The setup is stock B18C1, Drag kit, Tial WG w/open dumptube, running open downpipe for the time being/

Problem: Craaaaaaaaaaaaaaaaaaaazy spiking! First started it up, took it for a spin, it sat around 6-8PS (5.5PSI spring). Then it got to 9, then 10, then 11+.

So I switched up the vacuum sources...ummm not cool. 20PSI+ when I got into the throttle. As soon as I saw the needle jump, I let off. Crazy!

So now I will be rolling into the throttle MUCH slower. Anyway...I pop on an MBC and set it almost all the way closed. Still spiking 11PSI+.

Any ideas on whats going on?

 

how did you hook up your vac lines with/without the controller?

 

Side port of the Tial to the FPR, where the boost guage is teed as well. Nothing is in the top port of the WG.

 

Of course it spikes with an open downpipe.
Your wastegate cant keep up.
Try hooking your exhaust up.

 

Chill dr gonzo, Im new to this turbo ****

So I can expect that spiking running open downpipe, even this severe? Exhaust is getting trimmed tomorrow to fit.

I removed the MBC, hooked up the WG direct to the FPR again and saw steady 8PSI at WOT. Then 10. Then 12. Then a steady 8-9PSI for a couple WOT runs. Im also shifting at ~7k-ish.

Would the hose have anything to do with it? I am running a hose a *bit* too small, so it isnt on the nipple on the WG all the way, maybe halfway down the nipple. Its not blowing off the WG, Im just curious if maybe the hose diameter has something to do with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by psi420 &raquo;</TD></TR><TR><TD CLASS="quote">Of course it spikes with an open downpipe.
Your wastegate cant keep up.
Try hooking your exhaust up.</TD></TR></TABLE>

I dont' think it would spike that bad with open DP, My friend was running a maxrev kit with open DP for a few days untill he got his exhaust installed and it held a steady .45 bar with the open dp and once again with the exhaust...

 

OK, ran it again.

Now I get solid 8-9PSI until high RPMs (7k+) where it shoots to 12-15ish (I dont know, I shift as soon as I see it jump).

Would the gasket in between the WG and manifold have anything to do with it? It is on, but it isnt a new gasket.

 

hasn't there been problems with the drag manifolds?

 

DRAG manifold with 3" exhaust = Boost spike issues.

DRAG manifold with open dp = MAD boost spike issues

Its due to the shitty location of the wastegate flange on the drag manifold. If it was centralized over the flange where the turbo is then you would be ok. This is very, very typical of DRAG 3 manifolds.

 

I agree with 93LSivic. Even with a 2.5 to 3.0 we saw 11lbs spike to 15lbs. They need to take some advice from people and redesign their manifold. Sell your Drag manifold and invest in an Inline Pro, LoveFab or Full Race manifold. There could be allot of things contributing to your boost spike but I will bet it's mainly the manifold.

-- 0x64

 

****, I just got done w/ my install about 3 weeks ago and I was boost spiking to about a bar, sure felt really really good. Turned out to be the way I hooked up my electronic boost controller. Now boost is very steady (Drag 3 kit). But damn 1 bar felt good. Time to
do some more work.

 

Excellent...I should be getting my TP shortened tomorrow, Ill slap it on and hopefully these spikes will be history! Glad to hear you guys specifically saying mad boost spikes with open downpipe are normal...thats just what I want to hear!

I understand the WG placement is retarded on Drag manis, but I was hoping for such low boost, it wouldnt be THAT a big deal (IE maybe spike to ~8). 20 is definitely more than I bargained for

 

my car is doing the same thing... today i got it on the road and it was spiking like crazy... went all the way to 14psi... and then smoke was everywhere... white/blue smoke... now my car wont start... i dont know what i blew

 

Dr Gonzo.....thats funny.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by psi420 &raquo;</TD></TR><TR><TD CLASS="quote">Dr Gonzo.....thats funny. </TD></TR></TABLE>

whose dr. gonzo?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by newgsrdriver &raquo;</TD></TR><TR><TD CLASS="quote">Excellent...I should be getting my TP shortened tomorrow, Ill slap it on and hopefully these spikes will be history! Glad to hear you guys specifically saying mad boost spikes with open downpipe are normal...thats just what I want to hear!

I understand the WG placement is retarded on Drag manis, but I was hoping for such low boost, it wouldnt be THAT a big deal (IE maybe spike to ~8). 20 is definitely more than I bargained for </TD></TR></TABLE>

No, they are saying boost spikes are common with that manifold. Mad boost spikes with that mani and open dp.

 

Thats what I meant...I understand the problems with the design of the Drag mani, I thought that was implied in my sentence. Oddly enough, Im glad to hear it!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jer Del Sol &raquo;</TD></TR><TR><TD CLASS="quote">my car is doing the same thing... today i got it on the road and it was spiking like crazy... went all the way to 14psi... and then smoke was everywhere... white/blue smoke... now my car wont start... i dont know what i blew</TD></TR></TABLE>

w0w

 

the drag manifold is fine for small boost, you shouldnt see much of anything go wrong w/ the basic drag 3 kit on say 7 psi. Depending on where the downpipe is "open" would make a difference in the spike, assuming its a normal drag 3 downpipe, it would be towards the end, and it shouldnt spike that much, I would run your wastegate vac source off the turbo (if it has a port) you will see lower boost.

 

I am using a drag 3 mani on a custom kit and a tial wategate @ 10psi, and it's rock solid. I've never seen it spike an ounce. It holds the boost within .02bar (.67-.69) and you can see it flucuate when watching the apexi (or passenger watching )

 

Just for everyones info...slapped the testpipe/exhaust on and the spiking disappeared!!!

I am peaking at around 8-9PSI, but at least I can take it above 6500RPM. Running way rich up top as it is, need to get it tuned. Ill slap an MBC on and see if I cant bring it down a bit.

So people installing drag kits reading this post...dont run open downpipe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by newgsrdriver &raquo;</TD></TR><TR><TD CLASS="quote">OK, ran it again.

Now I get solid 8-9PSI until high RPMs (7k+) where it shoots to 12-15ish (I dont know, I shift as soon as I see it jump).

Would the gasket in between the WG and manifold have anything to do with it? It is on, but it isnt a new gasket.</TD></TR></TABLE>

Holy crap... the same thing happens to me with my Drag Manifold but im at 10psi(with a .45bar spring) and I spike to 16psi at 7k+
I think all this started when I put on my 2.5-3.0in testpipe and thermal 3inch