modifications to a speed density system
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Joined: Jun 2003
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From: Calhoun GA
Jason,
You can use long tube headers with your set up and a chip will help tie everything together. The only thing that will affect SD is the cam. In that case, a custom grind that is "SD friendly" is the way to go.
Many GEN 1 Lightning owners have opted to keep thier speed density setups and upgrade to long tube headers, aftermarket heads, and nitrous and/or boosted applications, some have also gone with strokers and seem to run well....but they also use software (Tweecer, Tuner or SCT) or a chip to optimize all the parts they install. I run a mass air conversion on my '94 Lightning, but I have seen SD set ups make tons of power, and still have good idle cruise manners...it's all in the cam.
You can use long tube headers with your set up and a chip will help tie everything together. The only thing that will affect SD is the cam. In that case, a custom grind that is "SD friendly" is the way to go.
Many GEN 1 Lightning owners have opted to keep thier speed density setups and upgrade to long tube headers, aftermarket heads, and nitrous and/or boosted applications, some have also gone with strokers and seem to run well....but they also use software (Tweecer, Tuner or SCT) or a chip to optimize all the parts they install. I run a mass air conversion on my '94 Lightning, but I have seen SD set ups make tons of power, and still have good idle cruise manners...it's all in the cam.
Last edited by Blurry94; Dec 27, 2003 at 07:34 PM.
Senior User
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comp cam CAA-31-255-5 is the speed density friendly cam for my 93 5.0. comp cam said it works out to about 20-25 HP at the rear wheels. the biggest problem with the 5.0 on the pre mass air is the cam blows it chokes the hell out of the engine. people try running 1.7 rockers to get more hp cheap, but the duration is nothing so it doesnt get squat for HP.
Senior User
Joined: Dec 2003
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From: Eastern Ohio
Belt PN:
Gates K060832
21mm x 2125mm, as for the HP gains, I would guess in the 15-20hp range without the chip
Also, I figured out what I am going to do with the F250... I stumbled upon a 429 and long tail C6 today for $75.00, so it will be changing over to the 429
Gates K060832
21mm x 2125mm, as for the HP gains, I would guess in the 15-20hp range without the chip
Also, I figured out what I am going to do with the F250... I stumbled upon a 429 and long tail C6 today for $75.00, so it will be changing over to the 429
Post Fiend
Joined: Jan 1997
Posts: 23,165
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From: Enjoying the real world.
Originally posted by b_dub
Sorry I was mistaken, you can reprogram it. PROM does stand for Programable Read Only Memory, and since it can be reprogramed, it has to be an EEPROM (Electronically Erasable PROM).
I find it hard to believe that headers require a reprogram. Before I did the MAF conversion I had cat-back exhaust w/ no problems. But I haven't put headers w/ the stock computer so I can't say for sure.
Sorry I was mistaken, you can reprogram it. PROM does stand for Programable Read Only Memory, and since it can be reprogramed, it has to be an EEPROM (Electronically Erasable PROM).
I find it hard to believe that headers require a reprogram. Before I did the MAF conversion I had cat-back exhaust w/ no problems. But I haven't put headers w/ the stock computer so I can't say for sure.
Anything that causes major airflow changes on EEC-IV speed density systems requires reprogramming because speed density cannot compensate. Headers definitely fit into this category. Even on EEC-V systems long tube headers cause a problem because of the O2 sensors. While a speed density system will/may run alright with headers the a/f ratio is probably not going to be optimal. You really need to either install an O2 sensor on the header or use a MIL eliminator AND get the A/F ratio adjusted. The reason for checking A/F ratio is just because you're not throwing a code doesn't mean it's running the right ratio because hacking up the system is bound to throw off the reading, especially with as crappy as the stock sensor is.
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Senior User
Joined: Aug 2003
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From: Eastern, Iowa
Howdy, Ken.
So if I do put long tube headers on it with a bung for the O2 sensor (on the right hand bank), will I be OK running true duals with dual hi-flow cats and a K&N? Or should I do shortys?
What's MIL stand for?
How can I check/change the A/F ratio? Does that require a chip?
Can I get an aftermarket sensor that is better than stock?
SO many questions! Sorry! Thought I had 'er all figgered!
So if I do put long tube headers on it with a bung for the O2 sensor (on the right hand bank), will I be OK running true duals with dual hi-flow cats and a K&N? Or should I do shortys?
What's MIL stand for?
How can I check/change the A/F ratio? Does that require a chip?
Can I get an aftermarket sensor that is better than stock?
SO many questions! Sorry! Thought I had 'er all figgered!
Posting Guru
Joined: Dec 2003
Posts: 2,155
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From: Centerville, Iowa
Honestly, you should go ahead and get the chip anyways. A chip with all those other modifications is going to bring everything in even tighter and allow those mods to make even more power. Plus, you'd be able to even wring more power out of a stock engine....and money isn't a concern I'd guess because those mods you're wanting to do aren't the cheapest either.
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Senior User
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From: Eastern, Iowa
And I may just do that. This thread started with me looking for low-buck non-chip ideas to make a little more power while I am putting together my stroker torque beast, whereupon I will definitely need to be chipped.
In the meantime, I am wanting to stay away from doing enough mods to rechip, just wanting to make a little more power (always).
What do you guys think - $500-$600 for the exhaust, $150 for the filter, $15 for the belt, $50-60 for the ignition parts.
And the chip should I decide to go that route? I'm clueless there...j
In the meantime, I am wanting to stay away from doing enough mods to rechip, just wanting to make a little more power (always).
What do you guys think - $500-$600 for the exhaust, $150 for the filter, $15 for the belt, $50-60 for the ignition parts.
And the chip should I decide to go that route? I'm clueless there...j
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Senior User
Joined: Aug 2003
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From: Eastern, Iowa
To put it differently, I want to go as far as I can without chipping because I KNOW I am going to have to chip it with the stroker, so I don't want to chip twice. Just some minor mods now while I wait for the big nasty 
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From: Eastern, Iowa
And I have thought about that recently - what the REAL cost would be of programming the chip once for minor mods, and then again for the stroker. Any thoughts there? Volume discounts from Motorhaven?? 
Ken, I am still torn on how much I can/should do to my truck before it needs a chip. I like the thought of freeing up 30HP with all of the discussed mods, but if it needs a chip, honestly I am thinking of simply a high flow filter and cat-back exhaust and leave it at that. Maybe the airpump bypass, too.
Unless the cost of "re-chipping" is reasonable.........
Ken, I am still torn on how much I can/should do to my truck before it needs a chip. I like the thought of freeing up 30HP with all of the discussed mods, but if it needs a chip, honestly I am thinking of simply a high flow filter and cat-back exhaust and leave it at that. Maybe the airpump bypass, too.
Unless the cost of "re-chipping" is reasonable.........
Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
Programming the chip for minor mods is just the cost of the chip. The stroker will require custom programming (http://www.motorhaven.com/customer/p...&cat=37&page=1) which is the same price initially or afterwards so your cost would be the same, except that you would have to pay for shipping twice.
If it were a non-custom reflash the price is much lower. Once you pay for custom programming you never have to pay for custom again, even if the mods are considered custom. You just pay a non-custom price: http://www.motorhaven.com/customer/p...&cat=37&page=1
If it were a non-custom reflash the price is much lower. Once you pay for custom programming you never have to pay for custom again, even if the mods are considered custom. You just pay a non-custom price: http://www.motorhaven.com/customer/p...&cat=37&page=1
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