2002 Z-28 swap to truck coils.
10-08-2009, 07:45 PM
#81
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First start after installing them it seemed to idle smoother and react to the pedal a little better. 2+s
I went out for a very spirited drive(haven't done that in a while) I think it revs faster now. I hit the rev limiter once in 1st. Butt dyno? I think I may have gained something
My coils are ugly as sin now lol... They have a little rust on them, but I did get the heat sink ones. Driver's side went on perfectly and the drivers side, not so much. Driver's side has 1 bolt in the rack to hold it down and the rest is black zip tied lol.
btw I found the ONLY D585 in a salvage yard in ALL OF NASHVILLE I called every salvage yard that showed up on google. I did pay $200 as well.
Guess what my coils came off of? A clunkered 2003 GMC 1500. I thought the vehicles would be immediatly crushed, but they said not yet. They can keep them for a little while. Then they get crushed.
I had it dynoed last year with the same stuff I've got now, minus my truck coils.
I like that part too about the gains. I don't really feel like going to get a dyno though. I'm not rich you know lol
I will say my car does feel different. I've got full boltons
btw Nowhere... have I seen prices near $100 for the set of 8... They're always $25/piece and up. Unless you find someone who is kinda clueless I don't think you're getting them that cheap.
Everybody keeps saying $125 or $100, but they never provide links.
I went out for a very spirited drive(haven't done that in a while) I think it revs faster now. I hit the rev limiter once in 1st. Butt dyno? I think I may have gained something
My coils are ugly as sin now lol... They have a little rust on them, but I did get the heat sink ones. Driver's side went on perfectly and the drivers side, not so much. Driver's side has 1 bolt in the rack to hold it down and the rest is black zip tied lol.
btw I found the ONLY D585 in a salvage yard in ALL OF NASHVILLE I called every salvage yard that showed up on google. I did pay $200 as well.
Guess what my coils came off of? A clunkered 2003 GMC 1500. I thought the vehicles would be immediatly crushed, but they said not yet. They can keep them for a little while. Then they get crushed.
What are your mods and are you planning on doing a before and after on the dyno?
I saw one funny post on the corvette forum saying that somebody must have a warehouse full of these they are trying to get rid of.
But I also saw an interesting post, that if somebody had unlimited access to a dyno, they could do 3 pulls with the stock coils and then 3 pulls with the truck coils to see what the average gain is. That would show the doubters that the gains are real, and not just from too many variables from one dyno pull to the next.
After going back and looking at the graph again, I like that it seems to be a consistant gain over the entire curve. It's not like the peak numbers were the only part that was better, its a nice gain the whole way.
I saw one funny post on the corvette forum saying that somebody must have a warehouse full of these they are trying to get rid of.
But I also saw an interesting post, that if somebody had unlimited access to a dyno, they could do 3 pulls with the stock coils and then 3 pulls with the truck coils to see what the average gain is. That would show the doubters that the gains are real, and not just from too many variables from one dyno pull to the next.
After going back and looking at the graph again, I like that it seems to be a consistant gain over the entire curve. It's not like the peak numbers were the only part that was better, its a nice gain the whole way.
I like that part too about the gains. I don't really feel like going to get a dyno though. I'm not rich you know lol
I will say my car does feel different. I've got full boltons
btw Nowhere... have I seen prices near $100 for the set of 8... They're always $25/piece and up. Unless you find someone who is kinda clueless I don't think you're getting them that cheap.
Everybody keeps saying $125 or $100, but they never provide links.
Last edited by 7camaro7; 10-08-2009 at 08:04 PM.
10-08-2009, 09:45 PM
#83
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yea mine started having a little starting trouble as of late and after I seafoamed the gas tank and put these coils in I noticed a big difference in starting the car. The coils made the biggest difference in that.
Do it and let me know what you think of how your's feels.
I need to take the driver's side rack back off later on to trim it so it'll fit better and use bolts instead of zip ties.
Do it and let me know what you think of how your's feels.
I need to take the driver's side rack back off later on to trim it so it'll fit better and use bolts instead of zip ties.
10-08-2009, 09:53 PM
#84
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I bought a set of the D585 coils w/brackets and harness on Ebay. Beginning of next week I will be putting on the LSX 102 intake + 102TB on my LS3 427 the car will be run at a local 1/8 mile track next Thurs to compare the results to current setup w/Jeremy F ported intake+ 92 fast TB. Next Fri I will swap to the truck coils and compare the difference, weather conditions should be about 1800' to 2000' DA each day. The car runs 6.85-6.87 @ 101.5mph on every run as it sits very consistant bracket car.
10-08-2009, 10:13 PM
#85
jason2687 had asked earlier in this thread "So we can use truck coils from ANY truck with an LS1??? Or is the some sort of specifics involved???"
No. The coils are very specific, they are the truck coils with the external heat sinks. They need a different coil wiring harness and coil mounting bracket. Also, at least on a F or Y body car, you'll need to fool with some other engine componants that will be in the way.
It's starting to be a long thread and I'm trying to get a sticky faq posted but until then, every bit of information about the swap is here:
https://ls1tech.com/forums/generatio...p-18-6-tq.html
No. The coils are very specific, they are the truck coils with the external heat sinks. They need a different coil wiring harness and coil mounting bracket. Also, at least on a F or Y body car, you'll need to fool with some other engine componants that will be in the way.
It's starting to be a long thread and I'm trying to get a sticky faq posted but until then, every bit of information about the swap is here:
https://ls1tech.com/forums/generatio...p-18-6-tq.html
10-08-2009, 10:34 PM
#86
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I bought a set of the D585 coils w/brackets and harness on Ebay. Beginning of next week I will be putting on the LSX 102 intake + 102TB on my LS3 427 the car will be run at a local 1/8 mile track next Thurs to compare the results to current setup w/Jeremy F ported intake+ 92 fast TB. Next Fri I will swap to the truck coils and compare the difference, weather conditions should be about 1800' to 2000' DA each day. The car runs 6.85-6.87 @ 101.5mph on every run as it sits very consistant bracket car.
I think I'll get mine dynoed tomorrow. A place within 1hr of where I live dynos 3 pulls for $40. I'm interested in if I got any gains too.
by the way I dynoed there before and I put down 363rwhp/380tq std, and 344rwhp/360rwtq sae.
I should be able to compare my sae numbers and get a very accurate number with respect to my first pull there.
10-08-2009, 10:36 PM
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jason2687 had asked earlier in this thread "So we can use truck coils from ANY truck with an LS1??? Or is the some sort of specifics involved???"
No. The coils are very specific, they are the truck coils with the external heat sinks. They need a different coil wiring harness and coil mounting bracket. Also, at least on a F or Y body car, you'll need to fool with some other engine componants that will be in the way.
It's starting to be a long thread and I'm trying to get a sticky faq posted but until then, every bit of information about the swap is here:
https://ls1tech.com/forums/generatio...p-18-6-tq.html
No. The coils are very specific, they are the truck coils with the external heat sinks. They need a different coil wiring harness and coil mounting bracket. Also, at least on a F or Y body car, you'll need to fool with some other engine componants that will be in the way.
It's starting to be a long thread and I'm trying to get a sticky faq posted but until then, every bit of information about the swap is here:
https://ls1tech.com/forums/generatio...p-18-6-tq.html
10-09-2009, 02:33 PM
#91
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got dynoed... Last time I did not have the fan on the intake, but this time I did and I had these coils on. I gained 6rwhp and 2rwtq... I don't really recommend everybody go out and buy these coils unless you're bored.
I guess I'll keep them. It does start easier and feels slightly more responsive. I thought I felt something lol
now I've got 350rwhp/362rwtq sae
I guess I'll keep them. It does start easier and feels slightly more responsive. I thought I felt something lol
now I've got 350rwhp/362rwtq sae
10-09-2009, 05:00 PM
#93
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I have a set on the way. I might be able to get some back to back dyno tests. I know they produce more power. Plus they look much better than the square ls1 coils I now have now.
10-09-2009, 06:05 PM
#94
We tried them yesterday on the Tick Performance race car (cam only ls1 pulling to 7300-7500) and it didn't make a difference at all. I've always thought that .055 gap is way to wide for anything but a bone stock LS1. Anytime someone swaps a cam or just expects to rev higher than say 6300 the gap needs to be tightend up to .035. And I've seen on more than one occasion 7-10rwhp going from .055 gap to .035 I wonder if this test car was gapped on the high side and thats why the coils helped.
10-09-2009, 06:36 PM
#95
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would you mind asking the customer where he purchased them and how much they were? this seems like a great find!
nothing was changed. just swapped the coils.
to answer a few other questions.....
Its basically a plug and play swap. There was some minor drilling needed on the truck coil bracket to make it fit....but very minor.
No retune was needed.
I do not know what year truck coils they were. The customer brought them in with him. We did not provide them.
The car is a stock cube, bolt on car with a cam, long tubes, FAST 90 intake, 90mm TB, 243 heads with mild port work, A4, stall, 9 inch.
to answer a few other questions.....
Its basically a plug and play swap. There was some minor drilling needed on the truck coil bracket to make it fit....but very minor.
No retune was needed.
I do not know what year truck coils they were. The customer brought them in with him. We did not provide them.
The car is a stock cube, bolt on car with a cam, long tubes, FAST 90 intake, 90mm TB, 243 heads with mild port work, A4, stall, 9 inch.
10-09-2009, 06:39 PM
#96
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We tried them yesterday on the Tick Performance race car (cam only ls1 pulling to 7300-7500) and it didn't make a difference at all. I've always thought that .055 gap is way to wide for anything but a bone stock LS1. Anytime someone swaps a cam or just expects to rev higher than say 6300 the gap needs to be tightend up to .035. And I've seen on more than one occasion 7-10rwhp going from .055 gap to .035 I wonder if this test car was gapped on the high side and thats why the coils helped.
10-09-2009, 08:45 PM
#99
Swapping these coils onto a LS1 equipped engine has shown improvements in horsepower and torque. Some car owners who’ve done this swap have also reported better throttle response, engine smoothness and fuel economy. A few have done back to back dyno pulls to document the results. Power improvement results can vary from an increase high of 9 rwhp/18 rwtq to a low of 6 rwhp/2 rwtq. One shop showed no improvements at all. Obviously, results will vary and may be affected by other modifications done to the vehicle or the engine’s overall condition.