B3T aspire

[bhearts]

I wanted to get my intake manifold built first. Here's what I have so far

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[bobbyspider]

daaayyyyyywwwmmmm

[bhearts]

Those velocity stacks really are a thing of beauty. Specialty design it has the 3 degree reduction from the bottom of the radius to where the runners mate up, that's supposed to maximize the port velocity.

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[Spike]

It doesn't matter how much horsepower your car has. The speed limit is only 55 on state Highways. lol

A little late for me to comment. Try I-465/70 East around Indianapolis. 55MPH posted, some places 50..

..average speed: 72-80, with 3-5 lanes (I stay at 78 because the Sprint gets the shakes at 79 haha). And I still have people passing me, including police cars. Usually AT LEAST 90-95 gets you a ticket lol.. Nothing like going 30 miles over the limit and being passed.

-Joe

[bhearts]

I'm having a 9b turbo donated to me that'll more than likely need rebuilt, how reliable are rebuild kits. Would I be better off buying a 150 dollar eBay turbo

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[bhearts]

so im a bit of a perfectionist. everyone seems to get along fine with a fmu on the stock injectors and fuel rail and regulator. ive been contemplating and about ready to pull the trigger on a secondary set of fuel injectors. i plan to put them piggy back on the stock injectors, but theyll only recieve signal once boost comes on. these will recieve an adjustable fpr for fine tuning, and the fmu that i planned to put on the stock rail and injectors. i plan to have all my fuel enrichment come from these injectors which i plan to spray e85 through, i was also thinking about ethanol mixed with race gas. i like this idea more than progressive water/meth injection because it adds the 3d effect of pulsed direct cylinder control that water nozzles cannot provide. so id have the increasing fuel pressure and the ever increasing injector duty cycle that is tuned with engine rpm. i cant be the only person that thinks its perfectly possible to rig up a way to run 15 psi boost on a stock ecu.

[sketchman]

There are aftermarket units like that. Not for the B3 though. Called a portfueler IIRC. Does just what you want but strictly with another standalone "ECU" just for those injectors if I understand it correctly. Might look into that before your DIY idea gets too far along to see how bad it would be to adapt one to the B3 and cost. Just a thought.

[bhearts]

a standalone fuel controller...thats ingenious. the big reason ive never installed my ms3 on my aspire is that i cant have downtime with that car, because its my dd. but this mr sketchman, this you have put an idea in my mind. why not use the megasquirt to drive the extra injectors, like two piggyback ecus. this is probably the best most workable idea ive heard all day. whats the worst that could happen with something like this. i could start with the boost super low, ie 2lbs, and slowly crank it up and tune the megasquirt everytime im brave enough. i should be able to use most of the engines stock electronics to interface the ms. since most everything puts out signal, and hooking another read line onto certain things like the tps or cas shouldnt have a problem with the stock computer. so i can keep driving and keep tuning. especially on e85. how cool would it be to be able to shut the stock injector signal off, and have the tune fully on megasquirt for super fuel racing. do you see where im going here. then turn race fuel back off and just let the stock ecu do its thing for road trips or cruising.

[eurotiva]

Look up a hobb switch. We used to put a single injector on one activated @ 10 lbs. caveman style....

[Rocketman]

Caveman style is crude, I've done it before. Did not work out in the end.

I have run two simultaneous ECU's before, and actually hot-switched back and forth between them. (running a b6t) stock B6T + an MS2
I used the MS2 for datalogging on the stock ECU, and had the injector lines wired to a DPDT switch so I could switch which ECU actually had fuel control.

I'm not a fan of extra injector systems, or anything mechanically controlled anymore, as tuning is just too coarse on it. (IMO, let's make that clear)
With the availability, cost, and tunability of aftermarket systems today it's kind of silly to not go that way unless you cannot modify the stock stuff(emissions, class etc)

[bhearts]

I figure I'll add my ms3 in piggy back on extra injectors for now, obviously once my intake manifold is complete. Then slowly I might incorporate it as my only fuel control. Would you guys trust epoxy fir holding in fuel injector bungs? And do you have a preferred or optimal angle of installation. I could get them welded in I suppose, but alot of places that sold injector bungs said epoxy was fine

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[bhearts]

It's a bit confusing of an idea to switch injectors in and out based on boost level. My idea was to have two separate hobbs switches for each bank of injectors. Since my under boost injectors are going to be located in the upper manifold, I figured id set the hobbs to turn them on around 1.5psi. And another hobbs switch to turn off the normal injectors at 2psi or so. Most hobbs switches are adjustable so I could tune their overlap manually to not have any dead spots in fuel flow. But my indecision is about using a relay for switching or a fet. I think fets would provide more reliable quick switching, so I'll probably go this route. Unless someone can talk me out of it

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[bhearts]

Rocketman, did you end up switching injectors with your switch, or just switching ecus

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[Rocketman]

I ran one bank of stock injectors, and I could switch which ECU was controlling them with the switch I installed. I could do this on the fly, without interrupting engine operation. Both ECU's were running, and outputting to the injectors, but my switch only allowed one ECU to control them at a time.

Running the extra injectors from the ECU's main injector signals, and using a relay or FET to turn them on, is going to create a massive influx of fuel once your hobb switch activates. You really need to control the pulsewidth of the extra injectors, regardless of fuel pressure, so that you don't end up with this. They make controllers for this, but the expense would exceed a good MS unit without the options of a true standalone system.

[bhearts]

i wont just be turning on extra injectors. ill be turning off the factory ones at the same time. my secondary injectors will be e85. which i figured would be great for on boost.