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AP1 or AP2 engine for racing

Old Apr 17, 2013 | 10:25 AM
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Default AP1 or AP2 engine for racing

What would you prefer?

We don't get the 2.2 in the UK, but I'm guessing the same power but more torque is going to work better as a race engine for getting pull out of corners?
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Old Apr 17, 2013 | 10:36 AM
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2.2
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Old Apr 17, 2013 | 11:14 AM
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Originally Posted by Sebring AP1
2.2

because...
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Old Apr 17, 2013 | 11:22 AM
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Originally Posted by thanasis11
Originally Posted by Sebring AP1' timestamp='1366223793' post='22480397
2.2

because...

You don't really need to think about this do you?

more power/moretorque/morereliable
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Old Apr 17, 2013 | 11:32 AM
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F22 is just a better all around motor. Makes peak power to 8400rpm stock out of the box and more if you force feed it, taking the factory F20 8900rpm willfully. Produces more hp and trq per rpm and has refined bottom and top end internals which have improved reliability at the limit. I cant think of anything better about running a F20.
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Old Apr 17, 2013 | 12:46 PM
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I've run both in my race car now and there are pros and cons. The 2L requires less shifting on the two Summit Point tracks I usually drive--the engine is just plain more flexible. That extra 800 rpm in VTEC makes more difference than you would think.

The 2.2L is more reliable and has a little more torque but there are several places where I either bounce off the rev limiter or simply have to shift where I didn't need to with the 2L. Couple the 2.2L with 4.44 gears and my right arm is getting a workout compared to the stock geared 2L.

I ran a 1:40.5 on Summit Point's Shenandoah Circuit (tight technical 2 miles) with a 2L engine. I've never gone quicker than 142.0 with the 2.2L.
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Old Apr 17, 2013 | 03:14 PM
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2.2 and tune it to rev to 9ish best of both worlds

I was worried about the issues robrob mentioned but I kept the AP1 trans and rearend stock and swapped in the F22 engine running off my 01 ecu. If I did more than daily the car most of the time I would get an AEM and tune it to run a little safer I'm generally very happy with the extra displacement.

Evan
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Old Apr 17, 2013 | 05:30 PM
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I did install an AP2 ecu with the 2.2L engine and I do still run the AP1 transmission. I did run the car with the 2.2L and stock 4.10 gearing for a while and I still had a couple of extra shifts and a slower time on the Shenandoah Circuit. But the bottom line is if I had to put another engine in it I'd go with the 2.2L for the reliability but the decision is not as cut-and-dried as most think.

I do not recommend revving the 2.2L engine beyond about 8400 rpm due to the piston speed. I kept the stock 8200 rev limiter.
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Old Apr 18, 2013 | 03:09 AM
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I have the 2l with a 9500 rev limiter and a 4.44 rear-end and its great for most tracks I run.
You hit redline in 5th about 130mph so you don't need 6th on the straights.
The rear-end makes the gearing similar to the AP2 setup but the gears are longer - the car doesn't seem to pull as hard thru the rev's as a 2.2l.

I think with the stock rear-end the 2.2 would pull harder but you might run into the limiter more.
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Old Apr 18, 2013 | 03:12 AM
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Some good info here. Most peaople I speak to seem to say stick with the AP1 engine. Would be difficult picking up a 2.2 and getting it shipped to the UK. Whereas there are loads of AP1 engines around, from people driving their cars into trees
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