More Boost After Tune

[shotter]

I got my car tuned and because the car started to missfire over 14psi it was tuned at 13psi. I have changed my sparkplugs and fixed up the coilpacks so i want to see if the missfire is still there under higher boost. Now what im wondering is would it be safe to run higher boost with the current tune? The engine has forgies and the turbo is a high flow that i have been told can handle 20psi easy. Could i just watch the knock sensor and if it starts to knock i how it's running to lean? I would like to be able to do this without having to fork out more money on a retune.

[H@ME]

it a risk i guess but as long as you watch the knock sensor it should ok for a addition of a couple of PSI i would guess.

would like to know the answer from others too..Hame!

[clip14]

if you had the fuel, turbo and strong enough engine, why didnt you run to the limit with your tune?

[TiTAN]

the knock level wont tell you if it is running lean, you will also be running at higher load points in the ECU which might not have been tuned.

[2LV8ETR]

the car started to missfire over 14psi it was tuned at 13psi.

I don't want to state the obvious, but are you running an aftermarket ECU? The stock ECU will cut the boost at 14psi.

[R31Nismoid]

How about now you've fixed the problem - you go back and have the tune finished?

That would be the smartest approach

[shotter]

I asked for the tune to be done on the highest psi. But it was tuned at 13psi because that was the "safest for the turbo and heat" but he told me he ran it up to 20psi and the ratio's were fine. After that i called him back and asked for the dyno runs and then he decided to tell me that anything over 13psi it had a missfire. The reason why im not running to get it retuned is he stuffed me around and a tune that should have cost $250 cost me over $2000. So im not going back to that workshop. And i went to another workshop and found that they were idiots too. These are both performance workshops. And the computer is std but i have a haltech intercepter connected that was tuned.

[femno]

$2000!!!!!!!!!

What area are you in? Others on here can recommend good workshops to go to.

For the safety of your engine you should just go and have it checked for higher boost by someone in the know.

Consider investing in a PowerFC.

[H@ME]

agreed, did not know u was only running a piggy back style ecu go for a pfc they cheap and will handle everything you need. but in general would it hurt to add a couple of psi? i'm only running 10psi off the gate no boost controller at all, i have a manual boost controller..can it hurt to add a few psi? i have an apexi turbo timer which shows hypothetical afr's and mine is always in 10-12 range (meaning lots of fuel yea?) so can it hurt to add some psi? Hame

p.s sorry for hijack!

[shotter]

Yea the $2000 is a very long story.... I live in canberra. And i would really like to get a powerFC but they sell so quickly.

But if anyone could recommend someone who can tune a haltech and is anywhere near Canberra please let me know. Or if anyone is selling a PowerFC for a R33 please let me know.

[H@ME]

look in the parts for sale section on here there is heaps of rb25det pfc's!

[shotter]

everytime i look there are heaps but they get sold within a few days.

[femno]

Yeah one went up for 850 2 nites ago and was SOLD the next morning...they go quick when theyre cheap.

Thats why you need to be on the forums 24-7

[H@ME]

agreed, did not know u was only running a piggy back style ecu go for a pfc they cheap and will handle everything you need. but in general would it hurt to add a couple of psi? i'm only running 10psi off the gate no boost controller at all, i have a manual boost controller..can it hurt to add a few psi? i have an apexi turbo timer which shows hypothetical afr's and mine is always in 10-12 range (meaning lots of fuel yea?) so can it hurt to add some psi? Hame

p.s sorry for hijack!

anyone?

[2LV8ETR]

everytime i look there are heaps but they get sold within a few days.

Keep an eye on eBay dude. Click on the number:

1

2

3

[shotter]

Well the missfire is still there. So it must be the ecu cut is coming in at 14psi. How do i get around this without getting an aftermarket ecu? I really wish the dropkick that tuned my car told me about this.

[2LV8ETR]

Well the missfire is still there. So it must be the ecu cut is coming in at 14psi. How do i get around this without getting an aftermarket ecu? I really wish the dropkick that tuned my car told me about this.

Get it chipped

[shotter]

i have figured out the interceptor can modify the signal so the ECU wont see that it is running over 14psi. So im hoping this will fix the problem and i can get the tune touched up.

[Weapon]

If its an R33 RB25 ecu i wouldn't bother trying to get it chipped

Spend the $800-$1000 and get an Apexi FC

was going to go NISTUNE with my 33 GTR OEM ecu but i decided to just get a replacement PFC

[shotter]

Can anyone tell me what wire runs from the MAP sensor to the ECU? colour or pin number.