The cubic inches are already there for sure. The key to making the big power is in the heads, this is part of the reason why LS1's make so much power for the cubes. When you have a head that flows 360-370cfm with race porting...that makes ALOT of difference. Also running long strokes is a bad idea, since you will wear into the block a good bit due to the rod/stroke ratio and wear down the rings. Also running a pair of 90mm's...lol, where are you going to put them?? A 91 requires a huge 5" DP, 7" intake and 4" discharge. Routing a pair of 5" downpipes would be a feat in itself and would require extensive cutting.
Also the comment on a diesel, that does not apply to a standard petro motor. A diesel exhales alot more exhaust volume, thus you can spool turbos quickly. We have a Cummins in testing that is making 40psi by 1800rpms using a fairly large T4 turbo...hehe
The cubic inches are already there for sure. The key to making the big power is in the heads, this is part of the reason why LS1's make so much power for the cubes. When you have a head that flows 360-370cfm with race porting...that makes ALOT of difference. Also running long strokes is a bad idea, since you will wear into the block a good bit due to the rod/stroke ratio and wear down the rings. Also running a pair of 90mm's...lol, where are you going to put them?? A 91 requires a huge 5" DP, 7" intake and 4" discharge. Routing a pair of 5" downpipes would be a feat in itself and would require extensive cutting.
JZ 97 SS 1500, you are right about the heads and the sheer physical size of the bigger turbos and the piping associated with them! :thumb:
PT67, standard S cover, and T4......this is the typical units we run on the Viper kits.
PT88, the largest T4 based turbo, uses an H cover and 4" downpipe.
GT47-88, this is the drag radial turbo of choice and is the turbo between a T4 and full blown thumper. It does though come with a T6 flange It uses the smaller 6" intake and 4" discharge cover. The wheels on this turbo are actually almost indentical to the PTE-88 above, but external size is as you can see, much larger.
I also have new pictures of some other turbos as well as some prototype units and a Turbonetic unit that is coming as well. Also coming is a Y2K-88 but will be T4 based . I should have this turbo within the next few weeks.
Every time you see a picture of a turbo they are always siting on the floor.
Does anyone have a clean table to set these expensive parts on? Seen one photo of one on a dirt floor! They are expensive ya know.
Also one thing alot of folks are overlooking is compressor maps. Simply slapping a larger turbo on doesn't mean its going to make more power for the range of boost you are running. You guys need to take a look at the 488, 510, 520...etc ci consumption charts and then cross reference them with compressor maps. This will give you what boost level and turbo will work most efficiently for your setup. If you need help feel free to send a PM.
Yea Jose...jus as we were talking a bit ago...maybe yer table ain't big enuff fer them there big turbos!!.......are you gonna post the compressor maps we jus talked about??..Len
Yea Jose...jus as we were talking a bit ago...maybe yer table ain't big enuff fer them there big turbos!!.......are you gonna post the compressor maps we jus talked about??..Len
lol.....yeah. Anyhow here is Turbo 101 from the Turbo Slut, or what me and Len discussed...lol
Here are some consumption charts. This is using a base EV constant of .86. Stock intake, stock race ported heads (ala 310cfm flow)and stock 97 cam profile. We all know that the EV will not be a constant due to VE changing but for calculation purposes we will simply things. Of course they will not skew off by much anyhow. Also this is assuming 120 deg intake temp since most of these setups will be air to air. What you are looking at below is a chart showing what a Viper engine consumes in lbs/min of air. This can then be used to chart its efficiency on the compressor maps island.
For a complete rundown into turbo selection, check out link below...it has some other charts in there for 510 ci, and 575ci. If you don't see one for the cubic inches you want to run, feel free to shoot me a PM and I will have it added.
I'm sure the import crowd would argue, they wish they had more ci.
There always comes a point when you wish you had more ci. Nothing makes power like big ci w/high flowing heads and big turbos.
I agree that if we had heads the flow over 350cfm we would not need as many ci. But the simple fact is, it just isnt out there (yet???). So to make up for it, you need larger ci.
Paolo we are looking at using the stock castings now to achieve those #'s. New casting are cool, but I am sure they will be expensive. I am the type that likes to make HUGE power, but on a budget. As for the turbo slut...lol, yeah, thats just a nickname I have gotten. I kind of like it, and since I own and test a few turbo cars it helps the knowledge base some. I have alot more data to share with the Viper crowd. If they want to go fast, then I will help them get there. I have some spreadsheets as well cross-referencing the CI's with the compressor maps already plotted and even have a spreadsheet for manipulating for meth injection. I will be testing a mix of meth, with nirtomethane soon. I have all the parts and just needed to recheck that the nitro will not eat the seals on the pumps. Its nice when you can achieve 1000+rwhp and do it on 93 octane in the middle of summer. And with the proper Nitro mix, we should be able to achieve 200-300rwhp more on 93. I will post the results.
Also just for you Forced Induction Viper owners we are building a full database and technical breakdown webpage of setups, engine combinations, dyno's...etc..etc.. all coming soon.
theres a few 183ci supras running that gt47 88mm..... one of which has made over 1500rwhp Another just made 850rwhp on pump +meth, on a horrible dyno run @ only 24
. I should have this turbo within the next few weeks.
