Hi, I'm trying to help my brother build up his 1985 RX-7 with a 12a engine. So far he has run a 16 flat on stock tires, with gears and a CAI. What are guys using to hit high 13's or better? I would like to stay away from nitrous and power adders like turbos or superchargers. Any recomendations? What order would you upgrade things?

 

Two things for ya...

1. Exhaust (www.racingbeat.com www.mazdatrix.com)
2. Intake (Weber DCOE seems to be popular, Holley, and Dell'orto are common choices. See Racing Beat and MazdaTrix again.)

~T.J.

 

Street or Bridgeport might help.

 

13's? It's one of the three B's for you my friend.

 

BOOST -
BRIDGE -
BOTTLE -

 

See sig, that will get you into the 12's

 

1988 Rx-7 Convertible (All Stock) Pioneer DEHP740MP, Alpine MRVT130 amplifier, 1 10 inch MTX 6000 subwoofer in ported enclosure behind seats consealed in the spare tire compartment, and Alpine A series DDD Drive Component 6 1/2's and tweeters. Viper Alarm, with door locks, and power window roll up.

wow that runs 12's

 

i have bridgeport plates,and matching housings if you want to go that route....



PEace...

 

How much?

 

These aren't the ones that were in those pics a while ago are they? The ones with the suspect grinding towards the e-shaft?

 

What pictures? I missed that.

 

shhhhhhhhhhushhh


actually.. they arent..... they look that way, but arent, the end isnt cut as much.. so it looks pointy... i will take a big nice clear detailed picture...


Peace... I dunno how much they go for.. so what should I say? 600?

LOL


Thanx, LAterz, Andrew

 

Got bridge? I do, but its not in the 13's, maybe mid 14's with all junk i have in the car yet. The only way I think
to get to the 13's with a 12a is bridged with correctly tuned open exhuast, IDA carberation, DCOE weber 48-50, or Holley kit from racing beat, with all interior removed and slicks on back. Or with a engine breaking shot amount of NOS, or a extremely modified turbo'd 12a which would take the longest to make work, let alone work correctly by a non-knowledgable person to get 13's.

 

My car runs TWO twelves, MTX Thunder 8000's!

(ok ill shut up ;-) )

 

Hell screw the 13s, and put your money into your suspension and make it corner, what the hell does it matter how fast your car is in the 1/4 if your cant drive it??

ahh the power of g forces

 

Yeah, but the BEST G-Forces are those that put you against your seatback while accelerating.

 

I got an easier one...major streetporting and a light shot of nitrous...no need for bridge and carbon seals...you still need either a weber or holley...if you do nitrous I suggest a holley setup because of the intake manifold, better suited for the fogger jets.

that's what I'm doing but with a weber DCOE.

 

In simple terms its almost impossible to get a street legal 12a run a 13 second 1/4.

In reality low-mid 14s is more realistic unless:-
1 you go turbo and remain legal in most places; or
2. get it bridgeported and use it only on the track.

It comes down why you want a 13 second performance.

WackyRotary gave the best response which covers the two approaches. however I think a blowthrough turbo set-up could get you there with just bolt-on mods such as carb upgrade, good exhaust and header.

I agree that going for that level of performane will require upgrading the suspension, decent spring and shocks with a stiffer sway bar.

 

Haha, no no no u guys are going about it all wrong, the key to ur sucess is the almighty peripheral port, i mean it will only last u like 40 miles but ull get wut ur asking, hahaha just by a new motor. . Sorry im no help LOL unless ur crazy

 

yeap not easy, but doable

 

Perpheral Ports are verrrry reliable. Where did you get that idea?

Example: 1991 Lemans winner, Mazda 787B, 4 rotor peripheral port. Sustained 8000RPM+ for 24 hours at very high speed.

I think it lasted more than 40 miles.

 

I realilze this is only on a simulation, but all the different calculators I used to estimate 1/4 times read that a 200 + hp first gen could run in the high 13's. This is using a 13b, stock gearing, and 205/50R15 rubber.

As I said this was a simulation but it is a jump off point. What does the real world experience say? for example I know of a gentalman who put a stock series 4 turbo engine in his FB, utilizing the stock ecu and a gsl-se supension. He said he was running 13's. A stock series has about 180 hp, right? figuring exhaust he may be up to 200-220 hp. So by that one could therorise that 200-220 hp could get you into the 13's.

200 hp is 200 hp, no matter how you make it. correct? Of course torque comes into play also. I will leave that up to someone else to contimplate torque.

 

So long as you won't have to deal with emissions and don't mind a loud car, a well tuned bridgeport should get you there.

 

No runs 12 miles before something needs to be fixed on the POS. FC's are junk... Campaired the interior quality and such of a FB.

 

PM me , we got problems.. I got some questions...