I went to the dyno today to get a “before” power measurement. The car is pretty much stock with an SLP air box and fresh wires, spark plugs, air & fuel filter, the A.I.R has been removed. High milage at 155K. The car runs well without noticable oil consumption or smoke.
The first pull came in at (SAE rated) 264.45 HP and 274.41 TQ.
The ONLY change I did for this test was to swap out the stock LS1 ignition coils to the big truck 6.0 coils with the heat sinks. I had the coils assembled on the correct brackets along with the correct coil wiring harnesses and the swap took about ten minutes. Not having the A.I.R piping in the way made the change easy. The fuel stuff on the left side is a bit in the way but for testing purposes, one bolt to the valve cover held it in place.
We waited a few minutes to get the temperature back to where we started the first pull at.
The result: 273.70 HP and 293.01 TQ. HP increase of 9.25 and TQ increase of 18.6.
Pretty well worth it I’d say! I’m gonna keep these things.
AND, the ride home showed better throttle response. It just felt crisper and reacted quicker on the highway.
Every book and website that discusses LS coils says they’re all the same yet look different due to the supplier. Has anybody done a back to back test like this?
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
Good question, I never though of that. No I did not. Perhaps brand new LS1 coils might perform better than the originals due to dust, dirt & grease on the old ones however I'm of the opinion that these coils either work or don't work. They don't "wear out", do they?
I had done this swap on my '94 LT1 with the LTCC kit and the response and driveability improvements were the same. I had never dyno'd it but it was surely a bit more powerful. On THAT car the swap was made from new LS1 coils to the truck coils. I suppose this means that I had done the comparison with new LS1 coils?
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
"A true hotrodder wouldn't be content until he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo
Don't be hatin' on my ride's numbers guys. The "before" test should be a hint that there's some mods in the works. It is dead stock with I'm sure the original O2 sensors and well rusted exhaust. And the milage on the rings? And I'm so sure that the little NY Mets decal on the hatch is also sucking away some power...
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
ive always believed that the truck coils are worth some hp over the fbody.
I'm pretty sure you're right. IIRC, a book I have at home showed that when tested by the former W2W guys, the truck style coils did show a gain over the f-body ones. I can't remember how much though.
__________________ -1996 Firebird 5.3 turbo swap in progress (while simultaneously building a ffi stroker lq4), FLT 4l80e w/Circle D 3400 'vert, 2006 z06 wheels, Firehawk hood, Fays2 Watts Link,4:10 LS (for now), BMR Tunnel-Mtd Torque Arm,BMR Sub Conn, BMR Turbo K-member,dual 340s,MP T-76, Synapse Gate and BOV, Turbosmart Eboost2, AEM UEGO....and more parts on the way!
That chick was doing Heineken give aways. It's at a movie house during Tribeca Film Festival week. Man those people are annoying!
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
Car looks good man. Whether your old coils were worn, or performing as new, you still ended up with some nice gains. And that is exactly what we are all looking for in each one of our upgrades. Good job.
__________________
Law of Mechanical Repair, After your hands become coated with grease, your nose will begin to itch and you'll have to pee.
Law of Probability, The probability of being watched is directly proportional to the stupidity of your act.
LS3 418, 248/254 615/595 with XER and XE lobes. AFR 225, 1 7/8 Hedman headers from BRP. 200-4R. 9" Ford rear with 3:50 gears.
The LS1 coil brackets will not mount the truck coils.
The LS1 coil wiring harnesses will NOT work as the plugs and pin-outs on the coil end is different. The coil harness to engine harness plug is the same and the new harness will plug in directly.
The truck coil brackets are 10457736, 2 needed.
The LS2 wiring harnesses are 12601824, 2 needed.
The coils are 10457730 (AC D585), 8 needed.
GM/Chevy trucks had several different coils and brackets so be careful. These coils are the ones with the heat sink on the backside. Brackets from other coils will not fit.
On the the LS1 F-body cars, the A.I.R. piping will be in the way. On the passenger side, the fuel line and solonoid will be in the way. A little fanageling will be needed to get it in.
I had a set of LS7 spark plug wires laying around and they fit & look nicely.
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
Last edited by Paul Bell; 05-13-2009 at 12:55 AM..
Yup. Everybody loves the color but nobody bought it. Few were ordered. None were sent to SLP for the WS6 option. Dupli-color doesn't make a touch up paint and neither does GM. I had to get some paint mixed up for chips and stuff.
__________________ -1999 Trans Am A4, 2.73 rear, ZR1 wheels 17 X 9 & 17 X 11, UMI front end EVERYTHING, SSBC 13" 4 piston stoppers, truck coil conversion. -71 Monte Carlo SS454 496 CID, 600HP
The LS1 coil brackets will not mount the truck coils.
The LS1 coil wiring harnesses will NOT work as the plugs and pin-outs are different. The coil harness to engine harness plug is the same and the new harness will plug in directly.
The truck coil brackets are 10457736, 2 needed.
The LS2 wiring harnesses are 12601824, 2 needed.
The coils are 10457730 (AC D585), 8 needed.
GM/Chevy trucks had several different coils and brackets so be careful. These coils are the ones with the heat sink on the backside. Brackets from other coils will not fit.
On the the LS1 F-body cars, the A.I.R. piping will be in the way. On the passenger side, the fuel line and solonoid will be in the way. A little fanageling will be needed to get it in.
I had a set of LS7 spark plug wires laying around and they fit & look nicely.
Do you have a pic of your motor with the new coils? And do you have a pic of the harness you used?
And i do not have my A.I.R. pump on my car either
__________________
2002 Trans AmCAM ONLY - 11.8 @ 119 with a 1.8 60'
228/232 .588/.595 @110+4 | QTP LTs | Kooks O/R Y-Pipe | Flowmaster Merge | Powerstick Bullet Muffler | DMH E-CutOut | GMMG Catback
85mm MAF/Lid | 42# Injectors | FTRA | ASP UDP | P&P TB | 160 T-stat | Textralia Z Grip 419 RWHP and 385 RWTQ
Coil swap yields 9.25 HP and 18.6 TQ 
01 SS Rally Red A4 #4987 
Nice to see a side-by-side like that.
