MitsuStyle

MitsuStyle (http://www.mitsustyle.com/forums/index.php)
-   Turbo / Engine / Drivetrain (http://www.mitsustyle.com/forums/forumdisplay.php?f=91)
-   -   16 Turbo lag (http://www.mitsustyle.com/forums/showthread.php?t=12690)

MYTOYZ 09-01-2006 10:09 AM
16 Turbo lag
 
Sorry, title should read 16G.

Another question for you guys... :)

I've been trying to use the 'Search' but cannot get it to work so I apologize if this has been covered before.

I have a Big 16G turbo and am not real impressed with the turbo lag. I can't get the boost to kick in until the tach swings by 5500 in 1st. By the time I've hit full boost it's time to shift. :eek: Is this normal for a 16G?

Kracka 09-01-2006 10:19 AM
Re: 16 Turbo lag
 
No, you have a serious problem, you should be hitting full street boost around 3000 RPM's. Either your turbo has already walked out the door or you have a serious boost leak.

MYTOYZ 09-01-2006 10:22 AM
Re: 16 Turbo lag
 
Quote:
Originally Posted by S2kracka
No, you have a serious problem, you should be hitting full street boost around 3000 RPM's. Either your turbo has already walked out the door or you have a serious boost leak.
Should I be able to build boost by revving the engine in nuetral? If I stab the throttle from idle I cannot build any boost.

JET 09-01-2006 10:31 AM
Re: 16 Turbo lag
 
Generally no, you need a load on the engine to build boost. Do a boost leak test.

Kracka 09-01-2006 10:32 AM
Re: 16 Turbo lag
 
Quote:
Originally Posted by MYTOYZ
Should I be able to build boost by revving the engine in nuetral? If I stab the throttle from idle I cannot build any boost.
Thats normal, you will only build boost if the engine is under load (i.e. not free-revving).

MYTOYZ 09-01-2006 10:34 AM
Re: 16 Turbo lag
 
OK, thanks guys.

MYTOYZ 09-01-2006 11:20 AM
Re: 16 Turbo lag
 
I think I will buy a Boostpro leak tester. Anyone had any experience with those?

95talonracer 09-01-2006 12:06 PM
Re: 16 Turbo lag
 
I would make one yourself it is cheap and easy. Just either do a search for how to make one or take the measurements of piping on your car and go to the local hardware. good luck.

Elementality158 09-01-2006 12:11 PM
Re: 16 Turbo lag
 
They are so easy to make. Ill get a pic of mine.

MYTOYZ 09-01-2006 01:00 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by Elementality158
They are so easy to make. Ill get a pic of mine.
That would be great, thanks.

sleepydsm 09-01-2006 02:18 PM
Re: 16 Turbo lag
 
boosk leak or f-ed turbo.

MYTOYZ 09-01-2006 02:22 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by sleepydsm
boosk leak or f-ed turbo.
Fingers crossed it's just a boost leak. In the higher gears when it spools up it holds plenty of boost. I would have thought it would struggle under all circumstances with a leak but I guess I'll find out.

CDeutsch 09-01-2006 03:15 PM
Re: 16 Turbo lag
 
Could be an exhaust leak (or the wastegate isn't closing and exhaust is escaping out it) if it's a spool issue.

MYTOYZ 09-01-2006 03:19 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by CDeutsch
Could be an exhaust leak (or the wastegate isn't closing and exhaust is escaping out it) if it's a spool issue.
Thanks, I will check out the wastegate too.

94talonawd 09-01-2006 04:02 PM
Re: 16 Turbo lag
 
Could be a boost leak.

But I highly doubt you will be able to build good boost at 3k in 1st gear.

How is the boost in 3rd gear?

MYTOYZ 09-01-2006 04:06 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by 94talonawd
Could be a boost leak.

But I highly doubt you will be able to build good boost at 3k in 1st gear.

How is the boost in 3rd gear?
3rd - 5th is not too bad. It just feels like a slug in the first 2 gears.

My clutch issue is probably not helping since it chatters if I try to launch over about 1800 rpm so I am not laying into it until the clutch is fully released.

I used to have a 92 Laser RS AWD Turbo and it spooled alot quicker with the stock 14b, that's what I am comparing to.

95talonracer 09-01-2006 04:33 PM
Re: 16 Turbo lag
 
Check the wastegate actuator and see if the shaft going into the turbo didnt slide back making the flap not cover the eitire hole inside the turbo. I have seen this before but i dont know what turbo you have.

94talonawd 09-01-2006 04:51 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by MYTOYZ
3rd - 5th is not too bad. It just feels like a slug in the first 2 gears.

My clutch issue is probably not helping since it chatters if I try to launch over about 1800 rpm so I am not laying into it until the clutch is fully released.

I used to have a 92 Laser RS AWD Turbo and it spooled alot quicker with the stock 14b, that's what I am comparing to.
What are all of your mods?

If it is a boost leak like what some are saying, it would have to be extreme. And If the leak is that big, your car should sputter. Does it sputter under boost?

Check your manifold to see if it is cracked (Most likely it wont be cracked, unless you still have the stock 1g manifold). Also check the four bolts on top of the manifold that holds onto the turbo and make sure they are tight. If they are tight, check the metal gasket that lays in between the manifold and the turbo. My guess that there is a leak somewhere around there, causing air to escape and not spinning the turbine wheel like it should, and causing slow boost build.

I would also consider looking at the wastegate flapper to see if their is a crack on the housing (i highly doubt thier is a crack though, but just incase) causing air to go pass the wastegate and not spinning the turbine wheel like it should.

Check also to see that your wastegate is tight. Not moving freely. Make sure the wastegate flapper is closing all the way.

My .02 cents.

Shane@DBPerformance 09-01-2006 05:39 PM
Re: 16 Turbo lag
 
When does it hit full boost in 4th gear from a 2000rpm roll? 1st gear is going to be very laggy. Some cars can't even hit full boost in 1st gear.

Gravy 09-01-2006 06:48 PM
Re: 16 Turbo lag
 
I had similar problems on my car within the last couple weeks. No spool till 4-5k rpm in first and second was near as bad. Third and fourth seemed ok, spooling up near 3500 ish. My problem was boost leak AND an exauhst leak as well. One inch of gasket missing from my exauhst maifold as well as two studs missing off the passengers side. Soon i hope to have much better spool up after fixing the studs and the gasket.

Elementality158 09-01-2006 06:57 PM
Re: 16 Turbo lag
 
Here it is. You kinda need an air compressor. Or a bike pump might work. not sure.

http://myspace-992.vo.llnwd.net/0111...19941992_l.jpg

The smaller one seems to work better so yeah. Just measure the size of the turbo.

MYTOYZ 09-03-2006 09:40 AM
Re: 16 Turbo lag
 
Quote:
Originally Posted by 94talonawd
What are all of your mods?

If it is a boost leak like what some are saying, it would have to be extreme. And If the leak is that big, your car should sputter. Does it sputter under boost?

Check your manifold to see if it is cracked (Most likely it wont be cracked, unless you still have the stock 1g manifold). Also check the four bolts on top of the manifold that holds onto the turbo and make sure they are tight. If they are tight, check the metal gasket that lays in between the manifold and the turbo. My guess that there is a leak somewhere around there, causing air to escape and not spinning the turbine wheel like it should, and causing slow boost build.

I would also consider looking at the wastegate flapper to see if their is a crack on the housing (i highly doubt thier is a crack though, but just incase) causing air to go pass the wastegate and not spinning the turbine wheel like it should.

Check also to see that your wastegate is tight. Not moving freely. Make sure the wastegate flapper is closing all the way.

My .02 cents.
Mods are Big 16G turbo, Blitz BOV, 3" turbo back exhaust, S-AFCII, Greddy Electronic Boost Controller. I have not had the car long and am not sure if I have any fuel upgrade mods, I need to do a little research into the injectors.

Once the boost builds it does not sputter at all, the boost holds really well and the car pulls.

Thanks for all of your advice here. I will spend a night during the week investigating everything you guys have pointed out.

MYTOYZ 09-03-2006 09:43 AM
Re: 16 Turbo lag
 
Quote:
Originally Posted by Elementality158
Here it is. You kinda need an air compressor. Or a bike pump might work. not sure.

http://myspace-992.vo.llnwd.net/0111...19941992_l.jpg

The smaller one seems to work better so yeah. Just measure the size of the turbo.
Thanks! Are you restricting the pressure on your compressor to get the right psi? I just ask since I don't see a guage with your setup there.

Thanks again, a picture is worth 1000 words...

94talonawd 09-03-2006 02:28 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by MYTOYZ
Mods are Big 16G turbo, Blitz BOV, 3" turbo back exhaust, S-AFCII, Greddy Electronic Boost Controller. I have not had the car long and am not sure if I have any fuel upgrade mods, I need to do a little research into the injectors.

Once the boost builds it does not sputter at all, the boost holds really well and the car pulls.

Thanks for all of your advice here. I will spend a night during the week investigating everything you guys have pointed out.
I would probably look in to the electronic boost controller.

On my 3/s, I had the Blitz dual SBC and there was soo many settings on there to configure and it didnt work out properly. It was causing wierd boost settings and sputtering.

Look at the manual to see if the setting on the boost controller is set properly.

When I had took off the electronic boost controller on my 3/s and put on a manual one. It fied all my car problems.

I dont know if this is a factor involving your problem, but it was for me.

So I would just look into that too.

94talonawd 09-03-2006 02:29 PM
Re: 16 Turbo lag
 
Then again, do that boost leak test. That will answer a thousand questions.

94talonawd 09-03-2006 02:36 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by MYTOYZ
Thanks! Are you restricting the pressure on your compressor to get the right psi? I just ask since I don't see a guage with your setup there.

Thanks again, a picture is worth 1000 words...
Yes, hook that up to the compressor and compress air into that fitting.

Start at a low psi first and work you're way up to say about 18-20. Just look at your boost gauge. Then you should be able to tell if you have any boost leaks.

http://vfaq.com

Go there. They have a lot of information.

MYTOYZ 09-04-2006 12:38 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by ecoli
When does it hit full boost in 4th gear from a 2000rpm roll? 1st gear is going to be very laggy. Some cars can't even hit full boost in 1st gear.
I just tested this twice on a flat section of road and the results were similar both times. From 2k rpm, flooring it takes about 8 - 9 seconds to reach full boost which was set to around 17psi, this happens when the tach swings by 3400rpm. Perhaps that's ok since these cars don't seem to have much torque down low but it's a little frustrating.

MYTOYZ 09-04-2006 12:39 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by 94talonawd
Yes, hook that up to the compressor and compress air into that fitting.

Start at a low psi first and work you're way up to say about 18-20. Just look at your boost gauge. Then you should be able to tell if you have any boost leaks.

http://vfaq.com

Go there. They have a lot of information.
Thank you.

1ViciousGSX 09-04-2006 12:57 PM
Re: 16 Turbo lag
 
A small leak after the compressor or before the turbine can make a big difference in spool up.

Gravy 09-04-2006 09:34 PM
Re: 16 Turbo lag
 
Oh hell yes it does. I replaced my Ex Mani gasket and ported some parts on the exauhst and oh my god. Get that stuff looked into. The car has had an exauhst leak since i've had it. It's like a brand new car now.

Elementality158 09-05-2006 12:19 AM
Re: 16 Turbo lag
 
If you have a boost gauge in the car just have someone watch the gauge while you fill. Fill it to 20 or so. Then watch it drop. If it goes fast, then bad. But if it stays up there real well. Then you have it tight Listen for any leaks, they can be in the weirdest spots.

vertigo210 09-11-2006 08:25 AM
Re: 16 Turbo lag
 
I can relate with a bad boost leak.

1) Check the turbo bolts and gasket (the bolts fastening the turbo to the exhaust manifold). I once had those bolts back out and it was extremely hard to build up boost.
2) Check the upper/lower intercooler pipes (especially at the couplers). I once had the clamp on the lower IC pipe loose and it made it difficult to reach full boost.

Pushit2.0 09-11-2006 11:46 AM
Re: 16 Turbo lag
 
It sounds like the problem is your Vet makes 517whp and 490trq and your DSM would be lucky to make just over 1/2 that. I would do a boost leak test, check all clamps, pcv valve, exhaust manifold bolts, boost controller settings, turbo shaft play. Fuel mods should be somthing like Walbro 255, ajustable FPR, 650cc or similar injectors, SAFC 2, and a FMIC would help.

~John

MYTOYZ 09-11-2006 03:30 PM
Re: 16 Turbo lag
 
Quote:
Originally Posted by Pushit2.0
It sounds like the problem is your Vet makes 517whp and 490trq and your DSM would be lucky to make just over 1/2 that. I would do a boost leak test, check all clamps, pcv valve, exhaust manifold bolts, boost controller settings, turbo shaft play. Fuel mods should be somthing like Walbro 255, ajustable FPR, 650cc or similar injectors, SAFC 2, and a FMIC would help.

~John
lol, the Vette sets the bar pretty high. It's tough moving between the cars that's for sure. I have an unexpected issue with the Vette at the moment so as soon as I'm done with that I will be revisiting this and will be sure to post the results.

Andy


All times are GMT -5. The time now is 02:50 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.