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canhonkey · 11-02-2008, 09:47 AM

Hi All,
I'm new to the board. For the longest time I was sacrificing fuel economy for power..but no more! Behold the '91 Firefly convertible LE(same as Metro) I picked up for the wife's commute for a mere 600 dollars! 170k kms & never winter driven.

This will be her "limited edition" Firefly XFI , I want to do the XFI cam swap that MetroMPG did, advance the timing by doing the sprocket mod, and switch to a different transmission with lower final drive. Not going to mess with the computers or remove any piston rings. I'm thinking a transmission off of a per 95 Metro/swift/firefly with 1.3L SOHC motor would do this trick with its 3.52 final drive? I think these convertible's have a much higher final drive..so its gotta go! Any idea where I could source a transmission or XFI Cam? So far..I've checked out car-part.com and sent a few emails to DeltaCam and 3 Tech who both have cams in stock. Ideally I'd like an OEM cam..

So far, I've got a fresh timing belt, wires, dist cap, rotor button, accessory belt to put on it once I get that XFI Cam. I've also just put a new set of nordic winter 13" tires, they're 185 tall so the speedo reads 100kph when she's actually going 110! I know they aren't low rolling resistance, but she drives a pretty sketchy part of the 401 hwy everyday, averaging 200kms/day out of a 5 day week back and for to university. On top of that, she has shifts at the hospital most times on weekends so she's putting 1000-1200kms on the car/week...so..economy is a priority right now....

So I figure, with the taller tires, Cam swap, advanced timing and much lower final drive tranny..she should be getting some much improved Mpg!? Looking forward to your suggestions

Ken

11-02-2008, 09:47 AM	#1 (permalink)
canhonkey Penny Saver Join Date: Nov 2008 Location: Frankford, Ontario Posts: 22 Bumblebee - '91 Pontiac Firefly Convertible LE 90 day: 45.82 mpg (US) RRSP - '90 Yami FZR Last 3: 47.35 mpg (US) ECODeisel - '01 VW Jetta TDI 90 day: 52.46 mpg (US) Thanks: 0 Thanked 0 Times in 0 Posts	XFI'd Pontiac Firefly LE ..Convertible! Hi All, I'm new to the board. For the longest time I was sacrificing fuel economy for power..but no more! Behold the '91 Firefly convertible LE(same as Metro) I picked up for the wife's commute for a mere 600 dollars! 170k kms & never winter driven. This will be her "limited edition" Firefly XFI , I want to do the XFI cam swap that MetroMPG did, advance the timing by doing the sprocket mod, and switch to a different transmission with lower final drive. Not going to mess with the computers or remove any piston rings. I'm thinking a transmission off of a per 95 Metro/swift/firefly with 1.3L SOHC motor would do this trick with its 3.52 final drive? I think these convertible's have a much higher final drive..so its gotta go! Any idea where I could source a transmission or XFI Cam? So far..I've checked out car-part.com and sent a few emails to DeltaCam and 3 Tech who both have cams in stock. Ideally I'd like an OEM cam.. So far, I've got a fresh timing belt, wires, dist cap, rotor button, accessory belt to put on it once I get that XFI Cam. I've also just put a new set of nordic winter 13" tires, they're 185 tall so the speedo reads 100kph when she's actually going 110! I know they aren't low rolling resistance, but she drives a pretty sketchy part of the 401 hwy everyday, averaging 200kms/day out of a 5 day week back and for to university. On top of that, she has shifts at the hospital most times on weekends so she's putting 1000-1200kms on the car/week...so..economy is a priority right now.... So I figure, with the taller tires, Cam swap, advanced timing and much lower final drive tranny..she should be getting some much improved Mpg!? Looking forward to your suggestions Ken __________________ 91 Pontiac Firefly..convertible! Last edited by canhonkey; 11-02-2008 at 10:40 AM..