Speed94

For some reason my tuner says he cant get the boost to go over 12 PSI. every time it gets right around there it drops. He says its something about the back pressure or something. Car made 320 which was less then when I had my previous cast mani on there. I know there are a lot of people make a lot more power with the same setup. Heres mine:

Precision SC34
Spoolin log mani
spoolin 3" downpipe
full 3" Apexi N1
LS/VTEC (GSR head)
ARP head studs
Edelbrock Intake Manifold
Precision 880's
Walboro fuel pump
Greddy Type RS BOV
Tial 38mm gate
Block guard
GM 3 bar map sensor
Hondata s300


Any help would be appreciated.

kyden

what are you running for boost control?

Speed94

I run a perrin EBCS unit thats hooked into the hondata.

0xenocron

Have you leak tested your charge piping?

Is he saying that the back pressure is too high for the turbo to overcome and not boost any higher than 12 psi?

Speed94

Whats up Chris....I believe thats what he is saying, but he also said to get a ramhorn and it will solve my problem. I know that a lot of people are running the spoolin log getting over 400 with the same mods as me though. Dont feel like dropping another grand just to be able to boost more. I didnt think an SC34 would have a problem making over 12...on my last mani it make 14. I switched manis because i wanted to get to arouns 18psi, but ended up spending more money to make less power

AWDstylez

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speed94 &raquo;</TD></TR><TR><TD CLASS="quote">Whats up Chris....I believe thats what he is saying, but he also said to get a ramhorn and it will solve my problem.</TD></TR></TABLE>

That doesn't even make sense. I'd say your boost issue is something else (boost leak or pre-turbo exhaust leak) and your other issue is the tuner. Get a new one.

However, is there any reason you went with a log on a B-series? Seems like a waste of a solid setup.

JDMs1eeper

unplug the wastegate vac so it doesnt seen boost. watch boost gauge to make sure you dont over boost but check to see if it "will" boost more then what he is saying.

My bet is, the manifold is fine and the tuner might be broken and need to be changed. lol

Check for exhaust or boost leaks. if boost is an issue still

93CX

Sounds like BS, I'm going to make well over 320 on my Spoolin log combo

patrick4588

iTrader: (1)

are you running a dumptube on the wastegate? without a dumptube it can cause excess exhaust in the engine bay essentially making it where no useable oxygen is pulled into the motor

Speed94

Yes...running a dumptube on the gate

Speed94

I wasnt looking for extreme hp...I was just looking to get to 400 or so and Ive read about people using a log and making that kind of power and more.

nowtype

You have a leak post compressor or your EBC is broken. What you are talking about is not a manifold issue.

Speed94

How do you check the ebc?

0xenocron

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speed94 &raquo;</TD></TR><TR><TD CLASS="quote">How do you check the ebc?</TD></TR></TABLE>

Try an manual one in its place to see if it fixes the issues

nowtype

Acquire a MBC from a friend/eBay/where ever and see if running a simple MBC fixes the problem. If it does, then the EBC is the issue.

AWDstylez

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speed94 &raquo;</TD></TR><TR><TD CLASS="quote">How do you check the ebc?</TD></TR></TABLE>

Someone told you already. Disconnect the boost source from the wastegate and CAREFULLY roll on in 3rd gear and see if you can get more boost. If it still doesn't boost enough, you have a leak issue.

B18C1CYA

what size spring is in your wastegate ??

patrick4588

iTrader: (1)

you can only run about twice the psi that your spring is. so if you only have like a 5 or 6 psi spring in it, then that could be why

0xenocron

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patrick4588 &raquo;</TD></TR><TR><TD CLASS="quote">you can only run about twice the psi that your spring is. so if you only have like a 5 or 6 psi spring in it, then that could be why</TD></TR></TABLE>

You can only run approx twice with a MANUAL boost controller...with a proper EBC you can run up to 4 times the spring, give or take.

JDMs1eeper

yeah, the max i could run with my 7psi spring was 27psi. Held steady for years.

patrick4588

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xenocron &raquo;</TD></TR><TR><TD CLASS="quote">

You can only run approx twice with a MANUAL boost controller...with a proper EBC you can run up to 4 times the spring, give or take.</TD></TR></TABLE>

oh. well i have a piston actuated wastegate, so i didnt know. just tryin to help


Modified by patrick4588 at 1:42 PM 1/16/2008

Speed94

I don't know what spring is in there to be honest. I know the tuner changed it once it got there though. I dont think he would oversee the spring as the reason why it wont go higher...plus it drops when it gets to 12...it wont hold there or go higher

patrick4588

iTrader: (1)

do a boost leak test. with the car off, hook up an air compressor to the compressor side of the turbo and put like 20psi through the system. if there are any leaks, all the excess air will blow out. its easy to hear and pinpoint that way