please can someone tell me what psi a standard turbo on a 1993 model should be able to go too?? i have done the exhaust, chip and filter and am about to do the intercoolers, boost controller, and injectors but still want to know what i can then push the standard turbo's too before i need to buy the new ones. i know i need to replace them soon but thought id run them till they die then replace. thanks in advance for any help

15 -16psi i think?

15 psi anything above it and they will croak it!

 

Injectors might not be worth the expense, I would rather spend the 600 quid on a set of skyline brakes, you will need em after all the other mods :D

Standard pressure is 9psi

 

You can push the turbos to about 13psi fairley safely but more than that the intercoolers are not good enough and the injectors struggling to supply enough fuel at higher revs greatly increasing the risk of detonation.

 

With uprated intercoolers and injectors, you can probably togo about 15psi on stock turbos, but they start to become ineffective and dont create a good flow I believe.

I have been told one bar is OK, by someone who rebuilds them

ok so let me get this strait.

 

It somewhere between 9PSI and 1Bar

 

Just thoought I would be sure, you know, just in case (6)

1 bar is ok

1 bar = 14.5037738 pound-force/square inch (PSI)

Mine run great with the Boost controller set to 14.5 on Hi :D

Been running 1 bar for over 2 years on standard tubs and injectors (and for a while, standard chip!) No probs here!

 

Steve :)

mines been running at upto 16psi on boost jets for nearly 3 years now :)

15psi is about right.

I ran mine at 15,16,17 & 18 while recording the MAF voltage. You get next to nothing more in terms of flow above 15psi at high revs, but looking at the compressor maps you're falling off the efficiency curve, so there's really no point pushing them past 15. 16-17 does feel better in the mid range, but you're much more likely to det. Also, the tubs probably aren't mechanically good enough for sustained running like that.

mines been running at upto 16psi on boost jets for nearly 3 years now :)

 

 

what chip upgrade did you have mate?????

what chip upgrade did you have mate?????

 

JWT

Above 15psi the stock tubs start to get seriously inefficient. Above that pressure you won't actually see any increased airflow due to the fact that the air in the outlet of the compressor on the turbo is reaching sonic speed - no matter how much harder you force it, very little increase in flow rate will be seen. Stock injectors should be good for ~370rwhp - stock turbos will not produce more than this, so the stock injectors and turbos are pretty well matched IMO. Fitting uprated intercoolers won't really have much benfit with stock turbos - certainly don't assume that you can run the tubs past there efficiency point with better intercoolers. Upgrading the ICs is more of a supporting mod than an actual power mod ;)

I have stock tubs reworked by Turbo Developments with 360 bearings( in summer by previous owner at £405 each)apparently they should handle 1.5 bar if needed too(obviously i would not run them at that with stock injectors anyway)would this sound right,just trying to gauge the potential of them,cheers,Tony :)

Long time no hear Tony how ya doing?

 

Unless you have got bigger injectors tony then it is really academic as the injectors run out of steam at 15ish psi!

 

One way to test the limits of the turbo with improved bearings is to get a charge temp gauge setup, I believe these can be cheaply made up from one of the interior/exterior car temp sensors, to monitor charge intake temperatures.

Tony, yes they probably would run at 1.5bar, however unless some major work has been done on the compressor housing, then you'll still hit the limit at ~16psi and no matter how much more pressure you run, airflow will increase by bugger all. Its not pressure that generates the power, its the amount of airflow that that pressure creates ;) In other words, you won't see that much benefit running above 16psi with them, they'll just handle the abuse for more miles than a stocker would under the same conditions :)

Hi Mark,how you doing mate,not been on here much,been so busy at work and with Christmas etc,hope you had a good one,i suppose if and when i take it to Thor they should be able check what the tubs can take. :)

 

Hi ya Andy,get ya drift,i will get in touch with Turbo Developments and find out exactly what they did,not sure which way to go with Z,no point fitting bigger injectors if the tubs cant handle it,strange question,but visualy can i tell what injectors i have fitted,as i dont have all the paper work on all the work done to engine,just seems strange that Nisstek would build an engine to take 30psi and the owner not do injectors at same time,unless of course he was going to fit them at later date,still,at least i know the motor can take the abuse quite easily in present form:)

 

Tony

555s have purple connectors on them - obviously you'll have to remove one of the connectors to see behind it ;)

mmmmmm,just been to check,sure there Black,as i have not long since fitted new connectors,have tried to remove new cap but there on well tight,dont want to pull to hard for fear of breaking one.

 

Tony :)

Tony, if you pull the map with conzult and email me it I'll tell you what it's set up for.

Tony, if you pull the map with conzult and email me it I'll tell you what it's set up for.

 

Just realised John,did we do this at your place few months back,when i next come over we can check again as i dont have Conzult anymore,Tony