aleks77

hey guys i have an f22 sohc accord, around 360whp. The car is tuned to 15 psi, but for some reason when you set it to 15psi it does not hold, it creeps to 17-18. I have boost cut in S300 set to 16psi, so far the best i have been able to get, is to set 3rd gear to 10.2 psi, and 4th to 10 psi. And this way it builds boost and holds at 15psi. 2nd gear is set to 12 psi and it holds around 13.

Is this ok? im curious what is wrong with my setup, because i want to go to 18psi after its dyno tuned. I have OBX ramhorn manifold (i know its crap but others have made 23+ psi on it), 38mm Tial WG with 7.25psi spring. Will changing the spring to 10psi help my boost creep...?

Thanks a lot

RedneckRicer

i imagine you have check and inspected for vaccumm and boost leaks?

aleks77

well ive only checked the vacuum lines if they are on or not. Im not 100% sure how to check for boost leaks, could a lose clamp on one of the chargepipes cause this? I thought if i had a boost leak it would be hard to reach my psi, rather than overboost...?

RedneckRicer

i use a fog machine best way IMO to detect boost or vaccumm leaks. some people use soapy water in a squirt bottle.

HamiltonRex

what are you using for a boost controller? the s300?

aleks77

s300 boost controller

spoolin turbo s

your gonna need a bigger wastegate or another wastegate i would imagine that the wastegate placement on the obx mani isn't ideal

HiProfile

The problem is probably wastegate size. It actually takes a smaller wastegate to make more boost - more boost requires less exhaust bypassing though the WG.

Very little will help, besides changing the WG size (and the tube its on) or wastegate placement/angle. You need to bypass more exhaust around the turbo, and there's only one way to do that - through the WG.

turbociv910

if you have a 7 psi spring, you can only hold around 1 bar efiecnelty before it starts acting up. you need to get a 10psi spring and go from there. And it might be becuase of that crappy manifold not allowing gasses to excape

aleks77

thanks for the replies guys. There is an almost identical setup to mine with obx mani, and the guy ran 20+ psi no problem.

My 4th gear is set at 10 psi, and at 10 psi i can hear the wastegate dumptube (straight dump) open up, so its working properly...

the other problem im having is consistency, i had 3rd gear at 10 psi and it was making 15 psi and holding it, now i went out last night and couldnt get any more than 12 psi, and today i cant stop it from creeping and overboosting. I havent changed anything, yet on different days its doing different things....i dont get it, one day its holding boost at 15, the other day its holding at 12, and now its overboosting 17+

aleks77

i have also noticed that having a 2nd person in the car causes the car to overboost easier than with just me.....anyone got any ideas besides wastegate sizing? I had a little bit smaller turbo before and it held 15psi just fine, same setup.

black_EM1

I had roughly the same problem on my last setup. I was running a PeakBoost Ramhorn with a Tial 38mm (7psi spring). It would spike from 17psi (my daily) to 18.5psi on occasion. This turns out was due to the S300. I was using gear based boost as well, but the S300 software does not have a gain feature. Read up on that if you'd like. It's still awesome software.

However, the problewm may be your WG placement. Just some ideas.

got wide

so are you saying that if i have a setup that runs 10 psi, and i now want to run 30psi, i would have to get a SMALLER wg??? why wouldnt you just use a boost controller to keep the wg closed longer? wouldnt that let less exhaust through the wg and also prevent overboosting with a high boost setup and a tiny wg?

please give me some evidence to correct me if im wrong.

aleks77

this is pretty weird problem, it seems to be kinda random, here is what happened last night.

Boost set at 12psi in 3rd gear, was overboosting to 17psi all day yesterday
Set it to 11 psi last night, it holds 11.
Set it to 12 psi, holds 12
Set it to 13 psi, overboosts but holds 15
Try 14, overboost to 17+
Set it back to 13, still over boost to 17+

What the hell is goin on, im gonna try a 10psi spring this weekend, see if it makes a difference. Any more input is really appreciated

aleks77

today i changed to a 10 psi spring, and the problem is still there, nothing changed, it still creeps. When i went for a drive today here is what happened;

Set it at 13, holds 15 for 3 runs than creeps
Set it at 12 still creeps
Set it at 11 holds 15 for 4 runs than only holds 13
Set it at 12 creeps
Set it at 11.5 holds 15

its like weird, tommorow ill go out with it still set at 11.5 and i bet you it will hold 11.5 not 15 like it did when i shut off the car and went home...can this be a software problem, or boost controller problem? My previous turbo, which was almost identical, held 14 psi when set at 14 psi no problem, never creeped.

extralargenog

iTrader: (1)

S300 Boost controll sux ****....


COuple Good friends ihad issues as well... they tried defending the S300 authoritatively to me (I cant blame them after paying that much for that thing).... but tried everything to get it to work right, went to an AVCR and have had NO issues at all..

ROCK solid..

The S300s boost control fails

Fitting, it being hondata and all... I have a Built H22 making 630whp running on crome with an AVCR, not 1 issue at all, with just 1 44mm tial.

That being said that manifold is not helping (nor is the small wastegate), however the spring will keep you from making boost, not bring too much. You should have NO problem making 18 PSI on a 7.25 spring with a GOOD controller... and manifold....

ANother buddy had alot of trouble with his OBX manifold creeping.... He spent more time ****ing with modifying where the WG comes off the manifold than the pile of **** was worth, but in the end (his wg tube that attached to the collector protruded INTO the colector) it held solid

DItch the manifold, get a 44 and run a ten pound spring... THEN if you have trouble get a AVCR


DId I mention s300 boost control sux?

aleks77

Wouldn't it be cheaper for me to get an AVCR than a new manifold/44/re-tune? Like i mentioned before LoDollar on cb7tuner made 430whp at 25psi with a 12psi spring, with no boost creep issues. Exactly same manifold and 38mm tial, almost identical motor setup (F22a sohc)

I think im gonna borrow a boost controller from someone and see if that helps.

extralargenog

iTrader: (1)

Ya i know that clown... LOL... And my foirst thought is that it is the shitty Homodata boost control.


AVCR is the ****!!!!!

black_EM1

Again, I stated why the Hondata boost control has issues. No gain feature. The software in itself is great. It's just missing one small thing, well it's pretty major, actually. I still stand behind it. But....

For problem-free boost control AVC-R is probably the way to go. Alot of higher horsepower K-Series guys are using the K-Pro for tuning and the AVC-R for boost control.

As jacked as your problem is, I don't think it's the Hondata though. I only spiked 1-1 1/2psi at the most.

If you can, go with the AVC-R. If the problem persists, no clue.