Seimens 60#ers vs Seimens 80#ers on a mid to high 10 sec, full weight combo.

Mr.Spool

Well-Known Member
I have to agree with this.
Yes I’m green to this and I’m crazy but I’m not stupid. I can understand when people explain it to me like you did.
Thinking back
With the new engine management systems they have now. You can adjust your fuel cylinder to cylinder.
So that means flow matched injectors are not needed at all.

And for the average guy I’d take the $100 that you will Save from not buying flow matched injectors.
And get a rjc race plate.
Individual cylinder correction is not needed at all on a 10 sec car.rjc plate only attempts to correct the airflow and does a great job.
 

Qicsan

New Member
And if you think about what you paid extra for I have to ask ... do you know why you got them ???

Lets say they are all identical in flow ... does each cylinder flow the same amount of air ? Can you adjust anything on a cyl by cyl basis ?


Well, I've read everyone's post and all have valid points on flow matching pros/cons.
Here's a simplified answer.... Bison's post validates (to me anyways) why paying for flow match is a plus.
"
bison said:
The SD 80 aren’t 80 unless the pressure is in the 50’s. The SD 60’s are a little over 60 with pressure in the low 40’s. So expect 15-20% more fuel out of the 80’s with similar pressures"

I wouldn't know this if Bison did not say it unless I have had a set flowed (matched or not) so yes spending that extra $$$ is worth it if inj don't flow their advertise flow rate at 43.5PSI especially if these SD80's are really 72lbers per Bison post, much needed info for basic tuning purposes as opposed to worrying about individual cylinder tuning.
My 2cents.
 

Qicsan

New Member
The SD 80 aren’t 80 unless the pressure is in the 50’s. The SD 60’s are a little over 60 with pressure in the low 40’s. So expect 15-20% more fuel out of the 80’s with similar pressures


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So Bison the SD80's you had flow were they actual Siemens Deka or could they have been possible knock offs (Without the DEKA stamped on them) just asking. I know there is a lot of Chinese ebay shit floating around now.
 

bison

Moderator
Staff member
So Bison the SD80's you had flow were they actual Siemens Deka or could they have been possible knock offs (Without the DEKA stamped on them) just asking. I know there is a lot of Chinese ebay shit floating around now.

They were SD. I didn’t have them flowed.i flowed them. It wasn’t a one time thing either. Others have reported similar. Also as I stated they weren’t a problem.


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