A good Mod??

Okay so I've always wanted to drive a Turbo car. Unfortunately, I have been unsucessful in finding a TII motor for a GTU body that I am purchasing. Instead, I was able to locate a regular 13B motor in hopes to modify a turbo in it. I have a few questions for ya'll

a) What's the hp / torque / ratio of a regular 13B of an 87 RX7 SE?

b) What about for a TII and or the 13BTT?

c) On average, what's the 0 - 60 mph timing and qtr miles timing?

d) Will the regular 13B be able to handle boosts from a modified turbo?

e) If proceeding with (d) what am I looking to replace in the motor itself?

13B on an 87 is about 145/140 HP/TQ

TII on an 87? 185/185 ish I believe. 13BTT is the motor that's on a 2nd gen Turbo.

0-60 for 13B S4 is around 7.8
1/4 Mile is around 16.2

Regular 13B might only be able to handle mild boost of around 5lbs or so, but don't quote me on that.

It's cheaper to swap a turbo motor instead of turning an NA into a Turbo. You also need to swap the tranny.

OMG, That's friggin horrible. I thought it would be a monster since it's running on rotors. It only does 16.2 in a qtr mile, pushing 145hp? Wow, so are you telling me that my honda can beat an RX7 then (atleast a non-T). My single head honda all motor run's 15.1, no NOS, no turbo and no super. All I ever hear is rotary this, rotary that... it has persuaded me to go buy one, only to find out that my Honda with little work on it would probably kick half their a$$es. Somebody please re-confirm to me the number as I am trippin and buggin at the moment.

86-88 NA = 146 HP @ 6500 RPM w/ 138 Ft/lb @ 3500 RPM
86-88 Turbo = 182 @ 6500 RPM w/ 183 Ft/lb @ 3500 RPM
89-91 NA = 160 HP @ 7000 RPM w/ 140 Ft/lb @ 4000 RPM
89-91 Turbo = 200-202 @ 6500 RPM w/ 196 Ft/lb @ 3500 RPM
Infini IV = 215 @ 6500 RPM w/ 206 Ft/lb @ 3500 RPM

I will race your Honda! Bring it! lol!! The point is, the rotary is PAINFULLY easy to make faster. Dont let the factory numbers fool you. The car is FAST!


Jarrett

OMG, That's friggin horrible. I thought it would be a monster since it's running on rotors. It only does 16.2 in a qtr mile, pushing 145hp? Wow, so are you telling me that my honda can beat an RX7 then (atleast a non-T). My single head honda all motor run's 15.1, no NOS, no turbo and no super. All I ever hear is rotary this, rotary that... it has persuaded me to go buy one, only to find out that my Honda with little work on it would probably kick half their a$$es. Somebody please re-confirm to me the number as I am trippin and buggin at the moment.


So you bought one, just cause people SAID it's fast.. without even reseaching?

Your honda may be a BIT faster.. but the 7 will outhandle it any day.

I'd offer you a race in my stock 91 if my clutch wasn't going out :) 0-60 is supposed to be 7.2 but my best was just under 8 seconds, take into consideration I've only driven 5spd for like 2-2 1/2 months and my tires are horrible so I can't launch at all... and 1/4 mile time is said to be 15.9, never ran mine though. just sell the rx7 body and keep your honda, thats my honest opinion cuz you don't seem to know anything about rx7's or rotary engines all together, so keep your honda, it won't break down on you

Non-tourbo RX-7's are not that fast. I hear a lot of them run in the 14's mid to high. I have also seen a couple run in the high 13's.

The beuty of a non-turbo RX-7 is it will take a hell of a beating and keep coming back for more. As long as you maintain it correctly.

If you want a fast RX-7 you are looking for a turbo. It took very little for me to get my stock 87 down to a 13 flat 1/4 mile.

Now with my engine swap (you thought only honda guys did that huh?) I will be solidly in the 11's and my car isnt even set up for 1/4 mile. You do not want to come up against it in an Autocross or Road Course. If you think its fast in a straight line you should see it in turns.

Dollar for Dollar you cannot beat a Rotary for HP gains from mods.

A racing beat exhaust will get you 60 HP on a 87 Turbo. How many hondas gain 60 HP just from changing out the exhaust??

Besides, it's an absolutely PUNY 1.3liter motor making 145HP. I'd say that's quick for a mere 145HP. :)

Non-tourbo RX-7's are not that fast. I hear a lot of them run in the 14's mid to high. I have also seen a couple run in the high 13's.

The beuty of a non-turbo RX-7 is it will take a hell of a beating and keep coming back for more. As long as you maintain it correctly.

If you want a fast RX-7 you are looking for a turbo.

Dollar for Dollar you cannot beat a Rotary for HP gains from mods.

A racing beat exhaust will get you 60 HP on a 87 Turbo. How many hondas gain 60 HP just from changing out the exhaust??

racing beat also has the Catalytic Converter Replacement Pipe with Presilencer that gains 26 HP on a turbo($245) and 18 on a non-turbo($290)

and you want proof rx-7's are fast?
http://files.automotiveforums.com/gallery/watermark.php?file=/503/67256238_4-med.jpg
how about that for proof?

heres a drag rx-7
http://www.rotormaster.com.au/dragcars_rx7series2.asp
I've never seen a hond run a 7.5 or even go 172mph


and heres a site some guy made about a $3,000 rx-7 with just exhaust, spring, and tires vs. his $20,000+ modded prelude on the track... he ends up getting an rx-7 not long after...


And yes your right the NA rx7 isn't that fast, but it is definately fast on the track, better lateral acceleration than almost any other car(besides the turbo model and the FD ofcourse) but I think getting the NA into 12's in the quarter mile is easily possible with a large budget... personally I just want to eventually get my car into low 13's as a non-turbo and reliable... and be set up for the track/drifting(with different tires on the back ofcourse)
but the non-turbo can get into the high 14's without a ton of money and still be very very reliable...

hAhA... okay now, don't hate on Honda's now. I was just kidding about the a$$ kicking RX7's and stuff. I know they're pretty quick. Well, like I stated in a thread I posted about 2 weeks ago, I was quite amaze and inspired one time when a friend of a friend came from out of town with his RX7 to race a Viper in the Boston Area. The guy popped a wheelie and ate up the viper right from start. We then head up to the tracks in NH that weekend and he hit up a 9 secs flat.

Okay!! So, you guys got me. I don't know squat about RX7's. But guys... are you serious about the 60HP on a Racing Beat exhaust and 18HP on their cat converter?? Well, on average, how much $$ am I looking at for the exhaust?? Also, how much HP's will I get out from a non-turbo? Many that's some crazy HP gains. Hey- Ya'll just playing with my head huh??

Actually, the gains from the RB system are quite signifigant. If you want my opinion, the N/A just doesnt have the potential to be a REAL fast car. The Turbo II does. IF all you want is sheer acceleration, then you may want to consider another car. If you want good acceleration, coupled with handling the likes of which youve never experienced before, go with that N/A.

J-Rat -- what about a custom turbo?? How well will that do?? I am possibly going to be putting in a turbo into the na that I'm buying. You think that will be any good... explain?? and what would need to be replaced, removed etc... thanks!

I wouldn't say exhaust adds 60HP... Maybe with header, presilencer, replacement pipe and aftermarket exhaust you'd see a 40HP gain. Which is quite impressive anyway! I hope to be doing this over the summer. All I need is to find a crooked emissions inspector!

AHhh... I knew these guys are screwing with my head. Yeah, I thought so! So yeah I can believe that!

I wouldn't say exhaust adds 60HP... Maybe with header, presilencer, replacement pipe and aftermarket exhaust you'd see a 40HP gain. Which is quite impressive anyway! I hope to be doing this over the summer. All I need is to find a crooked emissions inspector!

if you put an intake and headers, downpipe, presilencer and full cat back with gutted cats you can get 30 if not a few more from a non-turbo I bet... I would not doubt getting around 60 with a turbo because air flow on a turbo is import and makes horsepower jump way up

if you want to be fast like 13's and want it to be reliable I'd say go for the non-turbo, but if you want 12's or lower get the TII cuz the non-turbo won't get you there, atleast none that I have heard of... that would be nice to see a non-turbo 2 rotor in the 12's :eek7:

J-Rat -- what about a custom turbo?? How well will that do?? I am possibly going to be putting in a turbo into the na that I'm buying. You think that will be any good... explain?? and what would need to be replaced, removed etc... thanks!


http://www.aaroncake.net/RX-7/naturbo.htm

Have fun! Thats a pain in the ass.

I really don't care about 1/4 mile anyway. However it is nice to have more power! :)

J-Rat -- Thanks for the link!!

MBTN -- True! I want to feel the torque and heard the swooosSh sound from the BOV in between shifts.

racing beat also has the Catalytic Converter Replacement Pipe with Presilencer that gains 26 HP on a turbo($245) and 18 on a non-turbo($290)

and you want proof rx-7's are fast?
http://files.automotiveforums.com/gallery/watermark.php?file=/503/67256238_4-med.jpg
how about that for proof?

heres a drag rx-7
http://www.rotormaster.com.au/dragcars_rx7series2.asp
I've never seen a hond run a 7.5 or even go 172mph


and heres a site some guy made about a $3,000 rx-7 with just exhaust, spring, and tires vs. his $20,000+ modded prelude on the track... he ends up getting an rx-7 not long after...


And yes your right the NA rx7 isn't that fast, but it is definately fast on the track, better lateral acceleration than almost any other car(besides the turbo model and the FD ofcourse) but I think getting the NA into 12's in the quarter mile is easily possible with a large budget... personally I just want to eventually get my car into low 13's as a non-turbo and reliable... and be set up for the track/drifting(with different tires on the back ofcourse)
but the non-turbo can get into the high 14's without a ton of money and still be very very reliable...

That's FAKE! The current land speed record is 648.7 MPH

That's FAKE! The current land speed record is 648.7 MPH

no its not fake, but no its not the land speed record ANYMORE, that poster is from 1986, I just posted it cuz it was an rx-7 that went 238mph... I have an option video with an FD going over 300mph(don't know exact speed cuz its shown in KPH and I don't know the convertion) but they did have it in 86, and in like 1978 they had set it in the first gen rx-7 at like 189mph, then broke it in 86 with the 238mph... man how times have changed haha

Straight from Racing Beats site 59HP on a TII:
http://www.racingbeat.com/FRmazda2.htm

http://www.racingbeat.com/photos/16425.jpg


Complete Exhaust System
1987-91 TURBO II

Part Number: 16425
Retail Price: $789.00
Qty:




1987-91 TURBO II Complete High Performance Exhaust System*

This is the ultimate exhaust for any Turbo II RX-7! Let your turbo breathe to it’s full potential with our “turbo-back” complete exhaust system.

The Turbo II High Performance Exhaust system incorporates a 3.15-inch (80mm) down pipe from the turbo outlet that mates to a presilencer section. From the head of the Y-pipe two 2.375-inch (60mm) pipes extend to the ceramic wool-packed 409-stainless steel rear main mufflers. The bolt-on exhaust system increases horsepower approximately 32% - a 59 HP increase on a 1987 Turbo II RX-7!

The Turbo II High Performance Exhaust system reduces exhaust gas back pressure significantly, thereby allowing the un-assisted turbo boost pressure to increase to 10-11 psi. Our Fuel Cut Controller (part No. 11570 or 11571) is required to prevent fuel cutoff to the rear rotor above the factory pre-set limit.

This bolt-on system uses the stock mounting points for ease of installation. Each system is supplied with all necessary mounting hardware and gaskets (does not include turbo outlet gasket). The down pipe section is provided with a position for the oxygen sensor.

We also offer individually the components comprising the Turbo II Complete High Performance Exhaust system for those individuals wishing to build custom exhaust systems for their specialized applications. (See the following items in the section menu.) Note: The components in this system are not interchangeable with any stock or other Racing Beat exhaust components.

*Legal in California only for racing vehicles which may never be used upon a highway.

I'd like to see the 300 mph video, the only top speed fd video i have is one where he hits 215kmph on the salt flats and proceeds to fly, literally up in the air he goes till he lands upside down facing the wrong way. Well maybe not flying, but that was one hell of a jump. :cwm27:

Yeah, I want the video toO!

That's FAKE! The current land speed record is 648.7 MPH


Of course you know that there are different classes in the Land Speed category, dont you? Racing Beat owned the land speed record in that category.

I'd like to see the 300 mph video, the only top speed fd video i have is one where he hits 215kmph on the salt flats and proceeds to fly, literally up in the air he goes till he lands upside down facing the wrong way. Well maybe not flying, but that was one hell of a jump. :cwm27:

so buy it, its the RX-7 Option video... its not an internet video, its an acctual tape, search google and you can probably find it.

OMG, That's friggin horrible. I thought it would be a monster since it's running on rotors. It only does 16.2 in a qtr mile, pushing 145hp? Wow, so are you telling me that my honda can beat an RX7 then (atleast a non-T). My single head honda all motor run's 15.1, no NOS, no turbo and no super. All I ever hear is rotary this, rotary that... it has persuaded me to go buy one, only to find out that my Honda with little work on it would probably kick half their a$$es. Somebody please re-confirm to me the number as I am trippin and buggin at the moment.
Rotary motors are notorious for making lots of power through boost but a stock non-turbo rotary only has 1.3 liters of displacement. The whole stupid saying of "No Replacement for Displacement" is true only when you're talking about N/A cars. Add forced induction and you can cram as much air into a 4 cylinder motor as a N/A V8 and make just as much if not more power. With out the turbo's forced induction though the rotary engine is pretty much a Weed Wacker motor. So...yes your honda probably could beat a N/A RX-7 but the more air/fuel you can feed a rotary the more power it will make to a higher degree than a piston engine would. Rotary motors breath better. If you took a rotary motor and a piston engine with the same HP and and increased the same amount of air/fuel going to both, the rotary would make more power. It's more efficient. Now...just because your car has more power dosn't mean that it's faster, power isn't every thing. What really matters is your power to weight ratio and gearing. I'd be willing to bet that the RX-7 is lighter than your honda. Driver skill also counts for a lot. Another thing is what kind of racing you are talking about. Suspension is a huge part in making a car go fast. Think about it...if your honda had 300HP but had cut springs, no shocks, and weighed 3,400lbs. and the RX-7 only had 175HP but had full race suspension and only weighed 2,500lbs. I promiss you the RX-7 would eat you for lunch on a road course.

I'll run my 91 rx-7 non-turbo against your honda in any road race you want, once my clutch is in ofcourse. but you pick the place and the time and I'll hand you your arse.

Rotary motors are notorious for making lots of power through boost but a stock non-turbo rotary only has 1.3 liters of displacement. The whole stupid saying of "No Replacement for Displacement" is true only when you're talking about N/A cars. Add forced induction and you can cram as much air into a 4 cylinder motor as a N/A V8 and make just as much if not more power. With out the turbo's forced induction though the rotary engine is pretty much a Weed Wacker motor. So...yes your honda probably could beat a N/A RX-7 but the more air/fuel you can feed a rotary the more power it will make to a higher degree than a piston engine would. Rotary motors breath better. If you took a rotary motor and a piston engine with the same HP and and increased the same amount of air/fuel going to both, the rotary would make more power. It's more efficient. Now...just because your car has more power dosn't mean that it's faster, power isn't every thing. What really matters is your power to weight ratio and gearing. I'd be willing to bet that the RX-7 is lighter than your honda. Driver skill also counts for a lot. Another thing is what kind of racing you are talking about. Suspension is a huge part in making a car go fast. Think about it...if your honda had 300HP but had cut springs, no shocks, and weighed 3,400lbs. and the RX-7 only had 175HP but had full race suspension and only weighed 2,500lbs. I promiss you the RX-7 would eat you for lunch on a road course.


AreaT51R --
HaHaHa... okay man! I have a question for you! So I am still getting the N/A motor from the guy I recently been bragging about the whole time. And the date to pick up the motor is official (Jan 25th). However, I have another question in mind. You stated that if I was to throw force induction into the motor I will be able to push as much air and power as a N/A V8?? So how confident are you about that statement? Have you known or seen anyone with that set up? Because I just found from some other guy on the net getting rid of a Twin Turbo setup. I was thinking about that but wasn't too sure about the possibilities. What can you tell me about puttin an 1994 RX7 TT onto an N/A?? What kind of problems might I encounter?? What must I need?

Oh yeah- and just exactly how much lbs should I be running on a stock N/A (with the possibility of a 3 inch cat-back system)?

Anyone with any info??? Thanks!!

first of all you don't want a 3 inch exhaust on a non-turbo car, its too big. second of all I hope you don't mean lbs as in psi or boost, because thats only on turbo cars...

Dude... that's what I meant.... If I was to do an N/A w/ custom Turbo (Possibly TT)!

Well i don't know where you guys got your info... but my 87 GTU gets 165 hp and 160 ft/lbs torque. This is without any mods and regular engine care.

Well i don't know where you guys got your info... but my 87 GTU gets 165 hp and 160 ft/lbs torque. This is without any mods and regular engine care.

so did you get some special single production version with extra hp and torque? because thats not the specs on a 87 GTU, my 91's specs aren't even that high, mine are 160hp and 140 torque... what did you use one of those little gadgets thats supposed to tell you your horsepower, 1/4, 0-60 and all that? those things are not at all accurate.

Again for your vewing pleasure...The factory ratings...

Enjoy!

86-88 NA = 146 HP @ 6500 RPM w/ 138 Ft/lb @ 3500 RPM
86-88 Turbo = 182 @ 6500 RPM w/ 183 Ft/lb @ 3500 RPM
89-91 NA = 160 HP @ 7000 RPM w/ 140 Ft/lb @ 4000 RPM
89-91 Turbo = 200-202 @ 6500 RPM w/ 196 Ft/lb @ 3500 RPM
Infini IV = 215 @ 6500 RPM w/ 206 Ft/lb @ 3500 RPM

i dyno tested my car because i wanted to see how many horses i had before mods and after i got done modding it. These are just my personal specs, and, as with most cars, the factory specs are a bit low just so the company doesn't over rate their car.

Maybe someone who owned it before you put on some performance parts then?

not its all stock

they must have gutted the cats atleast... I mean I could believe if it was like 5 hp and 5 torque higher but no as much as your claiming... sorry not buying it

Amazing what stories you hear out here on AF, huh??

If you want fast go for the turbo, if you want quick go for the NA, I probubly picked up 10hp when i replaced my cloged stock exhaust with a free flow custom set up. My NA is a blast through the corners, no lag, and a torque band as smooth as a baby's ass! But it tops out at around, roughly, 126ish mph.

ouch, my stock 91 NA tops at 130