Yogartman

I have heard that you can swap the 13b for the 20b and get the car past 500hp. i have also heard that a 500hp RX7 would make an *** of a mclearin f1. Just wondering if these were true and where i could get a 20b?

Jason

iTrader: (5)

Yes we can do the 20B swap. Its best to give me a call as there are a bunch of options when doing that swap.

Jason

drodiablo

would a mazda b2300 engine fit in a 86 rx-7 and how would i go about that

Yogartman

What about the R26B that replaced the 13j, can those still be found, if they ever could be?

RobertC

iTrader: (1)

How much would a 20B engine swap usually cost? If anyone knows?

RiceFx306

iTrader: (7)

I think you should spend more time in the 3rd gen faq before you go about asking a billion questions. Some searching on the forums would yield many of your answers. As for a McLaren...there's more to a car than top speed.

bosscobra

iTrader: (1)

lol, wow i think reading this thread made me loose brain cells, if 500hp is your goal stick with a 13b, its not hard to get that with a good street port, fuel system and single turbo, 20b's get expensive, you can get 500hp out of them on lower boost then a 13b, but youll pay alot more for it, not sure what 20 b conversions jason offers, but definedautoworks seems to make a clean kit, hinson supercars makes a 20b subframe, and i think banzai racing might do one, all kinds of kits out there, do some research and i think youll jump right back to a 13b as soon as you see the cost. eh just my 2 cents

RobertC

iTrader: (1)

I did search a little bit for the cost of a 20B swap and even asked a few shops. But the shops I went to were very over priced. 24000 after paying 7000 dollars for engine and parts as they said..so that labor was just way too much. But I saw the pettit 20b swap for 35000. But they also would build it as they did it. I was just looking for the basic 20b swap since after looking I hadnt seen anything.

Jason

iTrader: (5)

We just finished a 20b swap. Labor is around $5k. The price of parts all depends on how crazy you want to go with it. Single turbo, fuel system etc..

Jason

David Hayes

iTrader: (6)

500+ on a three rotor with a single isn't a problem. I'm sitting at 520 RWHP at 14 lbs. of boost and this is with an ignition breakup issue. 575-600 at 16 lbs. is realistic with the right turbo and setup. And the extra torque at low RPMs will really make you smile.

What I'd like to add to the discussion, though, is it's going to cost way, way more than what you think to do the entire conversion. Plan on $30,000 and this is on the low side. Trust me - this comes from a person who has lived thru the ups and downs of the conversion.

Okay, so my 20B swap (https://www.rx7club.com/build-threads-292/kilo-racing-3-rotor-fd-conversion-325733/) hasn't exactly gone as planned or as I might expect a nromal one to go, but it will cost much more money to do the swap than what is being discussed. Just look at the simple things. The engine will cost $4,500 or so and then you have to have it rebuilt so throw in at minimum another $3,000 for this and that would be cheap. Oh, you want 3 mm seals and the engine bluprinted and balanced? That's extra. How about doweling? You get the point. How about the turbo kit for the 20B? Because you need a custom manifold, the kit will be at least $4,500 so we're now at $12,000 and counting. You'll also need the subframe and you'll need a new intercooler not to mention an ECU that will run the three rotor. Estimate these at a total of $5,000 and now you're at $17,000. How about the labor to put all these goodies into your car? Let's use Jason's estimate of $5,000 (which would be extremely low and a very good deal if they would do the entire conversion for you for this) and you are now at $22,000. Don't forget the fuel system which has to be completely reworked, the injectors and fuel rails, etc. and you can see how the bill quickly comes to above $25,000. Throw in all the other things you really need to do to get this right, including having an expert tune your car, and you're now easily at the $30,000 level.

It's a great conversion to contemplate from my perspective because of its uniqueness and HP potential but trust me, it's not a drop-in conversion and it will rapidly consume the contents of your wallet.

I'm not trying to dissuade you from going this route, but if money is a large factor, than stick with the 13B, add a nice big turbo and be happy. Or consider (god forbid) the evil LS1 conversion. It's much more simple and parts are plentiful.

Of course, this is just my .02 cents and three years of 20B conversion and money experience speaking

RobertC

iTrader: (1)

I personally love the rotary over piston which I beleive most would agree on this forum. But how do you like the 20b conversion after 2 years? Worth it to you? Not worth it, any difference in reliability over the 13b? You got yours done with Pettit right? How long did the conversion take? again how do you like it over the 13b? and would you go that route again afterwords? Back to reliability of the 3 rotor over the 2 rotor. Are there as many problems with the longevity of the engine? Or would you be looking at the same miles out of the engine?

T_Racer

iTrader: (1)

HAHAHAHA Well, when he finally takes posession of it again, he can then answer your questions. Read the thread and you will see the next big tv soap opera idea, "As the 20B E-shaft turns". LOL

Sorry, David, just had to throw that in. I have been watching your buildup for a year or so. I am in Brunswick, GA, just an hour north of you. We autocross with the Buccaneer Region out of Jacksonville, at Whitehouse airfield and at Renyolds Industrial Park. We have a A-prepared first gen. Would love to see your car, either out just watching, or running an event with us, dodging some cones.

Cheers,
Travis Nelson

David Hayes

iTrader: (6)

^Travis is right unfortunately. Read the thread and you'll learn that converting to a 20B isn't a turn-key event. That's why I encourage you to do your research and really understand what you are getting into.

Kevs

Any one know where I can get hold of a rear spoiler fitted to the 85 RX7, they are manufactured out of rubber.