stutter box but no boost

[njc1064]

Hahaha, this is something that seems to baffle all of us. I also thought that i should see some type of positive pressure reading when using the two step. Now, if only i had a solution...

 

[sbiggi]

Sounds like the cam timing is off. Make sure your timing marks line up correctly.

 

[njc1064]

I checked the timing via timing light with the timing grounded through dsmlink. Car was at operating temperature and the timing was at 5* BTDC

 

[CanadianTSi]

This got me curious.

I checked an old random log from the track. Stutter Box at 5750, engaged for about 2.3 seconds and showing 9.4psi on the 3.3Bar. This is on a Non BB 35R.

 

[kahl23]

Ok then my 3052 numbers seem much more normal, if not even low. Weird stuff

 

[sbiggi]

I checked the timing via timing light with the timing grounded through dsmlink. Car was at operating temperature and the timing was at 5* BTDC

Not ignition timing. Make sure the physical timing marks line up correctly. They can be off a tooth and you can still set the ignition timing.

I'm at 6000' with a sc61 and I make 5psi on the stutterbox.

 

[njc1064]

I will have to verify cam timing, but if i remember correctly, it was perfect. I was considering the waste gate (internal) maybe being stuck open, but after running some air through the wastegate line, it seems to move freely and without hangup (although i cant be sure that it is actually fully closing with it on the car). Also, i was considering the possibility of a bad turbo, but i have yet to see any signs of this. The car pulls hard, doesnt smoke and i havent felt any shaft play, so i dont know if this is an option to consider.

On a side note, although i havent driven the car much, im only running wastegate pressure (as the clutch and transmission are new). Ive noticed that it reads at about 12psi...Isnt wastegate pressure suppose to be around 9psi?

 

[GS-T_Newboost]

my buddys 1g awd wit a 20g with the studder set at 4750 and 5500 makes the same amount of boost when useing anti lag. with the anti lag turned off it makes 3psi of boost. with it turned on he makes around 14psi. i am thinking anti lag is a big part of it. you setting your studder at 5500 is just like you reving your engine, your not puting it under a load to build boost. anti lag just adds unburnt fuel into the studder that explodes in the exhaust houseing that spools the turbo mad.

 

[T9S1i]

my 16g setup used to make 12-15psi with the stock exhaust housing. When i put the BEP housing on there it was about 9-10psi. 5500rpm dsmlink studderbox.

 

[andy4g63]

my buddys 1g awd wit a 20g with the studder set at 4750 and 5500 makes the same amount of boost when useing anti lag. with the anti lag turned off it makes 3psi of boost. with it turned on he makes around 14psi. i am thinking anti lag is a big part of it. you setting your studder at 5500 is just like you reving your engine, your not puting it under a load to build boost. anti lag just adds unburnt fuel into the studder that explodes in the exhaust houseing that spools the turbo mad.

Then why use 2 step t all? Why don't you rev the car without it ??? Wrong...

The 2 step, or so called stutter box, cuts fuel and ignition, which creates strong and very fast impulses and they help spool the turbo and create some boost.

While the anti-lag retards the timing, which alows the AF mixture to be burning with exhaust valves open and this way spools the turbo and builds boost.

On the rally cars, they used anti-lag, even between shifts and aome long time ago, they also didn't have today's computers and stuff, so there were able to inject raw fuel into exhaust manifold, having it ignite and keep the turbo spooled.

Between these two methods anti-lag is more powerfull / as much as twice /, than 2step:
for example instead of 7PSI you would be running 14PSI or so at the line, of course depending on your setup and supporting mods. Anti-lag is much more harsher on valves, turbo and whatnot, that is why may most of the guys are using 2step.

 

[Black_Bullet]

And to add to that, anti lag only helps if you can actually HOOK with it.
On street tires, with that much boost off the line, its easy to blow thru all fours with a 300+ awhp AWD dsm out the hole.

 

[slowgsr]

with my aem and my 2step setup properly i could build 14-15psi off the line at 4300rpm, this is with a T3/60-1.

Using the anti-lag was just too aggressive and was building 20psi +.

 

[mitsuclipsegsx]

With my 2step I got 10psi, with antilag, i see 20psi.

 

[chavez408]

My evo3 is set to launch at 6k with 10psi off the line.

 

[andy4g63]

with my aem and my 2step setup properly i could build 14-15psi off the line at 4300rpm, this is with a T3/60-1.

Using the anti-lag was just too aggressive and was building 20psi +.

That proves my point.