wanting to push the limits of a 408
Thread Starter
TECH Apprentice
Joined: Jan 2007
Posts: 396
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wanting to push the limits of a 408 hey everyone, im building a fully forged 408(iron block lq4 to start with) for a customer of mine in plans of procharging it. i havent ordered all the internals yet but thats why im here now with 2 questions
1. what compression would be best to go with, i was thinking 8.7:1, basically what were shooting for is the nastiest engine we can get to run on 93 octane. meth injection is an idea too.
2. Which model procharger should we go with, im thinking F1A, like i said it will be street driven, not really daily, but it needs to deal with some stop and go. theres no emmisions here so thats not a big deal
BTW its going in a 99 TA 6speed
thanks, Mark
1. what compression would be best to go with, i was thinking 8.7:1, basically what were shooting for is the nastiest engine we can get to run on 93 octane. meth injection is an idea too.
2. Which model procharger should we go with, im thinking F1A, like i said it will be street driven, not really daily, but it needs to deal with some stop and go. theres no emmisions here so thats not a big deal
BTW its going in a 99 TA 6speed
thanks, Mark
What are the goals for the car? On a 4-bolt setup you can run it close to 1000 rwhp without pushing a lot of water, after that the issue becomes pushing water/lifting the heads. As stated above if your going procharger an F1 model should be more than enough for your build, but again it depends on the customers goals. As for compression I would agree and reach out to Bob @ EPP. Lots of FI builds nowadays are running 9.0-9.5:1 compression so you could probably go a little higer than 8.7:1 but id ask the pro's about that.
The crew at Exotic Performance Plus are building me the exact motor.I will still use my ProCharger from my present LS1 and up the boost for the new motor.I am looking foward to a possible 650 RWHP on the new set-up.They build a lot of motors and they also sell and install Pro Chargers.Give them a call.
Thanks everyone, we appreciate it! We do indeed shoot for a compression ratio around 9.5/1 for using an ATI ProCharger. There is no need to drop the compression ratio any lower than this. I agree that the F-1A is the blower to go with. Bob
Oh nice yea 750+rwhp on a forged 408 and F1A is not difficult in the least and probably would even be pushing the motor or blower to its limits. Hell, ive seen 346ci forged ls1's making 750rwhp with a D1SC/F1A combo so you should exceed those goals.
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See sig. Made that on pump on a 103° day with an intercooler restriction problem. Have new intercooler and new problem. Will dyno again soon. I may spray it one day on top of the boost.
I'm shooting for about 8.75:1 and 15psi around town, possibly 20 at the track, we'll see. Would rather add a little timing with the added boost and prevent any possible detonation.
Thread Starter
TECH Apprentice
Joined: Jan 2007
Posts: 396
Likes: 0
well ive been thinking about the money hes wanting to put into this thing and ive decided to not build the motor and buy a short block and do the top end myself. money isnt really an object, what would you guys reccomend for the baddest street car i can get? ive been looking at a texas speed 418 and 427, any comments?
thanks, Mark
thanks, Mark
well ive been thinking about the money hes wanting to put into this thing and ive decided to not build the motor and buy a short block and do the top end myself. money isnt really an object, what would you guys reccomend for the baddest street car i can get? ive been looking at a texas speed 418 and 427, any comments?
thanks, Mark
thanks, Mark
If money isn't an object, take a look at this build that we are going to start tuning on today. http://www.exoticperformanceplus.com...Car.php?car=51 Bob
Very nice guys.
