Twin engine GTP project progress thread

[TwinV6GTP]

for the "idle" trans we use a flat towing trans circulation pump to keep the guts of the rear trans wet while in neutral with the engine off.

We were planning on doing this if we were to street drive a lot. Right now what I do is leave the engine running in neutral but I never go far without both engines running. The rear engine does not have heat problems at all. it runs 190F steady in 80F weather. I can leave it running. The front engine has a lot of strain if it's the only running engine even for cruising. It's best to leave both running it runs better that way although a little harder on fuel.

for short distances after being recently started and shutoff he should be fine since its mostly a racecar.

the Tq converters will stall as much as they need (slip) to equalize the load depending on the traction/load, that the beauty of a viscous tq multiplying drive. when launching the rear see's everything (one reason our 25.3 chassis is using 4x4 LCA hardware/heims and extra bracing)

so yer probably right the 1-2 did it in. but keep in mind that 400ftlbs is plenty to break a stock IS when the shock load can have the converter multiplying that up to 1000+ for a split second. plus without the rear driving a SC yer already 50+hp more than the front engine just from the crank not spinning it.

I will be forcing the trans in 2nd gear for launches. With more boost it will launch just as hard. When the front engine will be turbo, it will also leave in 2nd gear.

you may want to look into the 3.71fdr 80e though i dont think it will clear your unibody rails, thats just a mallet and a few licks away....

looking good guys.

kinda make me pissed we havent gotten more done on the 442 in the 14 year build/rebuild/rebuild lol

Thanks ! Yes it will probably motivate you to do a last push to complete your own crazy project.
AS for the 4T80E it's a heavy pig, and the weight is already an issue. I am genuinely worried about being able to slow down without a parachute. It will be hard to slow down from a 145 mph trap speed at 4500lbs + race weight on stock size GTP brakes. I'd love to go bigger but I won't be able to run my slicks up front.

Also how much wider is it from the block to the body ? I only have 2 inches between the trans and the rear frame rails or 1 inch between the factory trans mount gusset to the rail.

[Turbocharged400sbc]

We were planning on doing this if we were to street drive a lot. Right now what I do is leave the engine running in neutral but I never go far without both engines running. The rear engine does not have heat problems at all. it runs 190F steady in 80F weather. I can leave it running. The front engine has a lot of strain if it's the only running engine even for cruising. It's best to leave both running it runs better that way although a little harder on fuel.

We are likely switching to the rear as the primary powerplant... its built for low/mid range tq, so it is far more suited to moving the heavy car by itself than just the front engine which is set up for mid range and top end power

Thanks ! Yes it will probably motivate you to do a last push to complete your own crazy project.
AS for the 4T80E it's a heavy pig, and the weight is already an issue. I am genuinely worried about being able to slow down without a parachute. It will be hard to slow down from a 145 mph trap speed at 4500lbs + race weight on stock size GTP brakes. I'd love to go bigger but I won't be able to run my slicks up front.

Also how much wider is it from the block to the body ? I only have 2 inches between the trans and the rear frame rails or 1 inch between the factory trans mount gusset to the rail.

while the 4t80e weighs 65 pounds more it is far stronger in every way Plus you should probably be tuning your engine braking tables to help at the track.

you could probably fit in there just using a hammer

[TwinV6GTP]

We are likely switching to the rear as the primary powerplant... its built for low/mid range tq, so it is far more suited to moving the heavy car by itself than just the front engine which is set up for mid range and top end power

while the 4t80e weighs 65 pounds more it is far stronger in every way Plus you should probably be tuning your engine braking tables to help at the track.

you could probably fit in there just using a hammer

Where is that table in HP tuners ?
Is it the downshift table at zero throttle position ?

What's needed on the electronic side to make it work ?
I read that you need to grind the block a little and make custom bracket for the K-frame which isn't hard to do.

[penright]

I like the vents, maybe some pictures from the inside on how it's duct through. Good look.

IN the back I ended up with the factory shocks/springs but they are heavily preloaded to reduce squatting to a minimum.

Right now with what I've got just a stiff rebound would work well as I can already adjust spring rate. With the high spring rate comes the pogo effect with tired stock struts.

yeah we have to utilize double adj mustang front struts in the rear to have any compression adjustment

Forgive my ignorance in my questions. It's been a while since I messed with suspensions. My limited experiences was open wheel cars and that was torsion bar technology. Coilovers were just begging to be seen at the local track. In fact my friend was an engineer and he was experimenting with them. Most of what I learn he taught me, that and Physics in college.
My question is how do you adjust the "rate" of a spring without having to change the spring?
When you talk about "preloaded", are you actually compressing the spring? If so how does it change the "rate"?

Hooke's law is a principle of physics that states that the force needed to extend or compress a spring by some distance is proportional to that distance. That is F=kX where is k a constant factor characteristic of the spring, its stiffness.
BTW, it's been so long I had to google Hooke's law, did not pull it off the top of my head. :-)

So what all can effect the 'k'. Size of wire, material, diameter of the coil, and etc... What little googling I did, there was a technology where the spring attached to a lever and by changing the connecting point, there by the length of the lever, you could adjust the "rate".
So how is the rate changed? This whole discussion if fascinating. Have not been to a track in years, but back in those days your competitor did not share much. I mean they did help you with enough setup to keep you safe, but not much to make you fast. :-)

[darkhorizon]

Pull tons of power at the 1 2 shift.. way easier than dealing with a second gear start or anything. On my drag car I run a touch of fuel cut on the 1 2 shift.

[TwinV6GTP]

Pull tons of power at the 1 2 shift.. way easier than dealing with a second gear start or anything. On my drag car I run a touch of fuel cut on the 1 2 shift.

I regret not leaving some form of torque management now. I knew I'd be looking into a built trans when the power went up but not at this low power level.
We are swapping the trans now from the parts car to the twin engine. And I will do 2nd gear start and see if it can last in those conditions. If it doesn't the project will be on hold till I get a built trans.

[darkhorizon]

I would really melt your noodles if I did the 5speed front and auto rear setup ive planned out for the last year... lol...

[Turbocharged400sbc]

Hpt sucks
Dhp/tiny/uv fer tha win

you need to do an inverter on one of the shift solenoids but Dave Norris at triple edge figured out the settings to use with the tech2 so that you do not need to invert the shift solenoid signal

[Turbocharged400sbc]

so did you figure out a hand or left foot throttle yet?

[TwinV6GTP]

so did you figure out a hand or left foot throttle yet?

Just added another throttle cable to the same pedal.

I can throttle the rear engine independantly for spooling up the turbo. I can't throttle the front engine independantly.
So I can shut the rear engine off and leave in Neutral while I do my front burnout, then I can do a rear burnout with the front engine still running.

[TwinV6GTP]

[Russosaur]

Oh god the car looks so ugly without the spoiler

Sent from the Milky Way

[Jomamma]

Oh god the car looks so ugly without the spoiler

Sent from the Milky Way

At least there aren't any holes in the bumper....

[TwinV6GTP]

At least there aren't any holes in the bumper....

speed holes... they were made to break from 11.0 to 10.9 but it didn't work lol on the parts car.

AS for the spoiler, it was removed to make space for vents but I have figured out something cool with the spoiler on, you guys will see soon.

[BillBoost37]

Search on Trans/info and my name. for that trans stuff.

[Turbocharged400sbc]

you might want to go ahead and just put another gas pedal to the left of the brake

the car is a crap load more fun

[TwinV6GTP]

you might want to go ahead and just put another gas pedal to the left of the brake

the car is a crap load more fun

I will for sure, we just did the quickest solution for now just to get running. The car is far from a complete project, it's just the beginning.

[Turbocharged400sbc]

the rear engine bay air exits just fine out under the rear bumper into the low pressure area behind the car. on top of the trunk will not be nearly as good of an air flow path

[TwinV6GTP]

the rear engine bay air exits just fine out under the rear bumper into the low pressure area behind the car. on top of the trunk will not be nearly as good of an air flow path

That's where the radiator was going to go, in an angle with the fans blowing air through the trunk but we have it in front of the engine right now, with the airflow under the car, it stays pretty cool.

[Turbocharged400sbc]

keep it there you dont want that weight at the back of the vehicle. our new chassis is goin to only have the fuel cell that's at the rear of the car...it looks like we might be able to do saddle fuel tanks in front of the rear engine with the new radiator set up...but the fallback is at the rear...away from the driver lol

your goin two want to try to keep as much of the weight towards the CoG.