boricua74rx7

If it was me I would go with the half bridgeported.Also at least two msd ingition boxes.I would also go with a 650 holley double pumper.Make sure you have 67's for the highs and 65's for the lows.Make sure you get a bigger better holley fuel pump.7 psi or more.

boricua74rx7

get the 4.87 gear wheel for you're rear end.

darkling

welp13b bridgeport duel weber downdrafts lightened flywheel 4:11 stripped 79 body with fibreglass fenders no interior stay with 13 or 14 tires super sticky
remember the lighter the less hp you need to make it go fast . then add a 50 shot nos . also look into the gears in a se trans vs a non se they are closer in ratio .. bet u break the low 12's maybe the 11's depending on the wheel hook up

beastrx7

ok take your motor go bridgeport then get a 650 double pumper holley carb and add 200 shot of nos ur gonna fly youll need slicks to hook

blwfly

iTrader: (4)

alot of broad answers 11sec 1/4 mile is a pretty high goal
dont think anyone in this section has got those times with out turbo

theres someone with a peri port 13b with a 48ida and i think hes gettin low 13's
i think peri is the way to go for that low times i mean you will have to do every mod to the engine out there.

elwood

iTrader: (1)

A big question that only you can answer is how streetable you want the car to be. Extreme weight reduction can get you big gains, but it comes with a host of downsides -- noise, heat, cornering instability, etc. Some guys who are extremely serious about this strip their cars, remove all mastic and sealant, acid dip them to pare down the weight even more, then cut away anything that doesn't look necessary. If you do a search, the topic of weight reduction comes up every few months, and there are many posts on the topic.

Remember that cutting the weight in half is just as good as doubling the HP.

Aside: I remember seeing a documentary clip from a Trans Am tech inspector who was reviewing a car. He was talking to the crew after doing his inspection and leaned on the car. The sheetmetal on the roof was so thin, his elbow sank into it like it was tin foil. He said, "Er boys . . . I think we have a problem." They had acid dipped their car to the point there was barely anything left of the original skin.

ultimatejay

iTrader: (1)

You aint going to get there with 200hp power, unless the car weights less than 1500lbs or lighter. I can vouch for that. My rx2 with full 12a bridgeport made 195hp to the wheels and with posi ,4.88 gears and the car totally stripped down with no interior and a race seat did a best of 8.6 in the 8th which equates to around a low 13 second pass. My 60ft was a mere 2.1. I am now putting a ford 9" rearend and slicks but even with a good 60 ft of 1.4 that will cut my time down to high 12's. Getting down to the 11's is no simple task.

Your best bet is to go with a 13bpport, lightened and balanced rotating assy, with ceramic seals and a large ida carb 51 or larger, aftermarket rearend with posi or spool-better, slicks, and lighten your car as light as possible, while maintaining safety. Plan on spending big buck for all of this. 11's with an N/A rotary is going to cost bucks.

hatemy7

^ thanx everyone for all the ideas and options, man me and my brother are just eating this up. Good stuff. also once in a while we will run this in the streets also. lol. but we will see how this is going to go, plus its going be a few months b4 we get this car running you know. so thanx once again.

DriveFast7

iTrader: (1)

Well with a well built 13b Peripheral Port and 58mm Gene Berg IDA copy carb, you can make 350hp at the flywheel. Will that do it?

1BADSP

iTrader: (4)

I ran 12.7@110,13b Peripheral Port,t2 flywheel,stock rear end with 4:88's,in my Street RX-3SP,2100 pounds without me in it,it was cool to drive it to the track,bolt on the slicks,and go run in the 12's,i am installing a 9" in it for reliability purposes,full spool,35 spline 6:00 gear,and also changed to fuel injection,it should go into the 11's with the new setup,once i get use to the car,then i'll add the 175 of nitrous.

Hyper4mance2k

iTrader: (40)

2.1 60fts mean you can't drive... I did 1.8 60ft's on stock 185/70-13" tires... I only make 141 to the wheels and ran a 14.5@92 with stock 3.909's on average a tenth of a second faster 60ft equals half a second or more faster quatermile..

FirebirdSlayer666

iTrader: (3)

And you're trying to say that 59 extra horsepower is going to drop your time by 2.6 seconds? Sorry guy but the faster you go, the more power it takes to go faster

808rota

11 second runs very possible with out turbo,,,but you can't forget the juice...
a buddy of mine runs 11.1 ,13b pp ida,with 150 shot....but..if you wanted to know of the most getto pp 13b built= it was his.my point its a combination of driver,gearing,tuning, and wanting to go fo broke..

Jimbo II

PP 13b, 51 ida and high ratio diff you'll get there! It'll be an animal to drive but who cares haha!

I do high 13s with 13b extend port 48ida. Only just hooked 4th at the end though my diff ratio too low. I'd luv to get low 13s or high 12s

rotarydude

iTrader: (2)

I have a S4 assembly in an bastard 13b 4port block (that would be SE housings and 12a irons) in a stock bodied Rx4 coupe driver with rx7(79) tranny and rx4 rear end 3.60 gears i believe (no LSD) granted it is not all motor it uses a 5 inch s/c about 12-15lbs of boost i have over 200 passes at the track with a best ET 13.4, it could go faster but then would not be as nice to drive on the street.

so it is possible you have been given very good advice previous to that i would add the following

#1 lighten car
#2 ensure brakes and suspension very good
#3 see how fast you go before you do anything else
#4 minor engine mods (intake/carb, exhaust, clutch)
#5 see how fast you go
#6 if you still want to go faster look at safety mods first
#7 start replacing drivetrain (ie better gears, better transmission, better and wider tires)
#8 see how fast you go


Are you starting to see a pattern here It is alot of funny and very addictive. I believe the best part was seeing the difference that the individual parts made. It is easy to take someone else's pattern and replicate it, it is a lot more fun to do it in stages and get there

If it is all about speed and you just want to go under 12 seconds, get a P-port engine, good racing trans, tubbed ford 9 inch rear end with something around 4.88 gears, strip the car to nearly a bare shell, line her up and hang on tight, because it will get very, very loose but you will probably go under 12 seconds and you will probably get told to go home put in a few thousand dollars of safety equipment before you come back to play

datsun1200

My pop's car has a 13bpp,he's running 6.5 on gas..But his car is a datsun 1200,with a 9in ladder bar setup and 26/10in.The carb is a 850 holly,the funny gas is going to get use this year..Turbo 2 tranny,i told him let's get a clutcheless, a gforce 2000.And put the 28/11 1/2,to see what happen's,oo and gear ratio.Ill post pic tomorrow..

ultimatejay

iTrader: (1)

Umm, no 2.1 means I was spinning too much with the street tires. When I would lower my tire pressure down to hook up I would snap the stock axles. I already went through two and that is why I am putting a 9" in. When running a N/A you have to launch at a much higher rpm because that is where the power band is on a BP and PP and that is why in order to get good 60ft times you have to have a good rearend and slicks.

hatemy7

well a lot of you guys are stating that it would cost about 10k to do 11's, I really dont see that happening in our case, we can do the birdge ports, rebuild, we already have the car, engine,tranny, carb kit, jets, clutch and flywheel.

well Ive had that over the years lol.
But I what I do want to know is where to purchase all these rear ends that you guys are talking about or gearing?
I have a few guys that told me to put a mustang 5.0 rear end on to it but not sure it that is true.

AsianImage

11s are going to be pretty hard as many have said. Back in the days....yes I am an old man...I raced my RX2 here in So Cal at the Battle of the Imports...1997 I think.

I ran a 12.90, 112 mph - 1/4 mile...all motor, no nos, no turbo, at PALMDALE

1972 RX2

gutted with battery in trunk, 2 front seats and a 4 point roll cage
13B P Port
Weber 51 ida down draft
13" stretchies in the rear and stock steels in the front
posi rear end with major gearing...I forgot..it was more than 411. I mean cruising in 5th gear at 60mph I was like at 7500RPM.
dual straight pipes shoved in to a 3" tube muffler at the end


sooo...with all that crap...I was only able to break 13s. And my car is much lighter than a rx7. Its a tough goal to reach...I don't know if it is possible.

hatemy7

^ damm...thanks for motivation. jk

Man_in_black49464

iTrader: (1)

4 rotor N/A with a bridge port

Or 12a with Aluminum everything engine related
Big port, Big Carb
strip everything off the body that isn't essential then replace the essentials with a aluminum or carbon
Then after all that still only run 13 maybe 12's

Or just cut the car into a drag shell and say its a top fuel car....LOL

Jimbo II

Theres a guy here that runs low 11s high tens in a street class rx3 coupe with a 13b pp. No nos, no turbo. Just feral as gear changes and a jacked up rear end with some sticky as slicks.

Also quad rotor pp batty with a power glide and that runs mid nines. Full street trim. Ran low tens with standy 6 speed and clutch and a locked diff.

Just get that launch sussed out.

Hyper4mance2k

iTrader: (40)

and a 500lb diet. might i remind you i'm 250 and the car was a full weight 83gsl. so were talking 2800lbs. get the car sub ton and 200whp with slicks should do it. just my oppinion. there are plenty of people doing it. just cause most fast racers stay off of this forum doesn't mean it can't be done.

FirebirdSlayer666

iTrader: (3)

So then you're trying to tell us you pulled a 1.8 60' in a 2800lbs car with 141whp with 185/70 tires. Dude if you claim that you better back it up with a time slip cause I just don't see it happening

ultimatejay

iTrader: (1)

Rene Franco on these forums runs an all motor first gen rx7-13bpp. His best time is 10.30 and he is very close to running 9's- he just has to go to the race track again. He said his car weights around 2200-2300 and he is also running stock suspension and small slicks with a 12bolt rearend. So 11's are very very attainable, you just have to know what your doing and expect to pay for it. If you did all the work yourself or most of it you could get there for around $5000-6000

Here's a vid from one of his runs for motivation.

http://www.youtube.com/watch?v=qZdYQin1rng