent fuel map.

Best-case scenario, you won't realize your potential performance gains (what's the point of spending that money, then stopping $350 short of your goal?).

Worst -case scenario, you'll shorten engine life (or hatch it) from the heat from running it too lean all the time.

 

[**sj**]

I have air lid mod (ram air)and an excell which flows as much or more that that rumble pack....no lean condition...in fact still rich I believe.
this isnt like the two strokes..and no you do not need to automatically add fuel..
if any of you are old enough....think of it like when we were teenagers...flipped the lid on the air cleaner housing of our camaro or whatever and ran straight through glass packs..
less restriction of air on the in and the out didnt burn our motors down..in fact...less restriction means less heat built in and therefore extends engine life all thinkgs being equal..

 

[SharkAttak]

you shouldn't have a problem, i haven't heard of any apex blowing up cause of the ram-air and exhaust mod

 

[SledFreak]

I have air lid mod (ram air)and an excell which flows as much or more that that rumble pack....no lean condition...in fact still rich I believe.
this isnt like the two strokes..and no you do not need to automatically add fuel..
if any of you are old enough....think of it like when we were teenagers...flipped the lid on the air cleaner housing of our camaro or whatever and ran straight through glass packs..
less restriction of air on the in and the out didnt burn our motors down..in fact...less restriction means less heat built in and therefore extends engine life all thinkgs being equal..

sj, throw a Wide band on and you will see that it is very lean with those mods. Will it blow up, probably NOT, but it will run slower than stock. More air flow means more fuel and not through the whole band it's mostly bottom end to mid range is where it needs the fuel or up to 3/4 throttle.

 

[**sj**]

all I know is THIS MACHINE runs a hell of a lot better then being leaned out..

 

[scottymac]

Do they go lean if all you do is add the exhaust?

 

[TurboTime]

Do they go lean if all you do is add the exhaust?

NO

 

[BigMac]

Do they go lean if all you do is add the exhaust?

Anything that increases air flow through the engine will change the A/F ratio toward the lean side as some point in the ECU's fuel map. The question is how lean is too lean? How much more airflow is there from a given exhaust? Will it blow up, or just run poorly at some range of throttle positions? Exhaust changes are a little different, too, since they have to be tuned to some extent to prevent standing waves (reversion), so in the absence of intake changes (like a Ram-Air, for example) the airflow isn't increased that much (therefore, performance) isn't increased that much with exhaust alone).

Four stroke engines certainly will tolerate running lean a lot better than two strokes. I think it would take a VERY lean condition to hatch the engine. I have a Suzuki DR650SE thumper. That thing was so lean from the factory that the head pipe would glow cherry red after idling for a few minutes. Freaked me out, I rejetted it (Dynojet kit), but searching various websites indicated it was OK for that engine, and was Suzuki's way of addressing the new EPA regs for motorcycles.

 

[**sj**]

here are the facts as posted by al ulmer...
not the gains with air increase and exhaust WITHOUT any other additions..

this is done with an excell as you can see.

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We have not tested an exhaust on the dyno with the other combinations, we have only feild tested the setups with an Excell exhaust. I would rather quote HP slightly lower than tested and have a customer more happy with performance than claim a high number and have a customer disappointed!

Stock
6,500 - 86.2 hp
7,000 - 97.2 hp
7,500 - 103 hp
8,000 - 118 hp
8,500 - 126.9 hp
9,000 - 140.2 hp
9,500 - 143.4 hp
10,000 - 147.9 hp
10,500 - 150.9 hp
11,000 - 148 hp

Stock + CR10EK Plugs
6,500 - 88.2 hp
7,000 - 99.7 hp
7,500 - 104.3 hp
8,000 - 118 hp
8,500 - 127.2 hp
9,000 - 143.4 hp
9,500 - 145.1 hp
10,000 - 147.9 hp
10,500 - 153.1 hp
11,000 - 150.4 hp

Stock + CR10EK Plugs + MOD Air Box
6,500 - 89.7 hp
7,000 - 102.2 hp
7,500 - 105.4 hp
8,000 - 118.4 hp
8,500 - 128.8 hp
9,000 - 138.8 hp
9,500 - 146.3 hp
10,000 - 151.9 hp
10,500 - 156.2 hp
11,000 - 152.7 hp

Stock + CR10EK Plugs + MOD Air Box + PCIII + Ignition Module
6,500 - 94.4 hp
7,000 - 110.4 hp
7,500 - 109.4 hp
8,000 - 122.8 hp
8,500 - 134.1 hp
9,000 - 143.6 hp
9,500 - 148.1 hp
10,000 - 154.6 hp
10,500 - 159.9 hp
11,000 - 160.1 hp

 

[Srxspec]

Try it out and see. If you don't have a low speed hesitation or "popping" sound when you mash the throttle then you're probably ok. These sleds will accelerate harder with added fuel from a controller when you have a air box modification and aftermarket exhaust installed.

 

[kotapug]

Does it take a few miles after you do the air kit for the motor to adjust for the added air intake ?