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Megasquirt or T5?

8.4K views 39 replies 19 participants last post by  saabmatt  
#1 ·
I have a megasquirt box, PaulH's adapter, and all of the components needed to megasquirt my SPG.

I'm also parting out my 97 NG900 and having it towed away, but I'm pulling the T5 bits off along with a bunch of other stuff.



I just need to weld up an exhaust, and then figure out a tuning solution for my SPG and it will be back on the road! (Just got the interior put back together last night).


So, do I go megasquirt for fuel only, and work out the EDIS system later, and rely on the APC for boost?

Or do I go T5 and tune Fuel, Timing, and Boost from the start?



Other mods on the SPG include:
2.1L head
2.1L intake manifold
85 turbo exhaust cam
9000 non-turbo intake cam
Boostfactory tubular manifol
T3/T4 hybrid turbo
Massive FMIC

And I have both the stock T5 NG900 injectors OR my Stage5 50# injectors to use whichever tuning method I go with.




Megasquirt, I can be running with fuel only pretty much immediately...

T5 I have to get a wheel for the CPS... and I need a canbus and various items to be able to tune it, but I can then have fuel/timing/boost all from the start.


With my T3/T4 monster turbo, I'm concerned about being able to control my boost. So I'm leaning towards T5...



What say you all?
 
#3 · (Edited)
i think its the ONLY thing thats happened to physically tuning the ECUs in forever!

T5 best MS all day on these cars, easier install, ignition and boost control already built in, awesome parts availability, it cant be beat!

nevermind that once alll that hardware stuff is sorted, the car will run as soon as it gets fed power, there is no software headaches to go with it!

its also nice to throw away the dizzy, it makes intecooler pipeing and bigger turbos alot nicer to work with
 
#9 ·
Anyone yet try T5-ing WITH AC in place?

Virginia summers are brutal -- 95+ degrees with 95+ humidity. I will NOT go without my climate control.

Once someone figures out that, I may consider it if the Commem or SE ever craps the shitter ECU-wise.
 
#10 ·
Anyone yet try T5-ing WITH AC in place?

Virginia summers are brutal -- 95+ degrees with 95+ humidity. I will NOT go without my climate control.

Once someone figures out that, I may consider it if the Commem or SE ever craps the shitter ECU-wise.
Not yet, but soon. This is the trick:

Image


:wink:

Paul
 
#14 ·
I like the T-5. There are already about 17 fueling tables that have been validated for lots of driving conditions. They also connect to knock sensor stuff. T5 is set up to let one limit boost on lower gears. So a lot of programming has already been done for 2 or 2.3 engines.
 
#17 ·
Pretty cheap, about $100, well worth it if you ask me. Yes, this is from Keith's drawing, I posted a copy of the CAD file over on ecuproject a while back. The machinist seemed to think that it was balanced perfectly by that extra little bit there, solidworks is a really neat tool for stuff like this.

As for trans durability, hopefully it will break the shit out of it, cause the last 20k of hard driving hasn't done it. 2nd gear syncro is about shot, but it has been since this trans went in, need to get some time to yank the trans and fix that, and install my Gripper diff and a whole bunch of other stuff.

Paul
 
#22 ·
It shouldn't matter. But I'd like to see that verified in practice. MS is and T5 is allegedly only reading of the flanges/edges (donno the correct word in English) . So as long as the edges have a consistent distance it should work. It makes the time on a CNC machine shorter, therefore cheaper to make.
I still like to know how much this creation was costing.
 
#24 ·
T5 reads a sine wave signal from a VR sensor which operates on magnetic principles. The gaps need to be consistant. There is a thread showing a scope plot of the output somewhere.

Unsure on Megasquirts I/O configuration.

It would be cool if the machine shop that did that work could set up a service of sorts. Surface and machine a flywheel with a core charge.

Is there also a template showing the sensor placement on the backplate?
 
#26 ·
Wow, this is all motivation for me.

Took measurements from my '90-'93 9K wheel. Just gotta draw it out and cut it out.

Looks like fun!
 
#31 ·
yes, 90+ c900 turbo, pretty certain the 9k ones are quite different, the backside is what matters here, as some have different contours. I only have a drawing of this on a 90+ turbo flywheel, and I'm not gonna hassle with drawing it on a different flywheel, cause I don't have the software or the skills to do it :lol:

Paul
 
#32 ·
Heh, yeah I still have to draw mine up in CAD. Then I'm gonna need to find a place to cut it out.
 
#33 ·
i'm thinking the plan is to post a "for sale" thread to have these made for people, but only after we get a car running with one, just to make sure they work.

correct, paul?