Bye Bye thirteens

[FLSY2730]

Anything over 8psi for my truck will produce wheelspin and i have ET streets on the back and drag radials in front with cal tracs, flex a forms and a light truck.
Have not been to the track yet with this Al Dustan front suspension setup, has anyone else had any better luck launching with als front suspension?

Good luck ed, lotta fun isnt it?

 

[SY1373]

You have gone 7.80s on stock everything?
What did you do to it , high boost?, shed some weight?
Just curious.[/quote]

Not to hijack this thread but 8.002 with the ultimate t1-20 setting, drop in filter and safety mods. 60K original build, turbo, downpipe, ic and factory exhaust (w/ cat deleted). 7.803 with the above + a 35hp wet shot. Unlike others, knock was not an issue and mat's decreased considerably.

I made hundreds of 0-60 mph blasts watching the gtech and boost gage. I only modify the optimal launch at the track if lucky enough to follow track prep (allowing a hotter launch). After numerous street cars or at T&T, I may have to back off by 1-2 psi.

With a serious build, a multi-stage boost controller is the way to go. Launch at a selected boost, then progressively step up the max boost for each gear to prevent blowing the tires in 1st or 2nd. For someone serious about 60' times, try a circle track qualifying secret - paint your tire face with track bite before going to the track.

Buck

 

[ed hess]

brian

All of this problem is because the 412 does not give a linear progression of power. Instead it gives it all to you at the bottom end. Had i known this i wouldnt have used it.

as for the big drag radials, sounds like a good 1st step. Maybe it will work well enough that i can skip doing the external stuff and just use the controller for 15 psi launch and then higher boost after launch. Hopefully with a lot of praying and fingers crossed. At least i can start with that.

What wheels work on our trucks that are wide enough for these larger drag radials with the different front and back offsets using 17 inch size?

I assume fender clearance is fine with these sizes?

Can i drive on 2 dif sizes for the 20 mile round trip to the track without hurting the transfer case clutch or am i going to have to swap tires in the pits doing this?



Guess i should have long talk with tony about his setup.
I plan on talking with tom ferrick about this as i am sure he and harry went through this problem in the past also.

Harry just keeps telling me to yank the cam and he will tell me what to use that has a linear curve to it. Harry tells me its easier to go 10's if i did that.
Im just dont want to go back into the motor yet.
Besides my goals are only 11's and driving daily without borrowing an exhaust pipe at 2 year emissions intervals.

 

[smeagol]

All of this problem is because the 412 does not give a linear progression of power. Instead it gives it all to you at the bottom end. Had i known this i wouldnt have used it.

I wouldn't go blaming the cam for that right away. It seemed to work *OK* for Tony

Lots come into play here, again. A slower spooling turbo, different characteristics of head work, different calibration, different stall converters.

Many people are doing well with similar combos. The drag radials would make a hella-difference. Do some searching Ed, the 275/40/17 front and 315/35/17 rear combo is popular. Also, it provides almost identical wheel circumferences, and on the ZR1 wheels (or ZR1 wheel offset) they fit the trucks *perfectly*.

 

[ed hess]

brain

thanks for pointing me in the right direction on the actuall tire sizes and wheels.

Now i understand how front and back are different sizes with the 40 vs 50 size difference it now makes sense.

zr1 wheels look fine by me. and they are probably plentiful and cheap.

Except that i'll probably go out and get some that are chromed

one last question on the wheels:

You wouldnt happen to know if our lugs work on these?

You also mentioned front end height. I think my front is higher now with the new motor. water pump is aluminum and the headers might be less than the manifolds. But there is no rake from front to back anymore.

Any idea what the stock height was supossed to be on the front vz baack measureing from a point on the cladding?

I know i had this before but cant find it now.

Seems to me a bit lower than stock on the front might help some with not slaming the back so far like a do now.

Do caltracs keep the back from going down?


ed

 

[ed hess]

brain

actually i'm not blaming the cam. You know harry and tom. I know youve spoken with them. What i was saying was more of what harry thinks. i.e i am just the messenger per se.
I really honestly dont have a friggin clue on this stuff. Thats why i went with what seemed to be the popular combo that was used on the bbs here.

ed

 

[AXXE]

Ed, launch it at a lower boost. I go consistently 1.75 and better at Atco leaving at about 4 psi. I think Mike Pearce has gone as quick as 1.63 there. We both use the same Nitto NT450 tires. They are not drag radials.

 

[ed hess]

axxe
I think its Mark but anyway

I guess you missed my point:

Your 60ft at 4psi = 1.75 not spinning

my 60ft at 14 psi =1.76 spinning badly

What i want to do is use it all to max out the 60ft!

or find the optimum to get more than 1.76!

 

[ed hess]

i just realized that brian and mike hammrhead gave me 2 different sizes for the rear. which is correct

front 275/40/17

rear from mike 315/35/17

rear from brian 315/50/17

which is it?

ed

 

[AXXE]

I get your point, but at least if you tried leaving at lower psi, it would be better than what you are doing now. The 12.0 Ty was I was with at Englishtown the other night was leaving at 3-5 psi, getting mid 1.7s.

 

[hamrhead]

i just realized that brian and mike hammrhead gave me 2 different sizes for the rear. which is correct

front 275/40/17

rear from mike 315/35/17

rear from brian 315/50/17

which is it?

ed

From what I can see we both gave you the same rear tire size for use with 11" ZR1 rims. 315/35/17.

 

[Blake]

315/35 R17 is what worked on mine in the rear. That size looks GOOD under the rear.
George

 

[ed hess]

damn you both did give me the same number....
sorry about that.

its been a trying day here. Somebody backed into my truck and fucked up the bumper and cracked 1 leg in the grill and next to the headlight bezel in the gray area.

One of my employees actually with a customers truck that did not damage the other truck, it went over mine......


shit

ed