What's the truth?
I have an Rtek 1.7 ungraded ecu and injectors from a gslse of unknown year. I am wondering how much these injectors really flow?

Does anybody know for sure what the gslse injectors flow at?
I have heard that many gslse injectors actually flow test above 720cc's.
After reading other threads on the site, it seems that 84' gslse injectors flow @ 680cc and that 85' gslse injectors flow @ 720cc. Can any of you confirm/refute this?

Have any of you flow tested 84' or 85' gslse injectors and come up with different numbers than the ones suggested above?

Lastly, I was wondering if there is a way to tell the difference between 84' and 85' injectors. So I could figure out which year mine are from.

HHTurbovert

 

bump!

 

you might have better luck posting in the 1st gen section but i've only heard 680cc.

 

I posted it in the 2nd gen section because I know that many people with S4 turbo's are considering using the Rtek 1.7. If the gslse injectors actually flow 720cc's then they could be used with the the Rtek chip. This would make the Rtek upgrade an even more economical option since the gslse injectors can be purchased much cheaper than Aftermarket injectors.

 

nobody knows?

 

I think you have a couple issues:

1. Even if some 680s flow like 720s would you really want to take the chance without flow testing them. Flow testing obviously increases the cost.

2. You would lose any warranty with Rtek since they require 720cc plus.

3. I guess you could go ahead and hope for the best and monitor AFR with a wideband to be safe. But then again widebands cost money.

I don't think there is a conclusive answer but maybe if you email Hitman or someone else that rates the 680s as 720s you'll get a more definitive answer as to why they say so.

 

The last time i orders a set of gslse injcetors from python injection, it was listed as 680cc. They only had one listing on it. This was a few years ago.

 

https://www.rx7club.com/showthread.p...ght=19550-1370


they should be the first set that Kevin listed.

680's i have seen a few dyslexic people refer to them as 860's

 

Even if the GSL-SE injectors do only flow 680cc/min, the flow difference between a 550/720 combo and a 550/680 combo is only 3%.

 

there was a guy not to long ago that had his 680's cleaned by cruzin performance and they benched his at 720.

 

IIRC they were rated at 680cc at a lower pressure.

 

That's the catch right there. Injectors are rated at both a flow and pressure. One number alone is completely useless. My guess is that the GSL-SE's EFI system ran at a lower static pressure, and that's the pressure at which they will flow 680cc/min. If they flow ~720cc/min at the FC's 250kPa (36psi) static pressure, then I'll bet the GSL-SE used a static pressure of ~225kPa (33psi).

 

Buddy of mine sent his into RC Engineering, one had an external crack and was toast, the other flowed at 680. This was an 85 GSL-SE.

Good point on the fuel pressure, I never looked at the FSMs for the different years to compare fuel psi between the S3 and S4.

 

I just looked in the S3 FSM, I couldn't find the fuel pressure anywhere. What section should I be looking in?

 

the orange top 84/85 stock injectors are 680, i dont know why the 720 number gets thrown around so much??????

 

I know they are rated at 680, but I have seen many post from people who have had them cleaned and flow tested who say that the injectors flowed at 720.

 

In case you missed it...

 

i got gsl se injectors from mazdatrix and they said they flow 720 on a fc i dunno what they flow on a first gen i think NZconvertible is right.