I need more boost please help

[1stgencummins]

I have a 92 cummins with a 727 3 speed with overdrive. I have pods in it. cold air intake. fuel screw cranked in. ground fuel pin. timing advanced. smoke screw turned in. I have a stock turbo on it and I am only getting about 25 psi of boost I think I should at least be running 28 or 29 how do I get more boost any one know. your help will be greatly appreciated thanks

[Begle1]

Get the soapy water and check for boost leaks.

[SChandler]

Is the transmission slipping at all? If the transmission isn't loading the motor, the boost will be lower than expected. Also, it is probably time for a new torque converter, regardless of the condition of the transmission. The factory converters are good for factory power levels only.

[Richie O]

I have a 92 cummins with a 727 3 speed with overdrive. I have pods in it. cold air intake. fuel screw cranked in. ground fuel pin. timing advanced. smoke screw turned in. I have a stock turbo on it and I am only getting about 25 psi of boost I think I should at least be running 28 or 29 how do I get more boost any one know. your help will be greatly appreciated thanks

Just so ya know, your tranny is a 518 not a 727. 727's were the 3 speed non overdrives.

[1stgencummins]

My tranny is not slipping. my truck has only 90,000 miles on it. I plan on yanking the tranny and doing all that stuff to it i just have not had any time to do it. which I am only 16 and I try to get all of my specs right but some times i goof up. I will try that soapy what thing and check for leaks

[peobryant]

My tranny is not slipping. my truck has only 90,000 miles on it. I plan on yanking the tranny and doing all that stuff to it i just have not had any time to do it. which I am only 16 and I try to get all of my specs right but some times i goof up. I will try that soapy what thing and check for leaks

Well you have a non lock up tranny, so technically it is slipping all the time.

Dodge blessed us with very, very sloppy converters from factory, so a low mileage truck, still won't be able to get the power to the ground, through the stock tranny.

I'd throw a Goerend converter at it before anything else.

[1stgencummins]

ok. well I was planning on beefing my tranny up to withstand 450 hp. becasue in the future I plan on doing more junk to it and I just want it to hold up.

[peobryant]

Are you still runnnig the stock lift pump? POD's and pump tweaks could probably pull your fuel pressure down to 0psi.

[Tacoclaw]

I've got a 90 non ic with a 727 3.07s and when I changed the converter my boost went from 25psi to maxing out a 35psi guage. It's a completely night and day difference. Only have a piston lift pump, some screws turned on the IP, and slightly advanced timing.

[peobryant]

Another note, the baby H1C's map range is only about 25psi anyways. After that, you are just pushing a lot of hot air.

[1stgencummins]

Yes I am still running the stock lift pump. I bought a hx35 last week and I am just waiting for the guy to bring it down next week. should that help me?

[peobryant]

The HX35 is just a hair bigger than your intercooled H1C, so you probably won't notice any difference.

If you put the 12cm housing on, you will notice a big increase in spoolup, and maybe gain a few psi of boost.

[RumbleFish]

i thought the autos didnt like the 12cm housing?

[peobryant]

i thought the autos didnt like the 12cm housing?

I don't know why that would be the case.

If manual tranny would like it, why wouldn't an auto? Unless the only reason manual guys run them is to be able to get there boost back almost instantly after every shift. I don't see how they would make more heat on an auto truck, than on a 5spd.

I know Mad Max ran a PDR HX35 with a 12cm housing and absolutley loved it. It was on his tow rig, and maybe his trail rig too.

[Richie O]

With an auto your rpms stay up high due to the converter stall. The 12 is a restriction at higher rpm's so it becomes a heat maker on a auto. Also with an auto you only need to light the turbo once.