Did you hit fuel cut?

Talked to two people now and confirmed its very likely fuel starvation/running too lean ( but I already knew that)


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That's what it felt like.


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It is throttle cut.(throttle blades close b/c of the ecu Uprev can change the rpm when this happens no biggie)

sound like a fuel cut or like Baer383 said!!!

Throttle cut is always first followed by fuel cut followed by fuel restore in that order.

If you have not disabled ETC in your ROM, this is throttle cut. Completely normal. It literally closes the throttles on you.

If you disable ETC it can only cut fuel, which is a slightly less safe way to limit RPM, especially if you're boosted. (Ideally you'd cut fuel and spark, but cutting spark results in backfiring and emissions-conscious automakers won't blow fuel out of the engine no matter what.)

I have ETC disabled so fuel cut is all I have, and for me, it's fine. It's a lot less abrupt than throttle control, but can cause the engine to stumble when you get back into the throttle, if you're really beating on it.

This is correct.

Fuel restore is generally a lower RPM than the fuel cut (rather than the same RPM). If your ETC is enabled, you shouldn't really hit fuel cut in normal circumstances, at least N/A. I suppose you could have so much boost in the pipes that revs could continue to climb after the throttles begin to close, under low loads (1-2 gear).

It is on,he is running Sam's tune.

Learned something new today. Thanks!


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Update on tune: With the cats off it and the ART pipes on, before even starting to tune the car we are at 470whp. Lesson we've learned here: Superchargers do not like cats.

Whoever bet I was going to lose power with those pipes owes me a beer.

I have 516 rwhp with stock cats on.

great to hear that my friend!!!:tup:

Cats on: 450whp (no tune)
Cats off: 470whp (no tune)

I'm not trying to beat your dyno number, I am only interested in gains. This might be useful info for someone else on down the line.

The cats keep back pressure and with the VVEL in these cars the back pressure will help with cylinder fill,I put Berk HFC on and lost 35 rwhp.

Definitely strange. You'd think pipes would cause more of a loss but they didn't. Same dyno, same tuner so it's definitely a legit gain.

So how much fun have you been having with it since you've gotten it back? It's amazing how well these motors take to boost. And the chassis handles the power like it was meant to have it.

I wonder if it is since he is just running the GTM canned tune, and it is fairly tamed overall, that just opening it gives some extra HP.

:iagree: My thought process exactly.

I'll have final numbers once they get in there with the Uprev software tomorrow morning. Dropped off the GT-R spark plugs earlier this evening.

hey dmhenderson.. one of the guys in the club i'm in pointed me towards your build. I've got a 2011 touring/sport and will be installing the 1.5 kit myself. your thread has been very helpful, lol I'm trying to read everything i can before the kit gets here

how's the car running? any updated numbers?

So I think I've figured out the deal with the rotor caps. I have H&R DRS spacers and I think the replacement studs might be slightly different than the stock studs (different thread) which is causing the problem. I may be able to get a shop to modify the caps to fit but I'm not sure if it's worthwhile. They'd look pretty damn hot though.

How is your car running?

No more low end sputter. Very clean through the gears although the clutch is definitely starting to show stress. Still getting used to the stink cloud that follows the car everywhere but honestly, I kinda like it.

Also turned off traction control because it's exhibiting very strange behavior especially when stressed.

Anyone know if there's a way to permanently disable the traction control without hitting the button every time I get into the car?

There is a module you can get it is like 50 bucks I'm trying to find it for you.

The GTM solution is like $2300 and there's no way I'm spending that for training wheels.

Edit: Oh you meant to disable. Yeah I would be interested.

Here it is!!!!!

http://www.the370z.com/diy-section-d...-own-risk.html

Neat. Thanks!

Swapping to an 88mm pulley this week along with retuning to take advantage of the 5 maps I have available. Pretty stoked.

Finished my winter detail today. Almost time to put her away for the season :/

Nice man. I'm interested to see what kinda power the 88mm makes. :tup: How's the car doing?

Car is tuned. We stopped it at 495.4whp. Frank (Hill's Garage) said it has another 20-30whp in it but doesn't want to mess with timing any further especially with cold weather coming up - add to that the fact that I asked him not to take it over 500whp.

Frank's exact quote was "she wants more but I don't want to give it to her".

Things we have learned from this build:

-Pulley size is everything. You will get a max of 450-460whp on the 92mm pulley (very likely less than that). The 88mm pulley will take you up to 550whp depending on supporting mods.

-Cats (or lack thereof) do not matter or at least make *very* little difference. We have a guy in MAZOC who runs cats on a similar GTM kit for 20k miles and they haven't melted/fallen apart. I am not running cats and can easily make the same power without the added backpressure. This is a fact backed up by the opinion guy who is widely respected as an expert on these cars - and proven out during the tuning process. I apologize in advance if you don't agree with me but this has been my experience. Let's leave it at that.

-GTM can be challenging to deal with as a customer but the product is solid and the kit quality is good. Fitment issues are definitely a thing and if you have anything that isn't stock under the hood, you should probably check with Mike/Sam and your installer to see if you're going to have problems before you commit.

I am not interested in high score pissing contests or keeping my build secret. Hopefully this thread will be helpful in the future. Please feel free to PM me if you have questions.

~FIN~

I'd love to see a graph of the results. I'm curious to see how being catless affects low end compared to running cats.

I know with my build, running a cat, the 1.5's make a bit more under 4k rpm. It's not till over 5k rpm that my twin setup has an advantage.

How does it feel after the tune?
And yes I agree, it can be trying at times with GTM. Patience will be needed in spades.

I'm gonna close this thread now but if anyone has any questions, please PM me.

Re-opened. E85 conversion is a go.

So we're 6 months in and I've seen only minor issues with the supercharger:

-Had to ugprade my tires and diff. Stomping on the gas in 1st prior to the upgrade resulted in hilarious "1 wheel peels" that would end up sending the car sideways on occasion.

-Car would break loose accelerating through turns. I love ~doriftu~ as much as the next guy but I'd rather not do it unintentionally.

-Small oil leak near the SC oil cooler found and corrected. Had a hell of a time finding it (Frank at Hill's found it eventually). The leak was very small and would only appear when the engine was hot (hot-hot) which made it difficult to track down...and the last thing you want to do when you find a puddle of oil under your FI converted car is to push it hard again to figure out where it's coming from.

-The clutch is beginning to go. It simply can't hold on under WOT in 2nd and 3rd and will slip. I've only had it come completely loose on me once but that was in 3rd at ~6000RPM. Not getting that burning clutch smell but it just can't grip hard enough when the car really wants to go.

Up next: Full E85 conversion.

I am lucky enough to have tons of E85 stations around me so I'm going to run around on the stuff. The car isn't a DD so I'm not worried about being stranded, plus I will have an emergency pump gas tune to fall back on just in case.

-Upgrade Bosch 645cc injectors to Injector Dynamics 1000cc injectors

-Upgrade 255lph fuel pump to 340lph. Not sure which brand yet. Was going to go with Aeromotive but apparently they have corrosion issues so with E85, they're out. Probably either Walbro or Deatschwerks.

-Aggressive re-tune for E85 and re-tune for pump gas as well.

What I'm expecting:
-Minor power bump. Since I'm running static boost with the SC, I'm not expecting a huge bump in WHP like the turbo guys do when they dial up the boost.

-Lower ambient engine temperatures = less power fade over time = fewer heat concerns.

-Most importantly, detonation-proofing the engine.

sound great dude!!! can wait to buy a sc or turbo kit to my Z in the future :excited:

Well once you have the e85 tune, unless someone jumps on here tomorrow, you will be the first known e85 SC.