Alright question is easy enough, I run 15.2 with only intake and exhaust on my 86. I did this on bald tires but i did it consistanly, so my question, with new and wider tires, and a tuned SAFC i should be in 14s right? and would a RB header offer a significant increase? I currently have 3 inch pipe to rb cat back. Thanks

 

I have read about NA's that have extensive mods such as streetports or bigger, port-matched intakes, tuned exhausts, etc. that barely break into 14's. Not that I don't believe you, but just sounds a little far-fetched. I don't think you'll hit 14's with just what you listed.

BTW, what kind of exhaust?

 

Yes it can be done, I have heard guys doing it before. What model is it? And yes a RB header will add noticable power.

 

My car is as follows:
1986 Mazda RX-7 base N/A
cone filter
Exhaust - 3inch pipe from the stock exhasut manifold back to racing beat cat back.
If you search my name you'll find my timeslip i posted.
15.277 @ 89.10 mph with a 2.1s 60ft
gaining 3/10ths from an SAFC and tires that aren't smooth doesn't seem that off to me, any1 else got an idea?

 

u can do it

 

Id have bet damn good money my N/A was capable of a mid 14 second run. I had a few more mods than you though. Ill list what I had done before my turbo swap:

Superchips reprogrammed ECU
RB Header
Bonez H-F cat
Greddy Cat-back
GTUs 4.3 rear end
Miata Torsen LSD
RB aluminum Flywheel
ACT X-treme clutch/pressure plate
K&N Cone w/HKS adapter
Port matched Intake Manifolds
Pineapple Aux port sleeves
BBS 'Vert wheels (11.5lbs each)
A few weight reduction stuff, etc

The car was very quick for a N/A IMO, not too far off speed wise as my Turbo2 was with an RB 2.5" Turbo-back. If you cant cut a 1.9 or so 60" (gonna be tough, but not impossible) you should break 14s. Your trap speed is pretty low though, so its gonna have to be all in that launch. Good luck I will get another N/A once my T2 is done..theyre just fun.

 

Glad to see that some1 still thinks N/As are fun lol, I think its more of a chalenge. How about those pineappe racing aux sleeves? they worth it?

 

For $50 I dont see a point in not getting them. I put them in at the same time I port-matched my intake, and installed my RB header, so I cant comment on their gain alone.

 

well after doin all that what was the gain like cause those are all things i've considered, I know it sounds far fetched but I'd like to be in low 14's NA stock port, then turbo my NA

 

i have intake and exaust on my 86 as well, but i have a 3 inch down pipe going in to a y pipe down to 2 1/4 pipes, and also pacesetter headers and i am running a 14.3, so i think since we have about the same setup headers are well worth the money.

 

And what kind of port are you running on your motor?

 

Yeah something has got to be up ther that i don't know about that sounds like the same exhasut setup as me cept you have a header too, Sorry but I just can't belive that a header would knock off a full second

 

yah, time slips?!??!?

 

mines in other posts just search my name, i'm assuming you don't mean mine tho as its believeable but 14.3 thats unheard of

 

sorry forgot to put that in, i have had it street proted

 

no, i do not have the slips i juts moved to jacksonville fl, from gainesville, and i ran it at gainesvelle speedway, but in the move i lost alot of papers, dont believe it? i understand that is what everyone says until they run against me

 

iv heard this about 100000 times............

 

hmm.... i have all the mods in my sig and i would be ecstatic, but according to your times i should break into 13's with no problem

 

hehe depends on how much weight reduction u got

 

Driver vs. Car.

 

whatever peps. i hope to see you on the strip someday

 

We doubted you because you claimed it withou listing all your mods, and most people here know that stock ports with full exhaust and intake don't run low 14's, BTW what ECU do you use? I didn't think the stock one worked to great with ported motors

 

You can run the stock ECU with a ported motor, but it is a good idea to get some kind of an upgrade, ie SAFC. But it is definately not needed.

 

My stock ecu seems to work fine on my ported motor...

 

a 2.1 60' on bald tires that is pretty damm good for shitty tires