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Thread: street or bridge
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rotormunky
Redlining
Orlando, Florida
Posts: 424
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posted January 19, 2004 05:59 PM |
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It probably would make a decent engine, my point was just that it would likely take more money and time/labour to get one into a REPU than a TII and you'd be making less HP and torque. The REPU's gearing makes up a bit for the lack of torque but if I were to do any heavy hauling on a very regular basis I'd want a bit of torque, that's all.
The IDEAL situation is a solid and reliable forced induction setup on a renesis that keeps things as simple as possible. For now tho I think a TII setup would be easier, cheaper and with better power.
Can't wait until that's no longer the case.
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-Martin
Orlando, Florida
http://www.themonkeyhouse.org/REPU
'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)
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Jeff20B
Moderator
Posts: 661
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posted January 20, 2004 02:03 AM |
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Klaus, you're getting it. :)
As for the Renesis in a REPU, the T2 would obviously be easier to install due to the ease of swapping the front cover for a '74-'85 one. The Renesis has an as-of-yet unknown front cover bolt pattern and some new-fangled motor mount setup that fits the RX-8 specifically. I think we all know Mazda tends to make things backwards compatible for a little while after they make a major change in something (S4 to S5 parts swapability is a perfect example), but the Renesis is simply just so very different in so many ways. Even the alternator is mounted in the '73 and older direction.
Anyway, taking the stock REPU engine's torque and comparing it to the Renesis' output, I'd gladly install a Renesis in my truck if I had the chance. Otherwise, a T2 engine will go in simply due to this swap's simplicity (relatively speaking of course).
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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rotarydave
Hauling
Posts: 108
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posted January 20, 2004 05:54 AM |
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I know for myself and towing in a repu i am going to use a s/c not a turbo, I plan on starting with the 86block and internals. My whole premise is based on talking with Atkins Rotary and the numbers that they got during dyno work in CA with the stock 6port and a 5inch blower using a drawthrough marine 390 i can't quote the figures but what got me was the torque at lower rpm, i won't have to wind it up to high rpm to get the job done.
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rotormunky
Redlining
Orlando, Florida
Posts: 424
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posted January 20, 2004 06:27 AM |
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Yeah I like the more linear torque curve of SC configurations too. If there was a FI application I'd be all over it. I'd like to see what fuel economy figures look like on a SC configuration pushing ~250hp/~200-250ftlbs.
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-Martin
Orlando, Florida
http://www.themonkeyhouse.org/REPU
'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)
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rotarydave
Hauling
Posts: 108
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posted January 21, 2004 08:02 AM |
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I will see what i can do about gettting him to post some of those numbers, sometimes getting information from him is really hard, but maybee i can talk him out of it. FYI if I have not said it before i have a special relationship with those guys, he is ex-military from a medical field, i am military from a medical field, they helped with my wedding a few years back and whenever i am stationed in WA they I am their long-lost adopted son. Maybe i can get some of the info you guys are seeking and also be a conduit of information going both ways.
What do i know right now. Well Dave Atkins is a perfectionist he is not happy with the original design of the s/c it works and does what it is supposed to he thinks with the proper R&D it can be better. Please remember the s/c was originally designed by someone with no working knowledge of the rotary engine. Also if you have worked with Camden in the past (more than say 5 years ago) you will understand why Atkins now owns it, he got tired of the BS dealing with the old company so he found some financing and bought it.... I know they went way out on a limb to make this happen because they thought it was a good product that only needed some help. What are they working on, well several things are in the works all I can say without getting in trouble is FI is coming it won't be cheap because you will need a fuel managment controller, but they are looking for more power we are talking over 300 horses, also they are in developement of a bolt on kit for 2nd gen rx7s that holds some real promise i do not know much more than that at this time. but will let you know what i can when i can.
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rotormunky
Redlining
Orlando, Florida
Posts: 424
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posted January 21, 2004 09:17 AM |
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Well hot damn rotarydave, that'd me great, thanks.
My interest in FI is for tunability reasons. Properly tuned turbo configurations commonly get better mileage than N/A configurations using a proper standalone control unit.
If Atkins can provide a similar option in a supercharger I'd be very interested. It would allow me to save the expense of buying a new motor, plus I wouldn't be 'wasting' the original 4port in my REPU. While I'd like to see 250/250 for my REPU I'm not willing to endure 10 mpg to do it. As of yet I haven't seen any dyno charts of SC configs or heard from anyone re: the mileage they've managed to get. Tho I get the feeling Holleys aren't the fine instrument of tunability that four injectors would be.
I feel like the most cost effective option to get that sort of power without dipping below 15 mpg is going to be a 13bt with programmable fuel control even if the torque curve doesn't look as good as it could.
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-Martin
Orlando, Florida
http://www.themonkeyhouse.org/REPU
'77 REPU (Some assembly required :)
'91 Cabrio (Battered and bruised, but she's still my baby.)
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brad
Rotorhead
Posts: 1672
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posted January 21, 2004 01:39 PM |
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rotormonkey, go to rx7club.com
and search the 1st gen forum on superchargers. some guys have them and posted numbers.
supercharger vs turbo has been discusses a lot on that forum and general consensus was that supercharger puts unwanted stress on engine front bearings because it's running off the front pulley. also has parasitic loss. almost everyone on that 1st gen forum preferred turbo; free horsepower.
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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Jeff20B
Moderator
Posts: 661
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posted January 22, 2004 02:53 AM |
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That's only the surface of the SC vs TC debate.
I appreciate what Dave is doing. Please let him know that we look forward to his ideas taking shape.
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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brad
Rotorhead
Posts: 1672
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posted January 28, 2004 02:24 PM |
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so which is it Jeff?
Street or bridgeport? And when will it be ready?
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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Jeff20B
Moderator
Posts: 661
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posted January 29, 2004 02:31 PM |
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I'm still debating.
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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Jeff20B
Moderator
Posts: 661
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posted February 05, 2004 01:52 PM |
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Still dabating, although I am starting to lean toward the half bridge a little.
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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midnightriders
1st Gear
Posts: 16
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posted April 20, 2010 09:21 PM |
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Renesis port..
btw, the thing that makes a renesis unique is the use of an exhaust port in the plate instead of the housing...
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'74 white RePu
rb26 awd 240sx (yea i know)
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blwfly
1st Gear
Posts: 33
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posted April 21, 2010 09:42 PM |
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search on you tube there's a Mexican who bridge ported the intake ports on his renisis and a decent turbo..
so how bout a full bp renisis repu lol
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74 repu getting a s4 t2
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Micah
Hauling
Posts: 167
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posted April 30, 2010 04:22 PM |
 Edited By: Micah on 30 Apr 2010 16:47 |
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420 whp, No porting at all, 17 pounds of boost,,meth injection,,,nice and safe,,,no timing advancement. So I don't get that lag from porting or bad gas mileage.(Not that I bought a rotary thinking about saving gas lol) I can make more but why? truck is not for strip and the truck can barely take that power without more mods,,,,I had a bridgeport,,Im not even gonna comment on that. Good parts,,,,good tuning.....and a 72mm wheel on a turbo works nicely! And the pull is scary,,,yes I can make more power,,,but whY? daily driver,,,,,,my new 82 starlet,,,,new project now,,,, Good luck on what ever you choose to do,,,nice to see peeps talking about the repu and any shape or form,,,I hated seeing peeps faces when I said i was interested in turboing the truck,,,like it was a waste of time,,,motivated the hell out of me
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Micah
Hauling
Posts: 167
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posted April 30, 2010 05:18 PM |
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Oh!
I did'nt mean any of the faces on this site btw LOL,,,,,,,and if I was gonna go non turbo... street port would be it for me,,,,,
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