Lightning Struck

I'm just wondering whats the largest injector I can run and still beable to tone down the pulse width enough for street driving..I'm looking to have enough injector for about 700-800HP(hehe fun plans in the future!)...I plan to run a good sized turbo, and wondering if Mass Air is in my future or not, I'd really like to keep it S/D if I could..I know it'll be a ton of work, but I'm up to it if I can do it..

Thanks, Ray

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Curt
'93 Red Lightning #4232
http://www.geocities.com/lightning_struck93/index.html

Raymond_B

Hi Curt, it's really not a limitation of the computer, although I think a 50lb injector is the largest high impedance injector out there. When you go larger you'll have to go low impedance which will require a modification to your PCM to drive them.

Anyway back to the question, the computer can pulse a big injector really low (my 42's were around .7-.9 ms and idled very good)) the problem arises that really big injectors don't flow that well at the low pulsewidths. You can overcome a lot of that with fuel pressure and tuning though.

As far as S/D, I really think it's possible and I'll have more info when I get my truck going. Although I won't be at those power levels I should get a lot more information. The good thing about a Tuner is that it will work on S/D or MAF computers.

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Thanks,
Raymond
Performance Specialties
01 Cobra
95 Lightning (lots O' mods faster than the Cobra)

Lightning Struck

I've got another question for you Raymond..The A9M is a 5.0 auto mass air computer, are the pin locations for engine, and transmission things the same?? Also what would happen if you were to say, transpose the transmission tables from say a CUP2 computer onto the A9M, would you basically have a A9M Lightning computer?? Both processors seems to be readily supported however I don't know if all the tranny locations in either of them are known, but would something like that work? If I can make the S/D work great, if not, I'll have to figure something out for Mass Air...hmmm...Thundr_Lightning might be getting another email!!

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Curt
'93 Red Lightning #4232
http://www.geocities.com/lightning_struck93/index.html

[This message has been edited by Lightning Struck (edited 09-24-2001).]

FMOS Racing

Curt,

I'm having a great deal of success going the other way - I have a VEX1 E4OD mass air truck computer that I've put the A9L timing curves and mass air transfer functions into. I'm really pleased with the way it's running!



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Later!
Jeff S.
Red Lightning #74 in '95 - 11.92@115.2-lotsa mods
White Lightning #582 in '00 - 13.36@101.75- Swanson chip
Blue 1993 Probe GT - 15.36@89.7 stock daily driver
1973 Datsun 240Z - project car
Drive 'em like ya stole 'em!

Lightning Struck

Great minds think alike, just sometimes in reverse I was hoping the A9M might work that way just because they are basically a dime a dozen.. What vehicles in the VEX1 computer come in??

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Curt
'93 Red Lightning #4232
http://www.geocities.com/lightning_struck93/index.html

Raymond_B

Curt, even if you got past the drastic differences in pinouts and sensors there's no way to re-program the PCM. Meaning that we can't change the instruction sets that are executed. What we can change with the Tuner is the data that is referenced.

The VEX1 is a good candidate as it's pinouts are very close to a Lightning and it is setup to control an E4OD. It came in a 95 F-150 302/E4OD pickup I believe. I think Kevin has the part number.

Ya know what I've been thinking about ? How about a Gen2 EEC-V processor I haven't really studied the pinouts other than you'd have to re-wire a 104 pin connector from your existing 60 pin, but it'd be cool. Hmmm there even might be a way to do the PATS. Anyway that's just a thought

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Thanks,
Raymond
Performance Specialties
01 Cobra
95 Lightning (lots O' mods faster than the Cobra)

[This message has been edited by Raymond_B (edited 09-25-2001).]

Thundrn_Lightning

VEX1 PCM part number: F5TF-12A650-HB. The parts counter may tell you F5TZ, but it's the same thing. The HB suffix is the most important part. It is indeed out of a '95 F-150 302 with an E4OD.

Have fun!



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- Kevin
Black '94 #907

Lightning Struck

Ok guys...So if I went and rumaged through the yards for a 95 F-150 and did get a computer, what would I do as far as a harness?? Is the VEX1 a batch fire, or SEFI computer?? I would like to go to sequential if I could, as the response seems better(makes sense). Then I'd need Jeff to send me over that bin file and we be rockin!

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Curt
'93 Red Lightning #4232
http://www.geocities.com/lightning_struck93/index.html

FMOS Racing

It's sequential so you'll also need the engine harness and the mass air harness from the donor vehicle. Then you'll have to play "Change the Pins" with the EEC connector.

Lightning Struck

I'm almost afraid to ask what ford wants for one..I'd probably be best off looking for one on Ebay or in the junk yard...It's an F-150, it can't be that hard to find..Were all the 351's S/D even in 95,96,97?

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Curt
'93 Red Lightning #4232
http://www.geocities.com/lightning_struck93/index.html

Thundrn_Lightning

Curt,

Two options.

1) Simply re-pin your existing harness and add the wiring for sequential injector firing and MAF. It's not as hard as you think.

2) Get a male and female 60-pin end and make a jumper harness that goes between the truck's underhood 60-pin end and the PCM. Use that jumper to effectively re-pin the truck's harness to the new VEX1 PCM. From that jumper harness you can sprout the sequential injector wires/plugs, and also the MAF plug. As far as what to do for the injector harness, all you'd need to do is unplug the factory injector plugs and plug in the new injector plugs. This system would not touch a single wire under the hood of your truck and you cuold remove it to go back to stock in a very short time.....would never know you've been tampering under there. This is the route I have taken.

However, I do have another Lightning harness that I intend to re-pin as a VEX1 setup and make it look "factory". If you're interested in doing either, shoot me an email and I'd be glad to spill the beans...

Later,

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- Kevin
Black '94 #907

Thundrn_Lightning

BTW, you're right, don't ask what Ford wants for a Lightning harness set. It's about half of the national debt. Junkyards typically have standard F-150 speed density harnesses for $100-$150 around here. Mass air harnesses and VEX1 PCMs are hen's teeth in junkyards.

Lightnings do have specific harnesses both for the underhood and on the engine. They are harder to find than mass air F-150 harnesses.

Later,

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- Kevin
Black '94 #907