Subject	Free breathing question:
Posted by	cherry on January 26, 2012 at 4:28 PM
	This message has been viewed 397 times.
Message	Here's the scenario -- full 2.5" intake (including through the intercoolers) + Rob'Z 62mm throttle body + full 3" exhaust. Those are all basically bolt-ons. But if they were bolted onto a car with stock cams and heads (no porting, aside from enlarging the front of the plenum to match the larger throttles), would a big chunk of that extra breathing capacity by squandered? It seems like all or mostly all of the dynos I've seen showing big gains from breather mods include bigger cams and ported heads. Has anybody seen the results to be had if the heads and cams are left stock? I imagine there are still nice gains to be had, but wonder how much (what % of potential) is left on the table if the heads remain stock. ???
Follow Ups	Free breathing question: - cherry 16:28:06 01/26/12 The earliest heavy breather dyno from Greg - CoHPhasor 16:58:16 01/26/12 Best comparison I can come up with from last year's SZ dyno - vorpalZ 17:01:43 01/26/12 91 Octane is the best you can get in Alberta? - Aqualung 17:38:11 01/26/12 no, we tuned for 91, 94 + race gas - vorpalZ 18:01:15 01/26/12 Just wait until we put the adjustable cam gears on and get - MixManMash 19:06:55 01/26/12 dialing in your cams should help out considerably (n/m) - aliaZ 05:48:15 01/27/12 Here's my before and after adjusting my cam gears. - Woody75 (Denver) 11:55:16 01/27/12 That's a very noticeable difference! - MixManMash 14:00:39 01/27/12 We actually ran out of the adjustment with the BDE gears - Woody75 (Denver) 14:18:49 01/27/12 got a set of brand new 400+s for sale (n/m) - KongZTT GT28RS MD 21:26:57 01/27/12 How could you tell the difference between the 2 - toykoz32 22:27:51 01/27/12 You cant really. - Woody75 (Denver) 22:39:01 01/27/12 PE1420 powah!!! - aliaZ 20:31:26 01/27/12 Degreed the engine to stock specs on the stand. - Woody75 (Denver) 22:35:32 01/27/12 Do you know what the final numbers were? - aliaZ 08:57:48 01/28/12 Interesting... - ttzcadet 01:22:11 01/27/12 Scales are different - 450 on the HP axis, 425 on the TQ - black300zx 07:28:14 01/27/12 Thanks, just noticed that... - ttzcadet 08:03:52 01/27/12 It drives me nuts when the HP and TQ are scaled differently. (n/m) - Rob'Z 07:20:46 01/27/12 Excellent post - Thanks! That's quite a difference - cherry 08:40:14 01/27/12 After talking to Greg, the difference is because the 500 - MixManMash 08:51:05 01/27/12 So this doesn't really answer the OP's question, since Mixma - Haasz32 13:43:45 01/27/12 We should have some comparisons after dialing in the cams - MixManMash 14:01:43 01/27/12 It does and it doesn't - vorpalZ 22:43:16 01/27/12 The person to ask is Greg D. (n/m) - CoHPhasor 18:00:33 01/28/12
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