So my car sat for a few years and I decided to replace the turbos when I put it back on the road. My idle since putting everything back in has been around 1,800 and I've found that I can get full boost instantly in any gear at low-low rpms. I think the two could be related and I was wondering if anyone could think of why.

Ideas welcome. Can provide more input as needed.

Thanks guys and gals!
~Travis

 

Wow. If you figure out what instantly gives you full boost at low rpm in any gear, let me know what it is. I'd like to hook that up.

 

What's too early?
What boost level?
What turbo?
Motor specs?
Etc.

 

'01 turbos, on stock block, w/ exhuast, power fc, greddy smic, efini y-pipe

If u are in 5th at 1,800 rpms and hit the gas, it will develop .75 bar isntantly, long before 2,500, let alone 3-3,500 where it should. It should follow stock boost patterns.

 

Sounds like your turbo's are working correctly to me.

3-3,500 normal? Your not running a single turbo dude.

thewird

 

That is why stock twins are awesome! Great for the street and short courses at moderate HP levels.

 

There's no way the stock twins should make full power under 2,000 rpm...

 

I know there's a problem, so besides telling me it's good, I'm open to ideas.

 

My knightsport twin sequentiel are full boost between 2300-2700rpm so not a problem to me

 

If it is an abnormal issue, I don't think there's a single person on this forum that would consider it a problem.

My guess is the following: Since your idle is so high, there's a good amount of air flowing before you ever step on the gas compared to having a normal idle. This means the turbos will be spooling more without you having to step on the accelerator. So once you do step on it, the turbos will seem to come on quicker.

Bottom line, once you fix the idle it should all feel normal again.

 

How is developing full boost at 1-2k and not having it last till redline, not an issue? rofl... w/ any type of stock twin setup, I know they aren't suppose to spoil so quick. They're getting red-red hot and prolly overheating from being worked to hard too soon.

I'm asking more for input from people who may have been experiencing a similar issue, rather than people thinking full boost at the moment you hit the gas at any moment is good or right in this situation. If you have had any similar issues, please let me know. Otherwise I don't need your input guys, it's not helping.

 

Try the test in 3rd gear. If you are still sequential and have the car in 5th gear and hit the gas around 1100 rpms, it really is normal to see 10psi of boost by 2000 rpms. The factory sequential spools extremely quickly. A more common test would be done in 3rd gear where it doesnt take as long to go through the rpm range.

Posting a video would help, but if all this info is coming from a 5th gear pull it sounds normal. The reason the boost isnt holding to redline is because you have a typical 2nd turbo control issue in the sequential system somewhere. Extremely common problem.

 

This is on the list of problems I want to have.

-Geoff

 

Not trying to flame you here OP. You need to first state clearly of your problem and not describe it half way. When someone tells you it is "normal" because you didnt describe correctly. People here are nice enough to help. Dont be a jerk. If you start acting like an @$$ here, soon people will just walk away from you and I guaranteed you.

As Djseven mentioned, the turbo kicking at full boost around 2k rpm is definitely normal, yet lacking power after transition is a problem. And his description to your problem is a typical 2nd turbo control issue.

Is this "lack of power" intermittent or does it happen ALL the time?

-AzEKnightz

 

check your leading coil, when mine died and my car was running on trailings only I had very high EGTs and the twins boosted too fast but it felt low in power

 

At AZ, my description isn't incorrect just because it lacks everything and it's mother. You're rude for telling me how to act, and calling me an @$$. I'm asking for constructive help, not responses that just fill the forum as fodder, saying people want overheating glowing turbos. Obviously I'm having an issue if I'm posting asking for help.

I knew I would need to add more info. Figured someone who might had seen a similar instance would ask for more information. And maybe add more information. There can be a thing as too much information w/ turbos, so I figured I'd start w/ what I thought was most odd.

I'm pretty much looking for input from people who have experience w/ a similar issue, and not input which say everything's fine and normal, or rude comments. Please people, if you don't know or have any clue, just read and learn... Can add more info as needed.

It's not a lack of power so much as the turbos overboosting till they overheat and glow and click. The primary will try to boost instantly w/o any spoil in any gear all the time. I was using 5th as an example because in the past when everything worked properly boost would slowly build up. The secondary opens up at 4,500 perfect every time and seems to add what it should so I don't think there's any issue w/ the secondary... The lack of power is more like the primary can't add what it needs to the secondary to maintain full boost.

I know there should be some lag in response, cause when it work fine, there was. If I work 3rd, it seemed to be fine if I'm nice to the throttle, but if I just hit the gas it'll full boost instantly. I have 0 spoil time whenever I ask for boost, like they're always spoiling no matter what.

Towards the coil idea, did you hear a noise coming from the area in conjunction w/ it? Cause I may be hearing a click or howl from near the throttle body. Think I'll definitely start thinking maybe that route.

Also read that the primary turbo inlet leaking could cause this?

Relevant comments welcome!
Thanks as always!

 

Trust me, if I am rude, I will be flaming your *** hard. I've been here for quite sometime, helped many through diagnosis and teaching them how to diagnose.

What I saw early in the thread was totally giving attitudes that was NOT needed. You didnt start stating the fact that it is lacking power after boost until post #11. Please re-read any post above #11, you simply telling others to butt-off when they say it is NORMAL because of your lack of description.

Yet you came back with an attitude is hence I recommended to tune it down, humbling asking and giving additional information. That is NOT rude, most like an advice to survive in the forum before it gets too out of hand. (When I say don't be an ***, is not calling you an *** more as do not go that way advice, I apologize if that gave you any misunderstand)

Therefore I will back off on this thread and good luck solving the problem.

-Cheers,
AzEKnightz

 

I didn't hear any noises or anything that would indicate any problems other than a somewhat different exhaust sound.

The turbos were boosting really fast even at low throttle openings, overboosting and my EGT gauge was reading significantly higher than usual. Still with the faster and higher boost the car felt low in power which was very odd.

I troubleshooted for leaks, checked the water injection and spark plugs, and couldn't find the problem. Did a compression test and it was fine and finally decided to check the coils and the leading was dead. Got a new one and problem fixed!

 

Well, you initially left out the part where the boost didn't hold till redline. If you're getting quick spool, then can't hold till boost, and turbos glowing, I'd bet on a clogged cat or similar.

 

AZ, this just in, you were being rude, just cause you're aren't flaming hard. It took to post 11 because because of useless stuff like this. Any attitude was simply towards peoples "i want this problem comments". They've all I've been getting and help nothing. You can roll the way you want, but don't tell me how to act. It's not your place. Been on the forums here just about as long and never have had any issues with anyone till you right now. Thanks for moving on!

 

When it's cold it will hold. When they start to glow, everything becomes random. It's got a high-flow random tech cat, would it clog?

 

Getting overboost too so I think I'm going to dig into the coil packs.

 

boost creep (overboost) especially in cold weather, not holding boost till redline, and higher EGT's possibly caused by excessive backpressure can DEF be caused by a clogged cat.

at the same time, too little backpressure w/ the stock wastegate's can also cause creep but this doesnt qualify for your scenario.