So I posted a thread a little while ago about my turbo and it throwing a p0234 code. Got no respose. So, I decided I would try and dig a little deeper into the issue. I thought about making a leak tester to see if I can figure out what was going.So I went to the local stores and parted together a tester. Got a 4" rubber coupling and a 4" adapter with a cap. Put an air regulator on the end and called it good.So I put the tester on the inlet of the turbo and put the pressure to it. If I apply more than 10psi, the tester wants to slide off the turbo from the pressure. The rubber will also balloon out. I was getting a little nervous about a catastrophic failure but I managed to get it up to 23psi I think the wife said.I'm not sure if its normal or not, but I think my boost elbow is an edge boost elbow for one, but then also I dunno if the little hole on the side of it is normal or not? I may of not had the engine turned at the right point to keep the pressure up either but I was loosing pressure.My intent with the tester was to actually see if I could get the wastegate to actuate to see if the wastegate was indeed stuck. I dunno at what psi its supposed to open?So instead, I stuck the air hose up to the wastegate line with an air nozzle and applied air that way. It made the arm move and the wastegate actuated...So, I'm wondering now, if I have the boost elbow on is if thats whats causing me to throw the code? I took the truck out after and floored it. The highest the boost got was 27psi. With my injectors and boost elbow, should'nt I be making moe boost then that? Is 27psi also enough to throw the p0234 code as well?

If you dont have a boost fooler or a box that does boost fooling you will throw the code. Your boost sounds about right for the mods in your sig and the waste gate is set to open about 23psi.

Thats comforting to hear. I was really concerned my turbo was taking a poop on me. I have not bothered with a fooler, because if IIRC, the edge has one built into it? I'm hoping to get my hands on a newer version of one.

I missed the edge, they do have boost foolers built. What edge do you have? My comp is 7 years old and works great still.

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Your sig says Tow/haul valve body, who makes it and what makes it tow/haul? My buddy just came from an 04 d-max/allison to an 04 cummins/48re and misses the tow/haul feature his allison had. it actually downshifted each gear when coming to a stop to aid in stopping when it was in tow/haul. His 04 dodge has tow/haul but really just turns off the OD.

I missed the edge, they do have boost foolers built. What edge do you have? My comp is 7 years old and works great still.

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Your sig says Tow/haul valve body, who makes it and what makes it tow/haul? My buddy just came from an 04 d-max/allison to an 04 cummins/48re and misses the tow/haul feature his allison had. it actually downshifted each gear when coming to a stop to aid in stopping when it was in tow/haul. His 04 dodge has tow/haul but really just turns off the OD.

I had an edge comp and then got rid of it when I got the transmission rebuilt. What a mistake that was! When I got my transmission rebuilt, the owner said he would put a tow/haul vb in it. Essentially it makes the shift revs higher before shifting. Does not aid any in the downshift and the tow/haul is still an OD lockout function.

Wastegate should be fully open by about 20 PSI. So your P0234 is going to be a wastegate issue not a MAP sensor. Stock turbo without a boost fooler shouldn't make much more than 18-19 PSI typically after about 23 PSI the P0234 code is thrown.

Wastegate should be fully open by about 20 PSI. So your P0234 is going to be a wastegate issue not a MAP sensor. Stock turbo without a boost fooler shouldn't make much more than 18-19 PSI typically after about 23 PSI the P0234 code is thrown.

IIRC rule of thumb is for every 1psi of boost it is 10hp. So if the truck is stock, that means 230hp. Or about 23psi. So if I added my 75hp injectors that should bring me 35psi. I hit 27psi on the boost gauge on avg. So, it ought to be a normal thing for me to throw the code then. Now then, with this in mind. If I use that rule of thumb, why 'am I not making 35psi of boost? Turbo too small? And if I go that high on boost, could'nt I risk damaging something?

To get that boost you need...* Boost fooler like a module or programmer* Boost elbow (HX35W Turbo) or J Hook (HY35W Turbo)Then the boost will rise above 20 PSI and go up. There is no problem with running 32 PSI for a HY35W turbo and 35 PSI for a HX35W turbo. No harm will come. But if you decide to upgrade and go up from there then you will be considering head studs and and other mods.

To get that boost you need... * Boost fooler like a module or programmer * Boost elbow (HX35W Turbo) or J Hook (HY35W Turbo) Then the boost will rise above 20 PSI and go up. There is no problem with running 32 PSI for a HY35W turbo and 35 PSI for a HX35W turbo. No harm will come. But if you decide to upgrade and go up from there then you will be considering head studs and and other mods.

This^^^^^^^ Also at that psi, your just pumping a lot of hot air and your DP is huge. Not very efficient.

To get that boost you need... * Boost fooler like a module or programmer * Boost elbow (HX35W Turbo) or J Hook (HY35W Turbo) Then the boost will rise above 20 PSI and go up. There is no problem with running 32 PSI for a HY35W turbo and 35 PSI for a HX35W turbo. No harm will come. But if you decide to upgrade and go up from there then you will be considering head studs and and other mods.

I believe I have the older edge boost elbow? Its got a restriction on the port with two small holes in it. Looking at a programmer soon as well. Yea, I'm trying to avoid studs and gasket, etc..

This^^^^^^^ Also at that psi, your just pumping a lot of hot air and your DP is huge. Not very efficient.

DP?

DP=Drive PressureDo a search under Drive Pressure and member AH64ID. He explains is really good.

AH64ID has both a boost pressure gauge and a drive pressure gauge as well. So he's watching both sides of the turbo for performance. He's the man to talk to about turbos.