Alright yea.... hmm. Just dont no if i can handle only 450 hp for like a year, haha. So.... if i go with a low comp 408 built, what do i go with like an 8:5 comp ratio and when i get my turbo kit, about what size turbo should i go with and do you think the Hi-Flo kit will do the job, also about how much PSI could i run safely and that would net about how much hp? I highly doubt ill run full PSI all the time, maybe half of its potential but in a race or once n a while crank it up and let it rip.

 

Yea id say aim for 8.5:1, maybe 9.0:1 at the most, that way you can push more boost into the engine without having to use race fuel all the time. You could go with a higher compression than the 8.5 or 9.0:1, but race gas is pretty expensive (about $5 a gallon, however with 93 octane being $3 its not that much more) so its up to you, but I would stick with 8.5:1 personally. The Hi-Flo street kit looks good, and it appears that their system will make some great HP numbersm but I would email them and see what size the turbo is that is included in the base kit and their upgraded kit. I know that PurEvl is running a T-88 turbo on his 408 iron block, but that might be too much turbo for a street driven DD because the bigger the turbo the higher RPM it will be before you see full boost. This is due to the fact that the bigger turbo is gonna need more exhaust pressure to spool and it will take higher RPM's to get the bigger turbo to spool and see full boost. I think a T-76 would better suit your needs as it would spool slightly quicker than a T-88 and you would see full boost sooner and its good up to 950 flywheel HP (heres a link to the T-76) http://www.proturbokits.com/store/sc...p?idCategory=7 . I would contact Hi-Flo if possible and ask them what size turbo their base kit and upgraded kit provides and what rpms the turbo would spool at and see full boost on a 408.

 

Id say you could run 10-12 PSI VERY safely on a forged 408 iron block and would put you well over 600 rwhp. With a good tune the engine would last quite a long time and would make some great numbers (some people will say you can run more boost safely, but safe is open to interpretation). Also, you can get a manual boost controller to up the boost when your ready to race, just need to make sure you get a tune for both low boost settings on pump gas (93 octane) and high boost settings (race fuel).

 

no way u could use a T76 on a 408 efficiently....i may run out of steam with it on my 383 so it definitely wont work well on a 408.give Jose @ forced Inductions a call and hell help u decide with much information on the subject and help u come to the right decision.

 

Really? How many PSI are you pushing with the T-76? I talked to quite a few guys when my buddy was deciding to go Nitrous or Turbo on his 402 and he was recommened a T-76, but then again those could have been the wrong recommendations and he ended up goin with nitrous anyways. He was planning on using it mainly for the street with only a few track trips a year and he was told to go with a T-76 since it would spool quicker and he wouldnt have to wait for full boost to appear at higher RPMs. What RPM does your T-76 provide full boost on your 383 and how many PSI are you pushing?

 

Yea im curious what turbo to go with and about how much psi to run..... get back to me on this....

P.S..... like my new sig, i think its pretty sweet... thanks shouldaboughthez

 

Well I was going from the information I collected from a few board members and a few sponsors that I talked to about 4 months ago when deciding what to do with my buddies 402. However, opinions can def change in a few months time so id take DDNSpiders advice as he has first hand experience with a turbo build up and if a T76 is maxed out on his 383 then a T-88 wouldnt be too much turbo for a DD 408. Also def contact the sponsor's member name he gave in the last post, as from reading a ton of stuff in the FI section Jose def knows what he is talking about and has built plenty of turboed engines.

 

Yea, i e-mailed both Futral and HPE and they gave me basic quotes and what i need but ireally want one of them to tell me all the parts they would use to make the meanest engine for my standards and cost and full blow by blow..... also turbo... what size and psi for how much hp?

 

you cant just say X amount of boost for X ammount of hp,but a good rule of thumb is NA hp X ((psi/14.7)+1) and my cars not done yet,but ive done my research and math calculations for my motor,i know at 6000rpms my 383 will move almost 90lb/min of air and i can plot that on the compressor map for a T76 and look at the efficiency.its close to the edge of efficiency...on a 408 itd be alot worse.you need a T88 minimum.a T76 would run out of steam way b4 redline and be a restriction

 

Wow, those are some impressive numbers out of your 383. Im not sure if you answered this before but what is your compression ratio and when does it redline/what rpm are you going to spin the engine to? I appreciate all the info as it seems the info I got before on what turbo would be the most efficient/effective was obviously incorrect. Thats impressive though, I never would have thought that a T-76 would have been undersized for a 408, but im still in the learning phase of turbos so this real world build info if greatly appreciated DDNSpider. Man I need to see PurEvl's car as he only lives 30 mins or so away from me in Massachusetts and see that T-88 on his 408, it must absolutely scream!

 

my CR is going to be 9:1 but if i could do it again id go for 8.5:1.Im hoping to be able to spin the motor to 7000rmps but the turbo may restrict how high i rev.Jose @ Forced Inductions helped me out alot,for my motor he said for a bad street car do a T76GTS for a track car do a T88.

 

What is the most I could spray on this setup? I want to safely spray a 200 wet shot.

 

Should be able to spray a 200 shot safely. My buddy, along with a ton of the other guys on this board, run a 150 shot on a stock bottom end and it holds up well so a forged shortblock should def be able to safely take a 200 shot. The tune is the biggest thing, along with proper fueling and proper octane. You have all those in order a forged short block, like the one above, should handle a 200 shot for a while with no problems.

 

I sprayed only a 100 dry shot and broke a ring gland on my #7 piston. Id never say that was safe@!

 

its all about the tune,if the tune is decent you could get spray at least a 150 shot seeing how its forged.ls1's prefer wet shots to dry shots from what ive seen and been told and from experience.if you broke a ringland on a 100shot either the tune was off or there was already a problem or other circumstances.i sprayed a 100-125 shot for awhile all the time on a stock shortblock with no problems,which included spraying straight out of the hole.if u tune it right you can spray alot more than that.

 

wow on a 100 shot? Did you have all the safety stuff such as an FPSS, WOT Switch, window switch, etc? Def had to have been the tune because my buddy spray his 150 shot on his cammed stock bottom end for a long time before it blew. Granted it was a direct port wet shot but still a 100 shot should be safe for a stock bottom end for a while.

 

its also driver ability,all i had was a WOT switch and that was it.maybe hes not the best driver or there were surrounding circumstances.

 

A4 WOT switch yes, FPSS no, window switch no.

 

ok, my puter crashed. Thats where ive been. I jsut got it back with comcast but its acting up again shutting down when i try to download programs to get the computer going again so it might be gone for a few days again. Anyway..... Still totally unsure whether to get a turbo for my current engine, run 7-8 psi and forge it later and hope for like 600 rwhp max after build. Or save and buy a new motor and build it for mad NA power and build it for like 550 NA. Or build the same motor but with FI components, low CR and hope for 450 na and than save for turbo farther down the road.......

 

Right now i am sort of leaning towards just getting the turbo kit and run it on 8psi ish and put down about 500. Than save to forge my block and max it out around 600-650 ish. But is that the best route? Should i save for the 408 instead or would that be too much of a hassle, I am really totally unsure of the best route to go. I really like the big lopey NA power but the whistle of the turbo. I would like a turbo set up, with lopey sound from FI cam and good power. I want over 700 to the rears. Thats my goal, best way to meet it?