fyi, wiseco does not make a 9.0:1 piston
#43
So you don't get your ******* queer as panties in a bunch look at this dyno. http://forum.miata.net/vb/showthread.php?t=258097
Hmmm, just like a thought....3.5k rpm. I must be a ******* genius, oh wait no, I just happen to know **** about motors...
Hmmm, just like a thought....3.5k rpm. I must be a ******* genius, oh wait no, I just happen to know **** about motors...
#44
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So you don't get your ******* queer as panties in a bunch look at this dyno. http://forum.miata.net/vb/showthread.php?t=258097
Hmmm, just like a thought....3.5k rpm. I must be a ******* genius, oh wait no, I just happen to know **** about motors...
Hmmm, just like a thought....3.5k rpm. I must be a ******* genius, oh wait no, I just happen to know **** about motors...
#46
I've seen enough dynos in my life to know that it will not make any tangible difference in spool. The only thing it will do is make the car a little more peppy off boost. Considering where that turbo will have full boost can you honestly tell me that ******* matters? Even on the highway you will have 250lbft of TQ at what I wouldn't even consider high boost whenever you want it.
edit:: The above post is just an example of a poorly put together setup. I would put 0% blame of that power curve on the pistons. ZERO PERCENT!!!!!
edit:: The above post is just an example of a poorly put together setup. I would put 0% blame of that power curve on the pistons. ZERO PERCENT!!!!!
#48
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I've seen enough dynos in my life to know that it will not make any tangible difference in spool. The only thing it will do is make the car a little more peppy off boost. Considering where that turbo will have full boost can you honestly tell me that ******* matters? Even on the highway you will have 250lbft of TQ at what I wouldn't even consider high boost whenever you want it.
#49
Also, on the actual thread topic, wiseco will make you a piston at any damn compression you want. They run their business based on one offs. Its just places like race engineering that buy large quantities of pistons so people like me can get them in 3days. If you ordered through Wiseco directly even to get an "off the shelf" piston you would have to wait the same 3 weeks as your custom piston. The reason being that they have no "off the shelf" pistons. They are all made to order.
#51
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Also, on the actual thread topic, wiseco will make you a piston at any damn compression you want. They run their business based on one offs. Its just places like race engineering that buy large quantities of pistons so people like me can get them in 3days. If you ordered through Wiseco directly even to get an "off the shelf" piston you would have to wait the same 3 weeks as your custom piston. The reason being that they have no "off the shelf" pistons. They are all made to order.
#52
I'm done man, you can do whatever the **** you want with your motor. I've tried to help you in numerous threads of yours. You're just like a friend of mine, probably worse, in that you just don't trust anyones advice. Even when you ask someone else something, you don't trust their answer or experience. I'm done giving you any of my advice....
#54
Sure, 9.0 over 8.6 is a 1.6% reduction in spool time. If you normally spooled at 4,000 RPM's, you would drop that number down to 3,936 RPM's. Energy is the key word. It takes energy to spool a turbo. Retarding the ingnition timing will reduce the power the engine is making, but increase the energy going into the exhaust and cooling system. That extra energy in the exhaust would help to spool the turbo. Makes since to me to retarding timing at certian times to help spool the turbo. Once it's spooled, then run as much timing as you can.
#55
Rushing an engine together is the WRONG thing to do. Period. You need to do it once and do it right. I've already explained what's important on building and break-in so you know you can't rush this thing together. Let's stop beating that dead horse. I think the members of this forum are in agreement that you need to do some learning on your own. Quit whining.
#56
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I'm done man, you can do whatever the **** you want with your motor. I've tried to help you in numerous threads of yours. You're just like a friend of mine, probably worse, in that you just don't trust anyones advice. Even when you ask someone else something, you don't trust their answer or experience. I'm done giving you any of my advice....
I don't want my car to drive like an MSM, even though that car is at 9.0 and makes 8psi at 4500rpm.
#57
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Rushing an engine together is the WRONG thing to do. Period. You need to do it once and do it right. I've already explained what's important on building and break-in so you know you can't rush this thing together. Let's stop beating that dead horse. I think the members of this forum are in agreement that you need to do some learning on your own. Quit whining.
#59
Not in a miata, but a VW. 8.5:1. It really isn't a slug off boost, it's all in the timing and fueling. If I can find it after work I'll post the dyno charts.
Currently I help with a 8.6:1 20V drag car running a SC61, which is a massive turbo for a VW motor. With a ton of advance down low and pulling some fuel we were able to get it to fully spool at ~5,000 rpm.
8.6:1 is not going to be a problem. I'd venture a guess you could drive two identically prepped cars; one with 8:1 and one with 9:1, and you'd be hard pressed to be able to differentiate.
Currently I help with a 8.6:1 20V drag car running a SC61, which is a massive turbo for a VW motor. With a ton of advance down low and pulling some fuel we were able to get it to fully spool at ~5,000 rpm.
8.6:1 is not going to be a problem. I'd venture a guess you could drive two identically prepped cars; one with 8:1 and one with 9:1, and you'd be hard pressed to be able to differentiate.
#60
I'm familiar with the concept. However, that's 4% peak hp. There is no way to tell power levels at low rpm levels without doing more math than I know how. I do not want this car to drive how my old turbo corrado or jetta did. The corrado went from 130lb/ft to 460 in 700rpm. It was impossible to drive.
The car was impossible to drive.
The car was impossible to drive.
So with a .4 bump in compression it would have gone from 135lb/ft to 465 in 690rpm. How has the situation been improved?