Can't get any more boost from stock turbo

[usetaboost]

Got the rod cranked all the way in. Jumps to 23 lbs in first and settles to almost 21. In second and third it spikes just over 22 and drops to slightly over 20. Is this it or is my wastegate just not heavy enough? I know that turbo is making a lot of heat though, checked intake temp and it was over 200 and the IC was damn warm! I have a power plate if that makes any difference.

 

[Boost231]

you can wire it shut and see what happens. or you could block it off with rjc's block off plate and see. 200 deg intake temps isnt bad. i wish i could get mine to be that low at the topend of the track. then again mine is a hotair car.

200deg intake temps on a intercooled car you need some alky.

 

[usetaboost]

It was already ran damn hard before then-numerous times before I even looked at it. I gotta stop posting threads so late at night. I don't make any sense "is my wastegate not heavy enough"? How about, "is my wastegate actuator not pulling hard enough?" BTW, everything is stock except for cam, air intake, and exhaust.

From what I've read on the board, high intake temps are expected after running hard with stock turbo/intercooler and higher boost levels. Mine is about 20*more than everyone else. I think I know what's causing that though.

 

[charlief1]

Sounds like you're trying to blow it up Jesse. You just got it running.

 

[aminga]

I'm curious as to the cause since I couldn't get my car to go above 18 PSI last year. After a pass with no knock I cranked the rod up first one and then 2 turns and no more boost.

 

[usetaboost]

Sounds like you're trying to blow it up Jesse. You just got it running.

If I was TRYING to blow it up I could have managed that a long time ago. Don't worry Charlie, everything is good compared to last fall. If I was gonna blow, it would have been then, when my blm's were pegged from the exhaust leak BEFORE the 02 With my junk alky setup, 02s are still over .800 through 2nd and 3rd, no knock, and blm's hold fairly well around 128. It's all good dog. My intake temp is a little higher than normal (+20*) after a few hard runs. From what I've read it's normal with stock turbo and unmodified IC. I'm also running stock DP and elbow so that can't be helping things either. Spray can only do so much with 20yr old technology I guess

I'm curious as to the cause since I couldn't get my car to go above 18 PSI last year. After a pass with no knock I cranked the rod up first one and then 2 turns and no more boost.

I'm guessing it's a combination of stock IC and stock actuator?? I talked to turbonuts and he said his does the same exact thing mine does. He's running a 44 turbo and THDP. SO we ruled 2 things out. I know with a boost controller you can get the boost past that. That's a whole other story... http://www.turbobuick.com/forums/tu...-luck-those-cheap-ebay-boost-controllers.html

 

[GNVYUS 1]

Well there are a few things that are happening, but to make it short, you need to free up as much backpressure as possible to help that small turbo sing. A 52mm turbo trying to fill up a 231ci engine at 5200rpm is a tough feat, getting as much of the compressor map back is SUPER important.

So, start freeing up inlet backpressure like ditching the stock MAF, Intercooler, and TB/Plenum. The stock intercooler alone is killing 5psi off the compressor map, add 3psi more for the stock MAF and you can see why everyone always shows low 20's psi in 3rd with the stock turbo and parts. Going mafless or Z06 maf and 3" inlet pipe will help right there 3 to 2.5psi.

Go E85, Alky and no intercooler and start seeing 30psi!!!!:biggrin:

 

[usetaboost]

I need to do a sig sometime My mods are hooker catback, hotwired pump, 9 inch k&n cone, maf pipe, lt1 maf and translator, 204/214 cam, 42lb injectors, and a crappy little homemade alky kit. At the end of my first hard pull, my manifold temp was at 200 at the top of 2nd. I just looked at the log earlier during lunch. I'm starting to think the IC is holding it back or the actuator just ain't man enough. The manifold temp started coming down as soon as I let out of it.

 

[aminga]

I


I'm guessing it's a combination of stock IC and stock actuator?? I talked to turbonuts and he said his does the same exact thing mine does. He's running a 44 turbo and THDP. SO we ruled 2 things out. I know with a boost controller you can get the boost past that. That's a whole other story... http://www.turbobuick.com/forums/tu...-luck-those-cheap-ebay-boost-controllers.html

Got that covered. I have an ISAC.

 

[usetaboost]

Well I got over 20 psi with a boost controller. Helps when the ball and spring are in the correct positions But now it jumps to 27 and then drops down to 23. I'm guessing this spike is because of the non ported wastegate hole?

 

[GNVYUS 1]

With the stock turbo the spike can also be from it not being able to fill up our engines under higher loads and rpms. This happens a lot in the Import world with cars turning 9k on tiny turbos. The spike can be lessened by the wastegate hole etc but the other side of the spike can be the tiny turbo not being up to snuff under load in higher rpms.

I'd consider a HUGE stock location IC to help with backpressure and MAT temps. There is a link to the Source from years ago that can help with what stock locations had the least amount of backpressure, that is key with the stock turbo holding boost in 3rd.

If you're seeing 200+ MAT temps at 23psi, you can see how crazy hot the comp wheel is before the intercooler. Even with your MAF etc you still might have 8psi of restriction to the stock turbos comp map to overcome which could be 90-100 degrees of extra heat.

 

[usetaboost]

From what I've gathered the stock intercooler is garbage no matter what way you cut it. Wish I had money for a cotton's front mount IC or another equivilant 1000 dollar IC

 

[charlief1]

I can check with my old boss and see if he still has the cooler from the Dodge PU we took off last year if you want Jesse.

 

[usetaboost]

I can check with my old boss and see if he still has the cooler from the Dodge PU we took off last year if you want Jesse.

thanks for the offer charles, but I'm trying to save money to get some body work done. (unless its stupid cheap) That way I can add some more pics to my thread:biggrin:

 

[charlief1]

Well considering he'll just sell it for scrap it's probibly cheap as h-ll.

 

[usetaboost]

let me know what it's off of and what he wants

 

[charlief1]

It's out of a Dodge diesel Jesse. I didn't get a chance to call him today so I'll try tomorow.

 

[usetaboost]

It's out of a Dodge diesel Jesse. I didn't get a chance to call him today so I'll try tomorow.

ok. Let me know the specifics so I can get an idea of how much of a pita its gonna be to put it in.

 

[charlief1]

Will do Jesse. Do a search on the board for info on using a Dodge intercooler. I've read a few that have been posted and it's interesting as well as a huge cooling effect.

 

[usetaboost]

research is already done as far as the intercooler. Yeah dude just let me know the year it came off of and how much shipped to sioux city, ia 51109