20B Swap into 2ndgen
06-17-07, 12:20 AM
#1
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20B Swap into 2ndgen
I want to swap my 13b N/A engine for a 20B Twin Turbo engine, I have someone willing to do the swap, I was just looking for someone to give me some info on the swap in general or anyone with the engine or parts I can buy. I need to know what parts I would need to swap out, What problems I should look out for, and any other info on the swap in general. Any Ideas or criticism are welcome. Also, if you happen to have the engine/parts for sale, or know anyone with them, let me know. I have a bit of change to play with so if a good deal comes along ill look it over. Thank you. Oh by the way I forgot to mention I have a 1988 RX-7 FC GXL
06-17-07, 01:57 AM
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I'm concerned that your fabricator has no clue about this engine conversion. It would be like your doctor asking you to survey opinions on internet forums so you can tell him what medicine to prescribe.... not good. I certainly hope you aren't going to Hector for the work.
As mentioned earlier, you will probably want to use a TurboII car rather than your current RX-7. An even better idea is to buy a completed 20B RX-7 and let the previous owner take the brunt of the massive financial hit and down time.
As mentioned earlier, you will probably want to use a TurboII car rather than your current RX-7. An even better idea is to buy a completed 20B RX-7 and let the previous owner take the brunt of the massive financial hit and down time.
06-17-07, 11:15 AM
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Well
I would like to just straight up buy a 20b rx7 fc, but thats pretty hard to come buy. I understand I would basically need a whole new car and are willing to buy all the parts but they are hard to come by. Also I was just planning on re-enforceing the body, think that would work? I understand that the engine is way to powerfull for the current body so I was going to make it stronger and get a solid diff and stuff like that to help support it. Any more detailed reasons against this swap? Anyone know someone who has done it?
06-17-07, 12:34 PM
#7
if you can do all the work yourself there are about 15000 reason not to do it.
and if you have to pay someone else there are 35000 + reason not to do it.
if you have the money then its up to you, but i suggest that you find someone
who has done this install before, to do it for you.
matt
and if you have to pay someone else there are 35000 + reason not to do it.
if you have the money then its up to you, but i suggest that you find someone
who has done this install before, to do it for you.
matt
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06-17-07, 09:59 PM
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https://www.rx7club.com/showthread.php?t=620860
https://www.rx7club.com/showthread.php?t=585381
The body has nothing to do with it.
That just got me as i scrolled down.
06-19-07, 12:23 PM
#12
Man. Seriously. This stuff has been covered 100's of times on this forum.
The 20b (3rotor) swap is not particularly cheap in anycar, ESP one that was NA from the factory. You do realize that a 20b motor by itself is nearly $4k, and that is bone stock, making not much more power than a mildly modifed single turbo 13b. Then you have to deal with cooling, mounting, drivetrain and that's the easy stuff. What about an ECU and getting it tunned/running? You can spend several thousand on those two alone as well.
The 13bTT from and FD? Again, the swap is a PITA, and there is NO benefit to do that over just putting in a single turbo 13b. Most people with modified FD's want to get RID of the TT system because it it just so complicated. It CAN be made to work, but why?
If you want turbo power, buy a turbo car and go from there. And please god be carefull withyourself. People spout numbers on this forum all the time, but do NOT underestimate a 300RWHP rx7. <- that's nothing to sneeze at.
Honestly, having driven and owned a 470RWHP car I can say that it takes, time, patience and money to do it right and truthfully, you just can't use that sort of power on the street.... no matter what anyone tells you.
The 20b (3rotor) swap is not particularly cheap in anycar, ESP one that was NA from the factory. You do realize that a 20b motor by itself is nearly $4k, and that is bone stock, making not much more power than a mildly modifed single turbo 13b. Then you have to deal with cooling, mounting, drivetrain and that's the easy stuff. What about an ECU and getting it tunned/running? You can spend several thousand on those two alone as well.
The 13bTT from and FD? Again, the swap is a PITA, and there is NO benefit to do that over just putting in a single turbo 13b. Most people with modified FD's want to get RID of the TT system because it it just so complicated. It CAN be made to work, but why?
If you want turbo power, buy a turbo car and go from there. And please god be carefull withyourself. People spout numbers on this forum all the time, but do NOT underestimate a 300RWHP rx7. <- that's nothing to sneeze at.
Honestly, having driven and owned a 470RWHP car I can say that it takes, time, patience and money to do it right and truthfully, you just can't use that sort of power on the street.... no matter what anyone tells you.
06-19-07, 02:49 PM
#13
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I'll save you the pain. Click on this link below and 90% of your questions will be answered:
http://fc3spro.com/TECH/SWAP/COSMO/20b.html
FYI I was also starting from an NA car and managed to acquire all the relevant T2 components (trans, diff, halfshafts, and driveshaft) in good condition for under $400.
http://fc3spro.com/TECH/SWAP/COSMO/20b.html
FYI I was also starting from an NA car and managed to acquire all the relevant T2 components (trans, diff, halfshafts, and driveshaft) in good condition for under $400.
Last edited by thetech; 06-19-07 at 03:07 PM.
06-19-07, 11:17 PM
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NO! Just stick with the good old 13BT if you don't have the time and/or money for the 20B-REW. Actually, a well-built NA engine can be pretty fun unless you are one of those boost-happy drag race types.
Send me PM if you would like performance shop recommendations. I lived in the Tampa area on and off for 20 years.
The pristine color-matched TII hood set me back another $450. Additionally, you need to figure in the amount of money from the sale of your original NA, which would have been a significant amount in my case. Compare all that with the cost of simply buying a good TII with a blown engine, and it is not worth it unless the NA car has a lot of modifications that would not resell well.
Send me PM if you would like performance shop recommendations. I lived in the Tampa area on and off for 20 years.
The pristine color-matched TII hood set me back another $450. Additionally, you need to figure in the amount of money from the sale of your original NA, which would have been a significant amount in my case. Compare all that with the cost of simply buying a good TII with a blown engine, and it is not worth it unless the NA car has a lot of modifications that would not resell well.
06-19-07, 11:54 PM
#15
just to give you a decent baseline idea of what you are considering:
i bought my TII for 600 bucks with a blown engine
20b was 3500
ecu 1300
turbo 1200 and thats less than half msrp
radiator 250
IC 100
fuel setup 400
clutch and flywheel- 600
and that includes me doing ALL the installation and fabrication work. if you cant do that, it is at least another 5k, probably twice that.
If your wallet can handle it, do some reasearch and go for it. If not, forget it, Ive been broke for years because of this damn car.
i bought my TII for 600 bucks with a blown engine
20b was 3500
ecu 1300
turbo 1200 and thats less than half msrp
radiator 250
IC 100
fuel setup 400
clutch and flywheel- 600
and that includes me doing ALL the installation and fabrication work. if you cant do that, it is at least another 5k, probably twice that.
If your wallet can handle it, do some reasearch and go for it. If not, forget it, Ive been broke for years because of this damn car.
06-20-07, 12:08 PM
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Thanks
Thanks everyone for your input, ive decided to go with the 13bt swap and then after finishing my car I will save up and begin the 20b project in the next few years, because yea I knew it would cost alot, but not 15k alot 
But yea, ive already ordered the parts required for the 13bt swap and will probly get it done in the next month. Ill post some **** up eventually. Thanks again.
But yea, ive already ordered the parts required for the 13bt swap and will probly get it done in the next month. Ill post some **** up eventually. Thanks again.
