Boost Problem Hitting Some Sort Of Limiter On 15psi

[GTR-27L]

Ive got a R32 GTR and ive taken out the ristrictor in the hose that goes to the boost controller solaniod but i was also told to join those 2 hoses together to get 15psi.. It works BUT like at 6000rpm its sometimes starts to make a limiter noise. could some one help me because my car is GOIN NUTS ON 15PSI

I was only running about 8-9psi before but now that little bit extra is awesome.

DO GTRS have a boost cut defender?

ANYONE?

Im only new to the forum so this is a pic of my car.

[Stevie]

if they are anything like GTST's then yes they do.

[GTR-27L]

see it only seems to happen in second gear it sounds like its spluttering then it stops and keeps hammering 3rd gear doesnt do it. but im all was racing in 2nd gear:)

[TTT]

explain exactly what happens at this 6000rpm mark.

does it cut the power completely.. like is it violent?

is it like a rev limiter where it stutters and kinda back fires?

doest it keep reving up but kinda misses?

what happens to the boost gauge when this "CUT" happens? still sit at 15 or drop?

with more description and those answered, people can give you a better response as to what the problem is.

at the moment it could be..

AFM max

spark blowing out due to excess boost.

coil packs arc'ing out

etc...

[GTR-27L]

Ok well when is hits its not violent it holds back for a bit then it keeps on pulling its makes like 3 soft limiter hit sounds but its only happening in 2nd gear.

what do you think?

[TTT]

I think that the fact that you now have about 2 x the boost you had before, you are blowing out the spark.

there are a few things you can try which will cost you nothing but some of your time.

1.) take out your spark plugs and gap them down to 0.8mm.

if they already are, drop them back to 0.7mm.

2.) with some electrical tape, tape up the coil packs. there is a guide on this in the maintenance section of these forums.

I did the above 2 points 2 weeks ago and my car revs out smoothly now.

mine is an rb20 but same edal.

runs a little more boost than stock.

I suggest you try the 2 things above as they are free and MAY fix the issue.

If you are in Sydney, I can help you do it if you like.

[Stevie]

yeah could be losing spark if its not boost cut

[GTR-27L]

Ill probly give it a go but if i run into any trouble ill let you know.

where about r u located im near parramatta

[TTT]

If you want help, I can be available saturday afternoon around Ashfield.

[GTR-27L]

i appreciate the offer and let you know how it goes today:)

Mick

[Sydneykid]

if they are anything like GTST's then yes they do.

Write it out 20 times..........

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

Half way there……………

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

THERE IS NO SUCH THING AS BOOST CUT

Hope you learnt a lesson, next time it will be detention for you

cheers

[Stevie]

uh huh

so your saying that the factory ecu doesnt have excess airflow protection which when detected will dump the timing and run rich to protect itself?

[TTT]

Gary you cut and pasted.. or did you use the 5 chalk holder thingy that music teachers use?

[paulr33]

BOOST CUT DOES NOT EQUAL EXCESS AIRFLOW CUT

BOOST IS NOT AIRFLOW, BOOST IS PRESSURE

TOO MUCH AIRFLOW TRIGGERS THE PROTECTION

is what he is trying to say

[GTR-27L]

Ok SydneyKid if there is no boost cut what do you think is causin my car to do this?

Spark? what else could it be?

[race_snooze]

blowing out the spark?? car was set for 9psi now your running 15psi check gap take it to a work shop...

[paulr33]

if you are running 15psi and stock ecu you will be encountering the STOCK EXCESS AIRFLOW protection. turn the boost down and try again, i would suggest around 10psi at the most. this should work around the excess airflow protection

[paulr33]

oh crap its a gtr, my bad. i thought it was a gtst. sorry. my comments were based on me thinking it was 33 gtst for some reason. sorry (ignore my comments then)

[Stevie]

I think the excess airflow protection is commonly refered to as boost cut as turning up the boost generally results in more airflow.

But yes I whole heartedly agree with you.

[satanic]

Someone mentioned that on GTSTs there is a "defender" fix... what is this product?

SAFC? ECU? or something simple...