Replaced M370 with z1 intake plenum
 

I already have uprev tune and frankly amazed at my WOT AFR in the 7at, did a few full accel in 3rd from 50-80.

Before swapping in the z1 I was right at 12.5. Car was tuned with m370. After replacing with the z1 intake manifold it is now 13.1 so it leaned out quite a bit but i also have only driven about 30 miles since the swap.

Doesnt mayter since im getting a retune on monday to account for the swap but just found that interesting so sharing.

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After you give the long term fuel trim a chance to compensate (about 30 miles city driving), it would be interesting to see if the afr on the 50-80 pull changed before you get the retune.

Why did you decided to change manifolds?

Gonna try to see but we're getting snow today and well, i tried to drive mine in the snow once once.

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Unproven but i just feel it chokes off my top end. M370 has 83k miles driven on it. I didnt care when doing 3 or 4 track days a year and not thst much extended highway driving but now thats reversed, the car will do no more trackdays and most of commute is how highway. I want that 10-15 hp back on the top end, if i can get it or add it. We will see

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10-15 hp loss? Every dyno chart I have ever seen stated it was a loss of 1-2 hp at redline. How did you come up with such high numbers?

We'll see very shortly whether my guess is correct or not. If i thought it was that little i wouldnt have spent money on the z1.

Its either money well spent or a waste of money. Whats done is done

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I researched both for quite sometime. I went with the M370 because it produced better gains throughout the entire powerband. The only negative I saw was the loss of 1 to 2 hp at Red line. Please be sure to post your findings. You have me really interested.

Your running 12.5 in the 1/4 with those mods?

My air fuel is 12.5 to one. My best 1/4 time is 12.841.

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I will have some results by this evening. 60 miles driven since swap still about .6 leaner at WOT in 3rd gear. Didnt try other gears taking it easy until retune.

It is noticeably louder past 5k i have noticed and it doesnt feel like its losing steam uptop even without the retune but that could be my brain wanting it to be the case.

Retune is a few hours away on a different dynojet at a different location and a very cold day, its currently 18 fahrenheit. Hopefully my results are SAE so i can compare to the other dyno but worst case im gonna do 3 pulls at original dyno to make a direct compare when i get back this week.

Anyway, more information to come when i get home tonight or earlier if bored.

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Just realized you're also in MD. I used to live in Pasadena. I'm now down south on the border of AA County and Calvert. Where are you going for the tune and dyno?

I'm at R/T Tuning in Montgomeryville, PA. 6 toll booth to get here, thank god i have EZ-PASS. 2 1/2 hour drive, i left at at 5am. Plus Vince had answered some of tuning questions before so i always had in my mind if i ever needed to have a re-tune for something i was going to give this shop a shot. Good reviews, etc made it a no brainer.

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That's a long ride. What tuning software is he using, Uprev?

For the 370 they can do uprev or ecutek. But yes i"ll be stocking uprev sonce thats what i already have license wise.

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I've been considering EcuTek after I get all my mods bolted on. How do you like Uprev?

No issues. Perfectly happy with uprev.

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Well good luck today. Be sure to post the results.

Exhaust leak was also discovered today. Both sides z1 headers to test pipe, one side test pipes to y-pipe. That work is being done as we speak.

Bear in mind none of these numbers means much until i get it on the dyno at AAM to compare.

Results are STD not SAE and it was 328.11, 259.72. If subtract 4% to get the SAE guess then its 315. I highly doubt i lost power but right now comparing one dyno SAE and another STD, both dynojet. I havent even driven it yet. Anyway, just wanted to update.

Next update after driving it home and getting on it a bit then i'll schedule some pulls on AAM dyno for a direct compare.

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Dyno sheet from R/T. Traffic was really a mess coming home during rush hour and this morning still havent really been able to open it long enough. So far so good as it mich more quiet with the leaks fixed

Attachment 119190

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Not bad at all. I'm also in MD and have similar mods. Here's my results with the Z1 plenum.

how is this broken down
Blue stock
Pink uprev tuned or no tune and just boltons?
Green Ecutek
Red Z1 manifold and Ecutek retune

Still waiting to get on dyno at AAM. Hopefully next week. Possible exhaust leak again, shop is checking it today around 5pm.

Anyway my last dyno about 6 months ago at AAM with the motordyne manifold was 323 SAE. I am really curious to see what it is now so its getting done as quickly as i can get it done so i can be a direct compare.

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AAM in Annapolis Junction?

Thats the one.

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I called there to talk about an Ecutek tune, they said the Master Tuner would call me back, but he never did. I guess I will have to call again.

Ever get a chance to run on the dyno again and find out the difference between the two manifolds?

Unfortunately I have not. I actually had it retuned at R/T tuning so it wasnt the same dyno so its not a real good comparison but for what its wort R/T was STD at 328, AAA was 323 SAE both dynojet but since my m370 was AAM dyno i doubt this proves anything. My cars at 115k now so i dont drive it hard anymore for the most part. Still purrin'

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would have loved to see the difference. I went with the M370 manifold this summer and after the tune Id have to say the difference was jaw dropping, intake manifold with the tune was by far the biggest gain I saw next to the nitrous.

Same here.

I’m a diy’er who built my “M370” from an 350HR manifold. The difference you and I felt is documented in the Motordyne post below. The boost in power that occurs at rpm’s below the 7300 rpm shift point of the 7AT really helps 7AT performance. Also using the engine at lower revs reduces oil pump and valve train wear and tear.
http://www.the370z.com/intake-exhaus...tml#post819715