rx-7 crazy

does any one know how much hp you'd have with a big street port?

Directfreak

iTrader: (2)

You need to post more info..

what engine? 12A? 13B? 20B? 10A? 26B?
4 port??
6port?
what carb?
what EFI?
Which headers?
Which exhaust system?

and so on...

Just trying to narrow the question down.

peejay

Anywhere between 100hp and 230-240hp.

rx-7 crazy

13b / 6 port w/ racing sleaves (pineapple racing)
stock fuel system 84 gsl-se racing beat exaust(ported)

peejay

No more than 200hp... the fuel injectors will be working overtime after 197hp by my calculations

Directfreak

iTrader: (2)

That's the EXACT same setup as my old SE

differences were: No pineapple racing sleeves (didn't exist)
MSD Ignition (I had one)
Cone Air Intake.

It would run Mid 14's all day with me, Subwoofers, gas,etc.

Horespower was about 215 according to my mechanic, No dyno's that I knew about then.

BadAssRX-7

my old setup...streetported 12a and WELL TUNED dellorto did 165 on the ground dam i miss that

abeomid

mechanic told me with good exhaust you can get up to 220HP

BlackDragon

13b on an 89 T2. Rebuilt with 30k miles and 3mm apex seals (I'm assuming to counter the wear on the block). Stock exhaust for now. What would that be?

Then what would it be with a DP, Catback, and intake? (can't get a MP because I'm in CA). Just curious...

rx-7 crazy

pineapple racing said that their sleeves were good for 6-8 HP. is that 215 at the wheels or tires???

Directfreak

iTrader: (2)

Judging by my old 1/4 mile times, and the nasty acceleration, I would say to the rear wheels.

Back then I would eat stock TII's for lunch, as well as many other so called "fast" cars.

peejay

What kind of times?

I'm just curious, because the stock fuel injectors will not support that much power...

Directfreak

iTrader: (2)

Peejay, remember the 84's had 680's or sumthin' like that. The 85's had the 720's. I had 720's from my previous 85 engine, in my Streeported 84 SE. The injectors were almost new, because I got them even earlier, when I put the 85 SE engine in my 81 GSL (1988?89?). Since I went Dellorto on the 81 back then, I just kept the injectors for the future, and used them when I streetported the 84 SE.

As it is, it always ran rich, and would foul plugs quickly, and stank like gas.. (gotta love it)

Those injectors where very highly sought after back then. They put out alot of flow..

peejay

Figuring .65lb/hr/HP BSFC (common rotary figure), and two 65lb/hr (720cc/min) injectors, that's a maximum of 200hp with the injectors slammed wide open. Either you were running lean (making BSFC go down) or your injectors were bigger than spec or you weren't making over 200hp.

Still plenty of power for the weight

BlackDragon

How did you do those calculations again? I'm interested in a more detailed version of the formula you're using...

(Not a flame, I'm curious)

peejay

Here's a link... if I try to explain it I'd just be reinventing the wheel

http://www.sdsefi.com/techffhp.htm - Simple chart of how much HP a given set of injectors will flow. I was wrong in my calculations BTW - 720cc/min is more like 69lb/hr. The injectors can each supply 69 pounds of fuel per hour, and there are two of them, so that's 138lb/hr total. A street ported rotary iwll require about .65 pounds of fuel for each HP over an hour, or .65lb/HP/hr. Divide 138lb/hr by .65lb/HP/hr and you get 212.3hp, which of course is at max duty cycle. At 85% duty cycle, that's 180hp. Again, that's still plenty of power to move a little car around.

More formulae: http://www.sdsefi.com/techform.htm

BadAssRX-7

a friends 87t2 with street port and lots of other **** did 345 on the ground TO4 fmic 1100cc infectors blah blah blah it was ULGY and fast and UGLY FAST

rx-7 crazy

my buddy bet me $200 that his 88' crx would beat my 7. he dynoed 200 at the wheels do you think i would win. i can afford to lose but i didn't agree yet cuz i wasn't sure if it would be a fair fight but i think i might have an advantage. also he said we could race from the line or a rolling start (60mph). the 60 would give me the edge cuz i get more power in higher rpm's right???

yes i know a 88 crx w/ 200rwhp sounds untrue but hes going to bring me his dyno slip and if he cant find it i said i'd split the cost to get it dynoed again if he was right and he agreed

Jerm982

If the GSL-SE 13B injectors limit you to about 200hp can't you just get higher flowing injectors?

BlackDragon

Sounds to me like you're going to get your *** beat. You may have horsepower that is near to or equal to his. But I'll bet you his car weighs several hundred pounds less. (stripped huh...) so I'd say he's going to waste you...

Just my guesstimation. I don't have anything to compare your car to so I don't know for sure. But a crx with 200 FWHP (not rwhp) is quite quick. Especially considering the T2 I'm getting won't have that AND I'll be weighing much more than your friend.

mperformance

rx-7 crazy...

Dude don't do it. You'll lose and next thing you know you'll be doing a full T2 swap....selling your house, losing your Girlfriend and ditching your dog. Trust me it happens.

rx-7 crazy

lol you guys trip me out all you had to say was that i was going to lose you didn't have to put all that getting my *** wipped stuff in there. i wont race him for money if he really has that much hp, i still want to see a dyno slip cuz i dont think he has that much. and even if i did lose i don't have a dog and were both dating the same chick neither that seriously. any ways ****, thats to bad cuz i REALLY wanted to put him in his place we'll untill i get my T2 swap i guess i'll keep my mouth shut. thanks for saving me $200

BlackDragon

lol, no hard feelins bout the *** whippin thing I was just tryin to stress the point that you should definitely NOT race the guy with that much HP. Let us know if he dynos less. Then you might have a chance

rx-7 crazy

just curious what ignition system did/do you have?