Gas Pedal Delay

cab83_750 · 01-30-2013, 01:02 PM

Can you please see if your MPG changed?

cab83_750 · 01-30-2013, 01:03 PM

Can you please post if your MPG changed?

DIGItonium · 01-30-2013, 10:47 PM

Yea, it got worse. I find myself having too much fun.

Kidding... it shouldn't change. My average is about 22.4 MPG, and it's pretty much the way I drive. I've not had anything worse than 19 MPG, and that's the least I can do to have a bit of turbo fun.

IcedZ · 01-31-2013, 01:46 PM

Quote:

Originally Posted by DIGItonium

Yea, it got worse. I find myself having too much fun.

Kidding... it shouldn't change. My average is about 22.4 MPG, and it's pretty much the way I drive. I've not had anything worse than 19 MPG, and that's the least I can do to have a bit of turbo fun.

HOLY S***!!
I NEVER got 22.4 unless I cruised at below 70 on the interstate.
My average city driving was in the 18's, and 16's in the summer (less efficient / A/C probably) That was a huge factor in getting rid of the damn thing. If I actually got closer to 22, I would get another.

kenny's 370z · 01-31-2013, 02:06 PM

Quote:

Originally Posted by DIGItonium

So how did it go? Notice the motor sounds a bit different when you give it at least 50% throttle input?

We had record breaking highs yesterday at 75F, and I tried to get the oil temps up to 200F. Power-wise, it's not as exciting with the warmer ambient air, but I can still feel the continuous power increase as the throttle opens up.

Previously, power would build up and fall flat as I continue to press my foot down. My passengers think I lift my foot off the throttle.

yes,motor has that metallic reverb now as it should be.if i start driving hard,i will start to get a delay but that is in part due to heat.driving normally shifting at 4k,car runs perfect.WAY better than before.feels like i got rid of the "anchor" i felt like i was dragging.

ZForce · 01-31-2013, 04:29 PM

Quote:

Originally Posted by asdfsammich

Thanks ZForce. That the perspective helps a lot. I think I'm going to talk to my service manager this week.

ZForce · 01-31-2013, 04:50 PM

Quote:

Originally Posted by DIGItonium

So how did it go? Notice the motor sounds a bit different when you give it at least 50% throttle input?

We had record breaking highs yesterday at 75F, and I tried to get the oil temps up to 200F. Power-wise, it's not as exciting with the warmer ambient air, but I can still feel the continuous power increase as the throttle opens up.

Previously, power would build up and fall flat as I continue to press my foot down. My passengers think I lift my foot off the throttle.

My parts did not come as planned, partial order. So no workee on Monday. Parts did arrive yesterday and both cars are going in next Monday. Will update thread soon after testing.

Disappointing to hear there is still the ambient heat issue causing some throttle lag. Then again IIR are you not running with a TT ? And we would not be comparing apples to apples (as in car setup), correct me if I am wrong.

For the record my car never sees more than 19mpg, then again a ot of city driving. I think if straight highway I have seen 23 mpg. The bros Z a little better, lighter foot on the pedal.

DIGItonium · 02-01-2013, 11:12 PM

Happy to see the issue resolved for you, Kenny. Yea, powerband is a bit glitchy sometimes even after a warm start or when ambients exceed 75F. The car still doesn't fall flat on its face, though.

Haha... my daily commute consists of freeway driving, and it's about a 15 minute drive to work. So my car is on the freeway roughly 75% of the time. If I drive my dad's '05 Xterra for a week I would go nuts because that thing really guzzles gas no matter how conservative my driving habits are.

Anyhow, it has been nearly 30k miles since the TT install, so I'm going to do a bit of Spring cleaning with the filters, pipes, TBs, etc. Is it necessary to clean the PCV and hoses?

ZForce · 02-02-2013, 11:09 AM

we

m4a1mustang · 02-07-2013, 09:36 AM

Wow. That's all I can say.

The Huntsman · 06-29-2013, 11:19 PM

Quote:

Originally Posted by ZForce

we

ZForce, did replacing the brake switches solve your problems as well? I'm experiencing exactly the same symptoms as Digotonium, you, and a few others on this thread. I've read all 64 pages of posts...and am HOPING this is THE fix. I've brought up the issue with my service manager several times, but each time, the tech hasn't been able to reproduce it...It's so frustrating.

Please let us know! Thanks.

ZForce · 07-02-2013, 04:44 PM

Overall....no. It did solve the immediate lag...but as mentioned above and now that we are into the heat of the summer, it DID NOT fix the overall throttle lag. It's back to an ambient tempure with heat soak issue.

If your Z is still under warranty, you may be able to convince the service mgr that the gap between the contacts is more the 1 mm and should be replaced.

DIGItonium · 07-02-2013, 04:51 PM

That's true. I had intermittent lag regardless of temps even when my car was stock, and changing the brake switch resolved much of it.

Then the lag I had recently was pretty bad after an engine start, but it was also intermittent. I could hold it down in 1st and 2nd, and the engine felt like it had half the power and boost didn't even build up. It appeared to be caused by my HFC wanting to clog up (confirmed) due to running rich with the turbos. I also found an exhaust leak in which my last tech did not reuse the gaskets for the HFC.

My car is running so much better now with the test pipes. There are still times it doesn't seem to want to open up, but it's nowhere near as bad. Next up is filter cleaning after over 30k miles and also clean the throttle bodies. It might be sticky.

ZForce · 07-02-2013, 05:17 PM

^Good info. To add, I have Berk HFC's with no exhaust leak and clean my air filters every oil change. I have also swapped out the air filters for new ones. Issue is still the same.

The Huntsman · 07-04-2013, 08:44 PM

It sounds like we're all sh*t out of luck to a certain extent...short of brake switch replacement and an ECU tune as last resort. Even then, that's not guaranteed to fix the issue.

I did jiggle and play around with each of the switches behind my brake...and noticed a big difference in how she responded. It was only temporary, but still leads me to believe that's where some of the issue is stemming from.

Oil cooler is on the wishlist - it reached 118F here last weekend, and my oil temps always hover around 220+, even in cool weather.

Thanks for all the input guys - I've gone through and read most of the pages to this forum post. My issues are closest to Digitonium and ZForce, and I definitely can't fathom trading her in...nope, not yet.

01-30-2013, 10:47 PM	#948 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Yea, it got worse. I find myself having too much fun. Kidding... it shouldn't change. My average is about 22.4 MPG, and it's pretty much the way I drive. I've not had anything worse than 19 MPG, and that's the least I can do to have a bit of turbo fun. __________________

02-01-2013, 11:12 PM	#953 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Happy to see the issue resolved for you, Kenny. Yea, powerband is a bit glitchy sometimes even after a warm start or when ambients exceed 75F. The car still doesn't fall flat on its face, though. Haha... my daily commute consists of freeway driving, and it's about a 15 minute drive to work. So my car is on the freeway roughly 75% of the time. If I drive my dad's '05 Xterra for a week I would go nuts because that thing really guzzles gas no matter how conservative my driving habits are. Anyhow, it has been nearly 30k miles since the TT install, so I'm going to do a bit of Spring cleaning with the filters, pipes, TBs, etc. Is it necessary to clean the PCV and hoses? __________________

02-07-2013, 09:36 AM	#955 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Wow. That's all I can say. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-02-2013, 04:51 PM	#958 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	That's true. I had intermittent lag regardless of temps even when my car was stock, and changing the brake switch resolved much of it. Then the lag I had recently was pretty bad after an engine start, but it was also intermittent. I could hold it down in 1st and 2nd, and the engine felt like it had half the power and boost didn't even build up. It appeared to be caused by my HFC wanting to clog up (confirmed) due to running rich with the turbos. I also found an exhaust leak in which my last tech did not reuse the gaskets for the HFC. My car is running so much better now with the test pipes. There are still times it doesn't seem to want to open up, but it's nowhere near as bad. Next up is filter cleaning after over 30k miles and also clean the throttle bodies. It might be sticky. __________________

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01-30-2013, 01:02 PM	#946 (permalink)
cab83_750 Track Member Join Date: Apr 2009 Location: CA Posts: 887 Drives: 09 NISSAN 370Z Rep Power: 417	Can you please see if your MPG changed?

01-30-2013, 01:03 PM	#947 (permalink)
cab83_750 Track Member Join Date: Apr 2009 Location: CA Posts: 887 Drives: 09 NISSAN 370Z Rep Power: 417	Can you please post if your MPG changed?

02-02-2013, 11:09 AM	#954 (permalink)
ZForce A True Z Fanatic Join Date: Jul 2009 Location: Roseville, CA Posts: 2,359 Drives: 09 370Z Tour + Sport Rep Power: 21	we

07-02-2013, 04:44 PM	#957 (permalink)
ZForce A True Z Fanatic Join Date: Jul 2009 Location: Roseville, CA Posts: 2,359 Drives: 09 370Z Tour + Sport Rep Power: 21	Overall....no. It did solve the immediate lag...but as mentioned above and now that we are into the heat of the summer, it DID NOT fix the overall throttle lag. It's back to an ambient tempure with heat soak issue. If your Z is still under warranty, you may be able to convince the service mgr that the gap between the contacts is more the 1 mm and should be replaced.

07-02-2013, 05:17 PM	#959 (permalink)
ZForce A True Z Fanatic Join Date: Jul 2009 Location: Roseville, CA Posts: 2,359 Drives: 09 370Z Tour + Sport Rep Power: 21	^Good info. To add, I have Berk HFC's with no exhaust leak and clean my air filters every oil change. I have also swapped out the air filters for new ones. Issue is still the same.

07-04-2013, 08:44 PM	#960 (permalink)
The Huntsman Base Member Join Date: May 2012 Location: AZ Posts: 7 Drives: 09 370Z White MT TRG Rep Power: 13	It sounds like we're all sh*t out of luck to a certain extent...short of brake switch replacement and an ECU tune as last resort. Even then, that's not guaranteed to fix the issue. I did jiggle and play around with each of the switches behind my brake...and noticed a big difference in how she responded. It was only temporary, but still leads me to believe that's where some of the issue is stemming from. Oil cooler is on the wishlist - it reached 118F here last weekend, and my oil temps always hover around 220+, even in cool weather. Thanks for all the input guys - I've gone through and read most of the pages to this forum post. My issues are closest to Digitonium and ZForce, and I definitely can't fathom trading her in...nope, not yet.