Greddy Turbo Installed - Details Inside!!!!
02-03-2005, 07:03 PM
#1301
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**** the bed!
What great info!!!!!!!!!!!!!!!!
I wish the UK forum was as good as this one...........
So, injectors willing, 13psi boost should give an easy 100whp with the Greddy kit (if the turbo can puff that flow at high rpm & keeps charge temps in check).
Some nice tuning should see 300rwhp (that's without even thinking abot Nitrous).
I'm going to have a happy nightshift just contemplating
Now I just want MORE INFO :D
What great info!!!!!!!!!!!!!!!!
I wish the UK forum was as good as this one...........
So, injectors willing, 13psi boost should give an easy 100whp with the Greddy kit (if the turbo can puff that flow at high rpm & keeps charge temps in check).
Some nice tuning should see 300rwhp (that's without even thinking abot Nitrous).
I'm going to have a happy nightshift just contemplating
Now I just want MORE INFO :D
02-03-2005, 08:32 PM
#1303
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Originally Posted by Nemesis8
Jeff & Jon, the little birdie divulged his source today about the 13 PSI. It was part of the classroom training to become a master mechanic on the Renesis down at Irvine. He said the 13 PSI was in their training text for the maximum safe level of boost. He also said that sure, the seals will take a hell of allot more boost, but after all the testing on blowing engines down there, they settled on 13 PSI as the max safe boost with OEM seals. He got to watch them blow one up. He said the entire building was vibrating just before it blew.
He also showed me where our trannies are failing. Its the plate that keeps the main shaft from moving back and forth. It's a small part that is not very thick. He said it was a weak design, and the outside edges fracture and allow the main shaft to move. He said you can fix it without opening the tranny up pretty simply. He told me that if I wanted a better tranny, to drop in the Mazdaspeed Miata tranny. It bolts right up. They added triple syncros to the 1-2 and the 3-4 shift. The exact place that has been discussed at length in different threads where owners experience problems.
He said to wait a year or so, and we will all be surprised what is coming our way. He said the USDM MS8 will be boosted to about 8-10 PSI, but it is down the road aways behind the Mazdaspeed 6. That is what corporate told them at school.
He also showed me where our trannies are failing. Its the plate that keeps the main shaft from moving back and forth. It's a small part that is not very thick. He said it was a weak design, and the outside edges fracture and allow the main shaft to move. He said you can fix it without opening the tranny up pretty simply. He told me that if I wanted a better tranny, to drop in the Mazdaspeed Miata tranny. It bolts right up. They added triple syncros to the 1-2 and the 3-4 shift. The exact place that has been discussed at length in different threads where owners experience problems.
He said to wait a year or so, and we will all be surprised what is coming our way. He said the USDM MS8 will be boosted to about 8-10 PSI, but it is down the road aways behind the Mazdaspeed 6. That is what corporate told them at school.
In the future, I'm going to be looking into finding a bigger 'blower' section of a turbo and see if I can bolt it to the T618Z. Who knows.. maybe it can be upgraded with just a blower section so I can get more boost.
02-03-2005, 09:01 PM
#1305
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I think that is a little optimistic on the 300 to the wheels. Probably more like 280 because the max theoretic hp is about 308, but that is not including inefficiency, heat generated, tuning, etc.
[(Boost/14.7)+1] x Stock whp
should give you maximum theoretical whp numbers for your level of boost in psi.
[(Boost/14.7)+1] x Stock whp
should give you maximum theoretical whp numbers for your level of boost in psi.
02-03-2005, 09:09 PM
#1306
Originally Posted by philodox
Now you're certain he said 13psi right?
I told him that ever since he said 13 on Tuesday it was bugging the crap out of me.
Last edited by Nemesis8; 02-03-2005 at 09:21 PM.
02-03-2005, 10:44 PM
#1307
Could you just STOP it you guys. Please, you can't predict hp from boost.
You can't, you can't. Your formula doesn't even allow for density delta IE heat rise. You can't do it.
Pressure is not mass. Your not even deducting for the power to drive the compressor. And if you come back and tell me it's free becuse it is wasted exhaust heat then I quit.
I know RG gave up trying, I might too.
You can't, you can't. Your formula doesn't even allow for density delta IE heat rise. You can't do it.
Pressure is not mass. Your not even deducting for the power to drive the compressor. And if you come back and tell me it's free becuse it is wasted exhaust heat then I quit.
I know RG gave up trying, I might too.
02-03-2005, 11:27 PM
#1309
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Originally Posted by Richard Paul
Could you just STOP it you guys. Please, you can't predict hp from boost.
You can't, you can't. Your formula doesn't even allow for density delta IE heat rise. You can't do it.
Pressure is not mass. Your not even deducting for the power to drive the compressor. And if you come back and tell me it's free becuse it is wasted exhaust heat then I quit.
I know RG gave up trying, I might too.
You can't, you can't. Your formula doesn't even allow for density delta IE heat rise. You can't do it.
Pressure is not mass. Your not even deducting for the power to drive the compressor. And if you come back and tell me it's free becuse it is wasted exhaust heat then I quit.
I know RG gave up trying, I might too.
By this logic it seems awfully strange that my old '88 RX-7 made about 100 hp more than my friend's '89 T-II RX-7. I was running 10 psi to his 10 psi. Of course his turbo could fit inside of mine and so could his ports and his intercooler! But hey, boost pressure is always equal to the same boost pressure right?
02-04-2005, 12:33 AM
#1310
I've got to get that plot from Airflow Research showing the four different blowers in a comparison test. All with 7 psi. My blower made 70 HP more then the next guy. 
Hymee, you have that plot, don't you? If you can find it you can post right? You have all that computer know how. I guess I can find it around here someplace and buy a scanner.
But post it on my thread, I'm hurting for posts behind philodox. We were neck and neck in the stretch but he's got me by a nose.
Hymee, you have that plot, don't you? If you can find it you can post right? You have all that computer know how. I guess I can find it around here someplace and buy a scanner.
But post it on my thread, I'm hurting for posts behind philodox. We were neck and neck in the stretch but he's got me by a nose.
Last edited by Richard Paul; 02-04-2005 at 05:33 AM.
02-04-2005, 11:31 AM
#1314
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I believe what you said about the tranny weak point. But about the Miata tranny, it will not bolt in, (bellhousing pattern is wrong) and the RX8 tranny already has triple cone synchros.
02-04-2005, 11:42 AM
#1315
Originally Posted by NAVILESRX8
I believe what you said about the tranny weak point. But about the Miata tranny, it will not bolt in, (bellhousing pattern is wrong) and the RX8 tranny already has triple cone synchros.
02-04-2005, 03:56 PM
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Hi. I'm a n00b.
I read through some of this thread and I think it's very helpful. You guys really know what you're talking about! There were a couple of things I had heard about regarding the GReddy turbo kit. I think most of this stuff might have been covered but I still had some questions for the guys with F/I RX-8's:
Any problems with rough idle, poor throttle response, stalling, or bogging?
Have any of you turbo guys tried using the cruise control? It seems like the minor corrections that cruise control makes could be the difference between boost and no boost, depending on what RPM you're at. That could make for a pretty rough ride.
Thanks in advance for any help you guys could give. And please excuse my n00bness. I have to learn sometime.
I read through some of this thread and I think it's very helpful. You guys really know what you're talking about! There were a couple of things I had heard about regarding the GReddy turbo kit. I think most of this stuff might have been covered but I still had some questions for the guys with F/I RX-8's:
Any problems with rough idle, poor throttle response, stalling, or bogging?
Have any of you turbo guys tried using the cruise control? It seems like the minor corrections that cruise control makes could be the difference between boost and no boost, depending on what RPM you're at. That could make for a pretty rough ride.
Thanks in advance for any help you guys could give. And please excuse my n00bness. I have to learn sometime.
02-04-2005, 08:30 PM
#1319
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So has anyone had any problems with the kit im intrested in getting it but i would like to know if there was any problems with it i read alot about it in here but dont have the time to read all the post please let me know a.s.a.p so i know if i should order it let me know if you all think it is worth it and ....problems along with ...
02-08-2005, 08:31 AM
#1322
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Originally Posted by epitrochoid
a friend of mine who lurks here put down 248hp with the greddy kit on his 8.
02-08-2005, 08:56 AM
#1324
RX8 and a Truk....
248whp = 240whp....differences of 8 peak hp could be the result of atmospheric conditions, spark plugs...may factors. I've seen (not with my rx8, but a previous boosted car) 7hp from simply changing old (3 weeks old) spark plugs for new plugs, on back-to-back dynos.