Gas Pedal Delay

IcedZ · 06-14-2010, 09:19 AM

Quote:

Originally Posted by RCGsupra

Sounds to me more like self induced limp mode, so to speak.

Definitely not. I had somebody else drive it until it hit 220, then had him drive it hard for a couple runs. He was shocked. Then he was doubly shocked when I told him to look at the oil temp gauge. He's a Ford Mechanic.

Valentino · 06-14-2010, 11:30 AM

Quote:

Originally Posted by mrdino77

Is that done just with UpRev or some kind of tune?

I tuned it with COBB. Don't know if you can do it or not with UpRev.

ChrisSlicks · 06-14-2010, 11:54 AM

Quote:

Originally Posted by m4a1mustang

Interesting. I need to get a video of my car... If I give it throttle in 1st or second gear under 3k RPM it just bogs down and literally does nothing for a second or two... then it goes.

It's kind of funny because it throws me forward as I'm bracing for acceleration (it starts to go, then stops... waits, then goes). It's NOT VDC I can tell you that.

Been toying with putting the stock intakes back on the car (and exhaust if necessary) to see if any of those are causing a problem, but I should probably just get the thing tuned.

Now that I think about it, it behaves as if the car isn't picking up any fuel... I wonder if it could be a pickup issue?

I've never experienced that outside of fuel starvation. Were you running at or below 1/4 tank?

If it was VDC you would have constant speed (no acceleration) but if it is fuel you will get deceleration as if you had lifted completely off the gas in gear.

m4a1mustang · 06-14-2010, 11:58 AM

Quote:

Originally Posted by ChrisSlicks

I've never experienced that outside of fuel starvation. Were you running at or below 1/4 tank?

If it was VDC you would have constant speed (no acceleration) but if it is fuel you will get deceleration as if you had lifted completely off the gas in gear.

Probably not fuel starvation, then. I don't think it's VDC because the light never turns on and I'm pretty sure I can replicate the problem with it off. I'll have to do some testing this weekend and report my findings!

Daishi · 06-14-2010, 12:18 PM

Quote:

Originally Posted by m4a1mustang

Probably not fuel starvation, then. I don't think it's VDC because the light never turns on and I'm pretty sure I can replicate the problem with it off. I'll have to do some testing this weekend and report my findings!

I noticed this started happening after I installed the injen intakes. I think you need to get the car tuned because I used to have the same problem. The A/F ratios were way off on my setup and now its 98% gone cept when it gets rediculously hot out but thats going to happen either way when its 90 out.

m4a1mustang · 06-14-2010, 12:33 PM

That could be it. I might take them off and see if I still have the problem.

cfleming2226 · 06-14-2010, 01:26 PM

So it the general consensus when the Oil Temp gets to 220 performance goes downhill and I should expect the delay? I am running at 220 all the time, as its 100+ out every day and soon to me most nights, gotta love AZ.

m4a1mustang · 06-14-2010, 01:29 PM

Quote:

Originally Posted by cfleming2226

So it the general consensus when the Oil Temp gets to 220 performance goes downhill and I should expect the delay? I am running at 220 all the time, as its 100+ out every day and soon to me most nights, gotta love AZ.

That's not really consensus. Oil temp shouldn't cause the type of delay we are describing. Yes, at 220 the engine will not be as powerful as it is at 200, but it shouldn't fall flat on it's face when you punch it either.

IcedZ · 06-14-2010, 03:02 PM

Quote:

Originally Posted by m4a1mustang

That's not really consensus. Oil temp shouldn't cause the type of delay we are describing. Yes, at 220 the engine will not be as powerful as it is at 200, but it shouldn't fall flat on it's face when you punch it either.

Doesn't seem to be consensus, but I still feel that could be it. m4a1mustang, it doesn't sound to me like you have experienced this first hand either. You have to feel it and experience it to know what I mean.

m4a1mustang · 06-14-2010, 04:17 PM

Quote:

Originally Posted by IcedZ

Doesn't seem to be consensus, but I still feel that could be it. m4a1mustang, it doesn't sound to me like you have experienced this first hand either. You have to feel it and experience it to know what I mean.

I do know there is a lack of response (read: noticeably less power) when the temps are higher, I just think what I'm experiencing (2-3 seconds of NOTHING, even with the throttle floored) is unrelated as it doesn't matter if the car is cold or hot... it won't go.

I'm thinking it might be related to the intakes as Daishi suggested. Will have to do some digging this weekend to find out.

RCZ · 06-14-2010, 04:23 PM

are you guys just stomping on the throttle with low revs? this isnt a corvette.. Mine only ever does it when I stomp full throttle at low rpm. That's normal though..

cfleming2226 · 06-14-2010, 05:21 PM

Quote:

Originally Posted by RCZ

are you guys just stomping on the throttle with low revs? this isnt a corvette.. Mine only ever does it when I stomp full throttle at low rpm. That's normal though..

I get what you are saying and yes my issus comes when I floor it at low RPM's. i'm not expecting it to take off as a Corvette would, I just found it odd that there was such a delay in anything happening. Heck, my FX 35 would respond faster in the same situation.

Jordo! · 06-14-2010, 05:24 PM

No perceptable delay on mine.

'09 or '10? Might be slightly different ECU logic?

Any mods? Intake or exhaust might throw off tip-in fueling.

EDIT: looks like a lot of folks with this issue have intakes. Yep, either by throwing off MAF signals or actually drawing in more air and running leaner, tip-in will be affected most noticeably.

On tip-in, the ECU will add extra fuel for smooth transitions from one location in the map to another. You should be able to get that tuned -- but it will have to be ROAD tuning.

I don't think you can adjust tip in effectively on a dyno.

spearfish25 · 06-14-2010, 06:19 PM

My girl takes off when I floor it. I can 100% agree with the oil temps affecting response though. It's incredibly dramatic. Below ~220F, the car accelerates like a banshee, but above ~220F it gets progressively more lethargic. Thank God my oil cooler is on the way!

cossie1600 · 06-14-2010, 07:42 PM

The drive by wire/ECU mapping creates a slight lag at the lower RPM, the only thing you can do is flash the ECU. If you have driven a 350z, you will know the 370's throttle response is not up to par.

06-14-2010, 12:33 PM	#36 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	That could be it. I might take them off and see if I still have the problem. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

06-14-2010, 05:24 PM	#43 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	No perceptable delay on mine. '09 or '10? Might be slightly different ECU logic? Any mods? Intake or exhaust might throw off tip-in fueling. EDIT: looks like a lot of folks with this issue have intakes. Yep, either by throwing off MAF signals or actually drawing in more air and running leaner, tip-in will be affected most noticeably. On tip-in, the ECU will add extra fuel for smooth transitions from one location in the map to another. You should be able to get that tuned -- but it will have to be ROAD tuning. I don't think you can adjust tip in effectively on a dyno. __________________ Enjoy it. Destroy it. Last edited by Jordo!; 06-14-2010 at 05:27 PM.

06-14-2010, 06:19 PM	#44 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	My girl takes off when I floor it. I can 100% agree with the oil temps affecting response though. It's incredibly dramatic. Below ~220F, the car accelerates like a banshee, but above ~220F it gets progressively more lethargic. Thank God my oil cooler is on the way! __________________ 2013 Cadillac V-Wagon, RIP Z

06-14-2010, 07:42 PM	#45 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 29	The drive by wire/ECU mapping creates a slight lag at the lower RPM, the only thing you can do is flash the ECU. If you have driven a 350z, you will know the 370's throttle response is not up to par. fantaZ likes this.

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cfleming2226 Base Member Join Date: Jun 2010 Location: Gilbert, Arizona Posts: 60 Drives: 370z S/TOUR BLU 7AT Rep Power: 14	So it the general consensus when the Oil Temp gets to 220 performance goes downhill and I should expect the delay? I am running at 220 all the time, as its 100+ out every day and soon to me most nights, gotta love AZ.

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RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	are you guys just stomping on the throttle with low revs? this isnt a corvette.. Mine only ever does it when I stomp full throttle at low rpm. That's normal though..