Prototype_xB

surge?

tcengel

Ok, I may not be seeing this right. From the picture you posted, it looks like the internal wastegate is on your downpipe, not your manifold. It's hard to tell from the picture though.

Rasta

I don’t know man I don’t have any gauges to measure that. I am going to put the dump to the atmosphere on Mon or Tues if all goes well I should put up some good numbers. I tell you what though, even though I am stilled bummed about the boost creep problem that damn turbo is crazy. The car has a little more lag but when this thing goes into boost around 4300rpms and then full boost about 5000 buy the time you reach 7000 your like whoa. It feels like two kicks in the ___. When I get this car running right I think I will probably put up around 340-350whp on pump at about 12-13psi or maybe more...we will see.

Rasta

The block is stock the custom turbo setup was done by www.psiracing.com one of my friends from high school. Lance from Toyomoto put in the AEM and tuned it. The only time I got to dyno it was when it had a boost leak so the boost would not climb as fast now that the leak is fixed I cant really punch it anymore. The problem is that around 4500rpms I was only boosting 8-9psi by the time I got to 7000 it was at 12-13psi. So I did not get the 12-13psi when the car is making its most power at 4500 do you understand? Like that I put down 300whp.

Rasta

This is my third one

Rasta

There is an external wategate on the top left of the picture, that is old pic so it is an Turbonetics Evolution WG...Now it has a 44mm TIAL

318_tC

12-13psi on stock block YIKES!!!
Id get a new manifold homie...

Rasta

Naw it will be alright it's all in the tuning with the AEM I can see when detonation is occuring so we just retart the timing a little. You have to play with it if you drop back too much timing then it does not make any sense so you have to see where the midway point is.

Rasta

Also it is all about the way you drive too, I dont drive like a mad man or rag on my car all the time but when it time to play I do it you know? Just drive the car like a normal car and then get on it when you want.

tcengel

Ok, I was looking at it backwards. It looks like your WG dumps into the exhaust about 4-5 inches after the turbo. This is right at a 90 degree bend and that "could" be your problem. First thing I would do is try to externally vent your WG. If it doesn't creep then you need to merge the dump into the downpipe farther downstream from the turbo. Sorry for your woes, I had the same problem with my MR-2. I eventually added a high flow cat which fixed the issue.

Rasta

Thanks for comments, if does work I am leaving it like that SCARE some poeple on the road!

tcengel

External dump is fun. I think you'll like it.

Seriously though, I think what's happening is the dump is so close to the turbo and it's speeding up the exhaust gas which may be speeding up the turbine. The boost pressure coming from your wastegate is moving a lot quicker than your exhaust. It's a strange thought, but may be the issue. A 44mm Tial should hold just fine though.

I would recommend you call a shop that does big turbo, big boost set-ups often and see what they think. Try Titan Motorsports.

Rasta

Thanks man I will give them a call.

Rasta

Well I dumped the WG to the atmosphere and still the same issues I have no idea what is going on. I could make a new custom manifold but I don’t know if that is going to fix the problem. I am completely stumped.

318_tC

Maybe you should call another shop, that deals with ____ like this. Im having my custom manifold made by T1 Race Development here shortly, and im going with a bigger turbo and 3 inch down pipe. Hopefully I dont have the same problem. Are you running a boost controller?