Boost control
- Thread starter Sy#26
- Start date
If I'm set on kill at 26 psi, it usually hits 26 psi in 1st gear (or close) stays there until the converter locks and then I get a slight bump in boost to about 27 psi.
It seems the more spring pressure on actuator the better. Basically if I set my spring pressure to 15 psi and then bleed it to make 26, boost control is terrible, but if I set the boost at 26 by running a direct line from the turbo to actuator it's very good.
It seems the more spring pressure on actuator the better. Basically if I set my spring pressure to 15 psi and then bleed it to make 26, boost control is terrible, but if I set the boost at 26 by running a direct line from the turbo to actuator it's very good.
ghettosled
SYTY SUPERSTORE
I agree. The last PTE kit we did came set at 10psi base. Trying to control 20psi though a cheap bleeder was so so. Electronic may have been a better choice, but this was a budget thing. Tightened up the spring to the point it now makes 20psi base boost. rock solid. TE60.
Everyone is going to have different results, and with all the different setups and configurations out there its hard to say what to expect. If you are with stock wastegate and freeflowing exhaust you could have uncontrolable boost. External wastegate you should be rock solid. My suspisions are that you are detonating/going lean in 3rd and 4th thus pulling out timing which will lower the boost. With the TC locked you will usually see a spike in boost.
Everyone is going to have different results, and with all the different setups and configurations out there its hard to say what to expect. If you are with stock wastegate and freeflowing exhaust you could have uncontrolable boost. External wastegate you should be rock solid. My suspisions are that you are detonating/going lean in 3rd and 4th thus pulling out timing which will lower the boost. With the TC locked you will usually see a spike in boost.
I'm determined to see just what the integral WG setup is capable of. Got a hybrid, TE60 compressor on a Mitsu 14cm turbine, 1.44" flapper, port matched & inlet to flapper ported. 3" all the way exhaust, no cat, side exit pipe (short). Tried several WG actuators, currently using one made from a Deltagate diaphragm w/ arm welded to stock flapper arm to use its reversed motion. 13# base spring, 9psi on the 'backside' to give a 22 psi target, no ECM control used (as yet). AFRs are pretty steady throughout 3rd, no deto anywhere. Experience has shown that solenoid control of the Deltagate in the conventional fashion just doesn't react fast enough to prevent spikes @ shifts. Next to try is solenoid w/ D/C reversed as a supplement to the pressure provided to the 'backside' of the diaphragm by the regulator. Dunno if this'll work any better, but trying all this stuff is sort of fun. Formerly used an HKS in the crossover, control was pretty good, but just too durn much plumbing. Pressure variation of slightly more than 3psi w/ a straight, non-ECM hookup.
Will_in_China
Truckless Wonder
InvisiBill
Active member
Considered doing something like Christian Dionne's setup? He grafted a "tumor" onto his downpipe, similar to how the PTEs look in the pics I've seen. He drilled out the service port on the back of the exhaust housing, so the wastegate had a clear shot into the modified downpipe. From the sounds of it, that cured all the stock problems.
I've thought about going this route, but an external with stock control seems easier to me...
I've thought about going this route, but an external with stock control seems easier to me...
JSM
Active member
I have done the same mod, and SHOULD have ty running in next week or two (if moon and sun line up correctly). I will post my results, although they may be a bit scewwed with the other mods I have done.
I do like the idea though. And looking at turbo, the WG path now is 100X better than it WAS!.
I do like the idea though. And looking at turbo, the WG path now is 100X better than it WAS!.
rockvillespeed
Member
since it's come up again - who wants my money to build me this downpipe ?? (jeff!)
i've got heads and worked manifolds etc sitting on my shop floor.
anyone?
bueller?
i've got heads and worked manifolds etc sitting on my shop floor.
anyone?
bueller?
InvisiBill
Active member
Sy#26 said:
I was talking to TookyCat about it on ICQ a while back. When I described it, he was very interested, but I couldn't find anything on it. He said he found an old webpage with the info or something, but I don't think he gave me the link.
Look at the pic in http://syty.net/phpBB2/viewtopic.php?t=23218 of Jeff's. I noticed that when he posted that thread, but I thought it was a PTE or something... Pop that little circle out, and the WG has a straight shot out. Then you just have to have a bigger/modified downpipe to be able to catch the WG's exhaust. This un-restricts the WG flow, which has an effect similar to removing the cat (and other backpressure) on a stock exhaust, only opposite. The WG is now flowing more and can control the turbo better, as opposed to the turbo flowing better and the crappy wastegate doing an even crappier job.