WTF? im building mad boost in neutral!?! [Merged 12-7]

[98TsiAWD]

I want to test my pcv valve under boost. Is there anyway I can get the turbo to boost by reving the engine under the hood?

I recently blew out my dipstick, I did a leakage test and my intake valves are sticking open a little so that would mean boost is getting in there when it shouldnt be right? Causing excess crankcase pressure.

My valve cover breather works fine, I pulled the pcv valve, I can blow through it easily, I also pulled the hose that goes from the pcv to the intake. I make sure it and both fittings where not clogged.

So, basically i want to have the engine under boost just for a second to see if the pcv blows off excess crankcase pressure. But being as there is boost in the intake that will keep the pcv from opening wont it? So my intake valves sticking open is what is causing excess crankcase pressure?

 

[candela]

 

[DevilSperm]

we swapped a 4g63 into a mirage and put some custom exhaust on it...2.5" i believe and it builds 9 lbs just sitting there.

 

[kpt4321]

Originally posted by candela
Stutterboxes (ign. related) will usually creat more of a load.

Ignition only (MSD) will build more boost then something like an EPROM stutterbox, because the ignition does not cut fuel (so the fuel still injects, and blows up in the manifold).

That your car kpt?

Yessir.

http://users.wpi.edu/~ktarry/files/adjstutter.mpg

Woot woot.

 

[DSMJim]

OK, since were posting video i'm puttin some of mine up ...

My Stutterbox, Right Click Save As... - You can really hear it here, death to VW

Another Stutterbox Launch, Right Click Save As... Bit more quiet here, squeel all 4.

 

[doug]

Won't the AntiLag feature in DSMLink V2 help you build boost at the line? I personally don't have to worry about that since I can just powerbrake the A/T.

 

[Jasper16g]

I was thinking the same thing Doug. I am in the same boat as you with the A/T though. Only problem is I CAN'T spool my turbo by braking, so I was going to mess around with it and see if I can get it too help any.

Jason

 

[evotuner]

http://www.angelfire.com/ak5/evotuner/aemems2step.mpg
My cousin (second car in vid) building 20psi on the ems, yes it is possible.

 

[kpt4321]

Originally posted by evotuner
My cousin (second car in vid) building 20psi on the ems, yes it is possible.

Oh yeah, no problem. My car builds 25 psi at 4500 rpm stutter with quasi-anti-lag (timing retard).

 

[DSMJim]

Originally posted by evotuner
http://www.angelfire.com/ak5/evotuner/aemems2step.mpg
My cousin (second car in vid) building 20psi on the ems, yes it is possible.

Damn thats crazy the second car.. I have not got my EMS setup yet but I sure hope it does that ... My stutter is via MSD right now. In a month I'll post a video of stutter with AEM on my car and see if it's crazy ass like that...

 

[Black95TSIawd]

Originally posted by kpt4321
Ignition only (MSD) will build more boost then something like an EPROM stutterbox, because the ignition does not cut fuel (so the fuel still injects, and blows up in the manifold).




Yessir.

http://users.wpi.edu/~ktarry/files/adjstutter.mpg

Woot woot.

great vid kpt and to all. i just wanted to comment that ur server is awesome. i was dling at 650k/s.

 

[ITSME4G63]

Originally posted by ViVidTSi
You can use the E-brake and load it up in first gear {if it'll hold} and launch off that. It isnt that important as high revs and instant load {6000 rpm launch} usually works good enough {and breaks enough parts at that!

, my car can move with the ebrake, I mean shit I can launch with it!

 

[DSMKevan]

IS this ok for your engine?!?!

 

[kpt4321]

Originally posted by Black95TSIawd
great vid kpt and to all. i just wanted to comment that ur server is awesome. i was dling at 650k/s.

I do my best to go over the school's bandwidth limit!

 

[kpt4321]

Originally posted by DSMKevan
IS this ok for your engine?!?!

Yeah, it loves it!

Antilag is hell on turbos. Stutterbox isn't that bad, and nobody really does it enough to do real damage.

 

[DSMKevan]

Would you only use it when racing?

 

[awd4g63]

I use my eprom stutterbox and I love it.

Only real concern I have it setting it higher in the rpms (5500, 6000) and building boost with all that fuel cut. I'm not too intense on the subject, but I'm just curious as to how bad it really is.

I guess as kpt said, no one really does it enough to hurt anything.

On the eprom chip, you can powershift the car via a 3rd rpm limiter (set at 6500rpm). This cuts fuel also, but you're at full boost (20-21psi for me) and this just seems like it would be hell. Any input?

 

[805eclipse]

when i have my car in neutral and rev it i cant make any boost it goes up to 0 and falls back down.. it does make 10 lbs of boost while driving tho what would cause this?? my boost gauge only reads 10 inches of vacuum at idle so i know theres a vacuum leak would this cause it.. any help would be appreciated thanks.

 

[DSM_23]

you only make boost under load, so while in neutral the drivetrain isnt creating load so there's no boost

justin

 

[tsunari]

you only make boost under load, so while in neutral the drivetrain isnt creating load so there's no boost

justin

I'm going to have to disagree with that one . . . If my memory serves me correctly, I can make roughly 5-10 lbs of boost while in neutral. I'd go double check right now, but it's late and I doubt my neighbors would appreciate it But then again . . . I do have a T25 and they spool up pretty quick.

I'd go ahead and get your vacuum leaks fixed and see what you come up with good luck!

 

[Coldandafraid]

Ok... its hard to make boost in neutral. Get a stutterbox or something. Just free reving it, you wont make boost.

 

[DSM_23]

the only times ive ever heard of boost building in neutral was with a stutterbox, or with an automatic, due to the torque converter adding slight load to the engine.

justin

 

[tsunari]

the only times ive ever heard of boost building in neutral was with a stutterbox, or with an automatic, due to the torque converter adding slight load to the engine.

justin

You mean like building and holding boost? That I can understand, but if I just rev up and check my peak-hold . . . I've definitely built up boost (although it doesn't last long)

 

[DSM_23]

Yes i do mean by holding it. I could possibly understand getting slight boost spikes from revving pretty high as well.

 

[TargeT]

uhh, you build zero boost when free reving

you might get up to zero vacume.. but no boost

stock boost meter is RPM based,, not very accurate (same with most low end ones)

 

[DSM_23]

uhh, you build zero boost when free reving

you might get up to zero vacume.. but no boost

stock boost meter is RPM based,, not very accurate (same with most low end ones)

This is incorrect autos have been known by many to build a little boost in neutral caused by the load from the torque converter. Stutterboxes do this as well.