LT1 into RX7
Registered User
Joined: May 2000
Posts: 799
From: Redmond, WA
True.
You just have to remember that 2nd and 3rd gen. RX-7s have short ring and pinion gears (4.10:1 for manual cars and 3.90:1 for automatics) and a 700R4/4L60E's 4th gear (0.70:1) is going to put the engine at about 2,700 rpm @ 70 mph with a stock diameter tire (P225/50-16 or ~24.8" tall for a 3rd gen.). However, there are now conversion kits available for installing Ford Cobra 8.8" IRS differentials in both 2nd and 3rd gen. RX-7s, so you can have an automatic transmission and get your fuel economy back.
You just have to remember that 2nd and 3rd gen. RX-7s have short ring and pinion gears (4.10:1 for manual cars and 3.90:1 for automatics) and a 700R4/4L60E's 4th gear (0.70:1) is going to put the engine at about 2,700 rpm @ 70 mph with a stock diameter tire (P225/50-16 or ~24.8" tall for a 3rd gen.). However, there are now conversion kits available for installing Ford Cobra 8.8" IRS differentials in both 2nd and 3rd gen. RX-7s, so you can have an automatic transmission and get your fuel economy back.
Registered User
Joined: Jun 2004
Posts: 411
True.
You just have to remember that 2nd and 3rd gen. RX-7s have short ring and pinion gears (4.10:1 for manual cars and 3.90:1 for automatics) and a 700R4/4L60E's 4th gear (0.70:1) is going to put the engine at about 2,700 rpm @ 70 mph with a stock diameter tire (P225/50-16 or ~24.8" tall for a 3rd gen.). However, there are now conversion kits available for installing Ford Cobra 8.8" IRS differentials in both 2nd and 3rd gen. RX-7s, so you can have an automatic transmission and get your fuel economy back.
You just have to remember that 2nd and 3rd gen. RX-7s have short ring and pinion gears (4.10:1 for manual cars and 3.90:1 for automatics) and a 700R4/4L60E's 4th gear (0.70:1) is going to put the engine at about 2,700 rpm @ 70 mph with a stock diameter tire (P225/50-16 or ~24.8" tall for a 3rd gen.). However, there are now conversion kits available for installing Ford Cobra 8.8" IRS differentials in both 2nd and 3rd gen. RX-7s, so you can have an automatic transmission and get your fuel economy back.
Might make for a good drifting package though with the front end weight. If your into that sorta thing. I like goin straight myself.
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Joined: May 2000
Posts: 799
From: Redmond, WA
Registered User
Joined: Jun 2004
Posts: 411
3rd gen. RX-7/LS1 conversions typically end up very close to the stock 50/50 weight distribution and the conversion only adds about 60 lbs. for those who keep their power steering and air conditioning and have to have emissions equipment. Afterward, they go straight and turn corners just fine.
Registered User
Joined: Mar 2004
Posts: 189
From: Central Cali.
CPT cars, last car on the page.
That's how a light mazda hooks a low first gear with 4.10's a 3600 stall and a 150 shot with 245 drag radials.
Thread Starter
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Joined: Aug 2006
Posts: 3,705
From: Kansas
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Joined: Mar 2006
Posts: 2,307
From: Haverhill MA
good ? i was wondering that myself
Registered User
Joined: May 2000
Posts: 799
From: Redmond, WA
What's left to see?
JTR (Jags That Run) makes long tube headers for LSx engines in 3rd gen. RX-7s.
https://shell7.tdl.com/~jags/Mazda-R...-V8_Order.html
Originally Posted by reamo04
what im curious about, is do u have to get custom made headers to work with them or something, or will f-body headers work?
https://shell7.tdl.com/~jags/Mazda-R...-V8_Order.html
Thread Starter
Registered User
Joined: Aug 2006
Posts: 3,705
From: Kansas
What's left to see?
JTR (Jags That Run) makes long tube headers for LSx engines in 3rd gen. RX-7s.
https://shell7.tdl.com/~jags/Mazda-R...-V8_Order.html
JTR (Jags That Run) makes long tube headers for LSx engines in 3rd gen. RX-7s.
https://shell7.tdl.com/~jags/Mazda-R...-V8_Order.html