Turbo 4.8 64 Chevy II Build
08-21-2015, 12:01 AM
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Turbo 4.8 64 Chevy II Build I'm getting a 4.8 out of a 2002 Silverado tomorrow VIA UPS, yanking out my old 350..
Plan is to get 500rwhp out of this little motor... its backed by a fully built 700r4 with reverse manual valve body and 2600 stall converter.
Rear end is bone stock 10 bolt 8.2" and I run 8.5" wide M/T drag radials so we will see how long that lasts.
Couple questions... I was planning on running a gt45 turbo.. 44mm tial wastegate and no bov cuz i love the sound of turbo flutter.. Will that turbo be big enough to support 500rwhp and still give me room to grow???
Also I want to run straight 91 Pump gas and don't think I have much room for an intercooler... Did some measuring and it looks like if I can fit one its gona be pretty damn small.. is it even worth running a really small intercooler? Will I have to run Meth to keep IAT down??? From my research I think I'm gona need about 15lbs for my goal.
Would it be worth it to run the TickPerformance Stage 2 turbo cam? Would that help resist detonation and Keep IAT's down at all? Or allow me to run less boost and still obtain HP goal?
Fuel System is a 20 Gallon Fuel Cell with Bosch 044 Fuel Pump and Dephi 60lb injectors...
Will post some pics when Engine Arrives...
Plan is to get 500rwhp out of this little motor... its backed by a fully built 700r4 with reverse manual valve body and 2600 stall converter.
Rear end is bone stock 10 bolt 8.2" and I run 8.5" wide M/T drag radials so we will see how long that lasts.
Couple questions... I was planning on running a gt45 turbo.. 44mm tial wastegate and no bov cuz i love the sound of turbo flutter.. Will that turbo be big enough to support 500rwhp and still give me room to grow???
Also I want to run straight 91 Pump gas and don't think I have much room for an intercooler... Did some measuring and it looks like if I can fit one its gona be pretty damn small.. is it even worth running a really small intercooler? Will I have to run Meth to keep IAT down??? From my research I think I'm gona need about 15lbs for my goal.
Would it be worth it to run the TickPerformance Stage 2 turbo cam? Would that help resist detonation and Keep IAT's down at all? Or allow me to run less boost and still obtain HP goal?
Fuel System is a 20 Gallon Fuel Cell with Bosch 044 Fuel Pump and Dephi 60lb injectors...
Will post some pics when Engine Arrives...
08-21-2015, 09:57 AM
#3
Gt45 is fine and will make over 500hp on a 4.8 easily. It’s still an old design and performs poorly compared to modern stuff. It’s also big/bulky. Since space is an issue, look at the ON3 76mm turbo. It’s half the weight and much smaller physically, leaving more room for piping (and an IC). Also… use small pipe for 500hp goal. A 2” hot-side and 2” charge piping is MORE Than adequate. Neck up/down with couplers at the IC & TB. 2.5 may be easier on the cold side… but 3” is massive overkill. The larger pipe you use the less responsive the system will be. (I’m running 8’s on 2” hotside piping with a 370cu in)
No IC and 91 octane would make me nervous at 15lbs. (even with alky). I’m sure you could fit a small A2W unit somewhere with a 5 gallon water tank in the trunk. Will make a world of difference. I’d throw a alky inj kit on it as well. Its cheap easy insurance.
Cam isn’t going to do a thing for charge temps. Each additional HP you make NA will basically double at 15-16lbs. So yes, a cam can make a big difference. Though it’s not needed to make 500hp. A simple LS1 cam would be a big upgrade over the truck cam and is usually very cheap. (I paid $25 for one recently).
No IC and 91 octane would make me nervous at 15lbs. (even with alky). I’m sure you could fit a small A2W unit somewhere with a 5 gallon water tank in the trunk. Will make a world of difference. I’d throw a alky inj kit on it as well. Its cheap easy insurance.
Cam isn’t going to do a thing for charge temps. Each additional HP you make NA will basically double at 15-16lbs. So yes, a cam can make a big difference. Though it’s not needed to make 500hp. A simple LS1 cam would be a big upgrade over the truck cam and is usually very cheap. (I paid $25 for one recently).
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10-12-2015, 11:39 PM
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Beautiful car!! I have a 62 Chevy II I am wanting to do this to! Except a 5.3 instead of a 4.8!! Looking forward to some numbers!! And you better be saving for a rear!! Ha that one won't last long! Lol
10-13-2015, 02:35 PM
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I ended up having to cut the shock towers this morning. I did not want to do that but there was no way of fitting the manifolds in their without doing that and there are no aftermarket turbo headers that would fit. Welded 2 1/4' pipe to the manifold then gona v-band and run it to the turbo.
10-14-2015, 12:25 PM
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this is what I was told for a very similar question:
I'll be watching this, planning very similar setup for my 66 Nova.
i wouldnt go much if any over 12psi.. It gets to hard to cool. I'd get a devils own progressive kit. they are the best. and run two #12 nozzles.. best way would be to run 8 nozzles, one in each port. you can get away with a bit more that way.
10-14-2015, 12:57 PM
#13
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I would do whatever it takes to ensure that you have an intercooler of some sort, even with modest power goals. And I would still have the windshield wiper fluid nozzles there for insurance.
If a mild turbo cam is in your budget, then it definitely won't hurt anything, but (as stated) even a cheap ls1 cam will offer an improvement.
If a mild turbo cam is in your budget, then it definitely won't hurt anything, but (as stated) even a cheap ls1 cam will offer an improvement.
10-19-2015, 01:28 PM
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I would do whatever it takes to ensure that you have an intercooler of some sort, even with modest power goals. And I would still have the windshield wiper fluid nozzles there for insurance.
If a mild turbo cam is in your budget, then it definitely won't hurt anything, but (as stated) even a cheap ls1 cam will offer an improvement.
If a mild turbo cam is in your budget, then it definitely won't hurt anything, but (as stated) even a cheap ls1 cam will offer an improvement.
10-19-2015, 03:56 PM
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I wanted to get that intake and was advised not to and for good reason. They don't hold up to boost it will split at the welds. You can check out my thread there's some info others had posted about them. Also it's not the same slp that outfitted the ss cars it's some china made company. Sorry to be the one to tell ya but everything else looks great! 
10-19-2015, 04:06 PM
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I wanted to get that intake and was advised not to and for good reason. They don't hold up to boost it will split at the welds. You can check out my thread there's some info others had posted about them. Also it's not the same slp that outfitted the ss cars it's some china made company. Sorry to be the one to tell ya but everything else looks great!