[speedychuck2]

I flashed back to v6 ots maps a few days ago and things seem to have improved. The sudden jerk of power that I was suffering has not shown itself yet either. Seems too good to be true, but I will report back.

V6 is giving me 30fe errors occasionally, so I won't be sticking with it, bjt I have I say I didn't realise how much I preferred the power delivery to the v7 maps. Much more bottom end torque.

[Spyro235]

I just grabbed a carly, which can't log as well as the tuners,, but I can log. With a stead 12.9% throttle (just a hair above idle, super slight throttle application) I can an oscillation of calculated load from 13-30%, and then it sputters and goes back and forth. all while holding a constant throttle %.

[Varjo]

Originally Posted by speedychuck2

I flashed back to v6 ots maps a few days ago and things seem to have improved. The sudden jerk of power that I was suffering has not shown itself yet either. Seems too good to be true, but I will report back.

V6 is giving me 30fe errors occasionally, so I won't be sticking with it, bjt I have I say I didn't realise how much I preferred the power delivery to the v7 maps. Much more bottom end torque.

Are the v6 maps as safe as the v7? I don't remember exactly what changed with v7.

[Jeff@TopGearSolutions]

Originally Posted by speedychuck2

I flashed back to v6 ots maps a few days ago and things seem to have improved. The sudden jerk of power that I was suffering has not shown itself yet either. Seems too good to be true, but I will report back.

V6 is giving me 30fe errors occasionally, so I won't be sticking with it, bjt I have I say I didn't realise how much I preferred the power delivery to the v7 maps. Much more bottom end torque.

30FE is overboost, sounds like a turbo/wastegate issue. They could be possibly sticking but really it can be a multitude of things.

[speedychuck2]

Originally Posted by Jeff@TopGearSolutions

30FE is overboost, sounds like a turbo/wastegate issue. They could be possibly sticking but really it can be a multitude of things.

I'm pretty sure I know the reason of it already, when I installed my dp's I had one of the v bands clocked wrong and it was holding one wastegate open. I moved it round, but it wouldn't move far, far enough to close the wg, but I think it is stopppng it from opening fully. I should think that's my problem. Less noticeable with the way the v7 maps build boost but as v6 are more aggressive that's it.

I need to get back in there and check really but it's awkward as hell to get at.

[speedychuck2]

Originally Posted by Varjo

Are the v6 maps as safe as the v7? I don't remember exactly what changed with v7.

As far as I am aware, yes. It was the v5 maps that had the knock tables de sensetised. V7 were supposedly re written from the ground up as a smoother, more driveable but less powerful map.

[NoGuru]

My "hesitation" or "missing" in the higher RPM's went away after flashing from Stage 2+ to just Stage 2.
So I would think a custom tune would fix it for me.

[335e92tx]

had same problem on a 2007 n54 with 120K miles. Mostly at 1200-1500 rpm - surge a light throttle. Log from last OCt when I Was trying to track it down - (it had a Juicebox - that got pulled off. Then it was stock, still surge.. and then finally MHD). It got TMAP replaced, Vanos solenoids replaced, front O2 sens replaced.

http://www.datazap.me/u/jimmyb/log-1...0&data=2-21-24

[sublian]

Any updates on light throttle jerking ? Mine happens around pedal input 30-45. Doesn’t matter which gear or rpm? Tried all the various menu 11 and 12 settings still there. Only thing I haven’t changed is the tmap n20 sensor which I will be and the TB.

Thought I was the only one having this issue lol

[Spyro235]

Originally Posted by sublian

Any updates on light throttle jerking ? Mine happens around pedal input 30-45. Doesn’t matter which gear or rpm? Tried all the various menu 11 and 12 settings still there. Only thing I haven’t changed is the tmap n20 sensor which I will be and the TB.

Thought I was the only one having this issue lol

I solved mine by cleaning the vanos solenoids and resetting all my adaptations.

[sublian]

Originally Posted by Spyro235

I solved mine by cleaning the vanos solenoids and resetting all my adaptations.

I had a vanos code on the intake side so I replaced it too .. resetting adaptations doesn’t help me.. if anything makes it more noticeable lol

[NoGuru]

Winter here so I can test but I think mine is a leaky injector.

[milfriez]

Weighing in on this to see if anyone has found a REAL solution.

I've gone down

HPFP, high and low pressure sensors, all 6 injectors, walnut blast, O2 sensors and it's still there. Have new coils and plugs, but upon pulling those, noticed oil on plugs 1-3 and in the cylinders.

Trying to figure out if its worth putting in money for the valve gasket replacement, and battling back and forth with all the rest of the diagnostic crap and just dumping more and more money into parts, as i think the turbos are on their way out also.

[Silent9n54]

Originally Posted by Jeff@TopGearSolutions

Unfortunately it's such a common issue and a broad one at that.

Most of the stuff you mentioned could in fact still be the culprit.

I've actually replaced all 6 plugs, injectors and coils at the same time and still had the hesitation. Walnut blasting is up next for me but other then that it might just be in the tune. I'm on MHD Stage 2+ myself and I swear it's in the tune. If I go back to stock I can't feel the hesitation. If I reset adaptations the hesitation goes away for a little but eventually comes back. I've also tapped the intake manifold for the Tial and that did help a little. It's actually barely noticeable probably for an average Joe but I can still feel it. I think it just comes down to process of elimination with these kind of problems.

sorry to dig up an old thread but do you remember what happened to be the issue ??? throttle reset helps for 20 mins and then it hesitates again at low rpms

[Silent9n54]

Originally Posted by milfriez

Weighing in on this to see if anyone has found a REAL solution.

I've gone down

HPFP, high and low pressure sensors, all 6 injectors, walnut blast, O2 sensors and it's still there. Have new coils and plugs, but upon pulling those, noticed oil on plugs 1-3 and in the cylinders.

Trying to figure out if its worth putting in money for the valve gasket replacement, and battling back and forth with all the rest of the diagnostic crap and just dumping more and more money into parts, as i think the turbos are on their way out also.

did u ever figure out what was the issue ?

[milfriez]

Originally Posted by Silent11N54

did u ever figure out what was the issue ?

Man, its amusing to me coming back to read this. Because no, I never figured it out. Just this past weekend, I pulled plugs (NGKs) and checked the gap on all six. I adjusted a bit and drove for 10-15 minutes. I thought finally the demons were gone.

NOPE

Driving back to work I found them again. This car is now not my DD any longer, so I don't put as much time and effort into it as I should. To the point of the other poster, I am also on JB4 + MHD Stg 2, but I've had the hesitation since prior to MHD. I also took the car to TPG, who I had hoped would correct the issue but instead got "there is a slight miss at lower RPM, nothing major though". To this day, its not a SLIGHT, its a noticeable jerk and bucking. Zero codes though, which is the utmost frustrating part in the world, there is nowhere to start diagnosing.

The only thing I noticed was that the replacement coils I bought (Bosch) when I removed them from the engine, some of the rubber is wearing away. Not sure if this would have any adverse effects on the ignition system or not. I'm to the point where I might go back to stock (tuning) to see if it goes away, but I know on MAP0 on JB4 it still exists. Good luck man, if anyone else has anymore valid input, I'd love to hear it because here we are 2 years later and almost FBO I'm still plagued by this.

[Silent9n54]

Originally Posted by milfriez

Man, its amusing to me coming back to read this. Because no, I never figured it out. Just this past weekend, I pulled plugs (NGKs) and checked the gap on all six. I adjusted a bit and drove for 10-15 minutes. I thought finally the demons were gone.

NOPE

Driving back to work I found them again. This car is now not my DD any longer, so I don't put as much time and effort into it as I should. To the point of the other poster, I am also on JB4 + MHD Stg 2, but I've had the hesitation since prior to MHD. I also took the car to TPG, who I had hoped would correct the issue but instead got "there is a slight miss at lower RPM, nothing major though". To this day, its not a SLIGHT, its a noticeable jerk and bucking. Zero codes though, which is the utmost frustrating part in the world, there is nowhere to start diagnosing.

The only thing I noticed was that the replacement coils I bought (Bosch) when I removed them from the engine, some of the rubber is wearing away. Not sure if this would have any adverse effects on the ignition system or not. I'm to the point where I might go back to stock (tuning) to see if it goes away, but I know on MAP0 on JB4 it still exists. Good luck man, if anyone else has anymore valid input, I'd love to hear it because here we are 2 years later and almost FBO I'm still plagued by this.

wow i cant believe that you still didnt figure it out ! My car does it with a stock tune without a single mod, and once i loaded a mild tune its acting the same. No codes for me so its hard to find a place to start. I will swap coils, plugs and vanos solenoids from my other n54 this weekend to see if there is a difference.

[Hoper]

Originally Posted by Silent11N54

wow i cant believe that you still didnt figure it out ! My car does it with a stock tune without a single mod, and once i loaded a mild tune its acting the same. No codes for me so its hard to find a place to start. I will swap coils, plugs and vanos solenoids from my other n54 this weekend to see if there is a difference.

Hi Guys,
This is a tuning issue, comes about when the OTS tunes can't quite match up the load request against the actual load, whenever the actual load goes above the load request the DME shuts the throttle, then the actual load drops, then it opens it again, then it repeats

Cars with mods build boost and therefore load much quicker than stock, which the DME can't quite cope with using a stock and in some cases OTS tune

I'll dig up a log I have showing what's happening, Tim has tuned it out of my car, the OTS MHD tunes had it for me

There may be other causes as not every car is the same, but if you take a log and see the same as the log I'll post, you'll know what it is

adding the link to the log
if you just select load req and load actual you'll see where the load actual keeps crossing the load req

https://datazap.me/u/hoper/light-thr...-18&zoom=57-99

[Silent9n54]

Originally Posted by Hoper

Hi Guys,
This is a tuning issue, comes about when the OTS tunes can't quite match up the load request against the actual load, whenever the actual load goes above the load request the DME shuts the throttle, then the actual load drops, then it opens it again, then it repeats

Cars with mods build boost and therefore load much quicker than stock, which the DME can't quite cope with using a stock and in some cases OTS tune

I'll dig up a log I have showing what's happening, Tim has tuned it out of my car, the OTS MHD tunes had it for me

There may be other causes as not every car is the same, but if you take a log and see the same as the log I'll post, you'll know what it is

adding the link to the log
if you just select load req and load actual you'll see where the load actual keeps crossing the load req

https://datazap.me/u/hoper/light-thr...-18&zoom=57-99

the car i just bought is bone stock and never had a tune, so i dont see how it correlates with a tune if the car wasnt running right bone stock.

[streettuned519]

Ok im reviving an old thread because it never led to a proper resolution and I have searched far and wide on the internet for a proper solution. Here the data-log I made today and one thing that stands out to me is that the "boost" and "boost target" do not line up. Once I floor it im at 20PSI and then it slowly decreases from there which I find odd...

Any help on this topic? I love the car but im not even at 50 000miles and im having all these hesitation issues and like the graph shows i feel like the powerband falls off later in the RPM range.

https://www.spool street.com/graphs/log-02-10-2021-22-52-44.5637/

[Saif2018]

Originally Posted by streettuned519

Ok im reviving an old thread because it never led to a proper resolution and I have searched far and wide on the internet for a proper solution. Here the data-log I made today and one thing that stands out to me is that the "boost" and "boost target" do not line up. Once I floor it im at 20PSI and then it slowly decreases from there which I find odd...

Any help on this topic? I love the car but im not even at 50 000miles and im having all these hesitation issues and like the graph shows i feel like the powerband falls off later in the RPM range.

https://www.spool street.com/graphs/log-02-10-2021-22-52-44.5637/

Can you post on datazap.me in future, it's free.

Boost psi is all over the place first it overboosts significantly then underboosts forever almost till redline.

Bad Boost solenoids could be causing this issue.

Which map version exactly are you running and what mods?

[streettuned519]

Originally Posted by Saif2018

Can you post on datazap.me in future, it's free.

Boost psi is all over the place first it overboosts significantly then underboosts forever almost till redline.

Bad Boost solenoids could be causing this issue.

Which map version exactly are you running and what mods?

I tried to use datazip but MHD said "coming soon".

Yea I noticed the exact same thing. Im running MHD stage 2+ with FMIC, Chargepipe, Injen intake, catless DP and full exhaust.

Changed the oil and NGK spark plugs gapped to .022 last weekend.