Well here is the fastest 13B RX7 on gasoline. new 13b world record!!!

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a big congrats to Gaby and the crew from sporty motorsports in PR

they ran a 7.44@178mph today in PR

this makes them the faster 13b in the world!!!

the car weighs 1970lbs which is 70lbs over the weight limit
the car still runs on gasoline not methenol as well!
the cars runs a Microtech LTX12s ecu

the car has run a handfull of 7.5's this week proving they have a reliable package!


well done guys,

also big congrats to Jon from RX engineering here in Australia who has had a big hand in this car,
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I was just wondering why I should abandon the 13B when time and time again it proves itself very capable for any street car. I guess I wanna know who has the fastest V8 RX7? I see all these LS1 conversions and so on but I never see any time slips. I see these cars that had V8 swaps for sale a lot and people cant seem to get rid of em. If the V8 made the car so much better why all of sudden are they selling it..? Also if it is so great why are they not pulling in top dollar? I dunno I think the rotary is the perfect engine and if the 13B cannot give you what you want why not just do a 20B conversion. However the 13B is very capable for making a decently reliable 10 sec car. Some have even managed 9s and keeping decent reliability. All without piggin down on the cubes LOL.

 

 

Yes but have they been doing it in the body of a RX7? Also there is 6 second Rotarys with much smaller displacment, and they are catching up everyday. However the question was what is the FASTEST V8 RX7? That is the question, and mind you this is a 13B on gasoline we are not even talking 3 or 4 rotors yet. So what is the fastest V8 conversion RX7? I just wanna know. So I can see that it really is easier to run faster times with the V8 than my rotary. So once agian this is the RX7 club we are talking RX7s here. I know what V8s have been doing in the past I am now wanting to know what they are doing now in RX7s ok.

 

Most of the running v8 conversions are "mildly modified". Hinson's tt ls1 should run some good numbers on pump gas. Who is selling their converted car's?

Only in the rotary world would you call a "handful of passes" a reliable car.
If you want to race other people's cars on the intraweb, I have a friend who runs high 7's in his gas powered 2200 lb , big block race car(N/A, no nitrous). He has ran the car for 2 complete season's(~10 events /year)with nothing more than a valve spring swap-that's reliability.

What does your car run?

Didn't we almost have this forum shut down because of -------- like yourself, please go away. Wait until Jimlab see's this one!

 

Yes 7.44 is extremely fast, especially for what he has. But look at the weight. V8 powered platforms that are in excess of 3200+lbs are running in the 6s, and 5s. I have personally seen a few BB 2nd gens around Moroso and Gainsville. But you have to remember, not everyone is a "forum" poster. And to add, i dont believe that anyone who posts on here has a full tube chassis drag only setup that weighs 1900lbs, that has a team working on it through countless hours of R&D.

Take his chassis and put a fully built V8 in there , its not hard to see. Pure and simple, i LOVE the rotary, but, for drag racing and obtaining maximum power a piston engine has proven itself to be "CAPABLE" of making MORE power, MORE torque, MORE reliably......bottom line. I currently have a rotary and a conversion going on right now, love BOTH of them for the application that they are being built for. It all comes down to money in the end.......$= SPEED!

 

BTW- Gaby will be the one tuning the rotary we are building.

 

He just asked a simple question, I don't know what you're getting all upset about. He gave info of the fastest rotary with specs in case anyone was interested, then wanted to know what the fastest v8 RX was. What's so ignorant about that? It just seems like friendly conversation to me. No flamage of v8 RXs or anything.

 

Another good point, a 7 second v8 CAN be built and maintained by someone on a modest budget at home ,in the garage. The car I referenced in my last post was built by someone on a $50 k salary, in his garage( although the half tube chassis and cage were built by someone else).

 

Aparently you missed this entire paragraph on the bottom?-

"I was just wondering why I should abandon the 13B when time and time again it proves itself very capable for any street car. I guess I wanna know who has the fastest V8 RX7? I see all these LS1 conversions and so on but I never see any time slips. I see these cars that had V8 swaps for sale a lot and people cant seem to get rid of em. If the V8 made the car so much better why all of sudden are they selling it..? Also if it is so great why are they not pulling in top dollar? I dunno I think the rotary is the perfect engine and if the 13B cannot give you what you want why not just do a 20B conversion. However the 13B is very capable for making a decently reliable 10 sec car. Some have even managed 9s and keeping decent reliability. All without piggin down on the cubes LOL."

 

Ok my car has ran a 12.1 in the 1/4 with the mods in my sig. My motor is a Jspec. I see your in WI maybe you can beat me this year with your car we can meet in MN I hope to be touching high 11s. So we wont have to web race you and I can meet up for real. As far as Jimlab what is he gonna do about anything besides try and give me more negative reputation. He and I have already went aorund on this subject. It does not matter, I am no engineer I am Jarhead which is slang for a Marine. So what the hell do I gotta be worried about Jimlab for..?I dont know everything about cars but I know enough to know that I am not seeing these V8s out do the rotary in street applications. I have beat many of V8s as well as have been beaten. I just dont see the V8 being a huge advantage in anyway. The times are similar. By the time I buy a decent V8 with decent HP and swap it in I could have easily paid for all my mods that put me right at the same spot that the V8 would have. When I get the motor rebuilt I will get a street port and 3mm seals and run some of the bottle my self. Hopefully I can be looking at 10s then, maybe not. Either way when I show up at the track I know I have the smallest motor there and I know I am gonna be far from the slowest. I like the linear pull of the rotary its different from the conventional piston engine. Also I would like to say thanks Ejay as yes I did just wanna know the fastest V8 RX7. I also wanted to know why anyone should swap to a V8 if the rotary can do just as well especially in any street car. As far as maintaining the rotary I guess I never seen where it is that hard. You were talking tube chassis well there is a couple 20B RXs out there in the 6s. Given the size once again of a 20B and a Big Block I am impressed with the 20B. I am even more impressed with the Jesus Padilla and Ken Sheepers who have been running 9s in there 1st gens with N/A rotaries, now Ken is gonna be in RX8. Anyway once again comparing apples and oranges. The V8 has no real advantage over the rotary in street applications. Top Fuel yes then the V8 is better, but a good street car I have to disagree. Well now that I have got this section all flamed up I am outta here.

 

7.40 in a 13B? Not in a stock chassis. Gotta be full tube with a solid rear. IRS will not pull off a 7 second 1/4 mile.

Compare apples to apples here. Basically, you want to compare a full-on drag 13B powered tube chassis with a V8 RX-7 conversion. People who convert RX-7s aren't looking for ETs. It's the wrong chassis for that. Low ETs are a byproduct of doing the swap. People swap in the V8s for the following reasons: Reliability, fuel efficiency, power and torque, economical.

Now, minus the chassis, the RX-7 is a dated 80's sports car. It isn't spectacularly beautiful to begin with, but it does have nice lines. They look even sillier with 3.5" wide drag fronts and 18" slicks in the back. I can sympathize with anyone who has decided against doing a tube chassis RX-7 - there's a shell out there somewhere that looks better on fats and skinnies.

So, would you like to compare full tube chassis times for N/A V8s vs. full tube 13B cars? After it's been tubed the shell is only there for looks and aerodynamics.

 

A 1.2L rotary takes up the same amount of space as a 6L+ small block. Internal displacement is an elitest, *****, retarded and misleading arguement. Rotary nuts and those SOHC/DOHC Ford monkeys go crazy over this. A 4.6L DOHC without the blower is even bigger than a rotary!

Anyone who's been to a dragstrip knows a 1900lb car running mid-7's is slow. In fact, they have the same problem as stock RX7s - they're egregiously underpowered for the capability of the chassis.

Those V8 RX7 people are so stupid for spending all that time, talent, and resources on their conversions. I can't imagine why more and more people keep doing it.

 

Ok after reading LT1 10AEs post I have decided you guys are right. I am calling Grannys right now and I am dropping a V8 in. Thank You for your guidance, I have now seen the light. My car will never be competitive until I do the V8 conversion. Man if only I would have listened to you guys earlier. Well off to call Grannys and then Summit to see if I can order up a 400HP 400CI motor. It will only be about $4k for the motor and then whatever for the grannys kit. Thanks guys I will keep you updated on my V8 conversion. Oh ya I wanna Auto Tranny to where can I get that? Should I look for a JunkYard Jewel? Well I will figure it out.
Thank You
Jeremy

 

Your engine bay fits a small block better than a 4th gen F-body does. You better get over that idea.

So, usmcjsy, you haven't done the swap. You think it's a bad idea.

LT1-10AE, and turbogarrett have done the swap. I know you're not an engineer and can't explain why more rotaries aren't in cars, but maybe you can read between posts and see what they think about it?

And your RX7's transmission is just an accident away from being a junkyard jewel. Another elitest arguement.

 

Hehe, I didn't mean to pee in your cornflakes there. Here's some numbers (for those interested) on my swap:

$2500 LT1/T56/ECU/Harness
$1100 LE1 heads and cam (370-390 to the wheels)
$459 Coldfusion N2O wet kit (50-200HP)

So for the $4k you spend on a crate motor I can have a high 300HP (high 500s when sprayed) powerplant and have a six speed and EFI to go along with it. Oh... and A/C and cruise control kickin' on the way back from a (possible if it will hook) 10.0xx pass at the quarter mile.