Now I got it, just wanted to make sure on that. As far as upgrading to the new style injectors would there still be concern with whether or not the 7427 could support the impedence of 4 injectors or do you happen to already know that the newer style ones will work? What is better about the new style injectors vs. the style that is on my system? Would I be better off to just ditch the old holley throttle bodies and use a couple of gm throttle bodies instead?Originally Posted by dave w
I've never understood this "horsepower limitation" of an ECM. Especially when there are many people that have gone beyond the theoretical "horsepower limitations" of the ECM they are using. I've seen the argument that they are unable to control an injector large enough to support XX HP, which I have yet to see in any application. I've seen other arguments that were based on measured (or calculated) air flow, that again is not a limitation of the ECM itself... The technology used in that ECM is a different story, and that may limit what the ECM can control, but is not directly relateable to a HP rating.
If you have two throttle bodies I would strongly suggest using two IACs. The distribution of air will be more even across all cylinders. Crossfire systems use dual IACs, for this very reason. Dual IACs will also function fine attached to a '7427 PCM.
I would just move over to GM throttle bodies, getting away from the Holley injectors that are known for issues, and giving you the ability to easily add the IACs.
You can run each pair of injectors in series when using the Delco ECM. This is what has been done to my friend's '71 Cutlass with a custom 4bbl TBI, and his girlfriend's Olds powered '89 Caprice. These cars get driven and BEATEN on regularly. They are using the '7060 PCM however, but the injector drivers are the same as the '7427.
The man who says something is impossible, is usually interrupted by the man doing it.
Six Shooter, I couldn't agree more with on the thought that an ecm shouldn't limit horsepower. I may not know a lot about this stuff yet but I just can't see how the ecm could have anything to do with your horsepower limit. I do see how cfm limitations of throttle bodies can definitely affect it since a given size throttle body just like a given size carb can only flow so much air. Same with injectors. I'm acually thinking that is a very large part of my problem with my holley system. I think the 80 lbs/hr injectors may actually be capable of flowing far more fuel than the throttle bodies can (comparitively) flow air. At any rate, do you feel the 7427 is the good choice for what I'm trying to do or do you think the 7060 is a better choice? I'm also curious if you have any recomendations as to what gm throttle bodies you would recommend?
I would go with the '7427, since they are easier to find and have more in the bin to be able to fine tune, along with being more hacked in the DIY community. The only reason that the '7060s were used in my friend's cars was because one of the swaps was done before he and I met, and the '7060 was the easiest ECM to use with his combo, that also has 4L80E behind the Olds engines. He had a well known aftermarket EFI supplier do the tuning years ago, I now tune his cars. We've discussed swapping over to the '7427, but that would mean basically starting from scratch on the tune, and his car is FAR from stock, so it's been pretty much decided the swap would not really gain anything.
Just to give some ideas of what is being used on the Olds engines, one being a 465 (ish) CID, Edlebrock heads, fairly large cam (270+ degrees duration), 10 (ish):1 SCR, I believe Torker intake, long tube headers, 3" dual exhaust, uses a custom 4bbl TBI made from a bored out 454 throttle body and a 350 throttle body, and flows somewhere around 1150 CFM IIRC. the other engine, which is a pretty much stock 455, Same intake as the other, small cam (but not a stock cam), stock manifolds, 2.5" dual exhaust, uses a custom throttle body made from two 350 throttle bodies, I don't recall the flow rating on it.
So I would use nothing less than 454 throttle bodies, if I had to have only 2 bbls in your case. If it was my own car and had to use throttle bodies (I would likely swap to MPFI if it were my car in all honesty), I would make a couple 4 bbl throttle bodies. ;)
The man who says something is impossible, is usually interrupted by the man doing it.
OH wow, that adds an entirely new dimension of thought to what I'm doing with this. Thanks so much for all the great advice there!!! I had considered going with MPFI but I kinda want to stick with throttle bodies just to retain some nostalgia to the look of the system since I am currently planning on transfering this engine and injection system into my wifes 62 skylark. Since we just touched on 454's do you have any thoughts on a '96 7.4 litre vortec twin turbo using the stock vortec injection system?
I have a new project I'm helping with, 2005 GTO 6.0 Liter E40 computer. This is the first time I've worked with the E40. Fun stuff, someone cut some wires!see attached picture.
Now on to some of the 2005 GTO wiring schematics.
It's been an interesting year for me:
My first experience with an E38 computer.
My first experience with an E40 computer.
My first experience with $12P (1227165 ECM)
Built and sold 8 LSx harness.
Heck, I even got to play with a MEFI system that someone wired wrong. It's such a nice thing when wiring is done correctly!
I've only taken 2 sick days this year from my full time day job, and those were used so I could road trip to visit Eagle Mark.
dave w
funning thing happen this week at work, had a 89 c2500 an a 95 I think k 2500 both where 350 engines. some one had replaced the dist modgule and the plastic conector had deteriated that hold the green and white wire to the modgule. they got the wires backwards trucks didn't run very good.the fuel pump was bad on the 89 plus the wires wrong,the 95 had a fairly new walker cat that failed and stoped up the exaushts the man thought the modgule was bad and he changed it an put the green wire on the outside connector an white on the inside., wouldnot hardly idle. switched the wires it run good at idle give it a little gas [map low tps out of range egr failure ] put a back pressure gauge on it slight throttle would peg the gauge. any way magnetic pick up wires to modgule green in side white to the out side plug. it is just strange to me getting 2 of them the same way in 2 days.
gotta love cam run-in day one of the meanest sounding inline sixes ive ever built 2000rpm cam run-in video its a decient size turbo grind 240/240@0.050
My email got hacked!
Not really sure what happened. Got online this morning and have a email from a address I dont know. The subject line was "response to your request". I dont open it thinking its spam, casue I know I have not sent any emails. A min or two later, I get another one. Thought it was strange, but just deleted it. I get up, go to the bathroom and get another email, from my mom, that was just a question mark and the original quoted message that was just my name that was a link, and some strange random quote at the bottom. I then notice my spam folder is full of 66 messages. I check it and they are all returned emails (like what happenes when you send a email to a address thats no good) They show what addres they were sent to and its ones from my email address book, like old outdated ones. I then get a email from myself to my email address on my phone, same message, my name as a link and a random strage quote at the bottom. I know by then I had got hacked or something. I changed my password right then but thats all I could do cause I was about to run late for work.
I get home this afternoon. I deleted every single contact from my email account. For some reason, it was set to automaticly add any email address I send a email to. So I had several years worth. I then turn that feature off. I check my sent folder and nothing is in there except for the ones I actually sent. And I had not sent any emails in a couple months. How could these emails be sent out without it showing I sent them in my outbox? Idk if this was a hacker or a virus. I dont even know how to tell. But I'm thinking virus, cause I could still log into my email fine. Most I read online of actual hackers, the passwords get changed and the person cant log in. So I'm thinnking virus. But I do not go to strange sites, I never ever ever download attachments in emails, and rarely click links. The only links I have clicked in recent memory are links to track packages from places like rockauto and summit racing. I delete any emails I dont know or are not expecting. So I have no clue how I got this.
I ran spybot search and distroy. I just downloaded and run malwarebytes anti malware and then run a manual scan with my regular antivirus (bitdefender 8). They did not find anything. WTF?
79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy
93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver
99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.
my yahoo account does this occasionally..... i'm thinking it is a server-side issue considering the password a hacker would need to produce to get into my account.
1995 Chevrolet Monte Carlo LS 3100 + 4T60E
i get emails from myself regular its so the spam emails get past your filter search getting emails from my own email address
Is it an AOL account? They get hacked frequently.
A separate program could be running that sends to addresses from your book and your internet provider's mail server settings. Undeliverable returns would show up in your inbox but nothing would be recorded in the sent box.
Years ago I wrote a program that would take incoming spam, add the sender's addy to a list of addresses, and forward the spam to everyone on the list. Each new spam meant a new "to" address in the list and another message bounced out. My ISP called me one day because the software was sending messages 24/7. Said it would have to stop or I would need a commercial account. None of those outgoing messages were saved in my sent box.
I regularly start "task manager" and look for running programs that don't belong. If you do it often enough you'll get to know what's normally there. And if you have a software firewall you should be able to see what programs are attempting to access the internet. Put a junk address in your address book and see if there's any activity trying to send a spam message. Also, depending on Winnows version you can see when files were added in the control panel. Program causing problem is probably fairly new.
Some of this software has a life of its own.
Yes, it is a aol account. I pretty much never send any actual email. When I need to contact family or friends, I call or text from my phone. I sometimes recieve email from them, but rearly send any. Pretty much all I have ever used my email for, is for stuff like delivery confirmations when ordering stuff online, contacting people when buying/selling stuff on forums like here, and anything that requires a account (like forums) that need a valid email.
Hopefully deleteing the address book will help. I may try what you suggest, and try adding a few fake address and see if something tries to send email to them.
Is there any way to figure out if it was on my end or the server end? I opened the task manager and looked around. Nothing out of the ordnairy on the main parts. But there is so much stuff in the other places, I wouldnt know what is and whats not supposed to be there.
79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy
93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver
99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.
someone hacked my email [msn.com] a year or so ago. sending emails out about I guess mail order russion brides.[ porn] I don't get on porn sights contacted msn they told me they would investigate ,in the mean time start another email account because they had closed my old one. that was the last I herd from msn.
this morning i did the first read test of my prototype ee flash tool
t-side was perfect, e-side became corrupt about halfway, but it's a great start, i think even though the requests are serialized, i pushed the timing a bit too tight.
can't really test write until i socket an ecm, not 'just in case' but so i can test and see what happens if i introduce noise and force a packet checksum to fail.
still, exciting progress
Posting Permissions
Reply With Quote
Bookmarks