From Renesis To 13B-Rew
10-09-2005, 07:36 PM
#77
Spinning Aint Winning
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I must say the LS-1 looks HUGE! In the RX-7 engine bay. It makes the car seem more like a "kit car" other than a normal production car that has been modfied. I did consider the LS-1 as a possible engine choice however I love the uniqueness of the rotary engine 
.
The car in the photos only weighs 2875lbs.
!!! & is a well known Viper killer here in Houston.
.The car in the photos only weighs 2875lbs.
!!! & is a well known Viper killer here in Houston.
10-10-2005, 01:50 PM
#79
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Reading this thread is tiring .
People will do engine swap. Whether we like it or not. So there is no point aruging. Yes the LS1 is ok engine . So is B18C Vtec . LS1 would not work out so great in the rx-8. the reason why the FD LS1 swap worked out so well cause it had extra weight . Turbo/s, intercooler with vaccum hoses/actuators from hell.
I would like the see the weight of the engine LS1 vs 13B/Renesis. just for a little comparision. I like the turbo as a substitute for capacity/displacement. But lately i am loving N/A tuning more and more. Was watching the N2 AE86 series on best motoring ..hehe.. :D 9000-10000rpm tuned race cars makes a noise so yummy.
People will do engine swap. Whether we like it or not. So there is no point aruging. Yes the LS1 is ok engine . So is B18C Vtec . LS1 would not work out so great in the rx-8. the reason why the FD LS1 swap worked out so well cause it had extra weight . Turbo/s, intercooler with vaccum hoses/actuators from hell.
I would like the see the weight of the engine LS1 vs 13B/Renesis. just for a little comparision. I like the turbo as a substitute for capacity/displacement. But lately i am loving N/A tuning more and more. Was watching the N2 AE86 series on best motoring ..hehe.. :D 9000-10000rpm tuned race cars makes a noise so yummy.
10-10-2005, 04:03 PM
#85
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LS1's can be made to be very powerful. If we're talking about 3 and 4 rotor engines, you gotta talk about what can be done with the LS engine series also. 4 rotors are pretty heavy, too.
10-10-2005, 05:55 PM
#86
Need'd a Turbo
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Thats true but if all you want is power then a 4 rotor is gonna give you 500hp+(i think its in the 600s) without FI. hell, a turbo 20b can make 900hp. so the weight is not really an issue except for affecting handling. I have nothing against the LS1 im just arguing for the rotor side :D. I guess the real obsticle is your bank account.
Last edited by mike1324a; 10-10-2005 at 06:07 PM.
10-10-2005, 07:14 PM
#87
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did anybody happen to see how small the 3 and 4 rotor custom 12a FD's were this weekend at seven stock? the 3 rotor was only 4 inches longer i think then the 13b. the weight balance and distrabution was unchanged in the 4 rotor 12a fd compared to the stock fd. i guess a 4 rotor motor with 12a parts was small enough to not effect the steering colume or firewall. the 3 rotor was putting out 650+ whp at low boost on pump gas! the 4 rotor was predicted to be at 850-950whp on pump gas with a 9500rpm redline!<----- and thats a safe tune!(at least thats what they told me) i think they were both using gt40r's.
denward
denward
10-11-2005, 04:44 AM
#88
Originally Posted by gh0st
ok... this is going no were quick. how on earth are you going to sit there and say that it is only an "assumption" that mazda designed the 13b-rew with intent to go FI??!
denward
denward
The fact that the Renesis engine is NA and higher compression isn't the issue. It's all in the tuning. Go search Crispeed over at the rx7 forum. Tuning higher compression rotarys to the tune of 500+ rwhp is his specialty. Now I don't feel the plastic stock intake is up to high boost stress to make that hp.
10-11-2005, 12:40 PM
#89
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Originally Posted by gh0st
did anybody happen to see how small the 3 and 4 rotor custom 12a FD's were this weekend at seven stock? the 3 rotor was only 4 inches longer i think then the 13b. the weight balance and distrabution was unchanged in the 4 rotor 12a fd compared to the stock fd. i guess a 4 rotor motor with 12a parts was small enough to not effect the steering colume or firewall. the 3 rotor was putting out 650+ whp at low boost on pump gas! the 4 rotor was predicted to be at 850-950whp on pump gas with a 9500rpm redline!<----- and thats a safe tune!(at least thats what they told me) i think they were both using gt40r's.
denward
denward
would've loved to see that in person. anyone take pictures?
10-11-2005, 02:34 PM
#90
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http://www.autotechmotorsports.com/index.htm
more info here. i wish i had taken pics but my camera was stolen the weekend before seven stock. i almost missed the booth and passed off the two 12a powered FDs as regular FDs because well, they didnt really look special. the motors were deep into the engine bay pretty much hidden, the engine bays were dirty and the owners were wearing tank tops, shorts, slippers and looked like they just woke up. kind of a phillipino fobish ghettoish sorta apeal. boy are looks are deceiving.
once i started talking to them, they seem to really know their stuff. they siad they had another car that had 2 12a's back to back merged by the ecentric shaft. not shure if it was a FD platform though. they also have plans to drop a 4 rotor 12a into a rx8
denward
more info here. i wish i had taken pics but my camera was stolen the weekend before seven stock. i almost missed the booth and passed off the two 12a powered FDs as regular FDs because well, they didnt really look special. the motors were deep into the engine bay pretty much hidden, the engine bays were dirty and the owners were wearing tank tops, shorts, slippers and looked like they just woke up. kind of a phillipino fobish ghettoish sorta apeal. boy are looks are deceiving.
once i started talking to them, they seem to really know their stuff. they siad they had another car that had 2 12a's back to back merged by the ecentric shaft. not shure if it was a FD platform though. they also have plans to drop a 4 rotor 12a into a rx8
denward
10-14-2005, 08:46 PM
#91
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The Renesis is at least 100 lbs lighter than an LS-1
I was confused by the claim the LS-1 is only 27 lbs heavier than the Renesis. I was doing a mental inventory of the steel an LS-1 would have and it seemed ther was no way.
Just look at the differences in the cranks... much less the fact that the LS-1 has 4 bolt mains...
Anyway I looked for some weights on the web (where else) and this is what I found:
LS-1 crate 390 lbs... no accessories.
13B racing (best I could find) 242 lbs.
3 rotor 319 lbs.
4 rotor 390 lbs.
BB chevy 684 lbs. (that explains why I was in better shape after the rebuild than before!)
I would say that if an LS-1 only added 27 lbs to a RX-7 then something else changed too...
The pages I found are:
http://www.sallee-chevrolet.com/fram...ckV8s/LS1.html
http://www.gomog.com/allmorgan/engineweights.html
Just so I don't get to roasted for jumping to conclusions.
Just look at the differences in the cranks... much less the fact that the LS-1 has 4 bolt mains...
Anyway I looked for some weights on the web (where else) and this is what I found:
LS-1 crate 390 lbs... no accessories.
13B racing (best I could find) 242 lbs.
3 rotor 319 lbs.
4 rotor 390 lbs.
BB chevy 684 lbs. (that explains why I was in better shape after the rebuild than before!)
I would say that if an LS-1 only added 27 lbs to a RX-7 then something else changed too...
The pages I found are:
http://www.sallee-chevrolet.com/fram...ckV8s/LS1.html
http://www.gomog.com/allmorgan/engineweights.html
Just so I don't get to roasted for jumping to conclusions.
10-14-2005, 09:11 PM
#92
Bummed, but bring on OU!
Originally Posted by jeffe19007
I was confused by the claim the LS-1 is only 27 lbs heavier than the Renesis.
10-16-2005, 06:36 PM
#93
Senor Carnegrande
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That page lists a couple of the 12A rotaries--with turbo--around 350 lbs. The FD had a 13b with two turbos, right? So the total weight is probably around 365...which would account for the small weight increase of a LS-1. To be fair, you'd have to add in the weight of a turbo kit to the Renesis.
(weight of a bare Renesis) + (turbo kit's weight) - (factory exhaust manifolds)
Whatever that number is would be the fairest comparison...of course the renesis is smaller/lighter than the 13b, so who knows...the LS-1 might add quite a bit more than just 27 lbs.
(weight of a bare Renesis) + (turbo kit's weight) - (factory exhaust manifolds)
Whatever that number is would be the fairest comparison...of course the renesis is smaller/lighter than the 13b, so who knows...the LS-1 might add quite a bit more than just 27 lbs.
10-16-2005, 07:43 PM
#94
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It's where the weight is in space that matters most. An LS1 distributes it's weight over a much larger area vertically and horizontally. Even if it weighed the same as a rotary, it would still be less balanced and will still adversely effect handling. I still say a supercharged 3 rotor in a C6 would be the coolest car ever.
10-17-2005, 06:34 PM
#95
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Originally Posted by rotarygod
It's where the weight is in space that matters most. An LS1 distributes it's weight over a much larger area vertically and horizontally. Even if it weighed the same as a rotary, it would still be less balanced and will still adversely effect handling. I still say a supercharged 3 rotor in a C6 would be the coolest car ever.
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