[Tigers] Tiger eplacement carb and alternator Questions

Sat Jul 17 17:32:59 MDT 2021

Seems to me I saw an article about the different EFI assemblies and kits – if only I could find it.

I did find this – multiple articles on the subject

Hope it helps

https://www.motortrend.com/s/efi/

Ron Fraser

From: Tigers <tigers-bounces at autox.team.net> On Behalf Of Gary via Tigers
Sent: Saturday, July 17, 2021 3:08 PM
To: tigers at autox.team.net
Subject: Re: [Tigers] Tiger eplacement carb and alternator Questions

Hi Mayf,
 Lookup Speeduino.   Arduino Mega  can do it.
 I was working on that for a GM 2bbl TBI a few years ago.. and got distracted.
 I may be able to get re-invigorated if someone else is working on it...
Gary

On 7/17/2021 11:58 AM, Larry Mayfield via Tigers wrote:

Theo, interesting points you make. And I have not heard  Megasquirt is a long while! Why not consider a Raspberry Pi 3 B+ ? Certainly enough brainpower. An arduino might  work also and it could handle it as well. While I was thinking of a carb setup type of FI, a SEFI might be just as good if implemented correctly. Or even a large throttle bore with direct injection. Think I will look around and see if anyone has made a DIY EFI system using any of this stuff. 

Thanks for reminding me… 

Mayf

TWFS

From: Theo Smit  <mailto:tsmit at shaw.ca> <tsmit at shaw.ca> 
Sent: Friday, July 16, 2021 7:28 PM
To: Will Seay  <mailto:Tigers at embarqmail.com> <Tigers at embarqmail.com>
Cc: Larry Mayfield  <mailto:drmayf at mayfco.com> <drmayf at mayfco.com>; tigers  <mailto:TIGERS at autox.team.net> <TIGERS at autox.team.net>
Subject: Re: [Tigers] Tiger eplacement carb and alternator Questions

Will and Mayf,

I ran my Tiger with a BossEFI 4-barrel throttle body injection system for about six or seven years. This is the system that got acquired (or at least rebranded and marketed) by Professional Products.

The version I had, still had the ECU separately mounted in the passenger compartment; later versions had the electronics all integrated in the throttle body assembly. This simplifies the wiring but subjects the electronics to the under-hood heat, which is maybe not a great idea.

When I bought my crate motor, it came with a carb and so far I have not put the BossEFI back on yet. The programming interface for the BossEFI system was ... not great. It came with a number of pre-built maps, but it was not easy to tweak in a logical way, and especially its integration of air/fuel ratio feedback and timing control was just weird. The car ran fine at WOT but the part throttle operation was not easy to get right. This is partially because the Tiger will run all day at really small throttle openings, and so you're always tuning just a hair off the idle settings. I'm not sure if a throttle body that had the injectors below the throttle plates would be better in that regard.

If / when I get time to go back to playing with that setup again, I may look at using a third party EFI controller (such as Megasquirt, if they are still making stuff that can be adapted to any generic injector), rather than going back to 2003 era user interface and controls.

To set the car up for the EFI system, I took many of the same steps that Will did. I plumbed a 3/8 inch feed and return line from the back of the car to the firewall and mounted a regulator on the firewall. I initially used a high volume canister filter as a sort of surge can, but currently I have the (stock) feed from the tank running about 12 inches forward, to a low pressure pre-filter. Then the return line is teed in, and we go to the fuel pump and then the high-pressure post filter. Those three pieces are all mounted under the trunk, behind the Alpine spare tire well.

I'm running a Denso 70 amp alternator that is small enough to tuck ahead of the right cylinder head, still preserving the stock fan belt line. I also have a Plex wideband O2 sensor mounted in the right header collector.

To convert back to the carburetor, I just swapped the 45 PSI regulator out for one that would not flood the Holley carb's needle/seat. The (high pressure) fuel pump just ends up circulating the fuel through the return line, if there is any excess volume.

Cheers,

Theo

  _____  

From: "tigers" <tigers at autox.team.net <mailto:tigers at autox.team.net> >
To: "Larry Mayfield" <drmayf at mayfco.com <mailto:drmayf at mayfco.com> >
Cc: "tigers" <TIGERS at autox.team.net <mailto:TIGERS at autox.team.net> >
Sent: Friday, July 16, 2021 3:38:16 PM
Subject: Re: [Tigers] Tiger eplacement carb and alternator Questions

Mayf,

I got the EFI bug some time ago when I saw a series of Hagerty Youtube videos in which a Fairlane (5-bolt) 289 was rebuilt to a 289 HiPO-ish state and then put it in Brad Phillips Tiger.  The plan was to do the engine swap and get the engine going with a Holley 4BBL setup and then switch the 4BBL for a Holley Sniper EFI throttle-body unit.  Brad got his Tiger going with the 4BBL setup but, to my knowledge, never did the Sniper install.  Brad's engine swap was recorded in a series of 12 Youtube videos.  Here are some links:

Here's the first episode of Brad Phillips 289 engine swap:  https://www.youtube.com/watch?v=CzWYRPH24Bw <https://www.youtube.com/watch?v=CzWYRPH24Bw&list=WL&index=2&t=26s> &list=WL&index=2&t=26s

Here's the Hagerty time-lapse video of the engine rebuild:  https://www.youtube.com/watch?v=tVtrnxx3rTE <https://www.youtube.com/watch?v=tVtrnxx3rTE&t=0s> &t=0s

There is a Youtube video of a dyno test of the engine with and without EFI.  So far I haven't found a link to it.

I have been making plans to make my car "EFI-ready".  That is, I want to have a plan for each aspect of the conversion.  Current plan is to replace the OEM fuel pump with the high pressure pump and to house pump and pre and post filters in the same area as previously housed the OEM pump.  I have made up a heat shield for the right-side muffler to keep from roasting the pump.  Fuel return line will go into the top of the right fuel tank.  I can provide pictures of the return line fittings if you are interested.  I will be doing my own harness.  The Holley harness is bass ackwards for a Tiger, assuming battery up front.  Fuel relay and fuses for fuel pump and EFI will be located with the pump.  Anticipating that the fuel pump and injectors will want to suck more current than the OEM generator can provide, I have done an alternator conversion.  I already have a wide band O2 sensor installed for a PLX O2 readout so the O2 sensor is already there.  Control of distributor advance is optional with the Sniper so I don't plan to do opt for that initially.  Someday I would like to add it though.  Should improve driveability and maybe performance.

Like I said, I want to make the car "EFI-ready" .  Don't know if I will actually do the conversion, but I want to at least have it thought out so that I can get there from here if I decide to.

Will - 382001570 
Tigers at embarqmail.com <mailto:Tigers at embarqmail.com> 

On Fri, Jul 16, 2021 at 9:46 AM Larry Mayfield via Tigers <tigers at autox.team.net <mailto:tigers at autox.team.net> > wrote:

I have  owned my Tiger since Jan 1967, bought it used.  Has been sitting quietly now for quite a number of years. And I want to drive it a bit more now. But carbs are so old fashioned, lol. So, seeking information from the groups experiences, those owners who have replaced the carb with an electronic injected version: either 2 bbl or f bbl versions. If 2 bbl then I would just use the cast iron intake manifold. If 4 bbl I need to know which is best for a bone stock 260 cid which so far in my ownership  has never been apart.  I tend to lean toward a 4 bbl version as I have a 5 bolt 289 with some performance capability and I would need to buy a manifold for that.  I also have my 260 LSR motor which has the full treatment and is a real race motor.   So, seeking real world experience on what and which brands are most user friendly while putting out power for driving around, having some fun (again).   

Larry, mayf, drmayf etc

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