Turbo build questions

Snake_Charmer

Snake_Charmer

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Getting ready to buy an SRT 10. It has 40k on it and stock everything. The back story.... I have a turbo kit that I took off my Vette and want to put it on the truck but need to know what I will be looking at for power etc. The goals are low... good DD street performance low boost. here are the specs on my turbo:

Model: Hurricane 7868
Name: Benita
HP: 650-800
Comp Wheel: HP-78
Comp Inlet/Outlet: 4.0" / 2.5" Non-Ported Shroud
Turbine Wheel: F1-68
Turbine Housing: T4 0.96 A/R
Turbine Housing Inlet/Outlet: 3" V-Band
Bearing: Ball Bearing
P/N: 11535
 
I really have no idea about your turbo but I can tell you that you are limited to about 600-650 rwhp. Seems as most stock bottom ends don't last long at 650 or higher. Are you doing a rear mount kit or will turbo be in engine bay?
 
Contact JMB Justin, think he knows a little about turbos:D
 
As BlackMamba said, contact Justin @JMB Performance
He has DIY turbo kits and can get you all you would need to get it set up, including the very important fuel system upgrade.
 
Thanks guys I will give him a call. I am not stuck on HP numbers by any means. just want fun street not something that is building boost at 5k or 1.5k for that matter. I did a rear mount on my vette and that was pretty fun but didnt have my heart set on anything in particular. Rear mount = lag. lag= sucks..... I had to do ALOT of engineering on the vette to make it efficient.
 
viperhauler said:
600 wheel is safe... 625 is mostly safe... 650 is pushing it...

just rebuild it first...
Click to expand...

I had a very reliable vendor of this forum talk me out of "their system" on stock internals! I was only looking for 600whp, and he said "if you don't want to risk blowing it up, don't build it on stock internals"!!! 600hp doesn't sound to safe to me!!!
 
Snake_Charmer said:
Thanks guys I will give him a call. I am not stuck on HP numbers by any means. just want fun street not something that is building boost at 5k or 1.5k for that matter. I did a rear mount on my vette and that was pretty fun but didnt have my heart set on anything in particular. Rear mount = lag. lag= sucks..... I had to do ALOT of engineering on the vette to make it efficient.
Click to expand...

Do alot of research on rear mount / sts turbos on here you will change your mind. Seems these trucks do not like them for some reason and everyone has blown up at any power levels forged or not.
 
bmxam962 said:
Do alot of research on rear mount / sts turbos on here you will change your mind. Seems these trucks do not like them for some reason and everyone has blown up at any power levels forged or not.
Click to expand...

Yea that seams to be the running trend on here lol. Its hard to read on how unreliable these are over 500 hp. My Ls6 is good past 600 on boost reliably.... thats 200hp over stock and it seems like this motor you add 10hp and your in the engine replacing internals.
 
Haha yes and no. There are a decent amount of members on here running boost that have not had a problem on stock internals. I have a Jmb F1 kit I am going to run on stock internals. Couple guys spraying some big nitrous shots with out problems too.
 
I guess every motor is different two guys could get the same truck with 0 miles and both do the same build and one could go and one could be good for 100k miles
 
the size of the turbo seems ok for your goals. turbos need heat so keep them as close to the heads as possible. Underhood mounting will require custom fabrication of manifolds. there are some challenges to mount a big single turbo under the truck. turbos do not blowup engines, the tune does! but i have a theory that the backpressure from driving the turbine, overheats the exhaust valve and can support detonation. tuning may not be able to correct this. ....just a thought ....for conversation purposes :dontknow:
 
Slitherbeast said:
the size of the turbo seems ok for your goals. turbos need heat so keep them as close to the heads as possible. Underhood mounting will require custom fabrication of manifolds. there are some challenges to mount a big single turbo under the truck. turbos do not blowup engines, the tune does! but i have a theory that the backpressure from driving the turbine, overheats the exhaust valve and can support detonation. tuning may not be able to correct this. ....just a thought ....for conversation purposes :dontknow:
Click to expand...
Thanks for posting this. You said a lot of interesting things. Why do turbos need heat?
 
heat drives the turbine wheel. the smaller the chamber, or in this case manifold the faster the turbine will spool. the down pipe needs to be big to allow the heat to continue its travel without restriction. if there is restriction then there is back pressure. then returning the excess heat into the chamber. so maybe not the tune but more of an understanding of thermodynamics will allow a more efficient set up. Downstream of the turbine you want the least backpressure possible but the heat is what is driving the turbine so that is why wrapping the pipes are beneficial because you are keeping the heat in which in turn keeps velocity up. so pipe size is crucial because too big no pressure and too small too much pressure.
 
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Tune plays a huge part after the dynamics are covered. The VE table is able to be be adjusted to improve efficiency through your range. more fuel is needed. among other things. A bigger turbo will allow improved VE by operating at lower turbine expansion ratios for a given boost level. to me the reduction in back pressure can be eliminated by a large down pipe. Look at diesel trucks they run big 4"+ down pipe with 6" open pipe out the back..... or bed :) they also have back pressure relief valves installed near the turbo.
 
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