Need base SpeedPro program

[the Sandman]

Can anyone send me a base SpeedPro program - my Syclone engine project is nearing completion. The build:

Stock block - 0.010 overbore
Pistons - forged JE
Stock crank - strenghened and stroked
Displacement - 4.6 Liters
L35 heads - "enhanced"
Stock upper & lower intake - "enhanced"
Exhaust manifolds - custom equal length headers
Crossover pipe - eliminated
Turbo - Innovative GT61 dual BB, T4 turbine A/R .7 (probable)
Downpipe - custom 3 1/2"
Injectors - 72 lb/hr
C/R - 8.5 to 1 (probable)
EFI - FAST / SpeedPro
Wastegate - Innovative
BOV - HKS "racing"
Electronic boost control - Innovative
IC - "enhanced" water/air
Air Intake - modified ATR
"Enhanced" water and oil cooling systems

Engine will be tested and tuned on an engine dyno prior to reinstallation - anyone have the SpeedPro stand alone harness?

 

[Ian Turgeon]

Re: Need base SpeedPro program

Stock crank - strenghened and stroked
Displacement - 4.6 Liters

Crossover pipe - eliminated

Downpipe - custom 3 1/2"

sorry I cant help you with the speedpro bit, but your build has me confused

1:how do you stroke a stock crank?
2:if you eliminated the crossover pipe, does only one bank feed the turbo? is it twin? Dont quite get the exhaust/turbo layout your describing.

 

[smeagol]

You can stroke a stock crank, but you weaken it significantly. Ask Ron Gregory, his snapped.

The elimination of the stock crossover has me confused too.. it's a lot easier to say it's twin turbo.. unless there is some wacky exhaust manifold creation where the headers meet in the middle (??)

 

[CLONE]

Re: Need base SpeedPro program

The build:
Stock crank - strenghened and stroked
Exhaust manifolds - custom equal length headers
Crossover pipe - eliminated
Turbo - Innovative GT61 dual BB, T4 turbine A/R .7 (probable)
Downpipe - custom 3 1/2"

Adding strength to the stock crank while adding more stroke sounds like a busted crank waiting to happen.

Your exhaust system sounds interesting, where did you locate the turbo? Do you have any pics yet?

 

[keith455]

Sandman,
This combo sounds interesting.
Thing that has me wondering is why did you "enhance" L35's when Vortecs are available and you didn't list any connecting rods.

I'd like to come check it out sometime.
Let me know when you're around. I have a speedpro program , but no harness, that will get the truck up and running i'll mail it to you tonight.

 

[the Sandman]

You can stroke a stock crank, but you weaken it significantly. Ask Ron Gregory, his snapped.

The elimination of the stock crossover has me confused too.. it's a lot easier to say it's twin turbo.. unless there is some wacky exhaust manifold creation where the headers meet in the middle (??)

The crank was sent out to one of the top crankshaft guys in the country - He has tons of experience with racing and high performance applications and required us to send him the crank for inspection before he agreed to do anything to it. He was able to stroke it to 3.7 inches and maintains it will hold at least the same power levels as the unmodified stocker. The fact that another stroked stock crank broke did not surprise him in the least - nor did it make him back off his assurances that his will hold - his work is superior. Besides, the whole engine including the crank will be streesed to the max on the engine dyno and if the crank does go it's not so big a deal - worth the risk. If the crank guy is right (which Dennis believes) this will be a major step forward in stock SyTy engine upgrading.

We'll be running a single turbo. The headers are already built, equal length (26") 1 5/8" diameter with each side running into an equal length collector - The collectors will join just before the turbo. There will be a small takeoff from each collector which will join at the wastegate. This is a big departure from the ATR headers which are basically the stock manifold design recreated in stainless steel tubing. The benefits of this setup include significantly more efficient exhaust scavenging, greater velocity, excellent access to the plugs, better wire routing, and much better boost control. Not to mention great flow. I'll post pictures when it's all together on the engine stand and you can decide for yourself if it's whacky...

BTW Dennis has been in consultation with Duttweiler concerning the cam specs - Duttweiler happens to be working on a Typhoon right now - stock engine rebuild including stock heads. Anybody's we know??

 

[CLONE]

If the crank guy is right (which Dennis believes) this will be a major step forward in stock SyTy engine upgrading.

Seems like a step backwards by weakening the crank to produce more torque which we already have an overabundance of.

 

[the Sandman]

Sandman,
This combo sounds interesting.
Thing that has me wondering is why did you "enhance" L35's when Vortecs are available and you didn't list any connecting rods.

I'd like to come check it out sometime.
Let me know when you're around. I have a speedpro program , but no harness, that will get the truck up and running i'll mail it to you tonight.

Our goal with this build was a stock engine rebuild on a reasonable budget with high horsepower but more importantly high torque through an extremely flat, long powerband. In a word, streetability. This setup is not designed to be for an all out quarter mile racer which is why we're going with a moderate sized turbo rather than a big honking one. Airflow from intake to heads to cylinders is significantly increased, but Dennis did not want to sacrifice low lift flow or velocity and felt the L35's best suited these goals. Max flow through the intakes (.600 lift) is about 250 cfm BUT low lift flows (.300) up are outstanding. Exhaust port flows max at 200cfm and the I/E ratio is above the magic .8 at all times, by a significant amount at mid flow. Yes, the big Vortecs, Brodix, and Bowties flow more at high lift but there is a loss of low and mid lift flow and velocity.

Bottom line, with this setup there will be very little turbo lag with a "relatively" low stall speed convertor and excellent off idle and mid range response at the expense of ultimate high end horsepower at WOT. Quarter mile won't be too shabby though I think...

You're right Keith, I didn't list the connecting rods in the build sheet. Damn, how could I forget?? Give me a call and we can get together - I'm not doing the traveling thing anymore so I'm usually around...

 

[smeagol]

Yes, the big Vortecs, Brodix, and Bowties flow more at high lift but there is a loss of low and mid lift flow and velocity.

As far as I know, this is where the Vortec heads really shine, not sure where you got that info.

Curious to see how it all turns out.

 

[the Sandman]

If the crank guy is right (which Dennis believes) this will be a major step forward in stock SyTy engine upgrading.

Seems like a step backwards by weakening the crank to produce more torque which we already have an overabundance of.

So obviously you don't believe my crank guy - he has no reservations about the strength of the stroked crank and assures us it will hold at least as much hp and torque as the untouched stocker. No sense in speculating further as the crank is already done and will be run - we can actually watch what happens. The fact that one stroked crank went south doesn't necessarily mean a properly prepared stock stroked crank can't live.

So you're saying that we already have too much torque and shouldn't build more? If you say so...then definitely stay away from stroking your motor.

 

[the Sandman]

Yes, the big Vortecs, Brodix, and Bowties flow more at high lift but there is a loss of low and mid lift flow and velocity.

As far as I know, this is where the Vortec heads really shine, not sure where you got that info.

Curious to see how it all turns out.

The purpose of this thread was to find out if anyone had a base SpeedPro program or stand alone SpeedPro harness (used to run the engine on an engine dyno without a truck) I could use. That's why I posted my engine build. I expected questions, and I expected skepticism, and I am not disappointed. Dennis could have used any heads he wanted and he wanted the L35s. He's EXTREMELY happy with the way they came out. Maybe I misunderstood his reasoning about the flows, I don't know - I don't build engines. As far as the crank goes, he sent the crank in and had it evaluated at the beginning - nothing else was decided until it was clear that the stock crank could be stroked. Then all subsequent planning and modifications were based on the new displacement. He would not have done this if there was any doubt in his mind about the crank.

How many other builders of SyTy engines even use an engine dyno?

 

[CLONE]

So obviously you don't believe my crank guy - he has no reservations about the strength of the stroked crank and assures us it will hold at least as much hp and torque as the untouched stocker. No sense in speculating further as the crank is already done and will be run - we can actually watch what happens. The fact that one stroked crank went south doesn't necessarily mean a properly prepared stock stroked crank can't live.

So you're saying that we already have too much torque and shouldn't build more? If you say so...then definitely stay away from stroking your motor.

I don't believe a crank that has been welded, ground, cut or whatever can withstand as much abuse as a stock crank properly prepped. I don't believe whoever is feeding you the rubbish that you need to add more stroke to build more torque. Obviously they haven't seen the dyno sheet's that stock stroke motor's with decent flowing heads have produced. There is no need to reinvent the wheel with building these motor's. The relatively small amount of stroke you've added is not worth the added weakness you've introduced in the crank IMO. Hopefully it'll work out for you and you won't have a bad experience.

 

[the Sandman]

So obviously you don't believe my crank guy - he has no reservations about the strength of the stroked crank and assures us it will hold at least as much hp and torque as the untouched stocker. No sense in speculating further as the crank is already done and will be run - we can actually watch what happens. The fact that one stroked crank went south doesn't necessarily mean a properly prepared stock stroked crank can't live.

So you're saying that we already have too much torque and shouldn't build more? If you say so...then definitely stay away from stroking your motor.

I don't believe a crank that has been welded, ground, cut or whatever can withstand as much abuse as a stock crank properly prepped. I don't believe whoever is feeding you the rubbish that you need to add more stroke to build more torque. Obviously they haven't seen the dyno sheet's that stock stroke motor's with decent flowing heads have produced. There is no need to reinvent the wheel with building these motor's. The relatively small amount of stroke you've added is not worth the added weakness you've introduced in the crank IMO. Hopefully it'll work out for you and you won't have a bad experience.

There are many ways to strenghen a crank. The offset grinding will weaken it to some degree but this is mitigated by the strenghening techniques. There are also engine building techniques that lessen the stress on the crank. As I said above, no need to speculate. I'll post the results in a couple of months when the engine goes on the dyno.

BTW, that "small amount of stroke" is SO worth it.

 

[FLSY2730]

Where in florida do you live sandman???

 

[Ian Turgeon]

sandman in the tampa area, near keith and my parents.


sandman: For your sake I hope your trusted experts are right in this case. We have heard quite a few experts proven wrong in the past in our camp. Its interesting to hear of unique builds, and cant wait to see how yours holds up/performs.

as keith mentioned earlier, I'd love to come by and check out what your doing as well.

 

[the Sandman]

sandman in the tampa area, near keith and my parents.


sandman: For your sake I hope your trusted experts are right in this case. We have heard quite a few experts proven wrong in the past in our camp. Its interesting to hear of unique builds, and cant wait to see how yours holds up/performs.

as keith mentioned earlier, I'd love to come by and check out what your doing as well.

Hey Ian

Sure, let's get together - you can check it out - no problem.

The build may be unique to SyTy's but it's proven race/high performance technique. Nothing is guaranteed but since we're going to thoroughly thrash it on the dyno it's definitely worth trying. If the crank fails we'll try something else. My bet is that it won't fail though...