injector question

[Anubis_4_99]

i've heard of some dsmers useing RX-7 injectors and was wondering what modifications were required to make them fit properly and what kind should be used? im pretty much maxing mine out i think and need some more fuel

 

[ken inn]

you have to make sure you get the correct ones. i had the 550's from a turbo 2, and i think there was a change in impedance, somewhere they went from low to high impedance. if you look at the connector socket, it will be rectangular, and the centering notch will be in the center. i believe the high impedance ones are oval, and the notch is offset. the pintles are a tad larger, and the length is a tad longer, but they fit. these have been around a long time, so if you do get them, get them cleaned and flowed. the set i got had a couple that were plugged, but they opened up with extra cleaning and ultrasound. they flowed dead on after cleaning, and they worked very well.

 

[Anubis_4_99]

so what exactly is needed to be done to make them fit properly? or are they basicly a direct swap?

 

[sweet97]

i've heard of some dsmers useing RX-7 injectors and was wondering what modifications were required to make them fit properly and what kind should be used? im pretty much maxing mine out i think and need some more fuel

Your vehicle profile is not filled out. What turbo are you running? How much boost? What fuel pump/AFPR? Thanks, Mark

 

[Anubis_4_99]

i'd fill it out if i had anything to fill out.. the only thing changed for sure on my car is a small fmic and i have a boost controller, runnin 17-18 high and 7 low, i dont run high much because i've been told it runs lean uptop so im trying to get everything together to upgrade my fuel system.. i've only had the car for about a month and was told many thing's when i bought it, was told the turbo, tranny, and a couple other thing's were replaced, i've learned the tranny wasnt, so im doubting the turbo was either but i dont know for sure

 

[sweet97]

Well you can't go with bigger injectors without some way to control them. Start with a Walbro 255 HP pump-$95. Get one of those fuel pressure gauges that attach to the to of the fuelfilter, not sure where, maybe Summit? ANYONE KNOW? You will need an AFPR to control the pressure the pump puts out. $145. from www.fullthrottlespeed.com Check out the MAF-Translator and Scanmaster there also. The translator is an easy way to control the fuel and assist in tuning. Back off on the boost until you are running safely to save the motor.
There are options to what I stated here. Do searches and check out the staged mods for the 1g here at tuners. You have lots to learn. I have lots to learn 1 year and several thousand dollars later! My tranny went 2 months after I got the car-$3000. with clutch kit-TRE spec.Mark
PS: The pump rewire and an AFPR would get you by. www.vfaq.com is a good source for info on things like the rewire.

 

[flinguist]

Well you can't go with bigger injectors without some way to control them. Start with a Walbro 255 HP pump-$95. Get one of those fuel pressure gauges that attach to the to of the fuelfilter, not sure where, maybe Summit? ANYONE KNOW? You will need an AFPR to control the pressure the pump puts out. $145. from www.fullthrottlespeed.com Check out the MAF-Translator and Scanmaster there also. The translator is an easy way to control the fuel and assist in tuning. Back off on the boost until you are running safely to save the motor.
There are options to what I stated here. Do searches and check out the staged mods for the 1g here at tuners. You have lots to learn. I have lots to learn 1 year and several thousand dollars later! My tranny went 2 months after I got the car-$3000. with clutch kit-TRE spec.Mark
PS: The pump rewire and an AFPR would get you by. www.vfaq.com is a good source for info on things like the rewire.

You don't need all that fancy stuff. Get a used 3000 GT VR-4, or Celica GT-4 denso pump off of EBAY. They flow 180 LPH, are cheaper (got one for 40 bucks), and don't whine like those f'n Walbros. You also won't excessively overrun your fuel pressure regulator, and will probably be able to tune w/o and AFPR. Read this from RRE- http://www.roadraceengineering.com/fuelpumptechtip.htm You'll need an SAFC to control your larger injectors. RRE has a lot of info. on this page-http://www.roadraceengineering.com/ecltechtips.htm Read about AFC's.

 

[flinguist]

Oh yeah, here's a post from DSM Talk about using RX7 injectors. http://www.dsmtalk.com/forums/showthread.php?s=&threadid=72368
Here's some more SAFC tuning info.-http://www.geocities.com/ftrkeaka/mastuning.htm

 

[Anubis_4_99]

Back off on the boost until you are running safely to save the motor.

thanks for the info guys.. and i rarely run high boost, i keep it to 7 pretty much all the time

 

[oldman]

thanks for the info guys.. and i rarely run high boost, i keep it to 7 pretty much all the time

Who ever you're getting your info from either don't know shit or is misleading you. With the stock fuel system You can safely run at about 15-16 psi, anything higher would require a fuel pump upgrade and you will need an afpr for anything greater than 190. If you're having trouble now running 15-16 psi, your problem is some where else. Another words, you don't need bigger injectors, now yet anyway.

BTW It's impossible to run at 7psi unless,

1. You have a bad actuator.
2. You've disconnected the actuator arm.
3. Huge boost leak.

Because of this, I think you have other issues. What prompted you to look into biger injectors anyway?

 

[Anubis_4_99]

im running approx 7 low, i dont know for sure but i know its not over ten, im haveing no problem running my high boost when i want to.. what prompted me to look into bigger injectors was me posting a log and being told im running lean uptop, and my injector duty is 83% or something and i read somewhere that that's about what you want to run them max.. i dont remember exactly.. as for other issue's, i have none that i know of, everything is in good working condition, and i know i have no vac/boost leaks

 

[oldman]

im running approx 7 low, i dont know for sure but i know its not over ten, im haveing no problem running my high boost when i want to.. what prompted me to look into bigger injectors was me posting a log and being told im running lean uptop, and my injector duty is 83% or something and i read somewhere that that's about what you want to run them max.. i dont remember exactly.. as for other issue's, i have none that i know of, everything is in good working condition, and i know i have no vac/boost leaks

Playing with the boost level without a real boost gauge is a big no no. Do you have the link to the thread with the log you're speaking of? Maxing out the 450s at 16psi with a 14b doesn't sound right to me, there has got to be something else.

 

[Anubis_4_99]

i've got a real boost gauge, i just dont pay attention to it very often, i just glance at it occasionaly.. i'll look for the post with my log..

 

[Anubis_4_99]

http://dsmtuners.com/forums/showthread.php?t=171390

that's the one with my log.. i dont know how to post the entire log so i had to split it up..

http://dsmtuners.com/forums/showthread.php?t=173773

and that's the thread i read about injectors.. i was off a bit, it was 85% was what he said was approx max, i dont know if that's true or not, but i wanted to upgrade my fuel system anyway

 

[flinguist]

Please update your profile. Do you have an auto. or manual trans.? If you have an auto. your injectors are only 380 cc/min.. That could be why your running lean. You should also change your fuel filter, and use some Stabil, or other fuel additive that cleans injectors. That'll help the fuel sys. run to it's capacity.

 

[Anubis_4_99]

i wont drive anything auto.. all i asked was how to make the RX-7 injectors fit, my questions been answered.. and like i said before i dont have anything worth mentioning to put in my profile

 

[oldman]

i wont drive anything auto.. all i asked was how to make the RX-7 injectors fit, my questions been answered.. and like i said before i dont have anything worth mentioning to put in my profile

What kind of attitude is that. I've actually been researching for the last hour so I can give you a accurate answer about your log, I'm sorry we have wasted OUR time on you.

 

[Anubis_4_99]

i wasnt getting an attitude with you, geez, i was in a bad mood because my one year old left the window open over our 3 mons olds crib, sorry about haveing an off day, i appriate your time and info, but im human and have off day's sometimes

 

[steve]

Just a suggestion, but picking up a set of used EVO VIII injectors might be a better bet.

One, there going to have less miles.
Two, you know that they are low impedance instead of guessing which old RX7 ones are which.
Three, they have OEM fit.
Four, they have better deadtime numbers than the stock 450s unlike most other injectors.

If you watch you can find them for $150-$200.

Steve

 

[Anubis_4_99]

wanted to apoligize, i was in a bad mood earlier, and i didnt realize that the vehical profile menu went that far down otherwise i would have filled it out, sorry bout that.. but i do apriate peoples time and advice, i just logged on at the wrong time, sorry again

 

[oldman]

wanted to apoligize, i was in a bad mood earlier, and i didnt realize that the vehical profile menu went that far down otherwise i would have filled it out, sorry bout that.. but i do apriate peoples time and advice, i just logged on at the wrong time, sorry again

No big thing, I apologize for being harsh as well. I was unable to figure out why you're maxing the 450s out so early but I would suggest looking into why you're able to boost under 10 psi, a boost leak test wouldn't hurt. I really think you should hold off on the injectors until you know which turbo you want to end up with so you don't end up doing it twice like I did. For now, you should be safe @ 15psi, just make sure you test log. Good luck, especially with the kids.

 

[rob_rousseau]

Correct me if i'm wrong ppl, but isn't the stock 1g WG actuator a 6 or 7 psi unit and the extra 3-5 psi is achieved by the BCS bleeding pressure?

 

[oldman]

Correct me if i'm wrong ppl, but isn't the stock 1g WG actuator a 6 or 7 psi unit and the extra 3-5 psi is achieved by the BCS bleeding pressure?

Both of the actuators I tried on my 16g were 12psi, one of them was off a 14b. I have read many threads which states any where between 10-12. Maybe you can try it and let us know.

 

[steve]

The FSM says a 1G MT will make 6 to 10.8 psi with the BCS disconnected and plugged where a AT should make 5.4 to 9.9 psi.

Steve

 

[oldman]

The FSM says a 1G MT will make 6 to 10.8 psi with the BCS disconnected and plugged where a AT should make 5.4 to 9.9 psi.

Steve

I don't know Steve, you and I have helped many people trouble shoot boost related issues where bypassing both mbc and bcs was a usually occurrence and none has ever report back running 6psi. In fact I asked DSMmotorsport when I bought the 14b actuator for testing and they told me it should be around 10psi. But if that what the FSM said, that's what it should be then.