Finally got around to installing these tonight. Took the intake manifold and crap off the car, did a compression test (175psi-180psi all around, the same as when I put this engine in) installed new 2-step colder plugs and the injectors.

The pintle caps were broken on most of the injectors, and I couldn't figure out a good way to take the caps off my A32 injectors without breaking them, so I put the injectors in w/o them. If need be I'll pull them out again to install them at a later time.

Set the base fuel pressure to 22psi (I did this before removing the stock injectors). The car started right up, and idled great! After starting I think it runs a little richer than with the stock injectors, because my idle EGT's are only around 700F, while they were 800F with the stock ones.

I put in a 3:1 FMU disc and took it out for a spin. Feels great, just like the car did before the injector change. Around 1300-1350F for WOT runs, same as before. Now my max fuel pressure is right around 40psi (didn't catch the exact number). I feel much better with this setup opposed to running almost 90psi through the 240cc injectors.

Tomorrow I'm going to the track to see what she can do. Its the last day the track is open, plus will give me a good oppertunity to "shake down" my new setup.

 

good job...

what are the drawbacks to running low base fuel pressures?

 

Good deal man.

I have also thought about using the FMU for this, instead of the ECU.. time wise.

but who knows what I'll do..lol.. gotta change the motor first.


Good luck at the track

 

Drawbacks of lower FP? Some have thought that fuel mileage would suffer, but MardiGrasMax said that he hasn't noticed this. After I go through a full tank, I'll let you guys know if I notice a difference.

Track is closed today. Damn mother nature. I don't think they're going to be open again until April...so I won't know for quite a while what the car can run. I do plan on hitting a dyno something soon for some tuning though.

 

I also want to use the 370cc ZTT injectors. My question to you, what is your boost pressure set to??? Are you getting these numbers at 5psi or 10psi??

 

13.39@106.9mph

 

Whose times are those?

 

Nice, what type of FPR are using? and where did you get it? I will have some 300Z injectors soon.

 

~11psi boost.

Well, like I said, the track is closed for the season. In the next month or so I'm going to dyno and get tuned. In the spring I'm going to get a 3" exhaust, and then think about an IC. I think I'll also get slicks, as I doubt I'll run a 13.4 with this setup because of traction.

SARD FRP. I got it from Thomas (sx7r).

 

So whats your fuel mileage looking like?

I got my 300Z injectors a week ago. I am itching really bad to put them in. I am looking at the fact that it brought your EGTs down. I guess is time to buy a SARD and 4:1 FMU disck. Ill fine tune it w/the SAFC.

 

My fuel mileage has actually gone up a bit since converting to 370's, but I'm pretty sure that is due to the JWT ecu. Anyway, using larger injectors doesn't mean you have to be running richer all the time. It's a matter of tuning.

 

Don't know yet. After putting the injectors in I put like $5 of gas in, because I thought I was going to the track the next day...but didn't.

Since then I filled the tank but haven't needed to re-fill yet. I can this weekend to figure out my mileage.

I don't think my EGT's went down that much. Just my idle. Crusing on the highway or WOT they seem just about the same.

I gotta hit the dyno and tune...I put a call in to a "local" (hour and a half away) shop for an appoitment, but I haven't heard back yet. There are a bunch of dyno's in the area, but none of them have wideband O2's...I can't understand why though.

 

That sucks, I wish you were here. You know I paid $50 to dyno here in Atl. The time when me and Baggs raced those LT1's, and LS1's. The one guy is a tech and he referred us to this guy with a brand new dyno machine next to his house in a brand new warehouse. Good thing he has a wide band O2 sensor. But if your ever around here bring it, PM me Id be more then happy to take you there. I bought these injectors right here

http://images.cardomain.com/member_i...87_36_full.jpg

 

Yeah, there are a bunch of places up here that I can just do number pulls for around $50, but no tuning. I have to go to Toronto (just south of it) to get tuned. Its like $250CDN, which is a little over $100 or so, which isn't that bad in my book.

Plus its a fun drive! Can't beat the QEW!

 

Filled her up today. 242miles, 11 gallons - just about 22mpg, which is actcually better than normal for me. However, about 130 of those miles were highway, which I rarly do anymore.

Typically I was gettting about 25mpg highway, and around 17mpg city. It will be interesting to see what I get on a tank of just city driving.

 

vroom vroom!

those dont look like too bad of numbers, i can't wait to get your pulley!

 

how do u know what the guel pressure is ? is there a way to lower the fuel pressure without haveing a fuel pressure guage? I thought mardigras had this on his website, but i cannot find it

 

I know because I have a guage. To lower the FP you need a adjustable FPR....I suppose you don't need an in-cabin guage, but you'd at least need a mechanical one for underhood to make sure you have your base pressure set right.

That being said, if you're going to boost, there's no reason to do so without an in-cabin fuel pressure guage.

 

This can't be stressed enough. The health of your engine depends on adequate fuel delivery. If you are thinking of installing a turbo or supercharger with a rising rate fpr (fmu), the first thing on your to-do list should be installing the fuel pressure gauge and the EGT gauge.

 

Kev learned the HARD way, when his aux fuel pump crapped out. Apparently, he didn't notice his EGTs being higher, but once he got on the dyno and saw his A/F ratio, he pulled the plugs(toast) and did a compression test that turned up a bad cylinder or two.

All that could have been prevented by a simple in-cab fuel pressure gauge.

 

Thanks, now I know what not to do!

 

@ 11PSI what is your FP? Today I boosted 8.8 - 9.2 PSI and saw the FP was over 5300KPA which is about 77PSI. Thats alot of FP for the 300Z injectors and 8-9.2PSI. I d like to get an estimate what is good for 10PSI with these 300Z injectors. I thought the 2.22 disc that the SFMU has was too small but seems to be just right. Just may need to bleed off unwanted boost like the cartech

 

At 11psi I'm around 45psi of fuel pressure. 77psi with the 370's seems _way_ to high!

 

You're putting 325 hp down to the wheels, if I remember correctly. That's getting close to 400 hp at the engine. If you shoot for a BSFC of .6 (on the rich side) and assume injector duty cycle is maxed out at 100% by the time you get to 10 psi, then 56 psi fuel pressure should work for you:

 

I really appreciate this information, Thanks alot! I am aiming for 10PSI but will probably boost 9.1-9.4PSI. I throw the .? in there because I dont want to pull another engine again too much work to do.

I am not going to blame the turbo for the first engine as two separate incidents happened.