Crazy Plenum Update - More Sillyness Finding Power
01-22-2010, 12:57 PM
#42
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Location: Florida
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01-22-2010, 01:31 PM
#44
Wow, that is interesting... I wouldn't expect to feel much of a difference with true street tires (220+ treadwear) but I would imagine a "R" DOT tire would create enough grip for a driver like yourself to notice. That suggests the chassis is stiffer than I gave it credit for.
Last edited by Zazz93; 01-22-2010 at 04:27 PM.
01-22-2010, 04:23 PM
#45
Well, I can't REALLY say that since I haven't done a proper back to back. But next time I'm at the track I will take the bar off after a session and feel exactly how the balance changes, and of course will have some data to see if i'm right!
Ok are you guys ready for this next post?
Ok are you guys ready for this next post?
01-22-2010, 04:37 PM
#47
Ok so here it is!
I had the adapter flange machined today and welded up a little transistion from the 3.5" vband to the LS2 tb flange. My aluminum welding is finally coming along! I was really happy with how the vband flange welded up. I pre-headed the big flange a bit and it wasn't bad. Could be better though. Mounted the throttle body on and just a short section of 3.5" tubing and BPi flow stack and it was dyno time!
So this plenum made some real power! It took forever to tune the car though, because its tuned via throttle body (tps with motec m800), so as soon as you drastically change the throttle body size everything the engine references for how much air is coming in is thrown out the window. It took me 10min just to get it to run! But now it's actually idling and running surprisingly well considering the volume of the plenum and the size of the throttle body. It actually idles at 10% throttle body opening believe it or not! GM has a really neat design to let large amounts of throttle opening only open up a small amount of area for driveability.
Lots more fine tuning to do with this thing, but I'll wait until I have a firm setup before I worry about those details.
Carbotron did a great job with the plenum, I mean the guy made a part that actually fit - WELL - WITHOUT HAVING A 350Z TO TEST IT ON!!! Just a bunch of photos I sent him with a ruler. Really hard worker this dude is, I'm really impressed!!!
As soon as I got it on the dyno I had to rush a little bit, so the tune was rough around the edges, but the car made peak power of 327.1whp, about 17whp over what it baselined a few weeks ago, when it would only make 310whp even with the skunk2 spacer, even though I've made 315whp previously. The reason I think is because the engine is getting tired, its puffing a bit of smoke out of the breather now and oil builds up in the intake when it never used to !
The new intake made more power from 4000rpm up, obviously making the biggest gains up top where the restriction was the most. We recorded everything with the gopro on my head all day, and I even had the thing on my head while i ripped it around my complex just 15 minutes ago but the god damn card was full and I didn't realize. dammit. car is so needlessly fast with the cold air and no body panels! (no doors, no hood, fenders, side skirts, carbon hatch with no glass, no rear bumper!)
This engine is being abused so hard now that it's coming out soon. Revving to 8000rpm just for fun. needless abuse.
Dyno charts to follow, along with a short video
I had the adapter flange machined today and welded up a little transistion from the 3.5" vband to the LS2 tb flange. My aluminum welding is finally coming along! I was really happy with how the vband flange welded up. I pre-headed the big flange a bit and it wasn't bad. Could be better though. Mounted the throttle body on and just a short section of 3.5" tubing and BPi flow stack and it was dyno time!
So this plenum made some real power! It took forever to tune the car though, because its tuned via throttle body (tps with motec m800), so as soon as you drastically change the throttle body size everything the engine references for how much air is coming in is thrown out the window. It took me 10min just to get it to run! But now it's actually idling and running surprisingly well considering the volume of the plenum and the size of the throttle body. It actually idles at 10% throttle body opening believe it or not! GM has a really neat design to let large amounts of throttle opening only open up a small amount of area for driveability.
Lots more fine tuning to do with this thing, but I'll wait until I have a firm setup before I worry about those details.
Carbotron did a great job with the plenum, I mean the guy made a part that actually fit - WELL - WITHOUT HAVING A 350Z TO TEST IT ON!!! Just a bunch of photos I sent him with a ruler. Really hard worker this dude is, I'm really impressed!!!
As soon as I got it on the dyno I had to rush a little bit, so the tune was rough around the edges, but the car made peak power of 327.1whp, about 17whp over what it baselined a few weeks ago, when it would only make 310whp even with the skunk2 spacer, even though I've made 315whp previously. The reason I think is because the engine is getting tired, its puffing a bit of smoke out of the breather now and oil builds up in the intake when it never used to !
The new intake made more power from 4000rpm up, obviously making the biggest gains up top where the restriction was the most. We recorded everything with the gopro on my head all day, and I even had the thing on my head while i ripped it around my complex just 15 minutes ago but the god damn card was full and I didn't realize. dammit. car is so needlessly fast with the cold air and no body panels! (no doors, no hood, fenders, side skirts, carbon hatch with no glass, no rear bumper!)
This engine is being abused so hard now that it's coming out soon. Revving to 8000rpm just for fun. needless abuse.
Dyno charts to follow, along with a short video
