HX40 is out,SPS66 is in!

M

mhuggler

One piece at a time
Joined
Sep 20, 2007
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First off, installation was a breeze! It looks like I.I. changed the wastegate actuator mounting bracket. I didn't have to mod the drain tube at all and I still had tons of clearance.:thankyou2: After a brief break-in, I did some testing. First thing I noticed was the sound; it has a cool whine to it but it isn't near as loud as the HX40.:frown: Spool-up isn't bad at all, in fact I am quite impressed with it given the rotational mass of this turbo. Now for the bad news; EGT's are marginally better than the 40. I was running 42 psi. with the 40(wastegate was set for 36) and I could peg the pyro at will(1600*F). The 66 came out of the box running over 50 psi. of boost and 1400* exh temps. This is with the TST on level 5. I cranked the boost back to 42 psi. and now the pyro pegs just as fast as the HX40!:bang There are no boost or exh leaks, already checked that. What gives? I guess my question would be... Is the SPS66 over-rated or is the HX40 under-rated?(Bear in mind this wasn't a box stock 40, HTT did a good job with it) What kind of egt's are you guys seeing with the 66?
 
my etc 5-spd truck lost 200 degrees across the board going to a HTT super stock 62 so I would think you would get a better EGT reduction than I got.
 
Forrest Nearing said:
I'm thinkin' crank the boost back up to 50psi :confused:
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What boost pressure is the sps66 supposed to be run at? My guage only goes up to 50psi. and II had it set higher than that! I tried to run 42psi because I don't have headstuds yet. Actually I was trying for 40psi but it wouldn't go that low!:ft::hehe:
 
tony597fitter said:
Guess your going to have to buy studs, and a new headgasket.
Its only money.
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Tell me about it.:Throwup: I just saw on Industrial's website that they say the sps66 can support 750 hp. NO WAY!:bs: Even with the boost cranked over 50psi I'm still runnin 1400* exh. temps. I'm barely at the 500 mark, I can't even imagine how hot 750 would be.
 
Generalizations regarding the HP support of any turbo based on your EGTs is a gross over simpliflication. There are lots of factors that contribute to EGTs.
 
they didn't say 750 hp at 1200* on diesel... they said 750hp.

where did you get this magical 1400* number as the end of the horsepower line?
 
Just because you are over 1400* doesn't mean that the turbo won't support it. In a perfect world we would only hit 1200* at our max HP but this ain't a perfect world by far. Once I get twins I'm gonna quit caring about how high my egt's go. Just so long as they stay in a somewhat normal world through the 1/4 I'm fine. Heck, I'm hitting 1600* by the end of the 1/8 mile but the truck is still running good.
 
A SPS 66 or a Silver 66 will work there best at 45-50 on my truck. Currently I have it set at 40 testing the max boost on the bottle and the #2 only is just not quite there, EGT's are higher but not a huge amount.....100 degrees or so.

With everthing right and running about 47 psi I can still make 1700 degrees, this is at 600 hp, 1500+ on Water, if I add fuel via Dragon Flows the EGT's actually go down both with and with the bottle. Either one of those turbo's will make there best power on a CR, 12V's are just harder to do, can't say it won't do it but I haven't.

Jim
 
Well, I suppose I'm just guilty of making assumptions again.(I do it all the time; give me another month or so and you'll see me do it again.)LOL I was just checking out the F1 injector thread, maybe my dirty jammer 4's are partially to blame? I'm planning on getting a set of mach 4's anyway, perhaps some better injectors will help. Time will tell......:pop:
 
a set of better injectors will help with reducing the heat. it will also help cause of the spray pattern and not just dumping the fuel in.
 
SKYNYRD said:
a set of better injectors will help with reducing the heat. it will also help cause of the spray pattern and not just dumping the fuel in.
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"Dumping the fuel in" would be a good way to describe these nozzles. The only time I don't have at least some kind of haze out the stacks is at idle.:Throwup:
 
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