sputering question

[91gsdohc]

i was looking at a 91 talon tsi awd he said the only thing he did with the car was put a bigger turbo in (dont know what kind just a bigger one) and he said all needs is a fuel regulator........because he says when he gets to high rpms the car sputters and it need more fuel i was jw what the truth is behind that before i buy the car

 

[dawid4444]

Heyy
Do you know how many psi it is pushing ?

You can have big ass turbo and set the MBC to stock boost levels.
So what he is saying is not true.

it is sputering from diffirend reason .

but give as list of mods of this car
is it have full exhaust on it ??

 

[coryd21]

That sounds legit, I know on my 14b at 5k rpms mine would start to sputter real fast and wouldn't pull very hard past 5k, so I did a simple re-wire on the fuel pump " which is real simple to do " and that fixed my sputtering problem at higher rpms.

Now depending on how much bigger the new turbo on that car is you may need a AFPR, but I would try the fuel pump re-wire and see if that works for you.

 

[91gsdohc]

for the list of mods go all he said he did to the car was put a bigger turbo in it from the picture it looks like there just a new muffler thats it im going to look at the car later today but i just wanted to know if it was worth check out .....( btw i know nothing bout turbos ) heres the ad 91 Eagle Talon TSI

 

[coryd21]

I would definitely try to talk him down just b/c but if that is the only problem the car has for 2k or less I don't see that being a bad buy.

I would drive it, check for any visible leaks, see how the fluids look, check to see if it smokes, just give it a good look over.

 

[91gsdohc]

I would definitely try to talk him down just b/c but if that is the only problem the car has for 2k or less I don't see that being a bad buy.

I would drive it, check for any visible leaks, see how the fluids look, check to see if it smokes, just give it a good look over.

niether do i thats y im cheacking here to see if what he told me checks out and another question he said that only happns in high rpm so if i keep it at low rpms till i can figure out and fix the problem should i be fine if i keep it low rpms

 

[coryd21]

Yea keep out of high boost and high rpms and you will be fine. Like I said before I only had that problem when I was trying to do a full 3rd gear pull to 6k, but other than that mine ran just fine.

When you test drive it you will be able to see how it drives. See how much boost its running b/c I was having that sputtering problem on 13 psi until I re-wired my fuel pump.

 

[91gsdohc]

Yea keep out of high boost and high rpms and you will be fine. Like I said before I only had that problem when I was trying to do a full 3rd gear pull to 6k, but other than that mine ran just fine.

When you test drive it you will be able to see how it drives. See how much boost its running b/c I was having that sputtering problem on 13 psi until I re-wired my fuel pump.

im sorry if i sound stupid right now but i just look at the boost gauge or what?

 

[concept4g63]

You could check the gauge but it isn't as accurate as aftermarket ones. I'm guessing he doesn't have an aftermarket boost gauge? If not no other way to see how much psi its at

 

[91gsdohc]

the boost gauge would tell you what ## running at that moment tho right? how would i know what its been set at?

 

[gpopppa]

I would first, look over the motor, wires, oil leaks. could be a simple plug issue. Also, ask if he has done a timing belt on it. When i first got my tsi,it was sputtering and cutting out at around 4500, changed the plugs and no sputtering.

As for the boost gauge, I know alot of people say its not as accurate,which is true,but it is almost accurate. it doesn't have the extra lines to account for the single psi's but if you just double what it says,thats about where its at. I have a Auto meter procomp gauge,and the stock gauge is maybe 2 psi off.

Basically the info you need is with the seller, ask him how long hes owned the car,and if he has receipts for stuff done to it. Its hard to actually get into what could be wrong with it without having it. Talk him down to 1500. it could need more then just the sputtering issue figured out. But definitely go over the engine, SMELL for cleaning fluid just because if the motor is really clean, then there must of been oil leaking from somewhere. check the wire connections to everything. Look for broken wires, shoddy connections motor mounts(not sputtering issue but). Good luck and let us know what you decide. More people need to save our talons, there becoming extinct!!!!

 

[91gsdohc]

I would first, look over the motor, wires, oil leaks. could be a simple plug issue. Also, ask if he has done a timing belt on it. When i first got my tsi,it was sputtering and cutting out at around 4500, changed the plugs and no sputtering.

As for the boost gauge, I know alot of people say its not as accurate,which is true,but it is almost accurate. it doesn't have the extra lines to account for the single psi's but if you just double what it says,thats about where its at. I have a Auto meter procomp gauge,and the stock gauge is maybe 2 psi off.

Basically the info you need is with the seller, ask him how long hes owned the car,and if he has receipts for stuff done to it. Its hard to actually get into what could be wrong with it without having it. Talk him down to 1500. it could need more then just the sputtering issue figured out. But definitely go over the engine, SMELL for cleaning fluid just because if the motor is really clean, then there must of been oil leaking from somewhere. check the wire connections to everything. Look for broken wires, shoddy connections motor mounts(not sputtering issue but). Good luck and let us know what you decide. More people need to save our talons, there becoming extinct!!!!

thank this was really helpful so i just double what the gauge says? and is there any supporting mods that should of been done when droping in the bigger turbo? and i am here to save the talons

 

[GRAVEDIGGER]

As for the boost gauge, I know alot of people say its not as accurate,which is true,but it is almost accurate. it doesn't have the extra lines to account for the single psi's but if you just double what it says,thats about where its at. I have a Auto meter procomp gauge,and the stock gauge is maybe 2 psi off.

The factory boost guage is an electrical estimation made by the ecu and there's no way you can just say to double it and it will be about right. The only way to know exactly what boost a given engine is producing is to have an aftermarket boost guage run off of actual manifold vacuum/pressure.

 

[coryd21]

There are a few things to look into when "dropping" in a bigger trubo.

1 - How much boost are you wanting to run? If you stay between 13 - 18psi you shouldn't have any worries. The stock bottom end and head gasket can handle more, but I like to play it safe.

2 - Can the internals and the head gasket handle the boost?

3 - I would suggest a wide band o2 sensor and Air/Fuel gauge, boost gauge, and oil pressure wouldn't hurt.

4 - I would look into getting dsm link or some type of engine management.

These are some things that you need to look into when going to a bigger turbo.. Well they are good to have even if it was stock.

I would make sure the go through the car and check all fluids and change any that need it. Check plugs and wires. Look for any leaks, pretty much make sure the car is solid to drive before going ahead and trying to make power out of it.

 

[91gsdohc]

i couldnt look at it today so ima go tomorrow and i tried to offer 1500 he said no so went to 1700 ill get it tomorrow if no one offers more then its mine =)........ and he keeps saying the only thing wrong is that it need a fuel regualtor because he put in a bigger turbo and it needs more gas???..... so the question would come to what regulator should i get? any body have the stock regulator with a bigger turbo???

 

[coryd21]

Well im running the stock fpr on 18psi on a 14b

 

[91gsdohc]

Well im running the stock fpr on 18psi on a 14b

ok and what the size of the stock turbo? and if its not the FPR any other ideas what it could be..... could it be that the exahust is too small??.............and again im sry i know its hard to find something out without having all the info on the car and the exact details of whats going on



AND COULD BE IT JUST NEEDS BIGGER INJECTORS?




AND DOES IT SOUND RIGHT THAT IT NEEDS A IMA SAY ?"BIGGER" FPR?

 

[GRAVEDIGGER]

It would be really nice to know WHICH bigger turbo is on the car, but since you don't know we'll just speak in general. Generally when you add a bigger turbo you need a way to tune the car for the bigger turbo as well as being able to get more fuel to support the extra air the bigger turbo is making. Usually with the addition of a bigger turbo I like to see a bigger fuel pump, bigger injectors, and an adjustable fuel pressure regulator for the fuel side of things. Like I say though, it also usually requires some sort of tuning ability to control things like injector duty cycle and timing.

Hopefully this helps explain a little bit of what you need to be looking at.

 

[91gsdohc]

It would be really nice to know WHICH bigger turbo is on the car, but since you don't know we'll just speak in general. Generally when you add a bigger turbo you need a way to tune the car for the bigger turbo as well as being able to get more fuel to support the extra air the bigger turbo is making. Usually with the addition of a bigger turbo I like to see a bigger fuel pump, bigger injectors, and an adjustable fuel pressure regulator for the fuel side of things. Like I say though, it also usually requires some sort of tuning ability to control things like injector duty cycle and timing.

Hopefully this helps explain a little bit of what you need to be looking at.

yes this helps and the 1st question i asked him when he said he put a bigger turbo in i asked what turbo he put in and he said he didnt know what it was it was just one lieing around or something like that.. will the turbo say what it is? and when looking at it how can i be sure its not the stock? and if i drive the car like this for a while will it be fine if i dont boost high rpms?

 

[coryd21]

You can look on the compressor housing and there should be a stamp, or some sore of tag that will say what kind of turbo it is. If you could take some pics of the turbo we could probably help out more.

If that car is having the same problem my gst had then yes you can drive it like that until you can get tuning software and supporting mods just don't trying racing or running high boost at high rpms

 

[GRAVEDIGGER]

Yeah, if you can get a picture of the compressor cover AND the compressor wheel we should be able to tell which turbo you have.

 

[91gsdohc]

thank so you all think thats a good buy 91 tsi 127k for $2000

 

[coryd21]

Yea its not a bad buy at all. Just look it over very well and get some pics up here asap and we can help you tons more

 

[91gsdohc]

yeah deff gunna get some pics up if i buy it because im new to the turbo game but not the dsm game and i dont want to mess up the car over something stupid and little that was small but turned big to to neglect

whats up guys just got back with the car the trubo says TD05H he said the trubo was 16g evo and the car acts up when the stock gauge is at 7 and it dont pass 7 at all.. the best way i could discribe the action of the car is similar to when you dont clutch right coming out of 1st i will get some pics up tomorrow when its not dark


oh and i paid 1700 with no windshield wipers and craked windshield

heres a picture of the turbo thats the best i could do <a href="http://www.flickr.com/photos/50529416@N08/5531770427/" title="IMG00073-20110316-1107.jpg by letsgetwasted, on Flickr"><img src="http://farm6.static.flickr.com/5180/5531770427_58714647c8.jpg" width="500" height="375" alt="IMG00073-20110316-1107.jpg" /></a> and he also threw in a fuelpump and 780cc injectors

ok so i took off the spark plug cover and found a whole bunch of oil wiped it down and found a piece what felt like putty and took it off to discover a crack and was wondering if 1. that could be the boost issue and two if i can just weld the crack and be fine and 3 if that could be the cause of high NOx emission readings thanks

 

[coryd21]

ok so i took off the spark plug cover and found a whole bunch of oil wiped it down and found a piece what felt like putty and took it off to discover a crack and was wondering if 1. that could be the boost issue and two if i can just weld the crack and be fine and 3 if that could be the cause of high NOx emission readings thanks

1 - I would do a boost leak test b/c if you have a bad enough boost leak it could cause your problem.

2 -

3 - High NOx emissions is created when the cylinder temperatures exceed 2500 degrees Fahrenheit so that would lead me to believe that in fact you are having a lean issue and not a boost leak. The 16 has a higher CFM capability over a stock 14b so you are probably having Lean misfires. Check the spark plugs and see what condition they are in and look into re-wiring the factory fuel pump.

This is the link that will show you how to re-wire your fuel pump.

2G DSM FWD Fuel Pump Rewire Instructions


I would also get a boost gauge and a MBC so that way you know what boost that 16g is running.