Renny a weak engine???
09-14-2007, 04:50 PM
#31
I've seen this mentioned before and have to ask how dose the ignition hold the power back. How does the FI cause the current spark to be insufficient?
It's similar to the rest, but you have to keep in mind it's newer, the ignition system is currently what's holding us back, and the fact that it has higher compression rotors. Those things aside, the renesis is as strong, if not stronger than the previous engines.
Also, comparing a 2 rotor engine to a 20B is stupid when asking why one makes more power than the other
Also, comparing a 2 rotor engine to a 20B is stupid when asking why one makes more power than the other
09-14-2007, 04:53 PM
#32
Mazsport appears to have an upgrade solution around the corner. If they post some dyno charts of their kit above 330 whp, their ignition upgrade will become one of the bigger TODO items for anyone FI.
09-14-2007, 09:40 PM
#33
RX-8 = Japanese MG
Join Date: Dec 2006
Location: Bay area, CA
Posts: 307
Likes: 0
Received 0 Likes
on
0 Posts
check the dyno comparison thread. You'll notice all the high end kits max out around 330 whp. The stock ignition system can't handle anything higher.
Mazsport appears to have an upgrade solution around the corner. If they post some dyno charts of their kit above 330 whp, their ignition upgrade will become one of the bigger TODO items for anyone FI.
Mazsport appears to have an upgrade solution around the corner. If they post some dyno charts of their kit above 330 whp, their ignition upgrade will become one of the bigger TODO items for anyone FI.
09-14-2007, 09:53 PM
#34
09-14-2007, 11:14 PM
#35
Registered User
Thread Starter
Join Date: Mar 2007
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
this is another beef i have about these aftermarket companies. every good product for the RX8 seems to be "around the corner". ignition, around the corner. cobb programmer, around the corner. supercharger kits, around the corner for like 2 years (and yes i know its available now). flawless greddy turbo kit, AROUND THE FREAKIN CORNER!!!!! No offense intended to you mysql101.
Another question i have is this. I have heard that all the turbos that are available in kits for the 8 right now cannot provide sufficient airflow to feed the renny at high rpms. this in turn gives plenty of increase over stock in the lower revs, but not much up high. is this true?
Another question i have is this. I have heard that all the turbos that are available in kits for the 8 right now cannot provide sufficient airflow to feed the renny at high rpms. this in turn gives plenty of increase over stock in the lower revs, but not much up high. is this true?
09-14-2007, 11:28 PM
#36
Another question i have is this. I have heard that all the turbos that are available in kits for the 8 right now cannot provide sufficient airflow to feed the renny at high rpms. this in turn gives plenty of increase over stock in the lower revs, but not much up high. is this true?
The greddy is the smallest turbo for the RX-8. I think it's the only undersized turbo too. Now, before we jump on greddy's back for supplying us with a small turbo, keep in mind the greddy kit is setup for 6 psi. It does 6 psi all the way to redline too. So it's actually perfectly sized for the application.
What we end up doing is raising the boost. It can't flow enough air to maintain 12 psi at redline, thus the boost decreases....
here's a really nice greddy dyno sheet that shows PSI (on the bottom):
He's making almost 300 whp, and 250 lb-ft of torque. Even when the boost dies down, he's making 270 whp range. Compare that to a stock RX-8 that puts down 180 whp and 140 lb-ft torque. Doesn't sound so bad, does it?
09-15-2007, 09:57 PM
#37
Registered User
Thread Starter
Join Date: Mar 2007
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
no, not that you put it that way. it always kinda pissed me off, thinking that the turbo/sc kits didnt provide much improvement for the money and risk. but i never really thought about it in terms of whp and bhp. i dont know why it didnt hit me before. this is really beginning to sway my decision to wait for the turbo. im looking for a good ecu right now. lotsa people seem to like the e-manage ultimate, i might do some research in that forum. is there any other turbo kits worth taking a look at? im not too keen on a supercharger, but is there a "better" turbo kit out there than the greddyi should be looking at?
09-15-2007, 10:07 PM
#38
No means yes
iTrader: (1)
Join Date: Nov 2006
Location: Jersey City NJ
Posts: 1,507
Likes: 0
Received 0 Likes
on
0 Posts
Having seen (and heard!) the Pettit SC in person, I would advise you to not discount it out-of-hand. At least watch a vid, but the best is to hear it in person. Incredible!
As far as turbo kits go, it seems that the Greddy is the cheapest, but also the lowest power gain. Mazsport offers some great kits. Check out the thread in the Major HP forum with price comparisons and dyno graphs.
Also, if you are interested primarily in drag racing, nitrous is a good option. Gives you great WOT performance, and doesn't kick in during daily driving. A 55 wet shot does not require an ECU and Zex sells a system for about 600 bucks with almost everything you need. If you want to go down this path search for posts by "Charles R. Hill".
Happy hunting!
As far as turbo kits go, it seems that the Greddy is the cheapest, but also the lowest power gain. Mazsport offers some great kits. Check out the thread in the Major HP forum with price comparisons and dyno graphs.
Also, if you are interested primarily in drag racing, nitrous is a good option. Gives you great WOT performance, and doesn't kick in during daily driving. A 55 wet shot does not require an ECU and Zex sells a system for about 600 bucks with almost everything you need. If you want to go down this path search for posts by "Charles R. Hill".
Happy hunting!
09-15-2007, 10:31 PM
#39
mysql, is that dyno posted an rx8 with a greddy kit? 293whp compaired to 325whp. 30whp difference doesnt warrant a doubling in price. if the greddy kit can put down close to 300whp for its cost, that sounds pretty attractive. i thought it did something like 250-260whp.
09-15-2007, 10:35 PM
#40
yeah, that's the greddy. it does do about 240-250 at the stock settings (6 psi). But if you buy a $200-300 boost controller, you can adjust the boost. The graph above is at 10 psi. You should expect somewhere around 270 whp with it.
09-15-2007, 10:40 PM
#41
No means yes
iTrader: (1)
Join Date: Nov 2006
Location: Jersey City NJ
Posts: 1,507
Likes: 0
Received 0 Likes
on
0 Posts
Some of the kits are pushing very close to 400whp, but yes the law of diminishing returns applies. Also, it seems that some of the kits are still priced as if they're the only thing on the market.
You gotta decide if money or power is more important, then pick a hard number in that category and choose a kit accordingly. Don't forget that there will be hidden costs (labor, extra parts, "extra" things like gauges, etc.)
Also, if you aren't dying to go FI this very instant, things will probably go down in price in the next year or two as the market matures a little. A used kit might also be a good deal.
You gotta decide if money or power is more important, then pick a hard number in that category and choose a kit accordingly. Don't forget that there will be hidden costs (labor, extra parts, "extra" things like gauges, etc.)
Also, if you aren't dying to go FI this very instant, things will probably go down in price in the next year or two as the market matures a little. A used kit might also be a good deal.
09-15-2007, 11:25 PM
#42
Registered User
Thread Starter
Join Date: Mar 2007
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Also, if you are interested primarily in drag racing, nitrous is a good option. Gives you great WOT performance, and doesn't kick in during daily driving. A 55 wet shot does not require an ECU and Zex sells a system for about 600 bucks with almost everything you need. If you want to go down this path search for posts by "Charles R. Hill".
Happy hunting!
Happy hunting!
and as far as the labor costs CnnmnSchnpps, i made my mid up a while ago that i wouldnt do anyhting to a vehicle that i cant do myself (with the exception of sterio equipment). I am very proficient with tools and am right at home under a car on jack-stands. the nitrous kit was a breeze to install. it took me a while, (8-10 hrs) but i dont kike to rush things. I would absolutely love the chance to install a turbo kit.
09-15-2007, 11:35 PM
#43
No means yes
iTrader: (1)
Join Date: Nov 2006
Location: Jersey City NJ
Posts: 1,507
Likes: 0
Received 0 Likes
on
0 Posts
Yeah, installing it yourself is definitely the way to go... Then you know where to start debugging when things start to go wrong. If you want to do the isntall yourself the turbo would be much easier than an S/C since there are no mechanical connections to worry about.
For the rest, you gotta do your own research... There's quite a few kits out there at this point. I read about the Mazsport kits as they were coming out and I was impressed, but there may be newer ones that might be even better... Those threads get pretty long but there's no real substitute to getting direct feedback from owners (instead of the "a guy that I know knows a guy who has a greddy kit and it blew his engine up" type of talk)
For the rest, you gotta do your own research... There's quite a few kits out there at this point. I read about the Mazsport kits as they were coming out and I was impressed, but there may be newer ones that might be even better... Those threads get pretty long but there's no real substitute to getting direct feedback from owners (instead of the "a guy that I know knows a guy who has a greddy kit and it blew his engine up" type of talk)
10-10-2007, 10:29 PM
#44
8 all the way
Join Date: Nov 2005
Location: Killeen, Tx
Posts: 340
Likes: 0
Received 0 Likes
on
0 Posts
Before calling the renesis a weak engine, you should research the difference between whp and bhp... 
Most peoples' problems are due to low quality installs, pre-existing conditions exacerbated by the additional load, or bad tuning...
mysql: there's no way you can get a a full system for $3k ;-) An install with that kind of budget will end up as another example of "the weak renesis"
Most peoples' problems are due to low quality installs, pre-existing conditions exacerbated by the additional load, or bad tuning...
mysql: there's no way you can get a a full system for $3k ;-) An install with that kind of budget will end up as another example of "the weak renesis"
I bought my greddy kit for 3k and installed it myself. So I think it is very much possible. And it rean flawlessly.
10-11-2007, 02:22 PM
#47
Destroying Threads
well, seeing that people are pushing 300+ whp with newer turbo kits with this engine, unported just FI kit, and this car has been out for only 4 years, I think we are significantly better, than the other engines
Thread
Thread Starter
Forum
Replies
Last Post
badinfluence
Series II Aftermarket Performance Modifications
6
08-31-2015 11:51 AM