a big turbo on low boost needs a big wastegate. I think the grand national guys were have creep problems with the 67s with 38mm gates. Once they swapped to 44mm, it was just fine.

This is all based on if you turn off the boost control it will still spike past 7psi

 

ok, so i checked my lines, everything looked good. Checked wiring, everything good. I even pulled off my cold side to see if i had oil in my intake and the intake is clear.

While i was under there i put a 6" piece of hose and my filter back on the oil res. Vas, it's easy to use hose and then just zip tie the hose to your oil return line. Worked perfectly.

Now, i turned off boost controller....umm, ya, so the wastegate works. I'm still alittle shaky after that dump opening up. It's pointed out under the drivers door and i had my windows open. There is no doubt in my mind (and the minds of everyone within a 1 mile radius) that the dumps opened on wastegate spring. i don't know what psi but i know out of the corner of my eye it didn't get to the 10psi bar on my gauge. I'll check the logs when i get done teaching my radiology lab for tonight.

After boosting and then stopping at the university i let it idle for a bit and got some smoke. Nothing major but it was visible smoke from the exhaust. not concerned but still wondering wtf. It didn't smoke the entire other time i was driving it.

 

Im going to try the hose then. sounds easy!.

Jeff, I have noticed that too.. when I drove the car the other day after countless WOT pulls.. I pulled over and let the car idle.. when I got out.. I saw a bit of smoke coming out..( not like a puff of smoke ) IT definitely doesnt smell like oil though.. ( I know what burn oil smells like ) I literally stuck my head by the exhaust and all I could smell was the emissions... Could it be that we could see a bit more smoke than lets say our old vortech setup? the DP being very short as well as the exhaust?.

Btw, when you first start the car or let it sit for a while.. when you take it out.. do you see smoke coming out?? I still cant figure it out why i get smoke when i first start it up.. but then it goes away..

 

I honestly don't get any smoke, at any time. I had my wife do a couple of hard pulls from 2nd 3rd on the highway with me behind and there is a bit between shifts. That however is normal even on a N/A car.

I know it stinks when I turn the car on first thing in the morning because there is no catalytics, but no smoke.


Just wondering, how is your a/f ratio when the car is cold? May be a bit on the rich side, and that may contribute to some extra fumes/smoking.

 

Sasha you got Pm

 

so far mine doesn't smoke wehn i first get it out. Mine has been ok today except i did some hard pulls then when i got to the univeristy i let it idle for a few minutes and it smoked a little.

 

As far as the boost control issue goes, triple check and make sure that the hoses are connected to the proper ports on the solenoid. If you have one crossed, it could be putting boost pressure on the wrong side of the gate, preventing it from opening.

 

mine is setup exactly like that picture. My solenoid only goes to the top port on my wastegate. The bottom port is referenced from the turbo.

 

so if its boosting past the spring pressure with no boost control, you probably need a bigger wastegate


But realistically, once tuned you'll never run less than 15 lbs so I guess it doesnt matter. I wouldnt even worry about it at this point.

 

took it for a drive. It's a 1bar spring. It held just under 15 psi all the way through. Bx must be mislabled.

also, open dumps are stupid loud. I'm literally deaf in my left ear.

and this pulls way harder than my 451hp on the DD. I even have timing way back

 

that why veterans go with recirc dumps. open dumps are only cool for a limited amount of time

surprised BP was so sure it was a 7psi spring. whens your tune?

 

+1 when is your tune? i cant wait to see some decent results!!!

 

I tried to respond last night and my phone deleted my post.

the box says .5 bar from tial so that's why sasha thinks it's .5. Tial said I would have to add a large .5 spring with it if I wanted .5 bar. The spring is ordered and at injected already but I guess I won't need it.

injected has been busy so it will be a couple weeks now. I also need to fix the oil drain thing since it's leaking a little. I'm also going to heat wrap some exhaust pieces cuz it's hard to work under the car after running it without burning myself. Headers are wrapped so it'll match.

I have some quick data from haltech logs.

3813: *7.3 ( .5 bar)
4000: *10.6
4500: *13.1
4700: *14.0
4785: *14.6 (1 bar)
4862: *15.0 (boost creep or slight gauge variation)



After 3 long pulls the max ait was 135. *It took 2.5 seconds on my log for the ait to return to 110 degrees after the peak. 18 seconds after peaking at 135 the temps were back to 102 degrees. *Ambient temp outside was 91 degrees.

That was at the end of 3 15psi pulls back to back.

 

Jeff, I can tune your car if you want lol.

anyway.. your making good boost.. once the BC is working you should spool a bit faster. I hear wrapping your exhausts pipes can spool you faster.. but I didnt notice a difference.

 

I thnk I'll pass on the tune vas, thanks for the offer though!

I haven't seen proven research on spool times to heatwrap. I'm only doing it for safety of my arms and also keeping temps off of my charge pipes since they are a little close to the drivers up pipe. I don't expect any performance gains.

 

The turbo is close enogh to the headers, so the heat loss is insignificant. I think the STS guys see some imporvement, but the turbo is another 7' down the line.

 

this is good news, full boost under 4800rpms. with a boost controller you might be able to knock it maybe a couple of hundred rpms. looking foward to the full tune and numbers. this is a similar setup than what im going to have minus the haltec.

 

Jeff has the .68 a/r T4, you got the .81 a/r. Your set up will take a bit longer to spool.

 

^ouch, my twin 6262s fully spool at 5000 and it the laggiest setup ever.

 

I think the T4 .68a/r will be a good overall set up once tuned. Timing will improve spool as well, so once Hal works his magic on Jeffs car I think it will look very good.