Competition Silver Bullet Upgrade

[Jim Fulmer]

So the story goes I've been running a SPS 66 for two and a half years now, both in a Twin configuration and as a single. So like you when the Silver Bullets came out I was like hum... ... . !



Talked to Brady multiple times about them and were they were going, just 3 weeks ago I decided to do the upgrade, thinking that maybe it might be a little better, boy was I wrong.



The Silver Bullet is not just a little better than the SPS 66 but a totally different turbo! The very first thing I noticed was how dang quick it comes up on boost, there is less lag without a doubt and it comes up on boost about 150 RPM sooner. Today climbing a tiny hill it was at 13-15 lbs of boost at 800 degrees.



There are a few odd ball things I noticed like cruise EGT's being down a little, WOT is not too much of a change, couldn't really tell today (I did have to drive) with the run but there is no doubt it's stronger and is almost clean. It's really easy to get on top of, so far it has proven to me to be the way to go.



Having said that there are places for this turbo and there are places were it should not be! Saw a truck dyno at 374hp with one... ... this is not it's place, a SPS 62 needs to be there!



Now you ask were does it like to be on my truck with it's lower compression..... 1700 and above, after 1900 it's instantanious and will make 40psi at 1/4 throttle.



Jim

 

[AMassaro]

I'm running the Silver64 and now I wish I got the Silverbullet(66). I love the 64, but I was worried about lag with a larger compressor. I have almost no lag with my fueling, so I know I'd have been just as happy if not happier with the 66. It seems that from 10psi-45psi takes about half a second... Really makes me



:-laf

 

[Jim Fulmer]

You might gain some by going to a 66 but I don't think the cost would justify it. Wish I had a Silver 62 to compare with!



I'm liking this turbo more and more as time goes on, probably have 100 miles or better on it now and has made a couple of real hard passes.



Jim

 

[Hammer]

Jim...

I am curious about the throttle response from 0-1900 rpm range. At 1900,where you are telling us it has "instantainious" response,you have already given up alot of low end response. While I understand that a large single is a give a little to gain a little deal,a big loss on the low end to the average owner makes for a ill running ride. How does it perform off the bottom through 1900 rpms?... ... Andy



On Edit. .

The reason I ask is we have a couple of guys in our club who run these and the one thing they all agree on is how bad the low end lag is. Once they are lit,they are as explosive as you say but the 0-1900 rpm swing is mush.

 

[AMassaro]

I don't have near the experience of Mr. Fulmer, however I believe it all has to do with your fueling capabilities and WHEN you start to fuel. I'm able to dial in my fueling with 3 seperate boxes/programmers with a large variety of fueling. Without that, I think mine would be laggy as well. Honestly my setup doesn't feel laggy at all.

 

[Graphic man]

you went to the S/B 66?

i want to go to something different next year ( Sled puller 66) and i need something larger to cool down the EGT's but i don't want it to laggy for street driving i am thinking on twins to get the quick spool

Scott

 

[RobertP]

you say the SB comes on sooner than the SPS66. now you have my attention. i may start looking into giving brady a call and try to work something out. but i sure do love my SPS66. Oo.

 

[Jim Fulmer]

Robert, if you like the SPS 66 like I did you will Love the Bullet, it's just that much better.



Andy there are allot of variables to deal with: Like how does it respond at 1400 RPM in 3rd at 25 mph..... not good, grab 2nd. I know how to drive the truck and I know how not to drive it, same principle with Twins.



Spool to me is fine to say 1700, a little slow but were dealing with a big turbo! Remember it is never there very long!



To me it's not really RPM it's EGT, once your at 800-900 degrees it's there if you want or need it. Like adding allot of timing, after 25 degrees it doesn't make heat quickly so the lag is there.



As you may know I tune my own valve body! I have the light throttle shifts set to around 1800 so once your there the whole package it there, all depending on how much smoke you want, Personally I like little smoke!



I like the questions! If you guys want me to explain or try something ask! No I have not checked drive pressure yet!



Jim

 

[RobertP]

Jim why did you go and tell me that now i really want one. and i just got the sps66 less than 6 months ago.

 

[JasonCzerak]

Jim why did you go and tell me that now i really want one. and i just got the sps66 less than 6 months ago.

I"ll buy your 66

 

[lmills]

Jim why did you go and tell me that now i really want one. and i just got the sps66 less than 6 months ago.

You know why! It's all part of the game. :-laf LOL It's all about who can empty there wallet and retirement fund the fastest. LOL

 

[crawler]

You know why! It's all part of the game. :-laf LOL It's all about who can empty there wallet and retirement fund the fastest. LOL

Oo. I win I winOo.



Oh crud, that mean I lose in the end right? :{



~Wes~

 

[BradyWilliams]

I will say as Jim has already said, the tunning is very important. The transmission is also a place you can adjust spooling. Now after saying that, the Silver Bullet can and will be a very agressive turbo for you to make hp. It likes fuel and it likes it well atomized for quick spooling. The 3rd Gen trucks have very well atomized fuel delivery. The Silver Bullet has been a nice addition to 2nd gen and 3rd gen trucks but like Jim said, it is not the right turbo if the tuning and fuel delivery is not right. We do have a Silver Bullet 62 for those trucks that need quicker spooling and have less fuel delivery. Our new designed Silver Bullet 64 is also a nice option to help spooling. BUT our Silver Bullet makes great hp and has been running very fast in Drag Racing. I personally tow my RV and a very large boat with mine. I like towing fast and find the extra hp made with the Silver Bullet is a very nice extra when I run into a large MTN. Thanks

 

[zstroken]

What is the max boost suggested on a silver bullet on a 12V???

 

[getblown5.9]

I don't know about all this tuning and valve body talk because I am my own valve body when i decide to shift... but I love my SB66.

It can be a little laggy if you take off at idle and want to get moving fast... but I can put it in 4x4 and light all 4 tires up on a 3rd gear launch if I want because by the time I get the clutch all the way out its seeing 30+psi.

Also I have yet to see over 1400* on the street with my set up which is HRVP44, 200hp sticks, TST comp, and smarty. At full boost it is almost clean as well, can't complain about that because it's surely burning everything I am throwing at it.

The one downside I have noticed tho is that in the last week the weather has went from mid 70's to upper 80's and in the hotter and extremely humid weather, I had alot more smoke during normal partial throttle driving. The crappy air just wasn't good for the aggressive fueling and a large single, so I did have to turn my smarty down a few levels and adjust the way I roll into the pedal. The problem has been eliminated easily!

 

[RobertP]

i have also noticed that since it has gotten warmer i have seen more smoke and about 3-5psi less on boost.

 

[getblown5.9]

I still have the same 52psi max boost, and the same cooling on the top end, just the mid range, and spool up had more smoke. Like I said tho, I pretty much solved the problem with a few minor adjustments.

 

[Jim Fulmer]

What is the max boost suggested on a silver bullet on a 12V???

Currently I run about 46-48psi and there is little to no change with the addition of Water/Meth, but the power increase seems greater than before.



The hard run was fuel only but have made some hard bursts with the Water on too. Although I have the smaller injectors in it right now I did make a run with both stages of N20 on and boost was at 55 do that was nice. I'll try the bigger injectors and a little more bottle and If I can't keep the boost to a normal level, if needed I'll add a 38mm wastegate into the manifold and vent it to the downpipe.



Jim

 

[Jim Fulmer]

Now that I have lots of miles on it and have tested almost everything the results are still a big +



Still almost cleans up all the fuel were the 66 left more smoke, but with the Water/Meth on there is no doubt the power is better, the truck just scoots darn good on it, Boost is still held the same as before and in the 50's on the bottle using the small injectors.



There are a few thing to still test, one is bigger DV's as I have a set of 191's that I got with some other stuff, test with the Dragon Flows and try more bottle as I have the parts but am told the -4 line is at it's limit, more to come!



Spoolup: It all depends on RPM (air flow) or EGT! Most people just talk spool up without looking at the conditions like gear, tire size, EGT's, temps, temps of the engine ect.



EGT's over 600 spool up is fine, over 800 it's like yesterday, over 1900 RPM in O/D..... 3. 54's with 265 tires

(70 MPH) flat awesome, first take off in the morning, perfect! Take off when it's 90 outside and the intake temp at the hat is 150... ... not near as good, this is when you need RPM or make a little smoke.



Tuning the AFC and transmission are paramount in any application, set your plate for power, tune the AFC to bring max fueling at 35 psi or so keeping the AFC back as far as possible but still allowing full fueling and get the light throttle shifts up to 1800-1900 staying just out of limp mode.



If anyone thinks that a Bullet will spool like a HY-35 and make 600 hp they are sadly mistaken... ... . everything is give or take, same thought goes with Twins.



Another thought is testing my HX-40 against the Bullet as I have both, but it's going to take some kill time to do that, don't know if the 40 is up to my fueling, it may go booooooooommmmmmm!



Jim

 

[lmills]

OH my! I can't imagine you torturing that poor 40 like that LOL :-laf