REALLY late full boost

[want_a_gsx]

ever since i bought the 1g eclipse, i have noticed that the turbo doesn't hit full boost until 5-5.3k, starting to spool around 2900rpm, depending on the gear though. i thought this was normal until my gearhead friends drove my car and told me it takes 2,000rpm for turbo to hit full boost

i have no clue why this is happening. there are no boost leaks and the turbo has absolutely no shaftplay whatsoever. any ideas?

 

[1FASTRICE]

What kind of turbo are you running? Bigger turbos than stock tend to spool late...thats exactly how my EVOIII spooled..full at like 5300

 

[Talon-96]

you say to different things there, when do you hit full boost?

 

[Talon-96]

I think you mean start spooling at 2k thats probably normal since the 14b's do spool up slower.

 

[want_a_gsx]

starts spooling at around 2,900 rpm and hits full boost at 5,000rpm; so it takes takes 2,100 rpm to hit full boost from the initial time it starts spooling...

stock 14B

 

[No_Skillz]

No boost leaks? Please explain in detail your test method.

Have you checked for exhaust leaks?

 

[want_a_gsx]

well i didnt really test to see if there are any boost leaks, but there was an obvious boost leak a while back and could only hold 6psi. the upic pipe was loose and we fixed that, so once the turbo hits full boost now, it holds it all the way to redline.

how do you check for exhaust leaks?

 

[brute]

Do a real boost leak test. I'm sure you have leaks.

 

[want_a_gsx]

what rpm does a 14B normally hit full boost?

 

[2gAWDTalon]

What kind of turbo are you running? Bigger turbos than stock tend to spool late...thats exactly how my EVOIII spooled..full at like 5300

Dude, your not running right. Sorry OP, nut I had to say this. You also need to do a boost leak test. I spool a PTE 50Trim to 22 lbs around 3900 rpms, a EVO 3 Spools way faster then a 50 Trim.

BOTH of you need to go here...
http://www.vfaq.com/mods/ICtester.html
Do not post again on this subject untill you have completed this test. You need to boost leak test once a week.

 

[bmwisthekey]

what rpm does a 14B normally hit full boost?

3500 rpms +/-, A good way to check for exhaust leaks ( pre turbo) take your heatshield off your exhaust manifold, and run some seafoam or equivalent thru the intake manifold while the engine is running it will smoke out wherever the leak is if there is any, i.e.( leaking exhaust manifold gasket, manifold to turbo gasket, cracks in the manifold or turbine housing)

 

[2gAWDTalon]

what rpm does a 14B normally hit full boost?

A 14B should be able to make 10 to 14lbs around 3000 rpm's
A fricken EVO 3 will make like 20 lbs way before 4000
My PTE 50 Trim makes 22 lbs before or at 4000
Edit: I just remebered I have 9.1:1 C.R., I guess that is relevant, sorry.

 

[Spooling99]

Check your manifold for cracks and also do a proper boost leak test

 

[want_a_gsx]

if 14b hits full boost by 3-3.2k, when does it
generally start spooling in 1st,2nd, and 3rd gear?

mine starts spooling 2900rpm in 1st/2nd

 

[Spooling99]

The 14b should start to spool around 2k and hit full spool depending on what that is by 3200. Check for pre turbo leaks.

 

[1FASTRICE]

I have done about 4 boost leak tests on my car this summer... there hasnt been any leaks yet.. and yes i do know how to boost leak test and my car is fine... just not tuned, thats all

 

[want_a_gsx]

well there is a nut missing from the manifold, where it attaches to the motor. you can also see a lot of build up around it and when you put your hand by it, you can feel gas rushing out...

but i think my main problem is that there is a dead cylinder. this has been confirmed by two shops. would this cause the turbo to underperform like this?

 

[andymoraitis]

Any exhaust leak before the turbine will kill spool. If you can feel air rushing out at idle, imagine how it is at wide open. Get that fixed right away. As far as the dead cylinder, do these shops mean completely dead as in zero compression or failing as in low compression?

Get yourself a compression tester and see for yourself.

Let us know what you find,

Andy

 

[want_a_gsx]

the first shop did a compression test without even telling me and charged me of course.
they found 150, 0, 25, 75.

the owner of the second shop called me and told me " the car is running like crap. you can tell one of the cylinders is shot."

i did buy a compression tester a month ago, but then realized that i didnt have the tool to remove spark plugs.

 

[95TalonOwner]

the first shop did a compression test without even telling me and charged me of course.
they found 150, 0, 25, 75.

the owner of the second shop called me and told me " the car is running like crap. you can tell one of the cylinders is shot."

i did buy a compression tester a month ago, but then realized that i didnt have the tool to remove spark plugs.

Just get a freakin socket for the plugs. Its not that hard. Yes a dead cylinder would cause your late spooling. You need to fix your motor before you start worrying about turbo problems.

 

[want_a_gsx]

ok so what do i do next? how do i know what to fix?

 

[dieseltech]

wow. I'm suprised you could get the motor to turn to 5k or more. I had a dead cylinder on mine and couldn't get it to go anywhere. I myself would do this. Remove the spark plugs and check inside the cylinders with a pen light to see if a valve has dropped. This actually happened to me and i'm still stumped to as why. If you don't see any valves lying on top of or in the pistons I would pull the Camshaft gear cover. Inspect the belt too see if may have jumped timing. Unplug your MPI fuse and crank the engine briefly and inspect the teeth. If you find missing teeh you can bet the timing is off. With a cylinder showing 0 compression there is a good chance your belt slipped and the pistons and valves met in a bad way.
I would then remove the valve cover and inspect the cam lobes and valves. Look for possible broken springs and rocker arms. If you cannot find anything visually wrong then perform a cylinder leak test. You can buy an adapter at a parts store, or even rent one. Bring the cylinder to top dead center on the compression stroke. Install the tool and have an airsupply that can provide at least 50psi. You should hear air whooshing in either the intake or exhaust. If it starts coming from the engine crankcase, your piston has had a hole melted in it.
If you have any ?'s feel free to ask! hope this helps you get your car fixed.

 

[want_a_gsx]

alright well i will try to do a compression and leak down test myself, as well as check for jumped timing, missing teeth and damaged valves.

hopefully i can do all this this weekend, save up money and fix the damn problem. i'll let yall know what i find. thanx

 

[Ultimatedsm]

my 14B with a 3 inch exhaust and FMIC side to side endtanks with 2.5 inch piping hits full boost at 2800-2900 RPM. I noticed a little more lag after the FMIC, but I can run higher boost without high intake temps.

A dead cylinder will cause spooling problems for sure. your compression is horrible and needs to be checked. Do a dry test and than a wet test. If your see an improvement with the wet test, your rings are screwed, if not, its your valve seals.

 

[donmagicjuan]

Don't bother checking the valve timing. It's impossible for improperly timed valves to only affect some cylinders. As Ultimatedsm stated, it's either the rings or the valves in the problem cylinders, or the head gasket. Although I think you would be having bigger problems than late spoolup with a head gasket blown out enough to give you zero compression.