supercharged 96 cobra injector size?

yfz162 · 04-27-2009

OK, i went to another pulley on my car and took it in for a new dyno tune. The guy that originaly owned the car put the blower on and he told me it had 42# injectors in it. Well, the guys @ the shop told me it only had 24's according to the color of the injectors. Now, they are also telling me they appear to be flowing way more than 24's should capable of. They are telling me the factory 24's could have been drilled out and resized to flow more fuel. Has anyone heard of this being done? I am supposed to take them out and have them flow bench tested so the tuner knows exactly what the injectors can flow before they can properly tune the car. Any suggestions on where i can send them?????

lightning98 · 04-27-2009

what color are they man?

yfz162 · 04-27-2009

Well, they appeared green to me when i had the car apart during rebuild. The shop told me they should be bright green and they are not. I would say they are a teal/torquoise color....... I called a place today in MN that can flow test all 8 of them for 40 bux. Gona pull them out tonight and ship them off i guess. If they are 24's i am gonna be in the market for some 42's. Should i buy a new MAF if i am going to a set of 42's? I hear the lightning MAF is a good match for the 42's. Are the wiring connectors the same or will i have to cut wires???

Thanks!

lightning98 · 04-28-2009

I would just go ahead and buy the SCT 2600 maf dude its only like $240. and yea im pretty sure that 24s couldnt support that much power i would think that they are 42s man

2Manystangs · 04-28-2009

I have 60# on my Cobra/Kenne Bell and the SCT 3000 MAF...also you should upgrade the fuel pump to a 255 lph unit...from there it's just chip and tuning, and tuning and...having fun ! Runs fab and smoothly strong with no worries.

2Manystangs · 04-28-2009

Another issue with the 96 cobra is that the computer is not quite as compliant to chip/tuning as later models, it's kinda at the forefront of modern electronics, but just stay with it and it will get there...

yfz162 · 04-29-2009

Well the guy also told me it has the t-rex fuel pump in it, but the car has an fmu as well and that makes me wonder. The fmu set up is making 75-80psi of fuel rail pressure @ 8-10 psi of boost. I now understand why with only 24# injectors. When i thought it had 42#'s i couldn't understand the need for such high fuel pressure. Anywho, my tuner is telling me i can swap my MAF and injectors out and the car will run ok (staying out of full throttle or boost) to get me back to the dyno. Does this sound right to anyone? I am going to pull the fenderwell and see what size my MAF is. I am looking @ a really good deal on some 03-04 cobra 39# injectors and plug adapters. Can i swap the injectors out, keep my MAF and still be able to drive my car over 100 miles to the dyno????? My tuner says yes, what do you guys think??????

lightning98 · 04-30-2009

i would haul it man.

Txnavyman10 · 05-01-2009

there should be a part number on the injectors. Just google that part number and it should come up what size injectors brand and everything.

xTomKx · 05-01-2009

It is possible to modify certain injectors to increase flow rate. Most Nissan injectors can be moded by grinding off the end cap.

2Manystangs · 05-01-2009

Well ultimately what is the issue? Are you running lean? Is the engine cutting out out at high rpms? Just change the injectors/MAF and then retune it...if you have no driving issues, why change to begin with? It's the air/fuel ratio under boost that should be your main concern, a wide band monitor should be in any boosted car...don't cheap out when you potentially have thousands at risk by blowing the engine...a stock 96 cobra is not really made for tons of un cooled boost, the rods and pistons are not forged, keep it safe and err on the side of caution at all times

yfz162 · 05-06-2009

The motor was rebuilt with Probe forged pistons and Manley H-beams with meth. injection, so the motor is fine. The problem is the injectors are too small to feed the car @ full boost. I pulled them and they are stock 24's. So, i purchased some 42's and a 90mm lightning MAF and i am ready to install the MAF. The wiring harness that came with the lightning MAF appears to be the same plug style as the one that came out of my car, so can i just plug and play (other than tuning) or do i need to cut and splice wires with the wiring harness that came with the 90MAF????? May sound like a dumb question, but just want to do it right the first time!
Thanks again fellas

!!

2Manystangs · 05-06-2009

Not sure about the MAF sensor install, my tuner says the SCT 3000 is the one to go with, it's what I have since it uses modern tunable electronics/chip...have to say, my car runs fab with it and 60# injectors and SCT chip/tune

yfz162 · 05-08-2009

OK, installed both injectors and lightning MAF. I started the car and it is def. running rich compared to with the 24's. I am going to haul the car to the shop that is handling the tuning. Here is another stupid question..... The 90mm MAF is a 4" housing and the rest of the tubing leading to the blower is 3.5". I bought a reducer coupling to mate the MAF with my existing tubing. Could this be causing the rich condition by choking down the air flow after the MAF? The inlet to the blower is only 3.5" so i would have to reduce it anyway, but should it be just before the blower or does it matter????? Should i go with a power pipe? Don't really want to cut on my hood though.... Any help is appreciated guys.

Thanks again

lightning98 · 05-08-2009

[quote=yfz162;1526774]OK, installed both injectors and lightning MAF. I started the car and it is def. running rich compared to with the 24's. I am going to haul the car to the shop that is handling the tuning. Here is another stupid question..... The 90mm MAF is a 4" housing and the rest of the tubing leading to the blower is 3.5". I bought a reducer coupling to mate the MAF with my existing tubing. Could this be causing the rich condition by choking down the air flow after the MAF? The inlet to the blower is only 3.5" so i would have to reduce it anyway, but should it be just before the blower or does it matter????? Should i go with a power pipe? Don't really want to cut on my hood though.... Any help is appreciated guys.

that isnt a problem man. good luck on your retune!