Need help SMT-6 for 5sfte - Page 2

PETC · 01-09-2009, 10:21 PM

It doesn't "Damage the ecu" it could blow up your motor. It is just a very stupid way to manage a fuel system, it is not controlling variables that NEED to be properly, accurately, and precisely controlled for an engine to run well and reliably. All a piggyback is doing is taking information, changing it, and sending it to the ECU, sometimes it tries to extrapolate and do things that full engine management solutions do by changing variables in the ECU that when changed together produce an effect similar to the one managed explicitly by a standalone computer. It's all guesswork and it can lead to your engine blowing up.

They're a CHEAP way to do things for people that can't justify spending more money.

It's all around a bad idea, the article I posted has more information from someone who has more experience than I do with EFI systems.

Once again this phrase has meaning:

Fast, Reliable, Cheap

Pick two

fvillota · 01-09-2009, 10:24 PM

cool cool thanks for the head up. i guess this totally gets my head out of the piggy backs. umm whats about this? ATS Tuned Rom

PETC · 01-09-2009, 10:28 PM

A professional ROM tune IS an acceptable alternative to a standalone ECU, but usually it will be a ROM tune for a recomended mod-set. Any modifying you do to the engine all the way from a cold-air-intake to an entire head swap changes how it operates, and thus changes the way the ECU operates. You must remember that when you slap new injectors into your motor, the computer doesn't go: "Oh, look, new injectors" all it sees is different resistances than its used to seeing and it compensates for that.

That works alright for a lot of different kinds of mods, but once you start getting into extensive engine and fuel system modification it is a good idea to go with a standalone and have the car tuned professionally by a certified EFI tuner on a dyno.

YELLOW_MR2 · 01-09-2009, 11:19 PM

So PETC, How about running a Greddy E-Manage piggy back on the 5s??
(bad) (good)??

PETC · 01-09-2009, 11:33 PM

ANY sort of piggyback system is a band-aid and IMO crap. Doesn't mean it won't work. These things DO work, but they're crap.

Read the article I posted a while back, it specifically mentions the G'reddy E-Manage in not-so-flattering terms.

YELLOW_MR2 · 01-09-2009, 11:36 PM

Yep i read it..looks like i need a stand alone, because im running the greddy e manage..I really dont know how its going to turn out, i mean my car is running but its winter and theres no way in hell im taking my car out..but thanks i didnt know that

mrturrari · 02-24-2009, 06:25 PM

Piggybacks are fine if you understand what you are doing and take the time to tune it right. An EMS will always give your more predictable, finite control though and for higher powered forced induction I wouldn't use anything else.

This should cover just about anything you want to know about installing an SMT6:
93 5sfe - SMT6 installed and working

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-09-2009, 10:21 PM	#21 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,410 Thanks: 27 Thanked 52 Times in 45 Posts My Google Map iTrader Rating: (4/100% )	It doesn't "Damage the ecu" it could blow up your motor. It is just a very stupid way to manage a fuel system, it is not controlling variables that NEED to be properly, accurately, and precisely controlled for an engine to run well and reliably. All a piggyback is doing is taking information, changing it, and sending it to the ECU, sometimes it tries to extrapolate and do things that full engine management solutions do by changing variables in the ECU that when changed together produce an effect similar to the one managed explicitly by a standalone computer. It's all guesswork and it can lead to your engine blowing up. They're a CHEAP way to do things for people that can't justify spending more money. It's all around a bad idea, the article I posted has more information from someone who has more experience than I do with EFI systems. Once again this phrase has meaning: Fast, Reliable, Cheap Pick two

01-09-2009, 10:24 PM	#22 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,805 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	cool cool thanks for the head up. i guess this totally gets my head out of the piggy backs. umm whats about this? ATS Tuned Rom

01-09-2009, 10:28 PM	#23 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,410 Thanks: 27 Thanked 52 Times in 45 Posts My Google Map iTrader Rating: (4/100% )	A professional ROM tune IS an acceptable alternative to a standalone ECU, but usually it will be a ROM tune for a recomended mod-set. Any modifying you do to the engine all the way from a cold-air-intake to an entire head swap changes how it operates, and thus changes the way the ECU operates. You must remember that when you slap new injectors into your motor, the computer doesn't go: "Oh, look, new injectors" all it sees is different resistances than its used to seeing and it compensates for that. That works alright for a lot of different kinds of mods, but once you start getting into extensive engine and fuel system modification it is a good idea to go with a standalone and have the car tuned professionally by a certified EFI tuner on a dyno.

01-09-2009, 11:19 PM	#24 (permalink)
YELLOW_MR2 5SFTE Powered! Join Date: Nov 2008 Location: Washington St Posts: 1,063 Thanks: 91 Thanked 23 Times in 21 Posts iTrader Rating: (4/100% )	So PETC, How about running a Greddy E-Manage piggy back on the 5s?? (bad) (good)??

01-09-2009, 11:33 PM	#25 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,410 Thanks: 27 Thanked 52 Times in 45 Posts My Google Map iTrader Rating: (4/100% )	ANY sort of piggyback system is a band-aid and IMO crap. Doesn't mean it won't work. These things DO work, but they're crap. Read the article I posted a while back, it specifically mentions the G'reddy E-Manage in not-so-flattering terms.

01-09-2009, 11:36 PM	#26 (permalink)
YELLOW_MR2 5SFTE Powered! Join Date: Nov 2008 Location: Washington St Posts: 1,063 Thanks: 91 Thanked 23 Times in 21 Posts iTrader Rating: (4/100% )	Yep i read it..looks like i need a stand alone, because im running the greddy e manage..I really dont know how its going to turn out, i mean my car is running but its winter and theres no way in hell im taking my car out..but thanks i didnt know that

02-24-2009, 06:25 PM	#27 (permalink)
mrturrari I <3 my 5sfe Join Date: Mar 2005 Location: Salt Lake City, Utah Posts: 510 Thanks: 2 Thanked 125 Times in 82 Posts iTrader Rating: (0/0% )	Piggybacks are fine if you understand what you are doing and take the time to tune it right. An EMS will always give your more predictable, finite control though and for higher powered forced induction I wouldn't use anything else. This should cover just about anything you want to know about installing an SMT6: 93 5sfe - SMT6 installed and working