HELP... MY RB25DET IS NOT MAKING ANY POWER

[RB MERC]

hey i need some help...

i have an rb25det with the following mods

Microtech ltx12 720cc injectorsgt35 turbotop mount manifoldfront facing plemumand a few other like blow off vaulve ect..

i have had it tuned and dyno... it only got 100KW!!!

i was shoked... help me want wrong.. i am fresh out of idea on where the power is going?

[Shocker]

obviously your tuner doesn't know what hes doing, or your having serious issues with other things your just not telling us.

[RB MERC]

he know excatly what hes doin! he has years of experence.

and why would i hide anything.. i want to find the problem! im asking for help!

[Darius]

If your tuner did not realize that 100kW is wayyyy low, then he's an idiot that has been doing a $hitty job of tuning for "years".

That engine should be putting down in the neighborhood of 400-500hp depending on boost. You need to tell us more about your settings in order for us to help you. Like boost, timing, air:fuel ratios, a dyno plot would be helpful too.

[Shocker]

he know excatly what hes doin! he has years of experence.

and why would i hide anything.. i want to find the problem! im asking for help!

Man I have like the SAME setup, just a lt12s, and I made 320 rwhp at 5200rpms at 14 psi this was only after about 1.5 hrs of tuning from my guy.... serious issues to follow for me but it wasn't the tuners fault.

So obviously something is wrong for you.

[RB MERC]

he does know its a bad reading!

but we have both tested and tryed almost everything we can think of to fix... with no results!

The air fuel ratios and fuel mixes are perfect!i have checked the cam timing.. they are good.compression i every cylinder is perfectthe timing is set to 10degree the computer retards it to 15

we wound down the boost to 10 to try to get a good reading... but still.. no results

please to wright me off as an idiot.. i am genunlly asking for help.. i am lost on this one!

[RB MERC]

i know something is wrong... thats why i started this tread.. BUT WHAT!!!! ???? everyone keeps tellin me there something wrong... i already know this.. i wanna know how to fix it!!

what problem have you got comin up dude?

[Shocker]

how does it pull on the road?

[rb25drag]

Thats weird if your A/F readings are good and its not making any power. Are you sure his Dyno isn't messed up? What type is it?

[240z4u]

He isn't using a tailpipe wideband with you using a cat is he?

I had some idiot tuner tell me I was VERY lean, and it was because my cat was burning off the excess fuel.

Evan

[Darius]

The base timing should be set to 15 degrees with a timing light, not 10. And why is the computer retarding timing?

Are you monitoring knock while tuning? I'm not familiar with the microtech, but for some reason I thought that it doesn't have knock reading capability without an add-on??

[Shocker]

The base timing should be set to 15 degrees with a timing light, not 10. And why is the computer retarding timing?

Are you monitoring knock while tuning? I'm not familiar with the microtech, but for some reason I thought that it doesn't have knock reading capability without an add-on??

Your right Darius, it has no knock feature, the computer WILL NOT PULL TIMING on its own unless its at its set rev-limit with a hard cut, therefore your maps are setup up wrong. The Microtech unit will do w/e the tuner tells it, so if tuner wants to advance 20-30 degrees in a spot, the unit will, it does what its told, even if that means self destruction.

[gawdzilla]

its probably your timing and it sounds like you're not typing up what he's telling you correctly or he doesn't know what he's doing. a/f can be right but if timing is off it will lose a LOT of power.

just by saying "the timing is set to 10degree the computer retards it to 15" makes no sense at all. are you talking about base timing? base timing for the rb25 is 15 btdc. if you're setting it at 10 btdc that is wrong. if your computer is retarding it to 15 btdc that makes no sense. 15 btdc is 5 degrees more advanced than 10, not retard.

[Darius]

gawdzilla is right. Even at redline, your timing is going to be more advanced than at idle. My baseline PFC map shows 23 BTDC at redline and upwards of 35-40 BDTC in the middle of the map.

If it is running 10 degrees across the map, the power should be 100kW.

Again, something is not adding up between what your tuner is telling you and what you are telling us. Either way, I wouldn't be paying him if he can't figure out why it is only putting down 100kW. I've been street-tuning my car for one summer and I know enough to get ~275-300hp out of it.

[RB MERC]

ok.... so the base timing should not be 10Degrees.... but 15???

once the timing check is turned off on the microtech the computer ADVANCES (sorry) the timing to 20 Degrees... does that sound right the microtech deealer would have set the timing advanceing up... not my tuner! i would imgin it would still advance more as the rev come up!

i will ring microtech dealer and ask what the timing should be?

[Shocker]

Heres the deal with the Microtech unit, when you order it you tell them the model engine its for, then setup a base tune for it then ship the unit to you.

Now the RB25 is supposed to be set a 15psi, thats what it should be on your Microtech unit display (either with the laptop or hand controller). That 15 degrees is what the unit EXPECTS the motor to be based timed off. So when you use your gun to time the engine's base timing, it should be 15 degrees so the Microtech and the engine are in sync.

Once you have done that, its now time to tune, using the different features in the Microtech unit you are able to start advancing the timing at certain RPM's which your tuner should know how to do.

On the main screen if your timing says it should be 20 degrees they might have sent you the wrong unit for your application.

[RB MERC]

got hold of the microtech dealer today.. the timing is set as it shoudl be!!!

any other idea??

what does the errors RMP and HOM on the microtech mean?

[Oki_R33]

What IC are you running?

Lets go back to the basics: have you checked all the IC pipping and the coil packs?

I got a feeling that this is something so basic it might be being overlooked!

[RB MERC]

i am running a front mount... 400x280 about (had one made do it could fit)2.5inch intercooler piping.

the coils are working mint... did have a problem with the to start with so replaced them all!

[Oki_R33]

Have you gone over all the pipping? one coupler out of place or a hole worn in a pipe could be causing some of your issues!!

Put up a pic or vid of your setup might help to see whats going on.

[RB MERC]

i havent checked over the piping a heck of alot... its gett 16PSI in the manifold... so i dont think there is any leaks!

[Shocker]

i havent checked over the piping a heck of alot... its gett 16PSI in the manifold... so i dont think there is any leaks!

you never answered my question.

How does it pull on the street under load?

[silviasgp06]

i havent checked over the piping a heck of alot... its gett 16PSI in the manifold... so i dont think there is any leaks!

making 16 psi in the manifold doesnt mean anything, if you have your boost set to 16 psi and theres a leak the turbo will still build boost to 16psi. like if you have a 10psi leak your waste gate will stay open to what would normally be 26psi if that 10psi leak wasnt there.

also how does if feel driving, does it feel fast?

[RB MERC]

nah... it doesnt pull like it should

[Shocker]

check your compression...

[RB MERC]

compresion is perfect through every cylinder

[Shocker]

compresion is perfect through every cylinder

how do you know? did you check it? and what are the numbers?

[rb25drag]

If the timing is perfect, No boost leaks, MAF is workin correct, Compression is good, Spark plugs are gapped right, Ign coils are all firing HOT, Fuel pump is pushing enough fuel through all RPM's then my guess is your **** out of luck!!! I think your over looking something. I think you need to get another tuner to look at your car and get a second opinion. It doesn't add up!

We need a video or something.

[RB MERC]

does anyone know how i can test that the VVT is working properly???

im pretty sure that the microtech is set up right... but im wonding if i need to run a relay.... i know you dont have to in all cases.. but i want to try emlimate this possibliity!

[Shocker]

does anyone know how i can test that the VVT is working properly???

im pretty sure that the microtech is set up right... but im wonding if i need to run a relay.... i know you dont have to in all cases.. but i want to try emlimate this possibliity!

VTC has nothing to do with your problem.

Your Mircotech unit should have a relay for the ECU itself. That still wont cause your issue unless your voltage is too low going to your igniter causing weak spark thats getting blown out. But your A/F's should show this.