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Discussion Starter #1
Okay guys, this may be a bit of a read but i just want to make sure you have all the info before you give me any advice (sorry for some of the waffle).

Took my car into a motorsport garage to get some new bits fitted to my R33 Gtst. The bits getting fitted were some iridium plugs, HKS front pipe, HKS fuel cut defender and also a greddy profec boost controller.
The car already has a HKS exhaust, HKS air filter and Blitz BOV.

When i took the car in, i told the guy that i wanted the boost upping to 0.8bar and have it running sweet, Although he is not a skyline specialist he know's his stuff (obviously) and said he would crack on with it.

Got a phone call today saying it was all done, but the car is only running 0.6bar of boost. He told me that testing it above this level he was getting detonations at about 6500 rpm. and in all possibility the car was running lean.

He seems to think it maybe the fuel pump regulator is either 'tired' and not performing as well as it should, or maybe that it is not up to the task of handling the higher boost.

Not sure if it makes a difference or not, but he also said that the charge temp was around 50 degrees which he though might be a little high, but not damaging. (I only have a standard intercooler at the mo, but it will be on my next upgrade)

Would the fuel pump also contribute to the detonations?

He agrees he is not a skyline expert, so i said i would post on here to see what you experts would say and give him any advice (via me)?

So what kind of Bhp would the standard fuel pump and regulator be able to handle before they need replacing?
Would i be best off buying something like a sard adjustable fpr and/or walbro fuel pump?

Any of you guys have these problems? how did you have them fixed?




Just as a footnote. He took the car for a drive last yesterday to see how it was performing before the new bits went on and said it was running sweet, and later that night he was on the web getting prices for GTst's and GTR's as they feel loads better than his evo!!! lol
 

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Punch me.
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Okay guys, this may be a bit of a read but i just want to make sure you have all the info before you give me any advice (sorry for some of the waffle).

Took my car into a motorsport garage to get some new bits fitted to my R33 Gtst. The bits getting fitted were some iridium plugs, HKS front pipe, HKS fuel cut defender and also a greddy profec boost controller.
The car already has a HKS exhaust, HKS air filter and Blitz BOV.

When i took the car in, i told the guy that i wanted the boost upping to 0.8bar and have it running sweet, Although he is not a skyline specialist he know's his stuff (obviously) and said he would crack on with it.

Got a phone call today saying it was all done, but the car is only running 0.6bar of boost. He told me that testing it above this level he was getting detonations at about 6500 rpm. and in all possibility the car was running lean.

He seems to think it maybe the fuel pump regulator is either 'tired' and not performing as well as it should, or maybe that it is not up to the task of handling the higher boost.

Not sure if it makes a difference or not, but he also said that the charge temp was around 50 degrees which he though might be a little high, but not damaging. (I only have a standard intercooler at the mo, but it will be on my next upgrade)

Would the fuel pump also contribute to the detonations?

He agrees he is not a skyline expert, so i said i would post on here to see what you experts would say and give him any advice (via me)?

So what kind of Bhp would the standard fuel pump and regulator be able to handle before they need replacing?
Would i be best off buying something like a sard adjustable fpr and/or walbro fuel pump?

Any of you guys have these problems? how did you have them fixed?




Just as a footnote. He took the car for a drive last yesterday to see how it was performing before the new bits went on and said it was running sweet, and later that night he was on the web getting prices for GTst's and GTR's as they feel loads better than his evo!!! lol

this guy is an expert tuner yet he does not know if it is running lean or not?, he does not have a wideband kit? or he didnt rig it up?

he doesnt know if 50 degrees is too hot for the inlet?, if it could be the fuel pump?

are the above questions his or yours?, no tuner that knew about tuning engines would not ask these questions

what plugs do you have in the car now (as in heat range)
 

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Discussion Starter #3
Maybe i have worded some of this wrongly then, and i am confusing what he said with what i 'think'

He said it is running lean and that the charge temp is running about 50 degrees so the intercooler would ideally need changing but with the colder weather here/coming it is not a major thing.

As for the fuel pump regulator he said this is the reason it is running lean. and as for the spark plugs, i am not 100% on the heat range until i get the car back tomorrow, but was recommended the ones fitted today buy the jap specialist i bought them from after i told him what was fitted to the car and what was getting fitted.

Unfortunatly i am not good with engines so, when people start saying certain things down the phone to me then they may well be speaking a different language. I am still fairly new to car modding, but i am trying to learn, this is why i am asking these kind of questions on here.
 

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Punch me.
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Maybe i have worded some of this wrongly then, and i am confusing what he said with what i 'think'

He said it is running lean and that the charge temp is running about 50 degrees so the intercooler would ideally need changing but with the colder weather here/coming it is not a major thing.

As for the fuel pump regulator he said this is the reason it is running lean. and as for the spark plugs, i am not 100% on the heat range until i get the car back tomorrow, but was recommended the ones fitted today buy the jap specialist i bought them from after i told him what was fitted to the car and what was getting fitted.

Unfortunatly i am not good with engines so, when people start saying certain things down the phone to me then they may well be speaking a different language. I am still fairly new to car modding, but i am trying to learn, this is why i am asking these kind of questions on here.
ah that makes much more sence:apint:

he says running lean and thinks its the regulator...he is the only one who has seen the car so id go with that opinion for now, get a sard

get back to us on heat range
 

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AKA RSP
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I wouldn`t buy a regulator as it may not even be the problem. If he thinks its a regulator/fuel pump problem the first thing to do is check that the fuel pressure rises and holds on boost. Also check the AFR`s to be sure it is running lean/rich. Could also be a duff AFM making it run lean.

There are so many things it could be I would try diagnosing the problem before chucking loads of money at it on parts that may not be required!
 

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Punch me.
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9,398 Posts
I wouldn`t buy a regulator as it may not even be the problem. If he thinks its a regulator/fuel pump problem the first thing to do is check that the fuel pressure rises and holds on boost. Also check the AFR`s to be sure it is running lean/rich. Could also be a duff AFM making it run lean.

There are so many things it could be I would try diagnosing the problem before chucking loads of money at it on parts that may not be required!
i thought the tuner did diagnose the problem?, he said running lean due to faulty regulator:confused:


"As for the fuel pump regulator he said this is the reason it is running lean"


i was thinking exactly the same thing as you after reading the first post though:apint:
 
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