Quote:
|
Originally Posted by 99turbo
After reading Dyno Daddys thread I thought I should respond to it. I have built turbo systems for vipers and Dyno Daddy made some great points on having a large frame single turbo viper. But unfortunately he does not have the first. I have had the system developed and running for about a little under a year now. The points that he made are the same ones I was making years ago. The vipers have enough power in the low end that they really don't need anymore. And I think and know from experience that the heat soak from two small or mid frame turbos upfront would be more than the one large frame. And they make some great coatings to help out with heat problems. You could also run lower boost levels and lower your air temps. I'm not saying anyones kit is better than another's or to say singles are better than twins thats up to each persons opinion. Hell they have some very fast twins running around Ex: Heffner and Underground racing, They haul ass and are on top of their game. I know alot of work went into making those cars run like that. But I have the first front mount large frame single turbo viper. I have dynoed the car on strait 93 octane (no mix!) and the car has already made 1xxx on a mustang dyno. Dynos are made for tuning so I'm not going to make any claims on what the car is going to run at the track. But this car is very very fast, we will be taking it to the track soon to play with the suspension. http://www.hltd.net/media/viper.w |
99Turbo, sounds mean as hell when that turbo comes on! I am curious what size turbine side and downpipe you are running. Can you please post a dyno graph?
I toyed with the idea of a front mounted single turbo and mocked up several different layouts one GT 42 and one thumper while I was making the setup I did for my car.
For the GT 42, I thought the 5" compressor inlet and the 3.5" V-band compressor outlet made things pretty tight. I also thought the 4" exhaust might be limiting in terms of backpressure for higher HP applications with the internal volume of a 4" .065(16 gauge) pipe being almost exactly the same as a pair of 3" .065(16 gauge) exhaust pipes.
The Thumper turbo has a 5" exhaust whose internal volume with .065 wall pipe is 44% greater than a pair of 3" pipes.
Very good for minimizing backpressure.
BUT very hard to fit.
The thumper is about 12.5" tall from compressor inlet to turbine outlet.
Add a 5" exhaust outlet with a 5" on 5" centerline radius(7.5") with a 6" on 6" centerline radius for the compressor inlet(9") makes 12.5" + 9" + 7.5" = 29"
That's no problem except for the fact that the upper frame rails are only 28" wide where the thumper would go.
Then you have a 3.5" or 4" compressor outlet to get through on the passenger side and a 4" intercooler outlet to get through the core support, through/past the sawybar, past the monster turbine housing with 5" exhaust, past the upper radiator hose and into the throttle body(s).
Then the crossbrace is a major dilemma to fit in there to brace against the upper front shock mounts from flexing towards the center of the car.
The 5" exhaust is another whole challenge to fit out as a 5" pipe.
Splitting the 5" pipe in 1/2 is fine but you need to make (2) 3.5" exhaust pipes to make for 96% of the volume the 5" pipe had.
(2) 3.5" pipes are not too easy to fit out either!
When I mocked up the thumper it was also very tight to the radiator fan which surely was not a good thing!
All in all, I realized the monster thumper, although it could maybe be squeezed in there, would not be something the average guy would want to have so many compromises for cooling and the added radiant heat of two 3.5" downpipes or cutting God knows what to get that 5" monster single exhaust out. The frame also needs to be cut/notched to fit the 5" pipe through the outer, lower frame rail where the exhaust comes out to make the 90 to go back down the sidesill.
The GT 42 WAS a nice single turbo to fit in there but was still cumbersome in terms of the bigger radius bends associated with the bigger housing but was definitely do-able. I just did not like the limitation of the size of the turbine wheel and the volume of the AR compared to a pair of 76 GTS's.
This is why I went with the front mount twin setup.
Your car is bad as hell, please post a dyno sheet! :thumb:
Linear Mode
