Fuel injection tr 7- 2.0

[mb4tim]

What about the large-diameter air hose that connects the air cleaner to the throttle body, then to the plenum. - is it in good shape? Mine was rough, duct taped, had a soup can in it (no lie, I found this once I started investigating), wouldn't hold a steady idle. Replaced it, and all was well.

-Tim
http://www.morSpeedPerformance.com

[caferc]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by HDRider</i>

Edward Hamer
Petaluma CA
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The 02 sensor is brand new, the hose to the throttle control as well as the hose to the AFM is from a volvo/ saab donors they are thick rubber and I

[caferc]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by caferc</i>

Any know if there is another ECU( computer ) that can be used in the TR7
thx
CAferc
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big air hoses to and from AFM and throttle control were from Saab/ volvo ; thick rubber, tested using compress water. 02 sensor brand new with 200 miles on it

thank guys for your input

[mb4tim]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by HDRider</i>
Oxygen sensors are all one standard size by the way.
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Jaguar and Rover use 17mm O2 sensors. I'm sure there's more:(

-Tim
http://www.morSpeedPerformance.com

[Vino79TR7]

CAferc:

"Legally"...you can't use a different ECU in California

"...[is] there is another ECU( computer ) that can be used in the TR7..."...YES...are there better ECUs? MANY! MANY! MANY!...you'll need to break down the ECU connection to what each wire does...to use a different ECU.

Its complicated and requires some research but a "multi-port fuel" system on the TR7s 2 liter engine...could get 35+ MPG...or close to double what you're getting now...since you'd be injecting fuel to half your cylinders half the time...with a multi-port system.

Here's another interesting company:
http://www.extrudabody.com/servlet/the- ... win/Detail

since you already have a factory FI system...you'll won't need the IFBs...but if you used a Sprint intake manifold with dual Weber bolt pattern...you could use the 4 IFBs...and that would look very cool.

Good luck

-V

PS...as far as the SMOG inspection in California goes...they don't check if the ECU is original or not...if your worried make an "officially" looking sticker on your computer and stick on an obvious place on the ECU...that should be good enough.

[FI Spyder]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Vino79TR7</i>


Its complicated and requires some research but a "multi-port fuel" system on the TR7s 2 liter engine...could get 35+ MPG...or close to double what you're getting now...since you'd be injecting fuel to half your cylinders half the time...with a multi-port system.
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Not sure what you mean by this as they only fire once per compression stroke (albeit at the same time thereby some charges sitting at the intake valve for a split second), I've gotten as high as just over 40 mpg imperial so that means I could get over 80 mpg? That would be very impressive indeed. Who needs a hybrid?



- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT

[Vino79TR7]

FI Spyder:
It’s not surprising you wouldn’t understand…you need to know what a multiport fuel injection system is.

If it’s your claim the original Bosch system FI system on a TR7 or eight is equal to or better to a modern multiport FI system…

What can I say? You’re entitled to your opinion.

Facts are facts…the original Bosch systems on the TR7 and the TR8 were designed to lower emissions…not for power or fuel mileage.

your car gets 80 mpg...wow that's amazing...you're a lucky driver.

-Vino
79TR7
Driven daily

[HDRider]

Even with a multi port injection system you still wind up with injectors fueling into "still" air as the time duration of the injection cycle is longer that the open phase of the valve movement at high rpm/fuel need conditions.

Realistically the air in the manifold is never "still" at speed. The real advantage of multiport is a much better idle. There is still only one Oxygen sensor per cylinder bank so there is no advantage in mixture control.

Edward Hamer

[Vino79TR7]

Caferc:

I’m sorry I answered your question incorrectly.

The answer to your question: there is no other ECU (computer) from another car that could “direct replaceâ€￾ or plug into the harness of your TR7.

Using an ECU from a different car (of which there are many) “in theoryâ€￾ would be possible but would require a great deal of research. I say, “In theoryâ€￾ because I have never done it personally…or know anyone who has.

The point I wished to make, was that if you need a new ECU for your seven… build an entire fuel injection system, with a modern ECU (“modernâ€￾ in comparison to the original ECU) that is better than the original.

Better meaning: more reliable, increased power, and increased fuel economy. Where support for the new ECU system is available.

-Vino
79TR7

P.s.
In my haste…I’m afraid I got ahead of myself, and got off track…the Extruda Body reference, shows a setup with 2-IFBs. A 4-IFB system would look much better in my view. Using a Sprint intake manifold its possible.

[Vino79TR7]

Edward:

If it’s your belief the sevens or eights Boshc - banked fuel system, designed 30+ years ago is more efficient or better or even equal to a modern sequential multiport systems…what can I say? You’re welcome to that view.

I'm beginning to think I am in the minority...

-Vino
79TR7

[Workshop Help]

Our friend Vino is correct as to the reason for fuel injection in the last TR7's. While the stated power did come up one horsepower, the big increase in fuel economy came from altering the differential ratio from 3.90:1 to 3.45:1 along with changing the fifth gear ratio. The EPA tests were also conducted in the 55MPH era which kept the engine revs and fuel consumption down.

Mildred Hargis

[Hasbeen]

Yep, modern common rail injection systems are pretty good. Some of the power developed is almost foolish.

We fitted the latest low pressure system & the latest Haltech computer to the 4.6L 8 & are happy with it. It don't half go mum.

Jack Brabham won a couple of F1 world championships with the Repco 3.0L F1 engine, based on a Rover/Buick engine, fitted with the same injection system fitted to our 7s.

Hell I even won a few races in the same F1 Brabham Repco he used to win the Aus GP in 66. About the only thing on that engine that gave no trouble, all season, was the injection.

Remarkably, my old 7 is still running very nicely on it's archaic SUs. I wonder how many common rail injection fed cars will be doing that at 35 years old.

Hasbeen

[Stag76]

You can use bits and pieces from just about anything and get a considerable improvement. You have to use the correct plenum capacity, throttle body diameter, injector flow rates etc. for the engine size and state of tune.

I made aluminium injector cups and soldered them into a Sprint manifold using Durafix, made a plenum from exhaust pipe, fuel rail from hydraulic pipe using Ford injector cups and core plugs as end caps, injectors from a Mitsubishi Magna, Bosch IAC valve from a Hyundai Excel, fuel pressure regulator and VR Sensor from a Ford, throttle body from a Nissan, Coils, IAT and CLT Sensors, Fuel pump and filter from a Holden and a MegaSquirt2 DIY ECU kit.

The end result is easier starting (no choke flooding the cylinders and washing down the bores), better running throughout the range, more power and 37mpg in a 60/40 mix of Country/City driving.

Removing the distributor and controlling the wasted spark system via the ECU brought about the biggest single improvement.

I found it easier to get a good tune and maintain it than it was to synchronize and tune 2 SU's.









TR7 Convertible
Sprint Motor
MegaSquirt EFI

[john 215]

Hi,

Great piece of engineering and problem solving, I assume you are using a M.A.P. sensor rather than air flow meter ?

How things have moved on -





Cheers John



LIVE LIFE A QUARTER OF A MILE AT A TIME!

1976 Speke FHC Beauty Now with an overdrive conversion

1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!

[FI Spyder]

OK some clarification here. A Multiport fuel injection is one injector per cylinder firing near the intake valve (which the TR7 Bosch is). A throttle body fuel injection has (typically)one or two injectors firing in a common body with the charge then going to the different cylinders through intake ports (GM used this a while back for example). Modern day engines now use direct injection where the charge is fired directly into the combustion chamber at much higher pressure to maximize power and mileage. The TR7 Bosch being the first electronic (analog) FI was to be a reliable (as opposed to mechanical [:p])system to meet the toughest emission on the planet (California) with the other states to follow later. It didn't increase hp or mileage except it could keep the engine at optimum longer/better than carbs could without tinkering. The two different ECU's that the TR7 used were not interchangeable (I think Zeke tried that). The TR8 ECU was Lucas. It did increase the hp from 135 to 150. A Rover electrical engineer thought that a Range Rover (or what ever model it was) could be used if one of the lands were cut. I don't know if the TR8 community (in another forum) got around to trying it. The Rover ECU was $400 and cheaper than a repaired TR8 one.

You can jury rig a FI system as Stag76 showed but rather than go to all that trouble (in North America as the Sprint engine never made it here) I would buy an old American running car that used the FI Buick V6 so as to have all the parts and adapt that. Cheaper, more power, most of the work is done, $600 adaption kit from John's Cars.


- - -TR7 Spider - - - 1978 Spitfire- - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT