What do we know about the z1 lower intake manifold?

Mysilverz

This last pictures are for anyone having trouble visualizing the plenum and lower manifold actually connected as they will be installed in the car.

turtle64b

Just ordered my upper and lower intake plenum and ported runners. They're waiting on cores to build them for me and they said mid-next week I should get them. Hopefully I can get these last cat bolts off, test pipes on and my crank and alternator pulleys swapped out before then haha. I'm definitely looking forward to hearing your experience putting them on! And hurry and ship your cores back!!! Haha

Mysilverz

Well if nothing else I'm sending my cores back Monday. I'll keep everyone posted on the dyno results.

Mysilverz

So I wasn't able to install the lower intake manifold Sunday. I was unsure about how to remove the fuel rail and since I was by myself without another car I decided to wait till this next Sunday to finish the install. I did however go ahead and install the ported plenum. I'm going to try to do a dyno run tonight after work, like 10-11pm central time, and see what the difference is with just this mod then install the lower manifold. I have to say based on feel from driving, I know that's incredible inaccurate, the difference is similar to when I installed the stillen gen 3 intake. Mid to high rpm the car seems to be pulling harder to redline. Also I noticed more traction issues going from 1st gear to second and from second to third.

ajcool2

Any dyno numbers?

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09 Touring 12.33@113mph 338whp

turtle64b

I'm heading down to Z1 on the 20th for a tune. I didn't do a base run, which makes my numbers much less useful, I do apologize for that but hopefully some extrapolation can give an idea of the gains to be had.

Mysilverz

Yes but for now I'm leaving it at inconclusive. Somehow I've lost a lot of power after these mods and a tune. I'm working with my tuner and Z1 to try to track down the problem. I'm swapping a stock manifold and plenum on Sunday and doing a before and after dyno to see what that changes and how. While I'm doing this I'm going to go through all my work and make sure there are no vacuum leeks or anything installed incorrectly on my end before I give a full review. I don't want to make any unwarranted claims against anyone or anything till I have some more info. Your welcome to pm me if you want me to go more in depth but for now this is all I will say publicly on the subject.

njobe89

that's like that syno guy losing power on e85... weird things happen

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2 plus 2 times 2 = ? ... hint, it's not 8

Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq

Mysilverz

Yeah I reinstalled just the stock upper plenum and left the port lower manifold on. I did a before Dyno where I reset the ecu then did a run with the Z1 parts. Then we changes out the upper plenum and reset the ecu while the car was on the Dyno and did another run. I gained 5 horsepower going back to stock. So this weekend I'll do the same with the lower intake manifold. I've been speaking with Z1 who has been very helpful. Once I change the part out I'll let them know what I find. We are trying to determine if there's an issue with the plenum or something else on the car. I will keep everyone updated. I'm not in anyway speaking badly of Z1. They have been very helpful to me. Things happen and I'm not total sure it's an issue with there part yet. I just wanted to keep the community updated.

turtle64b

I might just hang on to my stock parts for a little bit until you've got a better idea of what's going on then instead of sending them back for the core charge. I'm a little worried since I don't have any before numbers to compare to...

Mysilverz

Yeah we will see what happens. Like I said I'll keep you guys updated for now.

ajcool2

Are you tuning at all after the mods?

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09 Touring 12.33@113mph 338whp

Mysilverz

I installed the plenum and lost 7whp. I assumed this was because I need a tune so I went ahead and installed the manifold as well. I went to Rob at topspeed Motorsports and had him tune the car. I was down by about 17whp when I got to him. After he tuned the car with ecutek I gained 15whp with the tune. So I was still under my original number so we swapped back the stock plenum. I reset the ecu and did two Dyno runs at operating temperature. Then we changed the plenum, we didn't even take the car off the Dyno. Brought the car back up to operating temperature and did two more runs. I gained 5whp going back to stock but haven't tuned it since. I'm going to swap back the stock lower manifold next and see what happens.

NorthStyle

Any updates?

2013nismo

I never ordered the lower because my tuner said it was a waste. I ended up making 334/267 with gen 3, FI CBE, FI test pipes, Upper plenum. Highest 370z on their dyno is 341.

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FI TDX catback with 18 resonators, FI resonated test pipes, Stillen Gen intakes, z1 plenum, Odyssey PC-680 Battery, UpRev 334/267