i have a horrible boost creep problem with my drag 4 manifold for the h22
heres a rundown of what i already did to try and cure the obvious possibilities

removed AVCR solenoid completely and tried numerous vaccum routes and new lines etc......

removed spring from Tial wastegate completely and still produced 4.3 psi at 6500 rpms

now spring back in i can get the boost to creep up to 10.5 psi on a 4.35 psi spring at 7200 rpms this was the highest number i seen it was from a 2nd gear 4000 rpm roll to about 7200 rpms

i also read a detailed thread about retarded timing and how it will obviously produce higher EGT's and the theory is that the hotter exhaust gasses have more energy and can keep spooling the turbo even though 2 cylinders are being vented into the atmosphere, makes perfect sense

the only reason i think it may be my egts is because i have my hondata tuned for the fuel up to 6500 and my timing maps were untouched, but the base map we used were from a h22 with stock compression and i am running appox. 9.6:1 as opposed to 10:1 so i would think that i would need the timing advanced some which would cool the EGTs down some. My EGTs as of now run from about 600C at about 3 psi and climb relative with the boost where they have reached 900C at 10.5 psi and the hotter the exhaust gets the more it creeps

so i know there has to be a few guys at least that have this manifold and i want to know if they have been having boost creep issues so i can make a final judgement and decision on what to do


ok in middle of writing this DRAG returned my phone call and i will tell you guys what they said when i get the whole scoop

is there anything i can do to lower the EGTs to test my theory i have cam gears, and no romeditor software, and the obd2 prelude cannot retard/advance the ignition timing via the distributor

please keep in mind this is not a B-series and the wastgate placement is someone better on the H-series from my understanding


Modified by ziggity at 9:02 PM 5/9/2003

 

Just curious as to what DRAG said about your situation?

 

ok talked to drag for aboutan hour on the phone as they reccomended everything i already did except i think the whole EGT theory was a but too much for them

what it basically boiled down to is they told me my exhaust was too free flowing and i needed to install my CAT i have a 2.5 catless DP and 60mm Mugen Catback which IMO is one of the worst for free flowing exhausts out there

im wont blame DRAG just yet becasue i wanna try the EGT thing but they are trying to be very helpful i actually talked to the owner

 

there was a tread like 2 days ago about how the drag mani had problems with creeping. so goin by that previous thread i would say its the mani that needs changing.

 

all those threads i have read refer to the B-series manifold which this is not also there has been others that ran this mani with no problem i just wanted to get a concensus on what everyone thinks of the situation

 

you using a boost controller? a good EBC usually solves the problem.

 

i disconnected the boost controller to run new vaccum lines and run some trial and error tests to see if i could narro down the problem i will try tomorrow

 

i can vouch for B series creeping.

 

If its the same manifold that was posted before, the wastegate is on the #1 runner
correct? In which case it will not be able to control boost properly if you have
any sort of free flowing exh(ie 2.5"or larger)

 

ok there are some pics of the exact manifold that is giving me boost creep and that others are running with no problems

 

and just to clear things up i dont have a free flowing exhaust i have a 2.5 inch DP no cat and a 2.37" Mugen catback (huge resonator and twin loop muffler)

 

haven't seen one of those in a while, creep may be due to the horrible wastegate placement.

 

Joey, are you seeing any commonality in the answers you are getting here?

 

well i am seeing that not many people in this forum have had experience with this specific manifold just the b-series

but in the prelude forum, PO.com, and h22a.org there are many people that are successfully running this manifold with no boost creep even sagaprelude from this board ran this manifold with a deltagate with no boost creep