maxx880

Guys,

I'm stumped at this point with the issues I'm having...the setup keeps creeping boost to 22+ psi above 7k rpm and is on a 15psi wastegate spring, the boost solenoid is bypassed and not hooked up...there are no boost leaks what so ever, I have tested it to 35+psi on a boost leak tester...

Setup is...
84mm sleeved GSR(9:1 compression)
Skunk2 tuner1 cams
victor x manifold with s90 TB
dual 340lph pumps (10AN line from pumps to rail)
BWR top mount manifold w/ BWR v-band downpipe
46mm Precision Wastegate
Precision 6265 turbo
1200cc injectors (car is on e85)

Any ideas on what might be causing this issue?

ls joker

shitty teardrop.

post pic of wastegate collector

maxx880

for some reason I can not get an image to upload from my phone, it must be to large...here is a picture of the manifold from BWR website

Turbo-LS

iTrader: (4)

It's the turbo and could also be the tune on the e85. Not enough timing will creep the boost pressure. You'll need twin gates or a single 60mm and that will most likely fix your problem

th3pwn3r

To my knowledge that is a sh1tty design in the manifold that will contribute to boost creep/overboosting.

a1320honda

We have pretty identical setups. I had to eventually put a Precision 66mm gate on mine to keep it from creeping. When it had a Tial 44mm gate on it, i could pull the gate completely off and by 9000rpm it had crept to about 11lbs with no gate on it. I dug around and found that plenty of people were having to run a big single or dual 38's on a billet 62mm turbo.

It was a brand new Tial gate and tried a Precision 46mm gate to rule it out.

This is how i had it setup and it was creeping the least amount.


Like i said...the ONLY way i could get rid of creep 100% was a big Precision 66mm gate.

FlewByU352

Cheap chinese **** turbos and knock off wastegates

maxx880

ok thanks...Im going to try and use a buddies 5858 with .63ar before swapping out to a bigger wastegate

crvtectim

I'd try a stiffer spring before swapping turbos, unless 15 psi is the max you want to run. Dual gates wouldn't hurt that manifold though as I can see exhaust flow blowing right by that gate's entry even if it's wide open, like a1320honda experienced with a gaping hole in his mani where a gate should've been. It was the same for me with no gate, I still managed to build about 7 psi. I'm on dual 44mm gates now and happy to report I have no creep. 4 psi springs and a t4 60-1. It's difficult to control larger turbos at low boost. Good luck!

TheShodan

iTrader: (14)

It's more than the turbo. Those turbines are efficient, but its more the manifold than anything in this and most "creep" issue cases. I've seen many a xx62 and xx66 controlled just fine

maxx880

im actually looking to run 25-28psi but it is not keeping at a certain boost level...just slowly keeps increasing...do you think adding a 5psi spring in the WG to make it a total spring rate of 20psi would help? thanks for the input

crvtectim

I think it's worth a shot for sure if you already have the spring. And as turbo-ls stated, depending on where your timing is now, advancing it some may also kill some creep.

maxx880

I believe the tuner has it dialed in at 16 degrees...I'll double check though. I'll give the springs a shot tmw evening and post the results. Thanks!!

th3pwn3r

Yep...reading some of the posts here just makes me think that a lot of people need to do a lot of reading. This is coming from someone who knows little to nothing. Oh well.

maxx880

stiffer spring made it worse.

crvtectim

That sucks. If you can, remove the wastegate completely and go make a pull to see how much boost it makes. Beware of anything in the bay close to the mani opening that could be damaged/melted by the heat. I was able to remove mine and v-band a scrap piece of dumptube with a turn down to route heat away from stuff.

Turbo-LS

iTrader: (4)

it is going to creep no matter what you do unless you put a 60mm gate, reconfigure the whole manifold and give the smaller gate priority or put dual gates

crvtectim

Maybe there's hope for him, but his tuner will need to make that call. I tried different spring rates first, both low and high-ish, all of which still had the boost creeping. Then threw timing at it advancing up to 4 degrees, which was curing a bit of the creep, but we didn't like what we saw reading the plugs after those pulls. :/ But I'm on pump, whereas the op runs E85. He and his tuner might be able to get away with advancing the timing enough to cure the creep and still have a safe tune. For me, the easiest solution was to yank the mani and modify it to accept an additional gate.

mar778c

iTrader: (1)

Advancing timing is the worst thing to do for a purely mechanical configuration problem. One tank of so-so gas and you lose a lot of expensive parts. As others have said, reconfigure the gate.

V-SPEC 1

I had same issue with my customer's dc Teg AFI top mount t3/t67 HO Ball bearing setup. Put 4 lbs spring in the tial 44 gate and was creeping past 15 lbs. took the gate off completely and made a pull on the dyno without it and still making boost over 11 lbs. I installed another 44 gate on the manifold and it completely took care of the problem. Now, zero boost creep and now I'm able to set the boost by gear.

TheShodan

iTrader: (14)

And it wasn't a "6X66" Precision with its super unique turbine wheel, either.

Muckman

iTrader: (2)

These really short collectors simply can't bypass exhaust from the far 2 runners with only a single wastegate. You'd have better control by running an internal gate lol.

Turbo-LS

iTrader: (4)

I don't understand why the manifold companies don't lengthen the runners going down off the head and in return lengthen the collector and that would fix the issue. There is plenty of room for the manifolds to be longer