Bseriescivic5

Ok guys, setup is as follows:
b16a
CP Pistons, eagle rods, acl bearings, stock cams, 20g turbo, open exhaust, tuned on neptune. Car boosts fine until about 6K right when Vtec kicks in and boost drops off immediately, and car falls on its face. checked all charge pipes, and BOV all good (DSM crushed BOV, be lucky if the bitch even opens), Running a delta gate......could this be the problem? Help!


Modified by Bseriescivic5 at 11:51 AM 6/15/2007

non-VTEC

what kind of:

manifold
wastegate location
boost controller

are you using?

Bseriescivic5

Log manifold, no boost controler right off the spring.... wastegate comes off at a 90 to the manifold bout a 5 inch runner towards the pass. side of car.

Bseriescivic5

seems like we may have fixed the problem. Changed the cap and rotor and the car held 5psi with no problems. I still think we may have had or still have a boost leak, as the wastegate has a 7psi spring but the car wont make more than 5psi...? Possibly loosing the boost through the intercooler? not sure, going to re check all charge pipes and see if i can come up with anything.

Joseph Davis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bseriescivic5 &raquo;</TD></TR><TR><TD CLASS="quote">I still think we may have had or still have a boost leak, as the wastegate has a 7psi spring but the car wont make more than 5psi...? Possibly loosing the boost through the intercooler? not sure, going to re check all charge pipes and see if i can come up with anything.</TD></TR></TABLE>

Is the wastegate fed off the IM or the compressor scroll?

Bseriescivic5

compressor, Found out tonight that i still have the same issue again, after it was working fine last night....stumped guys

It doesnt seem like it is an ignition issue since i changed the cap and rotor, car has new plugs, and relatively new plug wires (NGKs). Only thing we changed today was to go back to the delta gate (Put on a tial to see if it was the wastegate, still had the same problem until we took some sandpaper to the rotor and she held 5psi to redline......) help

Chris Tune

use the reference from the im... and recheck.

Bseriescivic5

changed it, still has problem. stumped.

Bseriescivic5

changed back to tial wastegate, held the boost till about 7500ish (no tack) and then fell off completely. boost went to 5psi, then droped down to about 3-4 and then at about 7500 fell off completely.

Jared

what air filter?

Bseriescivic5

just a regular filter...? has a 90 rubber hose bend off the inlet and a beat up regular old filter. why does this matter?
P.S was driving with it yesterday open (no filter) and problem still persisted.

b16a4

leaking manifold?

.BoostCreep

Ideas only... I'm REALLY new to Honda, but not turbo motors, so dont throw if I recommend something that is off the wall.

1. What plug gap are you running? Do you think you may be simply blowing your spark out? I've done this on a Turbo ford I had, but it was running 18psi.

2. Try bypassing your IC to rule out a leak... or you could pull your IC out and pressure test it.

3. Can you disable the VTEC somehow and see if you can boost past that point?

4. What's the AF look like when it falls flat?

5. Are you sure youre not having a fuel problem?

Bseriescivic5

well the plug gap is spot on at .018 which is fine. after i changed the wastegate/new cap and rotor it will climb past vtec and fall on its face about 7500 well into vtec. A/f is spot on the entire way (car was tuned properly) Manifold could be leaking, but the turbo spools fine, i cant imagine the boost falling off like that and not falling off the whole way through.


Modified by Bseriescivic5 at 12:24 PM 6/15/2007

Bseriescivic5

car has precision 880's with walboro 255hp pump, dont think its a fuel issue, will go through these things tonight, see if anything changes.

esedulerp5tenin

i'm havin a similar problem, 7 pound spring in my tial, but only seeing 5 pounds
prolly due to my leaking manifold, but i'll let ya know what i find out

Bseriescivic5

yeah, good luck man, Im starting to think that my charge pipes are the issue, i checked them before and they looked good, but imma take them all off and look at each individually.

Bseriescivic5

turned the boost down last night, still running the tial and boost held to redline (5psi) so the delta gate was definatly not helping the problem, but there is for sure a small boost leak somewhere.......still stumped guys.

HiProfile

If you're able to hold low boost, and medium boost until there's lots of airflow in the pipes, it sounds like you have a partial leak somewhere. Maybe a coupler is slightly ripped, and only leaks where there's enough pressure (or flow) to push it open and leak. SInce the different WG's don't help, its unlikely to be a WG valvestem leak.

Bseriescivic5

heres the thing thou, the tial held the boost longer in the RPM range than the delta gate, which tells me that there might be more than one issue here at work. It seems likely that the chargepipes are failing somewhere.


Modified by Bseriescivic5 at 6:37 PM 6/21/2007

Bseriescivic5

ok guys, went through all the charge pipes again, one by one, they all looked good, even completely closed off the BOV, and changed the gaskett on the Tial waste gate. Still had same problem......

t3b18b

it doesnt seem to me like its a wastegate problem. because if it was spiking it would be much more erratic. it is more likely you have a pin hole leak in your intercooler. are you using t-bolt clamps? the standard hose clamps tend to dig into the silicone and start to tear them which could cause a leak. these things are often the most obvious of problems. good luck

Bseriescivic5

i am not using t-bolt clamps, just regular hose clamps. I went through all the charge piping last night and individually inspected every coupler, they all looked good. Im wondering now if one of the welds failed (i suck a welding) so my next step is to grind down all the welds on the charge piping and look for a leak there, and then weld back up if necessary.

Also changing the plug wires tonight. As i said before when took some sand paper to the old rotor, the car came to life and held boost till redline, so at least some of the problem was ignition related.

Bseriescivic5

changed the plug wires, difficult to say if it had any effect, car seems to hold 5psi pretty well, untill about 8k, still falling on its face at this point. Bad dizzy possibly?

CoreyR

build a boost leak tester, test the car for boost leaks and report back.