JMS custom chips
 

I know that custom burned chips can help the driveability of a modified engine, but how much HP does it release? I would love my car to run like stock, but are they really worth the money? Has anyone been dissapointed with a JMS chip? Thanks

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87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sh*t.

I am shopping around fo a chip.....I've gotten mixed opinions from everyone about chips from JMS, Diablo and SuperChips. I'm not sold on anyone of them yet......I checked out all 3 sites. The Diablo chip is about $325, the SuperChip is around $400. What's the JMS go for? Heard anything on any of these - good or bad?

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; 190 lb fp; FPR; TFS track heat Intake - 12.513 @ 112 mph (Pre-inj/fuelpump/FPR/intake)

I started off with a JMS chip. I ordered it because I didn't know when I would be able to go to a dyno after the installation of the supercharger. I am not knocking JMS, because I truly believe they did the best job they could with a mail order chip. Anyway, my first run with their program resulted in 344rwhp/361rwtq. I then had their chip reburned on the dyno and my best number was 391rwhp/377rwtq, as in my sig. My car ran like crap with the JMS chip. It backfired, spit out black smoke, and bucked consistently. After my dyno, all my problems went away. Just my .02

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FMS/Powerdyne 6psi SC, 73mm maf, 65mm TB, Cobra u/l intake, 24lb inj, 1.7" rockers, GT-40Y aluminum heads, Steeda #19 cam, MAC 1 5/8" long-tubes, MAC 2 1/2" pro-chamber, Dynomax Super Turbo mufflers, MAC 2 1/2" chromed exhaust, BBK 255lph fuel pump, FMS aluminum drive shaft, FMS 3.55 gears, and custom chip dyno-tuned by Swanson Performance. 391.0rwhp/377.5 rwtq SAE corrected