Whats the ID on the throttle bodies?

Idk I'll check. Whats OEM? Tb's are my first issue.

So what re you upset about?

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I think 67.5 mm. Megan knows for sure.

2.6 ish on the front lip. 2.5 in the middle and as far as my calipers can get. 2.39 on the back lip and that's not even port matched to the manifold since that's 2.5". And as far as I can get in on the backside its 2.35".

So 2.6 to 2.5 to butterfly at probably 2.35, then 2.35 out to 2.39. These need ******* machined.

I'll PM

Yeah, the throttle body isn't exactly what I thought. I thought they would remove the butterfly and open up straight through but it looks just highly polished.

Might consider trying maxbore and see how that works out.

I knew and said that wouldn't happen. Opening and CNC would of tripled the price. Plus new butterfly plate cost. I was under the impression all would be opened as far as possible but the 1/8th the plate touches so no idle issues. The fact the rear isn't port matched to the mani ticks me off. The back and the mani can go way beyond 2.5".

the OEM TB are 60mm
mine were bored to 62.5mm

62.5mm to inch = 2.46063''




on the posted picture with those shiny polished TB ,, I doubt there was any boring at all since there is still that OEM bump at the butterfly plate

http://i39.photobucket.com/albums/e1...psc08417f6.jpg



then next ... I hope those 2 screw holding the plate are atleast torqued down with some Red Loctite !!
stacking them is always a safe bet for this stuff !!

the reason why I'm saying this is because the plate is now thinner and not much thread holding those screws...

http://i39.photobucket.com/albums/e1...ps9acb511a.jpg





the work on the lower intake manifold look quite good on those picture ;)
He seem to also have done alright with the matching of both lower & upper manifold ,, could have been better since I think the lower corner were done a bit fast...

http://i39.photobucket.com/albums/e1...ps5f5cd1ea.jpg

When are you gonna get dyno numbers?

I hate to be so pessimistic but I bet its around 5 rwhp, which honestly could be a change in weather conditions

prove me wrong though!

It should be about that 3-5whp from the intake manifold work. Because in stock form, the fitting between the 2 of them (lower and upper) isnt great !!! If you seen the pictures that was provided before. You should know.. ;)

I think the manifold work looks OK, could be better though. The throttle body work though looks like just a polishing job and no actual porting.

-Juan

Well we left it so not to mess with the idle. I wanted everything bigger but that 1/8th lip. But looks like nothing was done. Maxbore for $179 seems to CNC the whole thing plus a bigger butterfly. Looks like ill head that route as I know the plate is only 2.35 inch and the intake and manifold are 2.5". Makes no sense to bottle neck it.



They were never removed. The threads of the screws stuck into the path of air flow so they were just ground flush with the rod. No material looks to be removed on the rod.


The issue is the manifold has wiggle room. Push it right and you get a over lapping, push left and the port matching is perfect. When installed you'll have remember which way to push so it perfectly smooth.

Not sure now. I want more material removed on the upper and lower and the TB's definently need CNC with a bigger plate. Calling Maxbore Monday. I might still proceed forward, try and use these tb's, then sell them after my OEM are maxbored out. I'll call tuner Monday too to see whats up.

Then Z1's full of ****. Their ported upper only makes way more than that ;)

Maxbore are doing 179$ for each TB ? or for both ?


As far as I remember the 4x OEM TB I have has/had a full round main shaft but only flat at the head of the screws .. not where the thread are which was a full complete half round shaft...

I would be surprised if Nissan decided to make a different TB for the 370z.
http://www.the370z.com/members/megan...ure42412-a.jpg
Vs
http://i39.photobucket.com/albums/e1...ps9acb511a.jpg

I was conservative on the guessing :tup:

Are you going to port and polish the heads also? Also the lower plenum, do the new diameters line up with the head?

$99 each, $179 both.

Hmm, idk then.

Hell no! I'd never touch a vvel head. I don't know. Have to pull it off to see.

Decided to ship the Tb's to Maxbore instead of just a polish and profiling of the butterfly shaft that I got. I already have $130 into them but again I thought I was getting porting too!!

Maxbore charges $35 for profiling the butterfly shaft which I believe is for only 1 TB so I'm thinking positively on this and only looking at it as a $70 loss instead of a $130 loss since my shaft is smooth ;)

We'll see what they look like when they come back. Again right now the TB is 2.6" at the front lip and tapers to 2.35" at the butterfly plate. Then it goes back up to 2.39" at the back. This is all bad since the manifold is 2.5" so the TB needs to be at least 2.5" also!

I emailed Maxbore and he said these would go from 60mm to 65mm the whole way through with a new bigger butterfly. Hope it all works out this time!

Damn syno I didn't realize you were so close to home! How was your experience with IPS? Thought about using them for my retune but idk tuner seemed less than willing to work with me.

Who was the tuner you are thinking of? He doesn't answer phones or anything. The real tuner for nissan and subi gets a boner for every car he tunes. Posts it on his FB and OGC FB every time.

I like IPS for some of the people but I don't like in the end its a big business. They tell you love but you don't get any really. No fuzzy feelings, just a nice smile then pay me! The tuner and I have known each other since 09. I try to only talk to him about pricing, what I want, and everything else. I just wish he was back on his own at his little shop down the road.

Did you get the TB's back from Maxbore yet?

:iagree: really interested in your results

Yeah that's who it was. His name is bill I think right? Or something along those lines I'm part of the OGC page as well that's how I found about about them. I honestly though up until that point slow motion was the only tuner shop in the entirety of Ohio it seemed.

In the mail.

He made me pay and extra $19 because he says the $179 is a TB with two butterfly's. not two TB's with two butterfly's! Kinda pissed.

interested in results...sub'd!!

That sucks, it was probably due to him spending more time into them than he originally planned on. Let's hope it was for the better.

Ok TB's are in.

So front lips gone to 2.64" and tapers down into the center but now there's no more lip. The middle went to 2.51" as far as my calipers can get in from the front. 2.49" now on the back lip which now looks port matched to the manifold!!!! I might have a little sanding to do on the mani, won't know till I bolt them up. And as far as I can get in on the back side closest to the butterfly, it's now 2.48"!

So before 2.6 to 2.5 but then 2.5 down to 2.35 at the butterfly, then back up to only 2.39 at the mani.

Now 2.64 to 2.51 but only down to 2.48 at the butterfly, then to 2.49 at the mani.

I wish the new butterfly was knife edged though.

http://i39.photobucket.com/albums/e1...ps94086b1d.jpg

http://i39.photobucket.com/albums/e1...psf115a097.jpg

http://i39.photobucket.com/albums/e1...ps48a44ef5.jpg

http://i39.photobucket.com/albums/e1...ps618f738f.jpg

http://i39.photobucket.com/albums/e1...ps1d6cec99.jpg

And Megan, the screws for the plate you can tell are tightened down about 20% more then before which I can see from IPS polishing marks and Maxbore used red lock tight on them. :tup:

Looks good. Have you installed them yet?

Do you know how the dimensions of your bored tb compare to big tb from jun or mines?

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easy to do a quick search ( 20 sec top )

mine TB are 62.5mm
http://www.the370z.com/intake-exhaus...tem-mines.html

Mine's FAIRLADY Z

Not till tune time. Check out first page for what's happening.

Not sure. Don't have a spare $1600 laying around. The "big" TB off a DE is way bigger. But you'll never be able to use it on a 370 since you won't be able to bore out the manifold to the same size. The manifold will just be a big brick wall air runs into. Plus you need a new wire harnes etc etc. as for mines I doubt its much bigger. You can only go so big before you bore through the wall or weaken the wall and the hose clamp breaks the thing in two.

Appears mine is bigger then. Far as I can tell I went up 3.3mm to 63.1mm at its smallest size. Only thing different is only one side of my shaft is thinned out.

3.3mm should be interesting since I only went to 2.5mm overbore to stay safe. but some tweak were done at the same time ;)

Hope you get the same or better result that I got 2-3 years ago :tup:

Looking forward to the results. I have the Z1 ported plenum so I'm curious to see what a ported TB will do

That's going to be tough to compare me vs you.

But maybe ill sell you my oem Tb's so maxbore can port them ad you can see down there. I know Z1 likes the higher STD correction factor.

Did you get the low profile shaft and screws for $35 more from max bore?