2.5L to 2.2L conversion

[glhsken]

Quote:

Originally posted by Zed Gearing will even it all out. My 15 psi 2.5 in my old sundance/A413 pulled just as well as Ben Paquins old Lancer which was a A555 2.2 running 5psi more boost than me. For sure he would pull on me above 4K, but below that the dancer would give him fits. :big grin:

LOL how many times are you below 4krpm when going at it... If I recall, Bens lancer never got below a mid 13??

[glhsken]

Quote:

Originally posted by Mr P-body With proper gearing you could realisticly put both cars in the same range. My high torq motor could be used with a smaller gear and let it run out the back door at a low rpm and still have plenty of power at the begining because of my 400 ft lbs compared to your 375 ft lbs in a light car...:big grin:

Agreed... Gears are a great equalizer... problem is, there aren't too many choices for us

Still contending, an equal built 2.2 will out haul a 2.5 from a roll....

Quote:

Originally posted by glhsken Agreed... Gears are a great equalizer... problem is, there aren't too many choices for us Still contending, an equal built 2.2 will out haul a 2.5 from a roll....

given our limeted choices of gears then, the 2.2 has a small (~500 rpm) advantage over the 2.5 on the street w/ a 5 speed. is this correct? how much does overboaring (~0.030) affect this if at all?

[Zed]

Quote:

Originally posted by glhsken LOL how many times are you below 4krpm when going at it... If I recall, Bens lancer never got below a mid 13??

Ken I realize that you are all-knowing about everything. That being said, my auto shifted at 4700 at WOT, dropping rpms into to high 3's.

[glhsken]

Look at some dyno plots... 500 rpm for a stock car.. grow that a few hundred for a well built 2.2.

Overbore has a negligible effect. My preference is still:

5 sp... go 2.2
Heavier auto (>2700lbs) go 2.5L
Lighter Auto, go 2.2L

I watched a 2.2 rap out 419 ft lbs at 4300 rpm. The torque difference is not great enough to overcome the better power band.

[Zed]

Quote:

Originally posted by glhsken If I recall, Bens lancer never got below a mid 13??

Maybe if he ran a 2.5 in it he would of :P

[glhsken]

Quote:

Originally posted by Zed Ken I realize that you are all-knowing about everything. That being said, my auto shifted at 4700 at WOT, dropping rpms into to high 3's.

LOL... if you say so.

I've worked on and tuned both motors. I've presented cases for BOTH motors...

Thanks for the compliment "thumbs up

[OmniSRT4]

[quote]Originally posted by glhsken
[b]Street and strip are 2 different animals... Slicks are a great equalizer for the 2.5.

Even with slicks, a 2.5 with a 5 speed doesnt work well with a fwd car. In low gear when still at low speed you will blow the tires away.

Quote:

The higher revving 2.2 will win if built equally.

Thats highly debateable. I prefer the 2.2 myself. I just prefer the way it drives. Yet, I will NOT claim it is a better choice and there isnt any proof of this.

[OmniSRT4]

Quote:

Originally posted by Zed Ken I realize that you are all-knowing about everything. That being said, my auto shifted at 4700 at WOT, dropping rpms into to high 3's.

If you're shifting at 4700, you're wasting valueable acceleration potential.

Even with a 2.5 you should still be shifting in the 5500-6000 range.

[OmniSRT4]

Quote:

Originally posted by glhsken [Look at some dyno plots... 500 rpm for a stock car.. grow that a few hundred for a well built 2.2.

You can also grow the 2.5 a few hundred right along with the 2.2 keeping the gap about the same.

Quote:

I watched a 2.2 rap out 419 ft lbs at 4300 rpm. The torque difference is not great enough to overcome the better power band.

Unfortunately, there is no hard evidence to prove this.

[OmniSRT4]

Quote:

Originally posted by gudbjartsson given our limeted choices of gears then, the 2.2 has a small (~500 rpm) advantage over the 2.5 on the street w/ a 5 speed. is this correct? how much does overboaring (~0.030) affect this if at all?

It has an rpm advantage but has a torque disadvantage. There is no clear "winner" here and its all in how you build it.

Overboring has no effect at all on max RPM. Stroke is the only major limiter to RPM as it controls piston speed.

Rod ratio plays a part as well because it effects piston acceleration.

[OmniSRT4]

Quote:

I watched a 2.2 rap out 419 ft lbs at 4300 rpm. The torque difference is not great enough to overcome the better power band.

Well on that note, 4sfed's 16V 2.2 has put down way more than that at the wheels. (high 4's, I dont rem the exact number)

Its not an issue of the 2.2 not producing ENOUGH torque.

[glhsken]

Quote:

Originally posted by Akuma If you're shifting at 4700, you're wasting valueable acceleration potential. Even with a 2.5 you should still be shifting in the 5500-6000 range.

You are way off base... 5000-5200 max for the majority of the 2.5's out there.

[Zed]

Quote:

Originally posted by glhsken You are way off base... 5000-5200 max for the majority of the 2.5's out there.

fastest times were shifting at 4700. Holding shifts to 6000 resulted in an extra 8 tenths in the quarter.

[glhsken]

Quote:

Originally posted by Zed fastest times were shifting at 4700. Holding shifts to 6000 resulted in an extra 8 tenths in the quarter.

Shifting my 2.2 below 5600 resulted in 2-3 tenths quicker e.t's (mostly stock car)