How to setup tune for 60lb injectors

[Mike04]

I have done a lot of reading on the Mototron 60's. I cannot come up with definite numbers to use in the tune for them though. I received the injectors "flow matched" from Racetronix with no flow information

So here is what I have;

Offset vs Volts vs VAC: Left stock


Flow Rate vs KPA: From the Spread Sheet, 60lb @ 43.5, 58lb in my rails not boost referenced


Flow Rate Modifier vs Volts: Left Stock


Short Pulse Limit: 3.997


Short Pulse Adder: From my tune with 42lb injectors


Min Injector Pulse


Default Injector Pulse



I’ve also attached my tune. Any input is appreciated.

[vortech]

Hey Mike, this is eb02z06 off the CF forum. When I had 60's on the stock bottom all I did was plug in the injectors with a 60 lb swing-meaning starting in the 60's at 0 and going up. All the offset tables etc stayed stock 02 Z06-car had decent fuel economy and idled and cruised at 14.7.

[Mike04]

Hey Mike, this is eb02z06 off the CF forum. When I had 60's on the stock bottom all I did was plug in the injectors with a 60 lb swing-meaning starting in the 60's at 0 and going up. All the offset tables etc stayed stock 02 Z06-car had decent fuel economy and idled and cruised at 14.7.

I guess nobody has come up with a good set of numbers for the 60's still. There is a lot of post talking about them though....

[jmoody66]

I guess nobody has come up with a good set of numbers for the 60's still. There is a lot of post talking about them though....

Heres a copy of my tune, you can use what I have since Im running those same injectors. My fuel mileage sucks...like 23hwy never hot rodding and 10 to 12 city..some aggressive driving. I dont know if mine are set up incorrectly causing this mileage issue but they do idle nice and it runs well.
Hope this helps.

[Mike04]

Thanks, that gives me something to look at

[RWTD]

Those injectors flow more than 60# at 3-bar (43.5psi). You have your IFR table too low. It needs to start around the 73 range.

See my post here:

http://www.hptuners.com/forum/showpo...&postcount=120

Regards,

James

[Mike04]

Those injectors flow more than 60# at 3-bar (43.5psi). You have your IFR table too low. It needs to start around the 73 range.

See my post here:

http://www.hptuners.com/forum/showpo...&postcount=120

Regards,

James

I used 60 as the flow rate. I see that many use close to 63 when figuring the flow though. I haven't installed the injectors yet, I'll go with the 62.7 value when I do.

[RWTD]

I used 60 as the flow rate. I see that many use close to 63 when figuring the flow though. I haven't installed the injectors yet, I'll go with the 62.7 value when I do.

This is why:

http://www.racetronix.com/L107FM.html

[mterveen]

This is why:

http://www.racetronix.com/L107FM.html

2 questions:

1) at one point i could have sworn i saw that the siemens 60# FM injectors were at 62.7 lb/hr at 43.5. now that link shows 60.56 lb/hr. help, i'm confused now.

edit: found it. each 60# injector on the racetronix website has a different rating, 60.56, 63.20 and 62.70. i ASSUME my flow matched ones from Lonnies for my LS1 are the 60.56?!?

2) my 60# injectors are more than enough for what i need on my car. with my afpr would it make sense to turn the base pressure down from 58psi to say 50 or even 43.5 so the Min PW would be alot lower which would aid in tuning idle and give more resolution? bad idea?

[BLOWNZO6]

2 questions:

2) my 60# injectors are more than enough for what i need on my car. with my afpr would it make sense to turn the base pressure down from 58psi to say 50 or even 43.5 so the Min PW would be alot lower which would aid in tuning idle and give more resolution? bad idea?

I personally would not worry about it, at 58 psi I have never had any issues with them idling funny or anything, and not sure how you would get more resolution with the pressure lower. It is all relative.

[mterveen]

I personally would not worry about it, at 58 psi I have never had any issues with them idling funny or anything, and not sure how you would get more resolution with the pressure lower. It is all relative.

ok thanks. i was thinking with the lower pressure you would be able to more easily meet the min PW demands at idle if needed, e.g. if the injector flows "X" lbs/hr at 58psi at a min PW of 1ms, then it would flow the same "X" lbs/hr at 43.5 psi at a PW of 1.4 ms (only an example). that way you wouldn't bump into the lower PW constraints of the large injectors.

[BLOWNZO6]

ok thanks. i was thinking with the lower pressure you would be able to more easily meet the min PW demands at idle if needed, e.g. if the injector flows "X" lbs/hr at 58psi at a min PW of 1ms, then it would flow the same "X" lbs/hr at 43.5 psi at a PW of 1.4 ms (only an example). that way you wouldn't bump into the lower PW constraints of the large injectors.

You should not have any issues making these idle right.
The only issues I have ever run into were on decel and some part throttle stuff on the MAF cars, these number provided in the other thread about these injectors have really worked out well on this car.

This one is a 427 though, so it will be interesting to see how it works out on a stock cube motor.

[mterveen]

You should not have any issues making these idle right.
The only issues I have ever run into were on decel and some part throttle stuff on the MAF cars, these number provided in the other thread about these injectors have really worked out well on this car.

This one is a 427 though, so it will be interesting to see how it works out on a stock cube motor.

sounds good. car is in storage for the winter so unfortunately won't have any time soon to test. also will be doing the e85 switch so i'll need extra fuel anyway.