HP Twin Kit
Thread Starter
Racer
Joined: Apr 2005
Posts: 357
Likes: 0
HP Twin Kit
I am getting a HP twin turbo kit in may (shipping it to them for install), it will have an electronic boost controller set from 6-9.5#'s boost.
1) Will the stock bottom take 9.5 if i run 104 octane
2) Do i need an alky kit at that level
3) If i did a rebuild and dropped to 8:1 how high boost level could i run?
Thanks for any help and I will keep you all updated
1) Will the stock bottom take 9.5 if i run 104 octane
2) Do i need an alky kit at that level
3) If i did a rebuild and dropped to 8:1 how high boost level could i run?
Thanks for any help and I will keep you all updated
Team Owner
Joined: Jul 2003
Posts: 20,474
Likes: 2
From: Detroit
1. Yes, with a good tune.
2. No. Totally depends on tune and amount of boost.
3. You don't need to drop the CR that low. 9:5.1 is fine. The amount of boost you run has much to do with the turbo kit itself. There are guys that run 25+ pounds of boost on a 346.. All depends on specifics.
Mark
2. No. Totally depends on tune and amount of boost.
3. You don't need to drop the CR that low. 9:5.1 is fine. The amount of boost you run has much to do with the turbo kit itself. There are guys that run 25+ pounds of boost on a 346.. All depends on specifics.
Mark
Le Mans Master
Joined: Nov 2000
Posts: 7,391
Likes: 3
From: Chandler AZ
1) Really depends on how you plan on driving the car, whether or not you consider it a daily driver, and what your expectations for longevity/reliability are. 9.5psi is running on the hairy edge for the stock hypereutectuc pistons ESPECIALLY on a turbo application. I assume this is on a Z06... with its higher compression ratio the gun is already half cocked. Ya, some get away with... but I know of some that didn't last.
2) I'd let the tuner tell you if you need alcohol injection. If your power expectations have been realized by a tune only (dyno and drivability), I assume with running 104 Octane 100% of the time, you would not need it.
3) IMO, Typically 8.5-8.75:1 (nothing higher than 9:1) CR coupled with a good turbo grind cam you could see 10-13 pounds of boost on 91 Octane. If you want to stick with 104 Octane, then obviously you could turn up the wic and spool 14-17 psi quite comfortably... this assuming the turbo's are correctly matched to the application.
Looking forward to seeing your results.
Best of Luck
Bill
2) I'd let the tuner tell you if you need alcohol injection. If your power expectations have been realized by a tune only (dyno and drivability), I assume with running 104 Octane 100% of the time, you would not need it.
3) IMO, Typically 8.5-8.75:1 (nothing higher than 9:1) CR coupled with a good turbo grind cam you could see 10-13 pounds of boost on 91 Octane. If you want to stick with 104 Octane, then obviously you could turn up the wic and spool 14-17 psi quite comfortably... this assuming the turbo's are correctly matched to the application.
Looking forward to seeing your results.
Best of Luck
Bill
Thread Starter
Racer
Joined: Apr 2005
Posts: 357
Likes: 0
Yessir, thats why I am shipping it to them. The have me scheduled for the end of may. It is not a daily driver, i put about 5k miles a year on it. I will be running race gas 100% of the time. My daily driver is a Subaru WRX (ok let me have it LOL). I will mostly run my vette at the 6 pound setting but eventually plan on getting the bottom end built.
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