Simplest EFI harness?
Simplest EFI harness? I just want to preface this post by saying I have NO knowledge about efi. I'm a carb guy through and through, but I've got a problem.
Engine is a 502 RHS (being built by HKE
), mozez heads, big n/a power. I wanted to go carb'd, but the intake manifold would be limited in height to approximately 6'' (think super victor height roughly). Not exactly ideal for the engine. (it's rear engine so I'm pretty screwed in the height department - it's not like I can cut a hole in my hood and call it a day)
I could go EFI and get a custom manifold that will be absolutely perfect for the engine, but I don't understand EFI
I have a programmable solid state controller that deals with all my electrical (fuel pump, rad fans, etc.. etc....); if I wanted the simplest most stripped down EFI computer/wiring harness/etc.... setup that you just fire up something like lsedit or hp tuners and tune on the dyno, what would be the "best"?
In this case, "best" is defined as (1) cost doesn't matter (2) I don't need any super features of like a big stuff 3 or fast xfi (3) the most important aspect for me is simplicity ... I don't want it controlling my fuel pump or logging a bajillion parameters, just the basics that will be easy to wire up and tune on the dyno like any LS engine.
Help?
Engine is a 502 RHS (being built by HKE
), mozez heads, big n/a power. I wanted to go carb'd, but the intake manifold would be limited in height to approximately 6'' (think super victor height roughly). Not exactly ideal for the engine. (it's rear engine so I'm pretty screwed in the height department - it's not like I can cut a hole in my hood and call it a day)I could go EFI and get a custom manifold that will be absolutely perfect for the engine, but I don't understand EFI
I have a programmable solid state controller that deals with all my electrical (fuel pump, rad fans, etc.. etc....); if I wanted the simplest most stripped down EFI computer/wiring harness/etc.... setup that you just fire up something like lsedit or hp tuners and tune on the dyno, what would be the "best"?
In this case, "best" is defined as (1) cost doesn't matter (2) I don't need any super features of like a big stuff 3 or fast xfi (3) the most important aspect for me is simplicity ... I don't want it controlling my fuel pump or logging a bajillion parameters, just the basics that will be easy to wire up and tune on the dyno like any LS engine.
Help?
Wouldn't it be simpler though to use a standard GM harness like this one?
http://www.howellefi.com/customer/ls...nsmission.html
http://www.howellefi.com/customer/ls...nsmission.html
I'd juust look for a used one, a cheap OEM one and then just strip out what you don't need (or leave for future use). find one on here, the junk yards or ebay.
A plus would be that all of the connectors you need will be there and in the correct location (for the most part). Also you can use FSM for wiring Diagrams to get correct pin outs, color, gauge and all.
Else a new custom one or aftermarket (ie. Painless, etc) are like $500+ or a reworked one is like $350+.
A plus would be that all of the connectors you need will be there and in the correct location (for the most part). Also you can use FSM for wiring Diagrams to get correct pin outs, color, gauge and all.
Else a new custom one or aftermarket (ie. Painless, etc) are like $500+ or a reworked one is like $350+.
If simplicity is what the op is looking for I think the Megasquirt is the way to go, he already has something to control the fuel pumps, fans, and other accessories. Look here: http://lt1swap.com/vortec8100.htm
OEM is the way to go, if you don't understand EFI megasquirt is NOT what you want. Get a PSI harness or something like it with dbw and a fast 102 with an oem ecu. It'll start when you want it and not complain about the humidity because its mostly oem.
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Verdad Gallardo Other than something really spendy (not sure what kind of budget you're on, I'm assuming its not a big deal with an RHS 502), I don't know how much you're going to be able to fit with the height constraints. It seems most setups breathe MUCH better with a taller intake Cary's or a victor jr/super victor. I just don't know if you have the room. A pretty expensive option would be ITBs, theres been a bunch of really really high power NA stuff lately with them, and they're moderately low profile. As for the ECU, I'd still veer towards OEM if you're not comfortable with EFI or programming, it just works better without fussing.
Other than something really spendy (not sure what kind of budget you're on, I'm assuming its not a big deal with an RHS 502), I don't know how much you're going to be able to fit with the height constraints. It seems most setups breathe MUCH better with a taller intake Cary's or a victor jr/super victor. I just don't know if you have the room. A pretty expensive option would be ITBs, theres been a bunch of really really high power NA stuff lately with them, and they're moderately low profile. As for the ECU, I'd still veer towards OEM if you're not comfortable with EFI or programming, it just works better without fussing.
This is with a single plane gmpp intake (5 1/2'' height) + 1/2'' washers under card (to simulate the tall deck/mozez heads effect of raising height) + plastic 4150hp carb (4'') + air plenum hat sitting ontop of the carb (4'') .... as you can see it pokes above the rear clip, so knock it back by about 2''.
So I have, theoretically, 12'' to work with. I think if you did a crossram style intake you could get total height to around 10'' or so.
With EFI I don't do any tuning, just bring it to the local shop that did my z06. However, I also don't want a hundred wires and relays sticking all over the place for stuff I'll never use it for (e.g., fuel pump).
It does sound like some type of modified OEM setup ist he way I should be going.
With EFI I don't do any tuning, just bring it to the local shop that did my z06. However, I also don't want a hundred wires and relays sticking all over the place for stuff I'll never use it for (e.g., fuel pump).
It does sound like some type of modified OEM setup ist he way I should be going.
yeah with a standalone setup you're more likely to need to tweak some stuff now and then to get it to run just right. That's a pretty slick setup! I'd say something like a harrop ITB setup would sound AWESOME right behind your head and fit just right! I assume its a kit car or something, got any more pics?
It's an rcr superlite. My photobucket is open
http://s708.photobucket.com/albums/w...ast/?start=all
Sweet car, I'd love to build one someday. I think with the mozez setup you'd have to mill the harrop flange to the port size, but it would be WICKED!!
That car should be ABSURDLY fast with the RHS 502 with any intake on it. Maybe a sheetmetal one or something?
That car should be ABSURDLY fast with the RHS 502 with any intake on it. Maybe a sheetmetal one or something?
I wanted to go carb but fitment is questionable at best. Not to mention that because most people havn't done this type of setup, I have no idea how much of a restriction the intake manifold would be - I'd be capped to around a height of 5 1/2'' - 6'' for it, which would be wayyyyy less than ideal for this engine (shooting for around 850hp, pump gas, 6500ish rpm to minimize valvetrain wear&tear) . Unfortunately the only thing everybody is in agreement with is that that type of intake (6'' height for a carb) would be a restriction, but nobody agrees on how severe a restriction, so I'm thinking best not to gamble and just learn EFI, even though I don't want to
With 502 CI and Mozez heads, this isn't the build for a stock GM harness, or a DIY megasquirt. EFI isn't nearly as intimidating once you take the plunge and start learning. With the level of build you are already doing, you need a quality setup like a FAST or possibly the new Holley EFI system.
With 502 CI and Mozez heads, this isn't the build for a stock GM harness, or a DIY megasquirt. EFI isn't nearly as intimidating once you take the plunge and start learning. With the level of build you are already doing, you need a quality setup like a FAST or possibly the new Holley EFI system.
my isis solid state controller handles all the accessories like lighting, ignition, starter, fuel pump, radiator fans, etc... etc...
my digidash handles all the data logging parameters (oil/water/speed/lateral Gs/etc....)
So basically all I need is a computer to handle air/fuel and spark? It seems like getting an expert to cut out almost everything out a standard gm harness would be the way to go? Hook up the connectors, get it on the dyno and hp tuners/lsedit, a few hours later away you go?
With 502 CI and Mozez heads, this isn't the build for a stock GM harness, or a DIY megasquirt. EFI isn't nearly as intimidating once you take the plunge and start learning. With the level of build you are already doing, you need a quality setup like a FAST or possibly the new Holley EFI system.
I think you're right on the money, standalone gm harness, have someone good tune it, and have at it. The car will run great and work terrific. Especially with a mild cam, which I assume you'll be running if you're not going past 6500 =)
Our harness kits are pretty simple. You would just need to get a speed density cal and the tuning software and go to town. Our base harness and PCM kit sells for $585 with a $85 core return onthe PCM.
http://cgi.ebay.com/ebaymotors/E482-...Q5fCarQ5fParts
We are also an EFI Live dealer, which I would highly suggest since you won't have to pay extra for a speed density reflash. Plus, the scanning capabilities of EFI Live are far superior, imo, than HP Tuners. I have them both and choose EFI Live hands down every day of the week.
http://cgi.ebay.com/ebaymotors/E482-...Q5fCarQ5fParts
We are also an EFI Live dealer, which I would highly suggest since you won't have to pay extra for a speed density reflash. Plus, the scanning capabilities of EFI Live are far superior, imo, than HP Tuners. I have them both and choose EFI Live hands down every day of the week.
The Harrop could never feed Mozez heads/502ci even if it could bolt on. Not even close. A MAF setup shouldn't be within a 100 miles from this setup. OEM based EFI (Alpha N) setup would work and have the most support online.
However I would go to your tuner to review your engine combo and go with what he recommends. This way if something goes south he doesn't point the finger at you saying you went with an EFI solution he didn't personally recommend. There are plenty of ways to run your EFI reliably. OEM based, stand alones, etc.
**If** you trust him, let him lead you. Emphasis on the **IF**. If you have ANY doubts about your tuner, do not let him anywhere near your engine and spend the money to fly in someone you trust for a few days. It will cost you less in the long run.
You have the best LS builder in the world building your engine. Don't cut corners with your tuning and efi setup.
However I would go to your tuner to review your engine combo and go with what he recommends. This way if something goes south he doesn't point the finger at you saying you went with an EFI solution he didn't personally recommend. There are plenty of ways to run your EFI reliably. OEM based, stand alones, etc.
**If** you trust him, let him lead you. Emphasis on the **IF**. If you have ANY doubts about your tuner, do not let him anywhere near your engine and spend the money to fly in someone you trust for a few days. It will cost you less in the long run.
You have the best LS builder in the world building your engine. Don't cut corners with your tuning and efi setup.
The Harrop could never feed Mozez heads/502ci even if it could bolt on. Not even close. A MAF setup shouldn't be within a 100 miles from this setup. OEM based EFI (Alpha N) setup would work and have the most support online.
However I would go to your tuner to review your engine combo and go with what he recommends. This way if something goes south he doesn't point the finger at you saying you went with an EFI solution he didn't personally recommend. There are plenty of ways to run your EFI reliably. OEM based, stand alones, etc.
**If** you trust him, let him lead you. Emphasis on the **IF**. If you have ANY doubts about your tuner, do not let him anywhere near your engine and spend the money to fly in someone you trust for a few days. It will cost you less in the long run.
You have the best LS builder in the world building your engine. Don't cut corners with your tuning and efi setup.
However I would go to your tuner to review your engine combo and go with what he recommends. This way if something goes south he doesn't point the finger at you saying you went with an EFI solution he didn't personally recommend. There are plenty of ways to run your EFI reliably. OEM based, stand alones, etc.
**If** you trust him, let him lead you. Emphasis on the **IF**. If you have ANY doubts about your tuner, do not let him anywhere near your engine and spend the money to fly in someone you trust for a few days. It will cost you less in the long run.
You have the best LS builder in the world building your engine. Don't cut corners with your tuning and efi setup.
