13.5 ET or lower on SPS 62/71/14 What Mods?

wildcat455

wildcat455

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Ok, the back story is this:

With my truck basically stock, ( See mods in Signature.. ) and on the stock turbo, I was running around a 14.2 1/4 mile @ 93 MPH.

I swapped the stock turbo for a SPS 62/71/14, I did head studs at the same time.

Right away, I noticed it didn't spool low in the RPM like the stocker, but it felt great once it lit.

Basically, anything over 1500 RPM it begins to light on an empty truck, loaded heavy or towing 8000 pounds, anything under 1800-2000 RPM is doggy, which causes me to take the truck out of Overdrive when I need to drive around 50- 65 MPH.

I began my search for a tuning combination on my Smarty that would light the turbo quicker down low, that might also be used for towing when the RPM was below 1800-2000.

A track night comes along, and I decide to see if the larger turbo made a difference. Well, it did, but NOT what I expected. My 1/4 mile times were in the 15.5 to 15.8 range with a speed of 95 MPH.

I have a tight converter that will not let the truck rev over 1500 RPM when attempting a boosted launch, but none of the previous runs on the stock turbo were boosted, either.

I guess what I'm getting to is this:

1). The SPS62 is a "Popular" turbo for our trucks. What supporting mods are you guys running to AT LEAST get in the 13's in the 1/4 mile??

2). How hot are your EGT's with your mods??

3). What kind of HP numbers are you seeing on the Dyno??

I'll use this data to see if this turbo will end up being right for me, or if I'm going down to a 62/65/14 or something.

Thanks allot guys.
 
Boosted launch is the key to quick ET. You should be able to spool that turbo just fine, sounds like a loose or leaking wastegate puck. Could need more preload adjustment by shortening the threaded rod, just remove one end and shorten 3-4 turns. Could be a machining flaw that won't let the puck seat all the way to get a good seal. Remove the inspection plate and inspect. Could be a bent wastegate lever arm.
 
It spools ok.. once I get above 1500 RPM. I can't boost launch because my Torque Converter holds RPM down below where the turbo spools, so any attempt to boost launch is really just a smoke show.

I will have a shop look in to your suggestions. They sound reasonable to me.

Assuming there is nothing wrong with the truck or turbo, I am still curious what everyone's (who are running Or who have run this turbo) answers are to the 3 questions in the first post...
 
Sounds like you should have your tc made looser. You'll love it! I had mine made looser 3 times till I was happy spoiling that sps62
My truck ran 13.5 no problem, boosted launch (2000 rpm)
with edge juice and jammers. This is at almost 7000 feet elevation.
 
That makes sense for the racing portion of the equation.

Anyone know what the adverse effects to raising the stall would be??

I'm thinking maybe fuel economy?

Anyone know offhand what the stock Torque converter stall is?
 
Wildcat455 I know you do some towing with your truck so don't go too loose when you do upgrade the TQ converter

BTW 13.5's can be done with all the following OEM stock parts= cam ,springs, injectors ,exhaust manifold, cp3, intercooler, 4 inch exhaust with cat etc

all you really need is a HTT HTB2 62/65/14 or 62/71/14 with a
solid (Built Transmission) that along with a min 95 fass pusher pump or other comparable pump & AFE stage 2 air intake etc.

Bully dog crazy larry tune & pressure box
or
smarty beta 4.2 ,4.3, or maybe 4.4 & a pressure box Edge EZ or TS MP8

and decent tread on stock size tires w proper air pressure

13.5's is very easy with minimal mods

and of course with proper boost launch in 4X4 HI & leave it in Auto OD let it the truck shift on its own

this should be good especially with a(good built valvebody set-up)
 
Last edited:
Or contact JTaylor and ask him about running 13.08 in his 2003 2wd with stock lift pump, stock injectors, stock cp3, stock intake, stock exhaust, stock open rearend, stock tranny except TCI single disk, and a HE351 off a 04.5+ truck.

Of course he had a smarty, TST, and Edge EZ but I'd venture to say he could run 13.5 or very close with just a Smarty.
 
wildcat455 said:
That makes sense for the racing portion of the equation.

Anyone know what the adverse effects to raising the stall would be??

I'm thinking maybe fuel economy?
Click to expand...

None, other than the potential to get it hot if you tow pretty heavy.

The converter spends most of its time locked up so there will not be an adverse effect on mileage. Drivability can potentially suffer, but you would have to have something really loose before that would happen. A looser converter will feel better in my opinion because of the added torque multiplication you will get when the stator redirects more fluid.
 
desertchecker said:
Wildcat455 I know you do some towing with your truck so don't go too loose when you do upgrade the TQ converter

BTW 13.5's can be done with all the following OEM stock parts= cam ,springs, injectors ,exhaust manifold, cp3, intercooler, 4 inch exhaust with cat etc

all you really need is a HTT HTB2 62/65/14 or 62/71/14 with a
solid (Built Transmission) that along with a min 95 fass pusher pump or other comparable pump & AFE stage 2 air intake etc.

Bully dog crazy larry tune & pressure box
or
smarty beta 4.2 ,4.3, or maybe 4.4 & a pressure box Edge EZ or TS MP8

and decent tread on stock size tires w proper air pressure

13.5's is very easy with minimal mods

and of course with proper boost launch in 4X4 HI & leave it in Auto OD let it the truck shift on its own

this should be good especially with a(good built valvebody set-up)
Click to expand...


I agree with this fully. I had one on mine as a single for a while and was running around 13.5 with stock everything except GDP 392 fuel pump and 35" tires. That turbo will spool just use brakes liberally and press pedal till you feel a surging and smoke goes away then its ready should be about 12-15psi.
 
Thanks for the replies, everyone!

NICK!! (Desertchecker) Brother, I owe you a great big THANK YOU!!
Your PM to me on another board was SPOT ON!!

He suggested Among the things he mentions here, that I try to adjust the little allen screw on the little brass 90 on my boost reference hose.

Tonight, I turned it in 1.5 turns, and Voila! Welcome to boost!!

Now, I can accelerate while holding the brakes and build boost! I stopped at 10 PSI @ 1500 RPM.
NO more heavy black cloud of unburned fuel, while the boost needle on the gauge rests comfortably on the ZERO!

A quick run up the highway showed an increase of max boost, to 44PSI, from 38! Unsure if it will boost higher than that right now, further testing will have to be done when it's not raining.

Tonight, I was running Smarty REVO SW#9 TQ4, TM3 RP2
If it wouldn't have worked, I was going to try RP3 then RP4. EGT's were 1250-1300 MAX, about 700-800F cruising 70 and loitering around 900-950F climbing a 6% grade, after accelerating from 55 to 75 MPH.

Smoke was minimal! Power was THERE!

The truck felt freakin Awesome!!

I'm pretty happy right now!

Coming from an electronic waste gated turbo, and no previous diesel experience prior to this truck, I had no idea that adjustment was there. I felt pretty foolish, but that quickly went away when it worked! lol
 
it would be a pain now that the turbo is installed,but I always run the spring loaded drive pressure wastegate actuators on the S300's

glad you found an easy fix! :D
 
wildcat455 said:
Thanks for the replies, everyone!

NICK!! (Desertchecker) Brother, I owe you a great big THANK YOU!!
Your PM to me on another board was SPOT ON!!

He suggested Among the things he mentions here, that I try to adjust the little allen screw on the little brass 90 on my boost reference hose.

Tonight, I turned it in 1.5 turns, and Voila! Welcome to boost!!

Now, I can accelerate while holding the brakes and build boost! I stopped at 10 PSI @ 1500 RPM.
NO more heavy black cloud of unburned fuel, while the boost needle on the gauge rests comfortably on the ZERO!

A quick run up the highway showed an increase of max boost, to 44PSI, from 38! Unsure if it will boost higher than that right now, further testing will have to be done when it's not raining.

Tonight, I was running Smarty REVO SW#9 TQ4, TM3 RP2
If it wouldn't have worked, I was going to try RP3 then RP4. EGT's were 1250-1300 MAX, about 700-800F cruising 70 and loitering around 900-950F climbing a 6% grade, after accelerating from 55 to 75 MPH.

Smoke was minimal! Power was THERE!

The truck felt freakin Awesome!!

I'm pretty happy right now!

Coming from an electronic waste gated turbo, and no previous diesel experience prior to this truck, I had no idea that adjustment was there. I felt pretty foolish, but that quickly went away when it worked! lol
Click to expand...


wildcat455 your welcome ! Im glad it works for you now :rockwoot:
 
Forrest Nearing said:
it would be a pain now that the turbo is installed,but I always run the spring loaded drive pressure wastegate actuators on the S300's

glad you found an easy fix! :D
Click to expand...

What is that?

Is that like that Bullseye thing Desertchecker posts about?

Just curious.

Everything is going good right now, I probably wont take things apart to put one on, but if I ever have the turbo off...

Any instructions or pictures anywhere?
 
wildcat455 said:
What is that?

Is that like that Bullseye thing Desertchecker posts about?

Just curious.

Everything is going good right now, I probably wont take things apart to put one on, but if I ever have the turbo off...

Any instructions or pictures anywhere?
Click to expand...

Bullseye sells one, but E.D. sells one that actually fits ;)
 
I made over 50 passes in the 13.4x range with several different programmer/box combinations. Bullydog 2.4.d and dr. p 2021 module was like a 13.6, diablo and dr. p module 13.4s all day long then went to smarty and played around with beta 4.4 and a quadzilla race x2 and ran a few in the 13.3 range. Again this was on a bone stock truck like the day it rolled off the factory floor stock exhaust muffler and cat, stock intake, transmission, etc. Just a programmer and a box. These newer trucks are capable of alot with minimal mods. Your boosted launch is going to help out alot and also a lockup switch will be a big help as well.
 
Yea you should definetly be in the 13's. My 07 6spd with just a Smarty and a Silver Bullet ran 13.50 at 101 last summer. Thats leaving in 2nd gear at 20 psi boost. I believe it had faster times in it if I would have launched in 3rd.
 
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