low boost sps 64

[ShawnS]

Tdr members I need some help!! I have searched and searched every post but havent had any luck figuring out my problem. . My situation is I just installed II 90hp injectors and a sps 64 and I can't get my boost to go over 36psi everythings been running fine, it dosnt seem to be missing a beat but I would think this new turbo would be pushing a little more boost. . I just recently installed all new intercooler boots and a rail gauge, wit still no luck. . I cranked in the boost elbow probably about 2. 5-3 whole turns and that got me at about 39psi. . Am I missing something here?? Im running just the smarty on #7, rail pressure hasnt dropped below 24k at WOT... And even then I gotta keep the skinny pedal mashed to the floor in 6th gear just to see that 39psi. I have tried checking the exaust for leaks everything seems to be fine. . Im running out of ideas so I figured I'd turn to the experts for some advice. . Any thoughts would be appreciated... Thanks Shawn

 

[RDyson]

I've read that it depends on which Smarty software you have loaded as to how much it boost fools. You are probably de-fueling as the trucks computer see's higher boost. You might get a boost fooler and try that. Or if you have a pressure box, that will also boost fool.

I know my SPS-62 was set at 45# from II. Your 64 was probably set the same and you should be seeing the full 45# with the 90 hp sticks.



Randy

 

[ShawnS]

RDyson thanks for your reply, I have tried a couple different software programs with my smarty but I'm seeing the same results. When I talk to Brady he said they set it at 45# before they ship it out that's why I'm confused. . Brady also sent me a boost fooler but I havent installed it, I took the sensor out of the factory turbo and just zip tied it out of the way. I just figured the smarty was doin the boost fooling for me but Ill have to try plugging in the one from II and see if theres any change. . I have yet to see any codes but its only been a week. . Yea I think my next step is to purchase a pressure box. .



Another thought about two weeks before I made the step to upgrade my turbo I did notice that my factory one was only putting out 27psi and it used to hit 32psi with no problem. . Should have mentioned that earlier, you think these problems are related

 

[cerberusiam]

You need to remeber that turbo is flowing a lot more air than the stocker. The 36 psi is probbaly equivalent to 50 on a stocker. As long as it running and pulling well it is probably all good.



The aftermarket turbo and injector software boost fools on the Smarty. As long as that is loaded and you have no codes it is just a lack of fuel. You probably have a 13 or 14 cm^2 hot side housing so it will take more fuel to really get the boost up into the 40's.



Time to stack somthing like the TST or Quad Race on it and crank the settings up. Then your clutch will give up.

 

[AH64ID]

If your MAP sensor is seeing 44psi it will defuel, even with the Smarty boost fooling, which is why you need the physical boost fooler...

Fill out your sig so we can see what your truck is.

 

[ShawnS]

I have my truck profile filled out, i copied and pasted it into my signature (hope that works) I'm going to try and plugging in the boost fooler tomorrow morning and will post my results. Thanks for your help, Shawn

 

[ShawnS]

OkI tried updating my signature once again hopefully this time it works. . Plugged in the boost fooler took it for a ride around the block, still seeing 36psi and no codes... Im going to be taking it on the highway tonight on my way to work, ill really be able to get on it and see if theres any changes... Shawn

 

[JasonCzerak]

Make sure you are using hte "aftermarket turbo and injector" software with the smarty. other wise it will defuel at 28psi. The injectors are helping push past that to near 40. just a set of 90hp sticks is amazing as far as the jump in power.

I recently put my truck back to stock software for a test and was able to peg no more then 40 with a PS62. It did set over boost codes (silent codes, non performance degrading codes).

Plug in the boost fooler. And have some fun, load up #9. you'll be fine. !!! Oo.

 

[AH64ID]

There is an okay change that all is working as advertised... 36psi is now a much larger volume of air than it was before.

 

[JasonCzerak]

There is an okay change that all is working as advertised... 36psi is now a much larger volume of air than it was before.

with the smarty on 9 and 90 hp sticks. it should be able to hit 45 with easy, especially in a manual. . There is a big difference between 36 and 45. with stock head ports.

 

[Forrest Nearing]

There is an okay change that all is working as advertised... 36psi is now a much larger volume of air than it was before.

I think "mass" is the word you're looking for, not "volume"



with that said, the aftermarket turbo isn't going to make 36psi = 50psi... it'll certainly be more efficient, but not THAT much more efficient. especially at only 36psi

 

[AH64ID]

Well I still think volume would be correct... if you look at the map of the turbos I bet there is a larger volume of air at 36 psi with the new turbo than there is at 36 psi with the stock turbo... but potato. . pootaatoo.....

If the wastegate on the 64 is manual it wont matter if its aftermarket turbo software or not the electronic wastegate will not be able to open as its not there, thou you will get an overboost code... the defueling wont start until 44psi.

 

[Forrest Nearing]

technicly it's mass... the cylinder head ports will only allow so much CFM... you can move more oxygen at a given volume by increasing density. thus increasing mass



the two axis on your standard compressor map is pressure on the left and lbs/min of air on the bottom. lbs/min is a measurement of mass over time

 

[ShawnS]

Well I just got to work and before I left I downloading another aftermarket injector and turbo software and uploaded it to the smarty. with the new software on #9 and the boost fooler in, a hard pull in 5th gear I got the usuall 36psi and in 6th gear at about 3k rpms I might have seen 38psi right before I had to back off, rail pressure was just under 24k and egts didn't go over 1200 degrees. . So about 2 exits before mine I pulled off and adjusted the set screw on the boost elbow in about another half turn, got back on the highway and seen the exact same results. And still no codes wit the boost fooler in. .



Could it be possible that my wastegate could be stuck open or malfunctioning cause I have yet to hear it pop off??



Thanks for all your help, shawn

 

[Forrest Nearing]

yes, some of those S300 hybrids have had hung wastegates. you should pull that bottom plate off and inspect to see if the gates are hung. You'll probably have to remove the turbo to do this

 

[JKloppe]

There is an okay change that all is working as advertised... 36psi is now a much larger volume of air than it was before.

I am saying the same thing Forrest said in different words so you might understand.





36lbs of boost at a given rpm is always the same cfm doesnt matter what turbo (hy9 vs big SOB twins). If the rpm goes up the cfm has to go up to keep same boost. So if he is making the same amount of boost at a higher rpm he is flowing more cfm.



Think of boost as a measure of restriction, given rpm = given flow rate

 

[Forrest Nearing]

the point he's making is that with a more efficient compressor, you will have greater oxygen content (mass) at a boost pressure.

 

[JKloppe]

It would be interesting to see the difference in charge air temp with the two different turbos. (air density, mass)

Like you said probably not that much different at 36 lbs.

 

[ShawnS]

Ok I'm pretty sure I understand wat you guys are saying (this is all new to me that's why I probably sound a little confused ) Now do you think I'm over reacting or should I be satisfied with 36lbs of boost??

 

[JasonCzerak]

Ok I'm pretty sure I understand wat you guys are saying (this is all new to me that's why I probably sound a little confused ) Now do you think I'm over reacting or should I be satisfied with 36lbs of boost??

Injectors alone should get you near 40, injectors + programmer should be near 45-50. . I think you are a little low. check for boost leaks. see a thread of mine to make a smile tester