01 lb7 dmax..... cant pass 480 rwhp on the dyno.

[Scarface]

I built a dsp5 tunes for a customer his truck has stock injectors stock turbo fass150. he has dynod 480 rwhp at h&s dyno. I am trying to get the truck to hit 500+ hp. I do have the tune avaible if sum one wanna take a look at it it is on 35's crew cab long bed. his best pass at the track is 13.2

[Mitco39]

hows the rail pressure? if its holding just turn up the fuel a little, should be enough for a 20hp boost. Also what boost are you seeing? stock wastegates suck.

[Scarface]

it holds max rail pressure still. but has stock fuel pressure table in it. max boost we are seeing on the insight monitor is 23psi of boost. he does have the mbrp down pipe intake heater deleted on it. I have about 3050us on injectors with 28degrees of timing. just stumped with it. he has a stage 5 ppe trans in it. we did the ii injector cups and arp headstuds in and the trans.

[Mitco39]

The insight is not good at monitoring boost unless your have the expandable sensors installed. I would suggest a real boost gauge (or get the extender for the insight) Or if you have a way of monitoring boost directly on the dyno that would also be preferred.

Hows the smoke under load? if its dirty all the way through then you need more air to make more power. Running out the injectors much past where you are now wont gain you anything but heat, especially if your dirty up top as it is.

[Scarface]

from a stop to about mid range its smokey and clears up but still a lil haze at the end of the track egts are 1600.

[Scarface]

when dynod last it was 100% load on the dyno and it blacked out the dyno room lol over at h&s

[Mitco39]

Id take a closer look at your boost. Sounds like you have plenty of fuel and I wouldn't go to much higher on the WOT timing unless its your truck and your aware of what could happen.

[Scarface]

the truck belongs to a good friend of mine and he is aware of it. this truck is out in Utah. we are trying to hit the 500 hp mark. would u say the boost table will need to have the boost coming on sooner in it?

[Mitco39]

LB7s don't have boost control tables. Its all mechanical. If the stock wastegate isnt holding its own thats holding you back.

[Scarface]

ok thanks buddy. so need to check to make sure the wqastgate is doing its job or being lazy and opening up when it shouldn't. would taking the b0748 table on the lower rpm and about mid fueling up to 100% fueling to about 2600 rpm and set it to 0 help spooling the stock charger more as well.

[WisconsinHick1]

Well being in high altitude doesn't help much either for boost pressure. Also look into a PPE boost valve or build a manual boost valve to help keep the wastegate closed longer.

[Scarface]

I couldn't rember if he is running a boost valve in his truck or not. his track times are decent due to being lifted 6 inches off the ground and 35 inch tires at a 13.3 to 13.5 times in the 1/4. I know he are going ot upgrade the turbo once the money is in hand. I had another customer I built the trans in his lb7 he has tunes from another local tunner and made 534 rwhp but his track times were equal to my customers/buddy truck

[THEFERMANATOR]

If it is a stock turbo with no boost valve, you NEED a boost valve or adjusteable wastegate to get any more out of it. I only run a 2250 pulse at 170 rail pressure, and had to put a boost valve in to clear it up. It didn't smoke bad, but more than I liked. Got it up to about 28 now peak, and the smoke is virtually gone now.

[Scarface]

it has the boost valve in it, but I have the fuel pressure table still in stock form for that the tune.

[THEFERMANATOR]

How much boost are getting out of it? You need anactual boost pressure gauge on it as the factory sensor tops out around 22 or 23 at sea level(will read higher at altitude).

[Scarface]

he is running the edge insight monitor on his truck I am getting him to hook up a mechincal boost gauge on it.

[THEFERMANATOR]

If you delete the intake air heater, that is the best place to read boost. Don't go over 32 PSI on the stock IHI turbo though unless you want it to go boom.

[Scarface]

ok buddy thanks we will give it a check to see were it is at.

[djv86]

32psi as a gauge reading or 32psi under the boost table as total intake pressure ?

[Scarface]

as in boost gauge reading not boost table.

[djv86]

Alrighty. So 32psi is max boost for the stock lb7 turbo. I'm guessing they are gated at less boost then that though

[THEFERMANATOR]

Stock boost for 01 is 20-22, and 02-04 trucks are normally around 18-20 stock. Remember the boost pressure tables refernce absolute boost pressure which is atmospheric + boost. So at sea level you have 14.7 PSI of pressure, add in 22 pounds of boost, and you have 36.7 absolute which is what the ECM will reference. Anything over 32 psi of actual boost pressure will send the turbo into an overspeed situation, and can cause the impeller to explode. Some have gone higher, but others have had them come apart at 30, but 32 is normally the accepted max for most units(I limited mine to 28 to be safe).

[djv86]

Stock boost for 01 is 20-22, and 02-04 trucks are normally around 18-20 stock. Remember the boost pressure tables refernce absolute boost pressure which is atmospheric + boost. So at sea level you have 14.7 PSI of pressure, add in 22 pounds of boost, and you have 36.7 absolute which is what the ECM will reference. Anything over 32 psi of actual boost pressure will send the turbo into an overspeed situation, and can cause the impeller to explode. Some have gone higher, but others have had them come apart at 30, but 32 is normally the accepted max for most units(I limited mine to 28 to be safe).

The tune im dealing with is set for 37psi max. And I'm in pismo beach California which is sea level. Is that over spinning the turbo?

[Scarface]

is the boost table set to 37psi if it is set at 37 psi in the table the max actual boost it is making is 22.5 psi

[Mitco39]

You can ignore all the boost tables in the LB7. They do nothing to control boost, only monitor it so that a CEL can be thrown if the truck senses an issue with the operation of the mechanical boosting system.

[djv86]

You can ignore all the boost tables in the LB7. They do nothing to control boost, only monitor it so that a CEL can be thrown if the truck senses an issue with the operation of the mechanical boosting system.

Makes sense. Thanks

[LB72004]

If you delete the intake air heater, that is the best place to read boost. Don't go over 32 PSI on the stock IHI turbo though unless you want it to go boom.

would that be PSIA or PSIG? i assume PSIG. if the stock boost sensor was able to read high enough then it would be something like 46~47 PSIA? is this correct?