Cant build boost with my stutterbox

[tsitalon03]

Whats up guys...iight so my stutterbox is set a 5 grand and when I use it no boost builds up....but it launches just fine. I keep hearing ppl say they build 5 10 15lbs....so why cant I? I dont have any boost leaks...well no major ones. I need some feedback asap

[kahl23]

Stutterbox does not mean antilag, all it is is a secondary rev limiter that is either speed or clutch dependent, that means it doesn't put that much load on your engine, which in turn means your turbo wont spool that much. If you aren't building even a little boost, try maybe raising it to 5500, see if that does the trick, or you could always try letting the clutch up a bit while tapping the brakes and flooring the gas with your right foot, kinda like heel-toeing, but that will kill your clutch fairly quickly. That adds load to the engine, but, like I said, isn't friendly to your clutch, it will, however, preload your drivetrain and make the launch easier on your driveshafts/differentials/transfer case.

PS-When you say no "major" boost leaks, where are you leaking? TB shaft seals?

[turboglenn]

A 2-step won't build boost like a anti-lag or NTLS switch can, but if you're holding the gas pedal to the floor you should get at least a couple pounds or so built up. I can build about 3 psi on my rev limiter with a somewhat big garrett 57 trim

[tsitalon03]

Yea just a minor leak in the TB...the pedal is on the floor at 5 grand but nothing...awww well..would a maf-t help?

[turboglenn]

No, a MAF-T won't make a difference in spooling your turbo at all. What you really need to build boost is something that will add fuel and retard timing like DSMlink or some other programmable ECU/EMS

Are you sure your wastegate flapper/arm assembly is sealing shut when your not under boost? if the flap's open just a bit that could cause the loss of any spool on teh 2-step. It would also cause a later spool in the turbo in general. What RPM do you hit your peak boost at and what is your boost set at?

[tsitalon03]

The turbo spools up pretty quick...i have no problem with that..right now i'm at 20psi and I get there at around 6 grand or so but i'll check the wastegate flapper tomorrow

[turboglenn]

Originally Posted by tsitalon03

The turbo spools up pretty quick...i have no problem with that..right now i'm at 20psi and I get there at around 6 grand or so but i'll check the wastegate flapper tomorrow

WHAT??????? Your profile says you have an Big-16G, that thing should be making a full 20 psi before you even get to 4k RPM (even being clipped it should spool way sooner than 6 grand) , hell it should probably spool by 3500. If it seriously takes you until 6k to hit 20 psi you have MAJOR issues with your turbo and or it's wastegate and that would be why you can't get ANY boost on your 2-step

Get back to me on this one, because that sounds way, WAY wrong to me.

[kahl23]

Originally Posted by turboglenn

WHAT??????? Your profile says you have an Big-16G, that thing should be making a full 20 psi before you even get to 4k RPM (even being clipped it should spool way sooner than 6 grand) , hell it should probably spool by 3500. If it seriously takes you until 6k to hit 20 psi you have MAJOR issues with your turbo and or it's wastegate and that would be why you can't get ANY boost on your 2-step

Get back to me on this one, because that sounds way, WAY wrong to me.

+1 16G variants, even big, clipped ones should never make peak boost anywhere over 4k, and even then would be laggy, if you're seeing boost at 6k something is very wrong, either a broken wastegate, a massive exhaust leak, or a dead turbo.

To test the wastegate make yourself a boost leak tester with a simple pressure gauge and then slowly pressureize the system, watching the WG actuator arm. Note what PSI it opens at. If the wastegate is broken it should pop open almost immediately.

An easy way to spot an exhaust leak would be to seafoam your engine (search it, there are plenty of threads) and then look for white smoke blowing out in the engine bay, if its bad enough to make a 16g spool by 6k then its probably a fairly large leak pre-turbo. Also, seafoaming an engine that hasn't been cleaned in a long time is just a good idea.

Finally, if neither of those tell you anything, take off your intake pipe and check the compressor wheel for shaft play, although if the shaft play were bad enough to be causing these problems then your turbo would probably also be eating through oil like it's its job and you'd have a nice little smokescreen anytime you went WOT.

[turboglenn]

Also, the wastegate could be fine, but hanging open a bit so check and see if you can close the flapper arm any further in teh closed direction. You may have to remove the actuator to see, but anything's worth finding out why you've got such poor spool performance from a 16g

[BrokenTsi]

I dont see any boost at 5k on a 2-step. I launch at 6500 and see maybe 5 psi. Any less, car falls on its face. (t-67)

[tsitalon03]

Well i just got back i took the car for a spin.....yea i was waaaay off ha..20 psi hit at 3700..i guess i never actually noticed....but yea the turbo is fine

[tsitalon03]

But if you arent supposed to build boost with a 2step i guess the car is fine....for some reason i always thought you were supposed build boost i heard ppl do it but i guess it was the anti lag or nlts

[Black_Bullet]

Originally Posted by turboglenn

No, a MAF-T won't make a difference in spooling your turbo at all.

I beg to differ, I just got my maft setup and my turbo IS spooling faster.
Im not saying OP should get one for this reason but just thought id add that in.

Originally Posted by tsitalon03

But if you arent supposed to build boost with a 2step i guess the car is fine....for some reason i always thought you were supposed build boost i heard ppl do it but i guess it was the anti lag or nlts

Something is wrong there, if you only have a 16g.
Honestly my car builds at least 11-12lbs every time I do my 5500k stuttarbox.
But im open DP also with a couple other things that help my turbo out .....

[tsitalon03]

Yo how do you build so much boost? What do you mean when you say open DP

[xveganxcowboyx]

He means his exhaust ends at the downpipe. Nothing beyond it. The lack of back pressure will help the turbo spool easier.

[tsitalon03]

Something is wrong there, if you only have a 16g.
Honestly my car builds at least 11-12lbs every time I do my 5500k stuttarbox.
But im open DP also with a couple other things that help my turbo out .....

So if you had a turbo back exhaust you wouldnt build that much boost would you?

[DiamondStarAwd]

I was building 10 lbs of boost ~ 5500 rpm studder on a to4b 50 trim and I could get ~ 14 lbs out of a 16g.

[mitsu93gsx]

I have a msd dis2 And I stutter of it and usally builds around 10-12 psi when launching, but i might be using a tottaly different system then you

[tsitalon03]

wierd....half the ppl here say you arent supposed to build boost using a 2step...the other half says they are building boost. the guys that are building boost...do u guys have a maf-t?

[SpeedAddict62]

Originally Posted by tsitalon03

wierd....half the ppl here say you arent supposed to build boost using a 2step...the other half says they are building boost. the guys that are building boost...do u guys have a maf-t?

I can build close to 10 psi on my small 16G with 5500 rpm 2-step. However, I also retard the timing slightly (custom EPROM), not sure how much that helps. Either way, as mentioned earlier, a MAFT isn't going to make a significant difference and you shouldn't base anything on whether someone has one more or not. You should make sure that there are absolutely no leaks, exhaust leaks, or anything else that would hurt spool and focus on that.

[DiamondStarAwd]

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