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What should my MAP be at idle?

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Old Jul 3, 2005 | 05:05 PM
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Default What should my MAP be at idle?
I'm getting about 70 Kpa which seems too high to me?

I have stock displacement but ported heads & intake.

Cam is 230/242 at .050 with a 112 LSA

Is my MAP sensor going bad???????

What else could cause it to be this high? I know a big cam will pull more kPa but this much?
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Old Jul 3, 2005 | 06:16 PM
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Originally Posted by RUKWKR
I'm getting about 70 Kpa which seems too high to me?

I have stock displacement but ported heads & intake.

Cam is 230/242 at .050 with a 112 LSA

Is my MAP sensor going bad???????

What else could cause it to be this high? I know a big cam will pull more kPa but this much?
I have a 242/252 cam and my MAP sensor reads about 20 In/Mercury, which is almost exactly 70Kpa, so I would say your MAP sensor is reading fine.
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Old Jul 3, 2005 | 07:37 PM
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224/230 605/622 112, and my MAP KPa at idle is 58-60. It definately took a little tuning to lean it out at idle, with these MAP readings. Stock was 32-33 KPa.
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Old Jul 3, 2005 | 07:52 PM
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Your ok, it sounds like you have a auto and you have some tuning left, but your not too far off now.
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Old Jul 4, 2005 | 04:18 PM
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Originally Posted by RUKWKR
I'm getting about 70 Kpa which seems too high to me?

I have stock displacement but ported heads & intake.

Cam is 230/242 at .050 with a 112 LSA

Is my MAP sensor going bad???????

What else could cause it to be this high? I know a big cam will pull more kPa but this much?
with your disp and cam I'd say "good job" getting to 70%, if you do put in a higher stall TQ (are you auto?), you'll find that your idle Map point will lower. I'm running a .600" lift 224/230 383 at 55-60 kpa at 900 rpm idle
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Old Jul 5, 2005 | 01:18 AM
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Originally Posted by ZD1
with your disp and cam I'd say "good job" getting to 70%, if you do put in a higher stall TQ (are you auto?), you'll find that your idle Map point will lower. I'm running a .600" lift 224/230 383 at 55-60 kpa at 900 rpm idle
I'm manual but the figure I'm quoting was with a 750 idle, it was just too low so I took it back to 925 (from my original CC 306 program). I'll log it tomorrow to see how that affects it.
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Old Jul 5, 2005 | 09:32 AM
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With the Hot Cam my MAP is around 50 at idle, 30 or so is stock.
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Old Jul 5, 2005 | 02:41 PM
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226/230 @.05 114 LSA. 35-40 map @ 800 rpm. manual trans.
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Old Jul 5, 2005 | 03:17 PM
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About 55 @ 900 rpm idle with a 219 cam.
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Old Jul 5, 2005 | 03:20 PM
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I have right at 60 with the 383 and 306 cam at a 950 RPM idle.
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Old Jul 6, 2005 | 07:42 AM
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40-45 KPA at Idle (825RPM) with 214/221 0.505 / 0.540. 355 CID.
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Old Jul 6, 2005 | 04:52 PM
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Originally Posted by FD2BLK
I have right at 60 with the 383 and 306 cam at a 950 RPM idle.
I took my idle back up to 925 and it dropped to 65 or so - so I guess that's about right.

Thanks everyone!
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