Questions about Engine Mods
11-08-2011, 08:52 AM
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Questions about Engine Mods
Hey guys!
So I have been looking at making some engine performance mods. I know with standard piston engines you can bore out the cylinders and etc. But can you do anything like this with a Rotary? I haven't read anything regarding doing this on the internet and the more I think about it, it doesn't seem like it would be possible. Here is a list of Engine Mods and Parts I'm looking at, is there anything else that I should consider or would be strongly recommend/compliment the other mods when I have these mods installed.
- Greddy Turbo Kit ($5301)
- Greddy EVO-TT Catback ($1091)
- Okada Plasma Coils ($760)
- NGK Laser Iridium Spark Plugs
• Leading Plugs Sets of 2 ($48)
• Trailing Plugs Sets of 2 ($48)
- Greddy Pulley Kit ($243)
- Gates Racing Serpentine Belts
• Water Pump Belt ($29)
• AC Belt ($29)
TOTAL: $7549
I'm still looking at different suspension upgrades but I'm not sure whats good. Any advice would be appreciated.
So I have been looking at making some engine performance mods. I know with standard piston engines you can bore out the cylinders and etc. But can you do anything like this with a Rotary? I haven't read anything regarding doing this on the internet and the more I think about it, it doesn't seem like it would be possible. Here is a list of Engine Mods and Parts I'm looking at, is there anything else that I should consider or would be strongly recommend/compliment the other mods when I have these mods installed.
- Greddy Turbo Kit ($5301)
- Greddy EVO-TT Catback ($1091)
- Okada Plasma Coils ($760)
- NGK Laser Iridium Spark Plugs
• Leading Plugs Sets of 2 ($48)
• Trailing Plugs Sets of 2 ($48)
- Greddy Pulley Kit ($243)
- Gates Racing Serpentine Belts
• Water Pump Belt ($29)
• AC Belt ($29)
TOTAL: $7549
I'm still looking at different suspension upgrades but I'm not sure whats good. Any advice would be appreciated.
11-08-2011, 09:10 AM
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Well, at least you did a bit more research than the last guy, but I don't expect it will end any better...
...hmm, it appears he deleted the thread.
No, porting is the only option, and on the Renesis the porting options are incredibly limited. Low compression rotors are technically a possibility, but it's been proven that you can get more power with a low boost/high compression than a low compression/high boost, and it generates less issues and heat anyway.
Make sure you add an engine rebuild to the list if you modify the engine internals at all. You can't go part way with it, and to get a quality engine rebuild you are looking at $5k easily, many are $8k+ just for the engine rebuild + porting.
Also read through every greddy turbo build thread here, and you will see that the "kit" requires lots of modifications to work. It's NOT bolt on. Also add AccessPORT and tuning to your list.
...hmm, it appears he deleted the thread.
No, porting is the only option, and on the Renesis the porting options are incredibly limited. Low compression rotors are technically a possibility, but it's been proven that you can get more power with a low boost/high compression than a low compression/high boost, and it generates less issues and heat anyway.
Make sure you add an engine rebuild to the list if you modify the engine internals at all. You can't go part way with it, and to get a quality engine rebuild you are looking at $5k easily, many are $8k+ just for the engine rebuild + porting.
Also read through every greddy turbo build thread here, and you will see that the "kit" requires lots of modifications to work. It's NOT bolt on. Also add AccessPORT and tuning to your list.
11-08-2011, 09:57 AM
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Dump the evo tt catback, pulleys and okada coils. Add accessPORT and bhr ignition. A midpipe and a boost controller are a nice addition (if not a must). At least boost and afr gauges.
Okada coils are basically vamped up stock coils that love to fry.
If your engine is old and in poor general conditions keep in mind that it will blow off eventually.
Uneven seal wear causes blowback of the gasses, definitely not a funny thing when boosted.
Okada coils are basically vamped up stock coils that love to fry.
If your engine is old and in poor general conditions keep in mind that it will blow off eventually.
Uneven seal wear causes blowback of the gasses, definitely not a funny thing when boosted.
11-08-2011, 01:58 PM
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Ok so I will have to do some research on Porting then, Thank you for the information. RIWWP, what is a realistic amount of RWHP I can expect out of the Renesis Engine for $15k-20k. Also any advice on who I can trust to rebuild a rotary for me and for porting what kind of port would you recommend? Mild or Extended? And will porting decrease the life span of my engine? Also just to make sure I understand, are you suggesting Porting, engine rebuild, and forced induction system? or One or the other? (Porting or Engine rebuild and Forced induction)
I would NEVER slap on a forced induction system to a car without rebuilding the engine but I am still very new to this and just looking to collect information on who this community might suggest. I just want to make sure I have everything covered and researched before I wasted money. Thank you for your help and for my questions.
I would NEVER slap on a forced induction system to a car without rebuilding the engine but I am still very new to this and just looking to collect information on who this community might suggest. I just want to make sure I have everything covered and researched before I wasted money. Thank you for your help and for my questions.
Last edited by alaiaa01; 11-08-2011 at 02:06 PM.
11-08-2011, 02:08 PM
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It depends on what route you take.
I'm not qualified to give you a peak HP number based on pure dollar value. I know people that have thrown that much at an engine and ended up with minor gains, and I know people that have spent half that for ~325rwhp.
Cost is a BIG part of "doing it right", but "doing it right" has a BIG cost swing. For example, in numerous area's, "doing it right" is a cost savings, and "doing it wrong" is what increases the cost. "Doing it right" by itself increases the overall cost. For example you simply can't "do it right" for less $3,000.
For $15-20k though, if you are serious and you actually have that kind of cash budget, and power is your biggest concern, then you may want to consider doing a swap to an FD motor w/ turbo. There is a super clean swap on the boards with I think 400+rwhp, and his total price was around $15k (shop doing the work). $20k is low side of a doable 20b swap.
I'm not qualified to give you a peak HP number based on pure dollar value. I know people that have thrown that much at an engine and ended up with minor gains, and I know people that have spent half that for ~325rwhp.
Cost is a BIG part of "doing it right", but "doing it right" has a BIG cost swing. For example, in numerous area's, "doing it right" is a cost savings, and "doing it wrong" is what increases the cost. "Doing it right" by itself increases the overall cost. For example you simply can't "do it right" for less $3,000.
For $15-20k though, if you are serious and you actually have that kind of cash budget, and power is your biggest concern, then you may want to consider doing a swap to an FD motor w/ turbo. There is a super clean swap on the boards with I think 400+rwhp, and his total price was around $15k (shop doing the work). $20k is low side of a doable 20b swap.
Last edited by RIWWP; 11-08-2011 at 02:11 PM.
11-08-2011, 02:11 PM
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It depends on what route you take.
I'm not qualified to give you a peak HP number based on pure dollar value. I know people that have thrown that much at an engine and ended up with minor gains, and I know people that have spent half that for ~325rwhp.
Cost is a BIG part of "doing it right", but "doing it right" has a BIG cost swing.
For $15-20k though, if you are serious and you actually have that kind of cash budget, and power is your biggest concern, then you may want to consider doing a swap to an FD motor w/ turbo. There is a super clean swap on the boards with I think 400+rwhp, and his total price was around $15k (shop doing the work). $20k is low side of a doable 20b swap.
I'm not qualified to give you a peak HP number based on pure dollar value. I know people that have thrown that much at an engine and ended up with minor gains, and I know people that have spent half that for ~325rwhp.
Cost is a BIG part of "doing it right", but "doing it right" has a BIG cost swing.
For $15-20k though, if you are serious and you actually have that kind of cash budget, and power is your biggest concern, then you may want to consider doing a swap to an FD motor w/ turbo. There is a super clean swap on the boards with I think 400+rwhp, and his total price was around $15k (shop doing the work). $20k is low side of a doable 20b swap.
11-08-2011, 02:17 PM
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Also What is your opinion on Carbon fiber RIWWP? I know Fiberglass kits are a bitch to install? Are Carbon fiber kits any different? Looking around I have found the doors trunk, and hood in CF. But will it be just as much of a pain in the *** to install a carbon fiber doors, trunk, hood, and fenders as it would to do fiber glass?
11-08-2011, 02:22 PM
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Neither?
The RX-8's body parts are already VERY light. You will have to spend lots of cash for the actual true CF parts. Most CF body parts available for the 8 are actually just "carbon fiber wrapped", and not lighter than stock. If you are actually looking for performance gains from weight savings, head on over to the Racing subforum to find the weight savings possible. You won't find them swapping body panels.
The RX-8's body parts are already VERY light. You will have to spend lots of cash for the actual true CF parts. Most CF body parts available for the 8 are actually just "carbon fiber wrapped", and not lighter than stock. If you are actually looking for performance gains from weight savings, head on over to the Racing subforum to find the weight savings possible. You won't find them swapping body panels.
11-08-2011, 02:23 PM
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Neither?
The RX-8's body parts are already VERY light. You will have to spend lots of cash for the actual true CF parts. Most CF body parts available for the 8 are actually just "carbon fiber wrapped", and not lighter than stock. If you are actually looking for performance gains from weight savings, head on over to the Racing subforum to find the weight savings possible. You won't find them swapping body panels.
The RX-8's body parts are already VERY light. You will have to spend lots of cash for the actual true CF parts. Most CF body parts available for the 8 are actually just "carbon fiber wrapped", and not lighter than stock. If you are actually looking for performance gains from weight savings, head on over to the Racing subforum to find the weight savings possible. You won't find them swapping body panels.
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