So why is nobody talking about this?

Wouldn't you have to change the pins because we have a right side and left side TB? There is also an issue with the manifold TB inlet not being large enough, we would need a way to smooth that transition. 63 mm is as big as it's going to go on a stock ported upper.

No dyno on these guys yet?

any more info on these guys, thinking about this mod?

Well i bought Dieselg37s and got them installed. I'm trying to get something scheduled with Seb. The idle gets kinda wacky even after idle relearn. Just to much air going in at idle. But other then idle it runs with new life! My butt dyno says more mid range! Once i get over to Seb and get some numbers I'll post them.

As for those 75mm maxima throttles, I'm not sure they'd fit under the bar. And for the wiring, the eps throttles come with an adaptor harness for the one side.

Subd, can't wait for some numbers on these.

I don't think you will get a definite answer, since the variables from each car will be different. Just because the Tbs flow more doesn't necessarily translate into more power.

Agreed. Plus tunes, supporting mods, and dynos all differ. But I'm curious to see how much somebody can squeeze out of these with all of the proper pieces in place (ported upper and lower intakes and a good CAI).

I plan to start down this road after I get tuned first. I currently have everything in my signature without any tuning. So I don't want to push things into the danger zone. I'd rather play it safe and tune twice.

I have the JDM version 80mm TBs on my car. On the driver side it's plug and play. On the passenger side you need to re-wire everything.

your problem is that the car just needs more tuning. i have successfully tuned over half a dozen cars to a smooth idle using these throttle bodies. a lazy tuner will not be able to recalibrate these. you are going to have to tune the mafs. most idle troubles result from a voltage imbalance between the two mafs in the tubes. with ecutek, its easy to work around this bc it has two maf tables, without it, the tubes must be clocked. your tuner really needs to know what he is doing if he is putting on big tbs and intake tubes, or your end results arent going to be as good as they are for other people.

id also like to make it clear that EPS has a pending DESIGN AND UTILITY patent filed for these plates. Nisformance has a pending patent on their adapter harness. we teamed up to provide this kit to the community and intend to jointly defend it. anyone who is thinking about making/selling plates that bolt 70 or 75mm throttle bodies to these engines, or an adapter harness for this purpose, will in fact, be in violation of either one, or both, patents when they are finally approved. do this, and i guarantee that you will be seeing at least one of us, and our lawyers, in court.

as far as those of you asking for dynos... Z1 has done several cars with these throttle bodies already... RT Tuning just finished their highest hp stock cam car ever, using these throttle bodies in combination with the admin tuning 3" longtube intakes. CZP now has a kit and is using it on their in house 370z shop car, so expect results from them soon as well. the dynos have been done. they are available. these throttle bodies make power and give radically more throttle response than ported stock throttle bodies and radical tuning could ever begin to touch. thats all there is to it.

as far as why we didn't use a 75mm throttle body for the base kit. simple... we tested it, religiously. if tapering down to a stock bore behind it, (and lets be honest, thats most of you), there is no appreciable advantage to the 75 over the 70, especially considering the loss in throttle resolution, and added difficulty in attaining idle stability (particularly on HR cars that dont have the ability to shrink the cams and limit airflow at idle)... combined with an even more difficult packaging nightmare. while i can assure you all that there is a 75mm throttle body based product coming from eps, it will more than likely not be designed with the intention of bolting it to a stock plastic manifold, even if it CAN. hogging out the inlets of the plastic manifold to 4" and putting twin chevy 102mm tbs on it isnt the future of na vhr performance. YOUVE GOTTA CHANGE THE SHAPE/FLOW CAPACITY OF THE RUNNERS! our focus is on bringing you guys the right products that actually work, and have been documented to work, not stuff that sounds cool but doesnt do anything.

👍🏻 so do you know if EPS plans to do an upper and lower intake manifold that will work in combination with the 70mm TB's? Also, I'm not looking to rip anybody off, improperly install/tune a product that I don't know enough about, or bad mouth a product that again I don't know enough about. I, like many others, just want more performance from my Z. That being said, I know my CAI is a good match for these TB's (TB = 70mm = AAM CAI piping = 2.75") but I don't want to choke the rest of the system with the OEM upper/lower intake plenums. So if EPS isn't planning on making a kit for all of these to work together, then what would you recommend? I plan to do EcuTek as well, so that should make things a little easier for my tuner (probably going to be Dynosty, but nothing has been communicated and confirmed yet).

I already have ecutek, i just haven't gotten over to my tuner yet. Thanx for the input.

Has anybody run these with a supercharger?

bullitt ran these on his 900whp 370z, Ask him about his thought about the Tb's

Was it turbo'd or supercharged? Did they work well?

Its was turbo, no supercharged Z even come close to that power

Right, my question was about it being run on a supercharger, but that's beside the point.

I can theorize about what relieving a restriction between a compressor and intake manifold would do under positive pressure, but wanted to ask if anyone has any firsthand experience. Thanks, just curious.

There are two guys with 80mm TB with Stillen supercharger locally, both claim faster response but no dyno yet.


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I am running the true 70mm EPS throttle body setup. The units really helped with throttle response. They cleaned up my power curve and attributed to my new power gains. This is a quality upgrade and I highly recommend those going boosted get a set. Not only that but NA guys can really benefit from these throttle bodies.

Cool, thanks for your input! And based on the previous post, if someone has these on a Stillen Supercharged car, then they fit on the Stillen intake manifold (where they are mounted side by side). Good to know, thanks! I'll keep these on my radar.

I just bought some of these to add to my build. I'm excited to see the results.

I am too, can you please keep us posted I am looking at adding these but hearing conflicting things,

Please, please, PLEASE keep us posted! I would love to know what these can do for an NA build. Also, what other mods do you currently have and which tuning platform do you plan on going with, Osiris or EcuTek?

all of the conflicting things that you are likely hearing are coming from people whose "tuners" failed to calibrate/relearn the throttle bodies correctly. they will act a fool if you dont get that part right. everyone who has installed them, or had them installed properly, that i have talked to, are very, very happy with them. you will notice them when driving 100% of the time, as they add power/response even in non wot conditions... not many products are all that noticeable at part throttle, but these are.

I will. I'm not NA though. I'll have the AAM twin turbo on my car. I'm not certain what I'll be tuning with. Possibly Uprev for a while, then ECUTek. If Uprev steps up with some more features I'll likely keep it. We will see.

My dyno/tuning results
 

Ok gents, as promised, here are my results after getting a retune from Seb today. They are not back-to-back pre equipment/post equipment so take that as it is. Ill try and answer any questions I can for you.

Top graph is with EPS thottles and +20 degrees air temp from bottom graph
Bottome graph is from original tune about a year ago

Showing +4-5whp with 20 deg air temp increase

Over all I am very pleased with this purchase. Its not just the 5-10whp up top, its the more tq better response feeling down low and mid. I would not hesitate to recomend this mod to anyone that wants to spend the money. Just know that youll need a retune.

excellent work! and a very fair dyno of the product with untouched vvel maps. if vvel is optimized below the point when they start gaining in this dyno you will see those kind of gains all the way though, and more at those points. have Seb get in touch with me and I will consult with him about how to use this product to produce even more gains when combined with modified vvel events. again, great work and good gains for the mods you have.

Jake
EPS Tuning

Anyone with the Stillen Supercharger Manifold able to confirm this? Previous post shows that Stillen Supercharged guys were running 80mm TBs...

Which intake do you have and do you also have ported upper and lower manifolds?

Anyone able to answer this question as to what upper/lower intake plenums go best with these TB's.

I'm pretty sure I've answered this (not sure if it was to you or not but...). The best way to go about an upper/lower IM, is to get with either Synolimit or Synergy and have them port & port-match the components. For example [on my car], I had the manifolds (upper outlet/lower inlet) port-matched to each other. Afterwards, he ported the upper manifold inlet where it meets the TB outlet as much as he could without ruining where the gasket seals... from there, he port-matched outlet of the billet adapter that comes with the EPS TBs to the inlet of the upper manifold (and he double-checked that the outlet of the TBs were matched to the inlet of the billet adapter).

I'd say for an N/A car, this would be the best setup. You "should" be able to substitute the Motordyne/Z1 manifolds and have the same done to them, although I'm not sure how the Z1 is ported but I know the Motordyne is not. The results may change, or may be the same. The AAM manifold hasn't been shown to make or lose power (or do anything as far as anyone can tell), and neither has the RJ Mfg GTR conversion so your best guess is as good as anyone's for aftermarket manifolds.

Just got these installed. Was a very humid day but they baselined the car before adding the throttle bodies so you can see the improvement.

Dyno was on a Mustang Dyno.

Installed mods on car:
Injen Air Intakes
Upper/Lower ported intakes by Z1
FI Long Tube Headers
Magnaflow Exhaust

Attachment 122661

Nice pick up, and the curves look good. :tup:

I wonder how these compare with Synolimit's TBs?

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I chose the AAM intakes because of the larger size to go along with the larger throttles. No porting

What kinds of gains did you see? Hard for me to justify 2000 plus unless the gains are major.


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These are about $800.00.

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