Spooling Problem - SRT Forums

PT Christoph · 10-04-2009, 01:34 AM

Hi,
ATP 3071r with14PSI Spring /DW750s/3“Exhaust/4“intake

If I am on PCM controlled boost with 14 PSI spring, the turbo spooling later than if the PCM-boostcontroll is off and only 14 Psi spring is on ?!?
BUT WHY??? Is it possible that the wastegate duty cycle start to early?

conroy9940 · 10-04-2009, 01:44 AM

why are you on pcm controlled boost with a big turbo? take it off.

lyncoo · 10-04-2009, 01:47 AM

you need a boost controller with a ball and spring and there is no reason you should not be boosting 20psi

PT Christoph · 10-04-2009, 02:05 AM

Would be a 20PSI spring also possible for dailydriving?

I do not understand why it spooling later?

lyncoo · 10-04-2009, 02:12 AM

Quote: Originally Posted by PT Christoph

Would be a 20PSI spring also possible for dailydriving?

I do not understand why it spooling later?

super rich at spool up and a mbc will help spool a little quicker too

lyncoo · 10-04-2009, 02:13 AM

just putting a heaver spring wouldnt help spool up. a mbc will do wonders. pm sent

lyncoo · 10-04-2009, 02:16 AM

ok sent you a pm with a good boost controller to get and leave the 14psi spring in your wga and add a mbc to turn your boost up

PT Christoph · 10-04-2009, 02:24 AM

ok thanks a lot.

But why start the turbo spooling earlier with the same wga spring? Only diffence was pcm controll on and off ???

lyncoo · 10-04-2009, 02:27 AM

pcm control kinda works like a boost controller

PT Christoph · 10-04-2009, 03:11 AM

Yes I think same, but it was so

only 14PSi spring = turbo starts earlier

14PSI spring + pcm controll = turbo starts later ?!?

lyncoo · 10-04-2009, 03:15 AM

oh, get that mbc and it will help.

nutz · 10-04-2009, 04:24 AM

sounds like you need a MBC or EBC (assuming there are no leaks in the exhaust mani) what happens with a spring only is the pressure on the underside of the WG valve with any pressure referance will allow the WG to open slightly slowing the spool (bleeding much needed exhaust energy), a MBC/EBC will eliminate that referance signal untill you want it there and that will eliminate the valve on your WG from leaking ....faster spool

you only want the WG to see signal when you want it to open not before

turbojonsrt4 · 10-04-2009, 08:21 AM

Quote: Originally Posted by lyncoo

super rich at spool up and a mbc will help spool a little quicker too

That's incorrect. A leaner afr will spool a turbo faster than a rich afr. Maybe you mean't his current setup is probably rich at spool up.

turbo666 · 10-04-2009, 09:52 AM

Super rich with little timing is referred to as anti-lag. Doing that without full PCM control or EMS isn't happening. The average person just does a leaner AFR to help spool.

**04blusrt_4** · 10-05-2009, 03:40 PM

Quote: Originally Posted by turbo666

Super rich with little timing is referred to as anti-lag. Doing that without full PCM control or EMS isn't happening. The average person just does a leaner AFR to help spool.

Enlighten me more

So if I set my timing low and have the meth nail early i can achieve this antilag?