Golf/GTI VI :: Losing A Little Boost At Higher RPMs
Jul 7, 2015
I have been looking around for some boost information. I have come across a few threads that have boost graphs, but the images are no longer available. I have tried to get a hold of some of the posters, but no luck.
I only recently hooked up a boost gauge and have been monitoring my boost more. I had a slight feeling before I hooked it up that I was losing a little boost at higher rpms. Between 4500-5000 my boost drops from 18 to 15 and then from 5000-6000 it drops to about 10. I know it's sometimes normal for boost to drop at top end, but I'm not quite certain it's supposed to be that much.
I installed the Spulen Boost Pipe Kit hoping it may make some type of difference, but it's the same. What it might be? I have checked all my pipes as best as possible, but couldn't find anything.
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I have a 2002 gti with an apt software tune. Whenever I'm on the interstate in 5th gear for a while. And I'll start to speed up. Once 4k kicks in. My boost no longer works when it normally pushes like 22psi. Then after slowing down. No matter what gear I'm in. It limits back to 10psi of boost and once I hit 4k. It goes super slow and boost won't work. I'm not sure what else I should get to restore my car to perform fully.
I'm currently on the factory ko3 turbo and the previous owner had nitrous hookups and lines to the motor.
I'm already 3k into fixing it. Needed new shift cables and a fresh transmission
I'm hoping to push about 250hp maybe 300hp
The boost problem is fixed once I turn the car off and back on. I just want it to work again without having to spend an arm and leg on parts and labor. My mechanic works at Volkswagen dealership. But isn't allowed to work on my car due to dealership policies about working on vehicles older than 10 years old. The guy who tuned my car professionally at an apr shop told me that I should get a smoke test done (idk where or how to do that) for my vacuum lines and that I have a cylinder 4 misfire. It may be a bad coil or spark plug. But I'd like to get some performance out of my car and I don't know what else or where to start.
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I have a 2002 gti with an apt software tune...
Whenever I'm on the interstate in 5th gear for a while. And I'll start to speed up. Once 4k kicks in. My boost no longer works when it normally pushes like 22psi
Then after slowing down. No matter what gear I'm in. It limits back to 10psi of boost and once I hit 4k. It goes super slowe and boost won't work
The guy told me that I should get a smoke test done (idk where or how to do that)for my vacuum lines and that I have a cylinder 4 misfire. It may be a bad coil or spark plug. But I'd like to get some performance out of my car and I don't know what else or where to start. I am new to this.
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2003 jetta gls 1.8t 5spd - gts stage 1 tune(gonzo stage 2)
tt 2-1/2" downpipe with high flow cat
turbo smart splitter valve(set to divert only)
turbo inlet pipe
homemade intake with k&n filter
stock n75 valve (f)
So in first through 3rd gear my car gets 20psi of boost then at 3,500 ish rpm smoothly starts to lower down to 15psi. but in forth and 5th gear the boost drops faster, enough so the diverter valve actually opens. then the boost will bounce up and down, around 15psi. the car still accelerates but with obvious power loss.
Is my diverter valve not "firm" enough? it is adjustable, so I've tightened it as much as it can. it doesn't seem to change anything. it came with spring spacers to make it tighter, but I haven't tried that yet.
Is it something with the tune? not enough fuel, need bigger injectors? The problem is only at about 100mph, so its not a big deal. I would like to get it straightened out if possible.
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so there is no visible signs of a boost leak and my boost gauge shows normal vacuum at idle indicating its not a vacuum leak, yet in the higher rpms im loosing boost.
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car is losing boost as soon as it goes above the 3500 range.
it will reach peak boost at WOT but begin to tamper off as it goes higher in the range and will reach as low as 5lbs towards 5-6k
i have an apr stage 2+ tune and my peak boost is usually 17-19 lbs.
check all hoses and everything checks out fine.
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I noticed this sound on Thursday, I couldn't replicate the issue at first, but it's getting worse. I can now replicate it almost any time I get into boost in a higher gear (4th, 5th mainly). Partial throttle, usually starts around 3,000 RPMs. Can't quite tell where it's coming from, but it's a bit concerning. I've got 16,000 miles on it with no mods (DSG gti). It'll be going to the dealer next week for sure, but what it could be? Kind of afraid to be driving it, but my dealer is closed until Monday and I wont be able to get over there until the afternoon.
Sound starts at about 6 seconds into the video (it's quiet, but you can hear it well if your volume is up), turbo starts spooling up at about 4 seconds. The car has a slight hesitation when the noise happens, but it's not violent. No CEL.
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I have a 3inch cat back exhaust, cold air intake, and a stage 1 apr tune. I just installed a front mount intercooler. When I spool my turbo in 1st gear the car loses all power at 4 grand and just bogs out after that. Rpms keep climbing but the speed doesn't move. What's going on?!
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So I installed a new f23 turbo about a month ago now. Doug over at frankenturbo has been working with me to tune my car, but we have figured there is a possible boost leak. I've checked all my hoses and can not find any bad connections. My current setup is a forge twintercooler, cts intake, and a ecs boost gauge. I've been over everything 3 times now and can not see where anything could be leaking. I can tell you when in low rpm's the power and boost is very weak. Doug suggested to turn the wastegate up and we did. Still no result for the low rpm to build boost. I'm at a loss.
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Recently bought a MKV R32. Already had a magnaflow cbe, k&n panel filter, and some emissions stuff taken out from under the hood. not sure if it has been flashed, waiting to get a vagcom. think it is pretty stock other than that. My problem is about 2 weeks after I got it, I started to notice an exhaust leak or vacuum leak or both at higher RPMs, like above 3 or 4k it starts. The exhaust has a nice deep rumble in normal driving but when the leak noises start that is all you hear, the exhaust note disappears completely. I have tightened the clamps on the cbe and still does it. Not sure what to look for.
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I have a 2004 Jetta 1.8t. 160k miles. Bought it recently. It's been overheating on me. Mainly on the freeway while having the RPMs higher than the small streets. I don't see any leaks. I'm not losing any coolant. But I do smell burning coolant. I don't see anything smoking though. I changed out the coolant temp sensor. I have a thermostat but haven't gotten to it yet. Just wanted other opinions before moving on. There is some sort of little motor on the radiator with some coolant hose connected to it. When turning off the car, it stays on and buzzes for a good 10-15 minutes before stopping. I'm not sure if that has anything to do with it. I don't even know what that thing is or called.
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When I first got my car it had a flat spot while driving hard at higher rpms. Almost as if something were actually holding the car back, it would pull nice up to that spot and then just almost die off. I eventually got unitronic flash and it seemed better but it was still doing it. Later companies started coming out with dsg flashes and this seemed to be the remedy but I now have hpa dsg flash and it still does it from time to to time. Could this be a faulty coilpack, or an issue with the intake manifold valve that changes over at higher rpms?
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When not using the manual mode of the DSG...What are the differences between driving in D and S? It seems like the car shifts more aggressively in S mode, allowing higher rpms before it shifts. Are their any other pros/cons to the different driving modes when in automatic, And what do most drivers prefer?
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I have about 350 miles on my new jetta and i will like to know if its just me or did everyone with a manual go through the same, i feel that up shifting at higher rpms like 4k i feel like the clutch is grinding i actually feel it in the pedal, I haven't gone higher than 4k due to break in period. I also notice that there is no engage while getting out of first almost like its slipping but it is not, i have driven manual most of my life so i know i am not slipping the clutch.
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I have a golf mk4 1.8T AGU, about one week after i had my k04-023 turbo on and all the Stuff that comes along it started "stall" (don't know if its the right word??) in the High gears, most 5th gear but it first start doing it when i hit boost (3000rpm)
I runs on Stock n75 valve.. I though i could be a boost problem, maybe the Stock system cant handle it? I did install a boost gauge to see if it was the was the problem, and it dont Seem like it. In first it runs from 1.4 bar and drops to 1.2. Same in second and third. But in 4 and 5th it goes to 1.7 bar and drops to 1.4.. I did wonder it maybe the n75 valve cant handle 1.7 bar??
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Ok, I have a 95 F150 5.0. It's sat for 6 months with the engine taken apart. I just finished putting everything back together with a new alternator. Well, I pulled a bone-head move and forgot to connect the harness when I fired the truck up. Other than not charging though, it ran fine. When I connected the harness, it began to chirp and shudder at low RPMs and squeal and vibrate at higher RPMs and it over heated VERY QUICKLY.
So hot the case was too hot to touch and the pulley smoked the belt. The engine didn't even have time to get up to operating temperature. I've had the alternator replaced twice, and this last one tested good putting out 14.5 volts. The work I did on the engine was to replace the valve springs, install a direct drive timing gear, replace a spun harmonic balancer, bypass the smog pump because it froze up, new distributor, a new ECU and O2 sensor.
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Car: 2006 Passat 2.0t 6mt - 81k miles. Has lived a grocery-getter life with an occasional romp on the back roads on the off chance the wife and kids aren't with me.
Symptom: Total loss of power (boost?) at at around 3-5k rpm and almost no power to accelerate (10-15sec to get one more mph). Service Engine light has come on twice, but clears with time or removal of negavive battery terminal. At low RPM range power is good, but suspect minor power loss. I'm only partly suspect on that last statement since I only drive it once a week. Idle seems normal, engine sounds normal at idle. Last week I did notice a barely audible whistle when boost is engaged. I have no access to a Vag-Com accept at the dealer.
The car let me down last weekend when I was smoking a jerk in a BMW that wouldn't let me get on the interstate. If it is the PCV and DV, where I can get one? Also, I'm not a tuner. I want OEM performance.
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I got a 04 jetta gli that is making a loud blow off noise at around 15 psi. Up until then the the boost holds fine but then at around 15 psi it just starts whistling really loud and loses all boost. I recently replaced the DV and venthose by the camshaft, and made sure that it is tight. I also installed a 42DD 3" exhaust recently. The car has about 96k on it with stock vacuum hoses except for the aforementioned adjustments. I'm pretty sure it's not the hose and DV I replaced because I made sure that they were tight to see if that was the problem, and it did not fix it.
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Don't know if I'm experiencing the dreaded limp mode or not. It seems that SOMETIMES while just digging thru the gears 1-2-3, not hard, when I get to 3000 rpms it's like I'm taking my foot off the gas. Rpm drops from 3000 to 2500. It's like I'm losing boost or something. I have no mods and obviously, no boost gauge.
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I have done a extensive tune up on my intrigue, I have been having a problem last six months or so with it losing rpms while driving, idles fine and only loses rpms while foot is barely on peddle, If I give it more gas jumps up to normal, what may be causing this?
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Over the past couple of days, my wife and I have been noticing that our B6 (2.0 Auto/Tip) is shifting at around 4000 rpms. I'll probably be taking it in to have the dealer look into it but wanted to see if the community has experienced anything similar to the issue at hand.
It shifts (Appox):
1st into 2nd - 3200 rpms
2nd into 3rd - 3800 - 4200 rpms
3rd into 4th - 3500 rpms
4th into 5th - 3000 rpms
5th into 6th - 2500 rpms
Notes:
* the appox amounts above are at regular driving acceleration.
* while in Drive - "D" mode
* used to shift into all gears between 2500-2900 rpms
* doesn't shift nearly as smooth as in the past
Is it OK to slip into "Sport" from "Drive" while Driving? How about slipping into Tiptronic while using "D" or "S"?
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