need some wisdom

[gjp]

Well most of you know that i am new to these trucks....sort of.
I took my truck out for some testing tonight. What I found was positive and neg.
First off I am only boosting to 13-14lbs because the I still want to baby my engine and I am not spraying alky. I did a boost launch at 13.5lbs Took off at 3800rpm. My concern is you all talk about spinning tires and my truck does not even at 13.5lbs???? Dm said I did 0-60 in 4.5 and 1/4 in 12.9. Again this is at 13-14lbs. The good thing is I got no knock till it shifted into 3rd. I got about 4* but it droped off fast to 0 again. My questions is should I be spinning tires and does those times look ok for the boost I am running.could the 80e be part of the non spinning of tires? Tires are good BFG KDWS. I will increase boost this weekend till I see Knock. Alky wont be fixed till next weekend as I am waiting on parts.

 

[WyoSyclone]

Re: need some wisdom

Hey Gary,
I took video of every race at Nats this year. The only truck that really spun its tires was Frank's (AutoAddictions) 10-second (almost) Ty. In watching the videos, as long as the suspension stayed loaded (no bouncing) the tires would stay planted, otherwise you could see a little bit of spin... of course this was on a sticky drag strip and not on the street. As long as you're turning good times, not spinning the tires is a good thing

 

[BigBadSmoosh]

Re: need some wisdom

thats a nice 0-60 time for a ty.. and if you are holding 13.5lbs at the line i'd say your brakes are working great..

only problem could be your propshaft breaking if there is too much stress..

 

[wantingasy]

Re: need some wisdom

0-60 in 4.5? I thought you'd be faster then that to 60. I'd say it's a good thing to not be spinning the tires. My ty did it and it was stock, but the suspension was not very good either. I say get the alky working and turn up the boost :tup: Then you should see some 0-60 times in the low 4's or high 3's. If you're launching at 13.5 then you've hit maximum boost as soon as you launch. Turn that sh#t up!!..............just don't break anything

 

[dgoodhue]

Re: need some wisdom

When my truck was running 12.9's, my 0-60 time was either 4.0 or 4.167secs going by Diacom counting frames (going by when the truck first moved until I saw 60mph)

 

[dgoodhue]

Re: need some wisdom

BTW I was definately traction limited at that time. I have since replaced my tires, which were Michelin All season Pilots (6 years old at that time)

 

[gjp]

Re: need some wisdom

the truck turn on once it hits 70+. I can smoke a c6 corvette from 60-100. Low end it feels good but not super fast. Jeremys 11 sec truck felt way stronger low end. front shaft is a gilbert and with the 80E I am not worried about anything trans back. My goal is high 11's on 20-22lbs. I think I am close. I just think the low end is lacking punch somehow. No knock and I was at 11.7 on the wbo2. It went up to 12ish after 3rd. Rears are stock brakes and the front are the ls1 cbr kit. Brakes work great. I can easly hold 18lbs with my current setup. The 2800 stall spools quick. in les then a few seconds I am at full boost.

 

[turbodig]

Re: need some wisdom

Well most of you know that i am new to these trucks....sort of.
I took my truck out for some testing tonight. What I found was positive and neg.
First off I am only boosting to 13-14lbs because the I still want to baby my engine and I am not spraying alky. I did a boost launch at 13.5lbs Took off at 3800rpm. My concern is you all talk about spinning tires and my truck does not even at 13.5lbs???? Dm said I did 0-60 in 4.5 and 1/4 in 12.9. Again this is at 13-14lbs. The good thing is I got no knock till it shifted into 3rd. I got about 4* but it droped off fast to 0 again. My questions is should I be spinning tires and does those times look ok for the boost I am running.could the 80e be part of the non spinning of tires? Tires are good BFG KDWS. I will increase boost this weekend till I see Knock. Alky wont be fixed till next weekend as I am waiting on parts.

You answered your own question. With a 13-14 psi max in 1st and 2nd you won't spin anything.

The 2800 stall spools quick. in les then a few seconds I am at full boost.

Something doesn't follow. If your desired boost is 14, and you're leaving at 13.5, you're at full boost before you leave.

"Good spool up" is soooo subjective. I've seen good stock turbos hit full boost in less than .8 seconds. Full boost being 20 psi.

I would guess you're probably running a bit rich down low.

Fix your 4 degrees of knock on the 3rd gear shift before you go too much higher with boost. You should be able to run that all day on pump gas, unless the chip you're running has lots of timing (> 18) there.

 

[gjp]

Re: need some wisdom

I have a controler and can control the speed and how high the turbo spools too. 11.7 down low 12.2 up high in 3rd. 3rd showed KR but it was just less then a second it droped to .5 and back down to nothing. I was shocked to see 0* all the way up. My truck always had KR. This is with 91 oct. too. wot it has 16.9* timming at 0* KR. at 64mph it spiked to 4* and timming droped to 8.9*

 

[SY2455]

Re: need some wisdom

Gary, Where you spinning the tires with the 700R4? If you were, I understand it do to this factor shown here.

700R4 has a 1st gear of 3.06 X 3.42 gear rearend = a overall gear of 10.53 for launching.

VS

4L80-E has a 1st gear of 2.48 X 3.42 gear rearend = a overall gear of 8.48 for launching.

This is a big jump as far as gears go. And this is just gear comparison you would also have to look at stall speed in the convertor.

 

[Skyhighsami]

Re: need some wisdom

That is what I was going to say is that the first gear in the 80e isn't nearly as deep as the 700. On PT.net alot of the guys are regearing after they go with the 80e to get some of their gearing back.

 

[autoaddictions]

Re: need some wisdom

Im running 30+* of timing under 15 psi and it tapers off to 24* at 25-30 psi. With the longer first gear and not enough timing it will feel a little lazy out of the gate. Duno if you can increase your timing between 1000rpm and 4000 but that will make it pick up.

 

[JSM]

Re: need some wisdom

That is what I was going to say is that the first gear in the 80e isn't nearly as deep as the 700. On PT.net alot of the guys are regearing after they go with the 80e to get some of their gearing back.

I bet they are not running turbos. IMO 700 first gear with a well tuned syty is almost worthless gear.

Like dig mentioned, I also suspect you have some rich issues down low. 13# of boost is fine, but if it is rich it will feel doggy.

Jeremy's race chip I have leaned way out at lower boost for spool. In fact due to track stuff I pulled most the AE out of it, so it drives on street kindof crappy but at the track on the line works well. Again this is his race chip.

Now if he could keep the turbo from burning itself up in less than a yrs time we would be good.