Can somone help?? tuning!

[dsmlover211]

Okay so I was wondering if someone with a similar set up could maybe share there tune with me or something until I get mine done on dyno days. I am running an hx40, 780cc injectors, 255 fuel pump, forged internals, 6 bolt block, just the stuff like that, if you need to know anything please ask, I would really appreciate it if someone would help me out, point me in the right direction, it would be a huge help!

 

[jeepman1998]

How many blades on the hx40? How many lbs of boost? What head gasket and head bolts? desired hp? There is alot that can be made out of a hx40 I plan on maxing mine out crazy. More info would help. What do you have to tune with.

 

[dsmlover211]

How many blades on the hx40? How many lbs of boost? What head gasket and head bolts? desired hp? There is alot that can be made out of a hx40 I plan on maxing mine out crazy. More info would help. What do you have to tune with.

its the 7 blade, dsmlink says im pushing about 20psi, I have v2 dsm link.. I am getting v3 ordered on Monday. I have arp head studs, im not sure on the gasket. I want to make around 4-500 hp. I am honestly stumped tuning this, I have been used to my v8s which is a cake walk, but I love this turbo car more than any other car ive driven its just to much fun even with no tune. anything else?? thanks for your reply by the way!

 

[jeepman1998]

Start out by doing the high pressure bypass mod on the fuel pump. You will need alot of fuel because stock fp is 37 and if you run 20 psi, that is 57 psi at full boost. you pump will have not alot of volume because the high pressure bypass is opening. I am running 2 walbro intakes modded with 2 walbo inline with twin 8an line with 1600cc injectors on my hx40 pro. Use the stock 1g timing. Set the stock boost gauge as knock sensor and do a few 3rd gear pulls. Take timing out at rpm that knocks. Pretty simple.

 

[dsmlover211]

Start out by doing the high pressure bypass mod on the fuel pump. You will need alot of fuel because stock fp is 37 and if you run 20 psi, that is 57 psi at full boost. you pump will have not alot of volume because the high pressure bypass is opening. I am running 2 walbro intakes modded with 2 walbo inline with twin 8an line with 1600cc injectors on my hx40 pro. Use the stock 1g timing. Set the stock boost gauge as knock sensor and do a few 3rd gear pulls. Take timing out at rpm that knocks. Pretty simple.

okay I am confused as to what your taking about with the fuel pump, I have mine wired straight into the battery, I also have a afpr. ill do some research, how much boost do you think I should push to make around 400hp?

 

[jeepman1998]

I would run around 25lbs of boost, but go up a little at a time. More boost does not equal more hp if it is hot air. On the fuel pump there is a little freeze plug you can knock down. Look it up on google. If you run a felpro mls gasket you can run more boost easy. Arp headstuds are only good till around 38 lbs before they start to stretch. I run l19 studs now.

 

[WES_393]

Most fuel pumps have a high pressure bypass valve that will bleed off excess pressure at a certain point. Safety stuff.

But with a standard (non-HP) Walbro 255, that point is around 70-75psi. Stock base pressure for a 2g is 43.5psi, so I wouldn't worry about the bypass valve until your running near 30psi of boost.

And the stock headgasket with standard ARP head studs can easily handle your goals. It's all in the tune.

 

[dsmlover211]

I would run around 25lbs of boost, but go up a little at a time. More boost does not equal more hp if it is hot air. On the fuel pump there is a little freeze plug you can knock down. Look it up on google. If you run a felpro mls gasket you can run more boost easy. Arp headstuds are only good till around 38 lbs before they start to stretch. I run l19 studs now.

okay will do, and the ait sits around 90 degrees. I don't know if that's good or bad but I would like to run meth injection as well. that plug is even on the 255 pump?

 

[jeepman1998]

Im just saying that I have installed alot of walbro pumps before. They relief valve is almost never at the same height. I think since he is doing the mods to get good hp, that he should take the 10 min just to be safe. So just in case the boost does go higher than expected making adjustments there is the fuel to keep car in safe zone.

 

[dsmlover211]

Most fuel pumps have a high pressure bypass valve that will bleed off excess pressure at a certain point. Safety stuff.

But with a standard (non-HP) Walbro 255, that point is around 70-75psi. Stock base pressure for a 2g is 43.5psi, so I wouldn't worry about the bypass valve until your running near 30psi of boost.

And the stock headgasket with standard ARP head studs can easily handle your goals. It's all in the tune.

thanks, so i am pretty sure that under boost my a/f ratio stays around 10:1, also another off topic question.. i have a boost guage that when i hit boost, dsm link says im at 20.4 or so, this thing will go up to 15 no matter what i adjust the mbc to. i reads vaccum and all that, could it be hooked up in a bad spot??

Im just saying that I have installed alot of walbro pumps before. They relief valve is almost never at the same height. I think since he is doing the mods to get good hp, that he should take the 10 min just to be safe. So just in case the boost does go higher than expected making adjustments there is the fuel to keep car in safe zone.

yeah i might as well just take it out. ill google it and get it on out of there, in dsmlink what should i run my fuel settings at? i have a few logs but none with the wideband hooked up, ill post it anyways maybe you can see something that would help?

 

[jeepman1998]

Hook your boost gauge up to the manifold. It will give you the reading that your car is using. I would also suggest that you boost leak the crap out of the car. It will keep egt lower and be more efficient.

 

[WES_393]

I think since he is doing the mods to get good hp, that he should take the 10 min just to be safe. So just in case the boost does go higher than expected making adjustments there is the fuel to keep car in safe zone.

Yeah, it's definitely something to consider. Just didn't want the OP to think the pump is defective by design, or something like that.

thanks, so i am pretty sure that under boost my a/f ratio stays around 10:1, also another off topic question.. i have a boost guage that when i hit boost, dsm link says im at 20.4 or so, this thing will go up to 15 no matter what i adjust the mbc to. i reads vaccum and all that, could it be hooked up in a bad spot??

10:1 is a little rich, but still a good safe number. The biggest threat to your headgasket is knock/detonation.

As for the Boost Estimate in DSMLink, it's just an estimate. It's also only accurate at certain RPM points (5000-5500rpm comes to mind). But if you can't get higher than 15psi then I would check the gauge, boost controller, and wastegate actuator.

Injector settings:
http://www.ecmtuning.com/wiki/baseinjectordata

 

[dsmlover211]

Hook your boost gauge up to the manifold. It will give you the reading that your car is using. I would also suggest that you boost leak the crap out of the car. It will keep egt lower and be more efficient.

okay I will do some BLT tomarrow and hopefully I can get a base tune.

okay I will do some BLT tomarrow and hopefully I can get a base tune.

here is a log from today.