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Any old IT7, Pro7, Spec RX7 racers here?


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#1
Alberto

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I'm curious about prep tips for these cars - suspension setup, brakes, diff.

 

Is there anyone on here who used to race these?

 

 


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#2
Bench Racer

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1985 Mazda RX7 Spec7 converted to ITA. Don't remember Spec7 if suspension was adjustable. In same RX7, ITA trim adjustable suspension including shocks, 4:88 L/S diff, Paul Yaw carburetor, FPR/gauge, special coils (don't remember brand), header/exhaust system (don't remember brand) brake ducts, adjustable brake proportion valve and more I'm not remembering. Car had way more talent than driver. After a BIG situation where the rear end wanted to lead, it's parts were sold all over east of the mighty Mississippi. 

 

EDIT:

Old brain also, thanks Steve. Suspension, Panhard rod and tri-link. Did similar front toe and a guy heated/welded solid rear axle housing to gain a tad of toe in. 


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#3
tynor

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I'll admit to being old.  And I raced an IT7 before switching to SM.  I'm probably not much of a source for useful info about setup.  Setup was "1/8" toe out" and as much camber as I could manage in the front.   I didn't have adjustable swaybars, so never had to worry about that. I think the rest of the suspension was the basic ground control RX7 IT setup of the day. Tokico shocks. 4:88 was the diff to have, but mine didn't have one.   Mine had MSD ignition, adjustable brake proportioning valve, Mike Van Steenberg's (ISC) brake ducts (I toasted countless rotors before I put in the brake cooling). I ran hawk blue pads - loved them in the RX7; hate them on the miata.  ISC's stainless header (a SS copy of the racing beat header).   Simple panhard rod - not watts or tri-link which I understand to work better.


Steve Tynor

'99 SM

Atlanta, GA

 

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#4
Alberto

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What did you guys use for LSD?  I'm referring to differentials ;)

Did you run 4x110 wheels or use the stuff off the GSL-SE?

 

Old is better than the alternative :)

 

Thanks.


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#5
tynor

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I'm not sure what a GSL-SE wheel is.  I used 4x110 13" panasports for drys and stock wheels for rains.   I honestly dont know what type of LSD I had. 


Steve Tynor

'99 SM

Atlanta, GA

 

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#6
MazdaSteve

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If I remember correctly, the WDCR SRX7 rule set did not allow the use of the GSL-SE diff. Bret de Pedro from RP Performance built a ton of these cars and was extremely knowledgeable when I built mine 14 years ago. I would contact him.
Seneca Motorsports




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