Sprints running Megasquirt EFI

[paulsprint]

Hi
I'm in the process of installing fuel injection on my sprint, I plan to use a Megasquirt ECU. Is there anyone else on here running this setup, as I really could do with a base map to start with. I already have a ING map as I'm currently running a MegaJolt ING system (very good), just a case of coping it into the MS code.

Thanks Paul

[DavePoth]

Not heard of anyone doing it, but it certainly sounds like a cool project. I'm thinking of putting EFI on my sprint at some point, is there any chance you could do a bit of a write up and take some photos of what you're doing?

[ToledoZombie]

This sounds very interesting as I'm currently getting ready to fit a mega jolt onto mine.

[paulsprint]

I will be taking some photo etc as work progress. It been a bit slow lately due to a new baby. Two under two's and trying to run my own business is taking most of my time. I plan to get it finished by the summer though. The only problem is I can't take the car off the road for any length of time as I plan to compete in the CT autosolo championship as well as the odd track day.

[Stag76]

I'm running a MegaSquirt EFI System on my Sprint engined TR7. I used a Modified Sprint manifold, plenum made from exhaust tubing, Nissan Throttle body, Bosch injectors sourced from a Mitsuishi Magna, Bosch Idle valve from a Hyundai, GM Australian Commodore Coils, Ford VR Sensor, Bosch Oxygen Sensor, GM Coolant Temp Sensor, Ford Air Temp Sensor, Ford Fuel Regulator, Bosch fuel pump.

I'm running the MS2 Extra Code.

I fabricated the fuel rail and 36/1 wheel.

There are some pictures here :-
http://s991.photobucket.com/albums/af32 ... =slideshow

[merlind100]

This is as far as I got

25042009050.jpg (141.64 KiB) Viewed 4844 times

A pair of Rover 25 48mm bodies in place of the carbs with specially made adaptor plates. The plan was to drill the manifild for injectors and fabricate the fuel rail from scratch. Sadly with the car now long gone I'll not finish it but we did have nearly all the parts to. A Range rover fuel pump fitted to the tank would have solved the need for an electric pump and swirl pot all in one go and is much cheaper than buying the Webcon combined unit.

[zombeh]

I've got as far as

using suzuki tl1000R bodies other things have distracted me though.

[paulsprint]

I'm running a MegaSquirt EFI System on my Sprint engined TR7. I used a Modified Sprint manifold, plenum made from exhaust tubing, Nissan Throttle body, Bosch injectors sourced from a Mitsuishi Magna, Bosch Idle valve from a Hyundai, GM Australian Commodore Coils, Ford VR Sensor, Bosch Oxygen Sensor, GM Coolant Temp Sensor, Ford Air Temp Sensor, Ford Fuel Regulator, Bosch fuel pump.

I'm running the MS2 Extra Code.

I fabricated the fuel rail and 36/1 wheel.

There are some pictures here :-
http://s991.photobucket.com/albums/af32 ... =slideshow

Hi, had a look at the pics, very nice loverly and neat. My planed setup is as follows.
STD manifold with injector bosses weld in.
Pico 280cc injectors for a Clio
Modified vectra fuel rail.
Astra Gte pump and pressure reg feed from a swirl pot in boot
1"3/4. 45mm throttle bodies made from a set of su's. Cut down so as to remove the dash pots etc, with 120mm trumpets fed from a STd style airbox, STD throttle linkage
Mega squirt 2 v3 running msextra. For fuel and ING
Ford zetec coil pack ( already install for the megajolt system )
Closed loop wide band o2 censor
Ford zetec PWM idle valve

Engine is lightened & balanced bottom end. Ported head as per ST papers. Double valve springs and titian caps. STR 091 cam. 10.5:1 CR

What spec is your engine and would it be possible to have a copy of your map. I know it will be different but it's a start also it might do for the initial startup.

Thanks

[Stag76]

Hi,

If you use throttle bodies made from SU's, you will have to rig up a TPS somehow. Is the EDIS module incorporated in the megajolt setup? EDIS is still some of the best electronics developed for spark control...if you pull some of the later Ford ECU's apart, you'll find the EDIS chip inside.

I started using two Nissan Throttle bodies inplace of the SU carbies, but found it nearly impossible to tune. With no plenum, the changes in pressure in the manifold were very quick. As soon as you opened the throttle, the pressure rose from 35kpa to 95kpa immediately. This meant that it was possible to tune at any static rpm/manifold vacuum (ie. idle, cruise, WOT) but the transitions and acceleration enrichments were very hard to get correct. I gave up after a while and built the plenum, which solved all the problems.

Are the injectors you have high or low impedance. If they are low impedance, you will have to use a resistor pack or tune them using PWM.

You're welcome to my setup...I'll email it to you. My engine is stock standard Sprint.

If you have a WB O2 sensor, you can download TunerStudio Tuning Software, pay the nominal registration fee to obtain the Live Analyse version, and tune it on the road. There is a default tune downloaded as part of the MS2-Extra software, which, after changing some basic settings, will start and run most engines. From there, it is only a matter of changing settings specific to your setup, and starting the tuning process.

[trackerjack]

This very interesting and the first question is this. How much power does the standard engine make with better control and how is the fuel consumption?

[Jon Tilson]

I fail to see why you need 2 throttle bodies when my XJ6 is quite happy with just the one.

Most other moderns seem to do it the same way.

Jonners

[Oli_88]

The in thing at the moment Jonners is to run 4
Interesting stuff, thanks for posting your setups.

[DavePoth]

I fail to see why you need 2 throttle bodies when my XJ6 is quite happy with just the one.

Most other moderns seem to do it the same way.

Jonners

The main reason to run two is so that the original manifold can be used with minimal adjustment.

Looks like a fair few people doing it then. Any suggestions as to what to do with the "plumbing" (fuel lines, pumps etc.)?

[paulsprint]

the reason for running the two is as Dave says i can use the Std manifold, cost and power/ drivability. the engine will hopefully make around the 180bhp mark which means you need a reasonable sized single throttle which will be less responsive at low revs. so two smaller 45mm one will be better.
The fuel lines are as follows. I have a small pump to pump fuel from the tank into a 1Ltr swirl pot and a astra GTE pump feeds fuel from the swirl pot to the injector fuel rail via an 8mm copper fuel line ran down the tunnel, which is in turn has its pressure regulated to 3bar. The fuel return is also routed via the tunnel back into the swirl pot. The swirl pot has a return pipe T'd into the tank breather. This way no matter how much i throw the car round I will always have a constant supply of fuel.

I have already sorted the TPS out on the side of the su's, how ever i am toying with the idea of running two different throttle body's as the spindles on su's are a bit crude compared to the ball raced and sealed modern units.

I started using two Nissan Throttle bodies inplace of the SU carbies, but found it nearly impossible to tune. With no plenum, the changes in pressure in the manifold were very quick. As soon as you opened the throttle, the pressure rose from 35kpa to 95kpa immediately. This meant that it was possible to tune at any static rpm/manifold vacuum (ie. idle, cruise, WOT) but the transitions and acceleration enrichments were very hard to get correct. I gave up after a while and built the plenum, which solved all the problems.

I was planning on running a TPS system as opposed to a MAP system as the cam has i reasonable amount of overlap. the would get round the problems you had.
On the ING front I the car already has the edis unit installed so I will probably use that controlled by the MS2. Once I have the injection running properly I will ditch the edis and control the coil pack direct from MS2

Pico are high impedance injectors so no probs there

[Stag76]

I agree that a single TB is better for everyday road use than multiple TB's...the extra work involved in building a plenum is well worth it. If you use multiple TB's, you then have to tune using Throttle Position/ RPM, as opposed to the easier method of Manifold Vacuum/RPM. The fuel consumption is good, approx 38 mpg for a 50/50 mix of country and city driving. I haven't really tuned it for economy in the cruise area, but a little tuning in this area should easily achieve 40mpg. The power delivery is smoother than carbies/distributor probably due to the infinite control you have over mixture, dwell and spark advance angle, and the use of coil packs/wasted spark which allows a much stronger spark. It drives more like a modern engine, with no peaks and troughs in the power curve. Mine is a stock standard motor, and performs better than another sprint engined TR7 around here...I don't know by how much, but enough to be easily noticed by an experienced driver with no interest in either car.

I don't feel there's any gain in using the MS to fire the coils in favour of the EDIS unit. Using EDIS keeps the high voltage out of the ECU, with only logic signals to and from the MS. I've got another motor with modified head and cam (at the engine rebuilders) that had similar power output to yours (130RWHP, which equates to roughly 130KW at the flywheel), and I've got an EDIS 4 coil pack and module that I'll use on it. I'm also going to try modifying and adapting an Australian Ford Falcon 6 cylinder manifold to fit.

Edit: I'm replying to several posts here.