I'm running a stock DET from a U12 in my pulsar, and I'm using the stock DE fuel pump from existing engine, etc, etc.

Car is fine, I've not had an issue yet. I'm wondering though, I've had a front mount i/c done, and its useless with only 6 or 7psi (stock boost).. the car is much laggier and it just generally feels slower. I'd like to raise the boost to take advantage of the nice new fmic. (say, 10 or 12 or even 14psi)

I'm wondering.. how much will the DE fuel pump take? hrmmmm.

I guess I need to think about fueling and also my running the stock DET computer as well.

Thanks
James

Hi, I think you need to get a bigger fuel pump ...Walbro 255, for anything over 8psi of boost, maybe even bigger fuel injectors to, I not sure if your turbo needs the bigger injectors maybe somebody could chime in about the bigger injectors.

the stock fuel pump starts to get shady past 9-10 lbs boost. i recommend an upgrade for anything past 9lbs boost.

Okay, I found out why the car was so laggy and slowish and die'inf off around 5 or 6k rpm... the turbo outlet pipe wasnt bolted down flush enough and there was like a 3mm gap there, had my hand in there while car was running and air was just pissing out of the turbo.. hrmm doh. that will explain the stalling, hessitations and only 6ish psi on the gauge.. fixed it up, took it for thrash.. 8.5 almost 9psi on gauge!! (note the boost is stock, no bleed valves, etc).. so my new fmic and pipes work a treat, woohooooo. very happy..

Was going to raise the boost this week with a bleed valve, but if a new fuel pump is required for anything over 9psi, then I dont think I will do anything till I aquire one.. would an S14 or S15 pump be okay? is it a drop in replacement?

How much can the stock injectors take on an SR20DET? boost wise....

Whats an ideal injector upgrade? (drop in replacements)

Thank you.
James

the most those 370cc injectors should see i think is 12lbs. some people have run 14 but i recall hearing that the turbine efficiency drops after 13lbs. you can get nismo dropins they are like 555cc the s15 injectors are 450cc, they can fit. injectors from a certain other cars by other manufacturers can fit. SARD makes a 550cc kit.

but what does it matter the injectors you have are good til your turbo runs out. so get bigger injectors with a turbo upgrade. otherwise its kinda not neccessary unless you are wanting to upgrade one part at a time.

the most the 370's should see is 11.5 to 11.75 psi, above this you might be taking chances. i wouldn't take it much above stock boost without upgrading the fuel pump. with MSD 50LB and a cobra, or z32 maf you could max out the T25 around 14psi and still have plenty of fuel i think.:cool:

Also, when you upgrade your injectors, you will need to re-program your ECU or do something for engine-managment. I know you are in Australia so JWT isn't an easy resource for you over there.

We can get JWT here, infact a local tuner is a distributer for Australia. However.. expensive!

I'm considering a MOTEC M4 ecu, or the new revision Wolf 3D (version 4) which also looks good for the price...

At this stage I want to boost her up, without blowing her up. On stock ecu, stock injectors, MAF, etc, etc.

I just aquired a manual bleed valve (FESTO), so I might put it in, and very gently test a psi or two above stock... I'm hitting around 9psi when its really cold outside.. and boost is stock (6ish psi factory set)... fmic is working wonders :)

If anyone wants to check out my new fmic and other stuff, check :
http://www.rollaboyz.org.au/members/james/fmic-etc/
Some polishing and other work going on shortly.... she's getting there :)

Cheers..

hellow, i have a 91 se-r with black top avenier det/front mount /wal 255 fuel pump. i run 12 psi with the stock 370cc injectors. i have an a/f gauge and i dont lean out at all,iam also useing a bb ecu. once i get my 3in pipeing i will run 14psi and race fuel when iam at the track,lets see what that does??.

A/F guages dont work for beans.

install an EGT and see how it is doing.

12 psi on 8.5:1 CR should be fine, in cali, you are risking it, but i believe PULSSSAR can get better pump gas than 91 down under.

Very nice! Do you know Glenn Lumpy Cambell?

I have a fmic too on my nx2000 and hot or cold, my gauge always indicates 7 psi. Is it related to the fact that my wastegate vaccum reads after the intercooler (between the intercooler and the intake)?

Yeah we have a couple of fuel options, Premium Unleaded fuel which I believe is 94 or 95 octane.. and now Ultimate 98 (optimax, vortex, etc) which is 98 Octane...

EGT? who/where/what?

Yeah I know Glenn 'Lumpy' Campbell, a well known nissan tuner here.

Black top Avenir engine has a ballbearing T25 on it? I can't remember, but it has simular performance to a Gti-R engine afaik.

djisnx2000, 7psi isn't bad, remember 6psi is pretty much stock figure... Where does your piping run? Are the pipes long... plumbing the wastegate boost signal into the location you have it in, should be fine...Thats where it is on the stock pipes...

James

http://www.photomania.com/~nx2000/
click on "NX2000 (19 photos)"

The pipes goes from turbo, U turn under the foglight, intercooler, then passes under other foglight, climb beside the radiator and goes to the trottle body.

I think the path isn't too bad...

Oh yeah and an EGT gauge means exhaust gas temperature. It allows you to know the temperature of the gases after combustion. It can also be used as an a/f ratio meter. If there's too much gasoline, that additional gasoline will absorb heat. So on your EGT, if you see the temp goes down, it means there's too much gas. If there's not enough gas, the temp will go up.

sniff, sniff brings a tear to my eyes when I see u guyz talk about EGT gauges. Seems like not too long ago nobody talked about them. Hey Pulsar R u running the BB Ecu or the DE ecu? and dosen't your car stall out on you with that Venting Bov? and live a little u got good gas crank it up to 10psi and enjoy the ride.


Ohh yeah almost forgot. On the Stock pump at like 9-10psi the EGT's will go way past 900 (Greddy gauge) in 4th gear. Seen PssshhgoesmySR20's do that when we 1st installed the turbo kit on the 370cc's. ohh it was on a T3/T4 at that boost level.

I run the DET ecu, car doesnt stall that much really... car doesnt backfire much either, infact, during gearchanges its generally fine, but idle is dodgey... could be my TPS though, i just whacked it on in any old place almost hahaha...

10psi? 14 sounds nice. after fuelpump and ECU are upgraded :)

EGTs are better than A/F because you can still blow up with a fat fuel mixture. remember, lots of boost, fuel and timing advance all lead to higher combustion temps.