ColtGT4g63

Almost here!!!! Few more days...

I'm certainly going to be subscribing to this one!

Awesome! Ya I think I've heard of Factoryfive before. They build lawn mowers or something along those lines, right?

Lips are sealed...

I was going to post it for sale in the classified here, but I am not a donating member so I wasn't able to make an ad. I will post some pictures of "the plan" as soon as the big truck comes down my street and drops off "the plan" in my garage.

You guessed it, I have been Datsun-less since late August. discuss...

That looks like a beefy radiator, I'm sure it would work.

converter was ordered as a 4500rpm stall. But on the car actually testing it out, when I hit the button and floor it, the RPMs instantly go up to 3k and will very slowly creep up as the turbo spools. I have the 2 step set at 3500rpm so once it hits that rpm I can build about 1/2 of my boost before its time to launch. Still good enough for 1.4 - 1.5 60's.

Okay guys, I know I am long over due for an Update so here is one hell of an update. Back in May I went to the track and wasn't able to get more then 103mph out of it, at nearly 13psi. In the past at the same boost I've gone 105 - 106mph! Here is a video I edited of my night out at the track back in May. So after this track day I started running E85 in the car, because race gas is just getting too expensive! I also took the car to the dyno and put down a max of 504hp and 459tq. This was at about 12 - 13psi. Looking at the dyno graph there is a pretty steep drop off just after 5k. So I was racking my brain trying to figure out why. *light bulb goes off!!!* Way back when I trapped 106, I was using an LS6 intake, and a bigger exhaust side on my turbo. Makes sense I guess. And when I went to the track in may, I was on an LS1 intake and a smaller A/R exhaust housing and smaller turbine wheel. So After the dyno I swap the intake back to the LS6, and swap the turbo back over to the larger exhaust side turbo. Also had to upgrade the fuel system a bit due to the E85. So I make all the changes, and take the car back out to the track last night. VERY pleased with the results! 1st run: 6.5 @ 106.8 with a 1.49 60ft.! 12.7psi 2nd / 3rd runs 6.6's @ 107 mph. 1.5 60ft's 14psi. 4th run 6.5 @ 108.4mph with a 1.50 60ft. 15psi. At this point I was at 100% duty cycle on my injectors and decided to call it a night. I drove to work that morning, drove to the track afterwards, then drove to In n out, then drove home. As I upped the boost at the track, I noticed that my traction started getting a little worse. I guess I'm finally at that power level. Here is a video I edited of some of the dyno stuff, and then one of my runs out at the track last night. enjoy!

WOW that looks like a tight fit!!! If that motor fits, then that means the Supercharged motor out of the 03 - 04 cobra will fit too, right? Looks good!

With a good tire on the back you should easily get into the 7's.

Some heaters have a heater control valve, which is closed (blocking the flow) if the temperature is not set to heat. Other cars will have coolant circulating through the heater core at all times. And just use the blend doors inside the climate box when the temperature is set to heat. If you're worried about it, loop it and kink the line. And when you verify for yourself that its not blocking the flow to the radiator, then pull the loop off and plug 'em!

Congrats! I see some 7's in your near future. What is the mod list on the LS1?

In the past I've used a Walbro 255 and the C5 regulator set up, using -6 lines all around. Always read 58psi at the fuel rail. If you are reading 80 psi there is a problem elsewhere. Maybe the regulator is bad? maybe the return line from the regulator to the tank is way too restrictive? Maybe the fuel pressure gauge you're using is bad?

I thought the same thing and have come up with a couple possibilities. On my old motor I had a couple things different then what I've got on my new motor. Old motor: I used my "bigger" S400 turbo. The one with the 1.32 A/R exhaust housing, and 96mm wheel. New motor: I'm using a smaller S400 with a 1.1 housing and 83mm exhaust wheel. Old motor: used the MegaSquirt to control the ignition, which didn't seem like a very reliable way to do it. When looking at the timing with a timing light, the timing mark would jump 5* - 6* So I may have been running more timing before then I thought I was. New motor: Using the MSD 6010 unit to control the ignition timing. At the track, I noticed that my trap speed did not change too much when going from 8psi - 11.5 psi. It stayed around 100mph. When I set the boost up to 12.9psi, I also bumped the timing from 13* up to 15* and it trapped 3mph more. So I really don't know if it was the timing, or the boost that helped. All I know is that on my old set up I was able to get 106mph trap speed out of it,(with a messed up launch even) at about 11.X psi. So I may throw the larger turbo back on there and give it another try. I'm going to the dyno in 2 weeks here, so we'll see how well this little 4.8 can handle some power. I am also going to be running the car on E85 from now on. So it should make things interesting.

Damn that looks pretty good. If you can get it all said and done for less then a few hundred bucks, I would say you're in good shape. Is the turbine inlet a T4 or T6 flange?

No worries. It went fast, and is now resting in peace. I know what to look for now when motor shopping, so I do appreciate the info.

Just measured the stroke. Its a 4.8! WAAAAAAAAH!!

I would still run it, and not think twice about it. I've seen people run turbo's that have got bent up fins and not even know it. Are you talking about the HX50? I probably wouldn't put anymore money into it then you have to. Considering you could swap to a borgwarner turbo for pretty cheap. How much would a new compressor wheel run you anyways? And how much does balancing run? You could probably get away without even balancing it if the chip is as minor as you say.

Q45 rear diff with the custom axles. 280Z stub axles, regular 'ol 2.5" steel driveshaft with 1310 U-joints. There really isn't much diff angle at all. 3.54 gears, Mickey Thompson E/T drag 26 x 8.5 x 15 with tubes and wheel bolts / locks mounted on some stock wheels. still 4 lug in the rear. I broke two axles when the rear end stuff was stock. Have not broken anything since swapping to the set up listed above. I've done a best 60ft of 1.483 And done countless transbrake launch's

I've ran that old motor SOOOO lean, and made plenty of mistakes on it. And it kept running like a champ. These truck motors are pretty darn forgiving!

That's some good info to know. I'll have to go measure the stroke to confirm, but after reading what you wrote... I wouldn't be surprised to find out that it really was a 4.8L. And with that being said. I guess I really ran a 6.6 and trapped 106 with a 4.8! Wahoo!!!

Tibby - I'm sure I'll be able to make enough power in my 4.8 to run a 9. Which should be plenty. I swear the most fun I've had in my car was with the 6spd manual and the 5.7, I could jump in and drive that thing anywhere. And also run low 7's in the 1/8th without having to worry about a thing. Things are more complicated now and I certainly don't have as much fun with it outside of the track, But when I'm at the track its a complete blast! Cable - The piston tops of my old 5.3 are flat tops. Check it out: So the only difference between the 5.3 and the 4.8 is the stroke? Maybe I should turn the rev limiter up??

Maybe look into a boost-a-pump for that walbro? Or upgrade. And I would probably get some bigger injectors as well. I would certainly run an intercooler on there too, even if you've got methanol injection. Just to try and cool the charge as much as possible. When its all said and done and if its running right, I think your 10.9 goal will very possible. Hell, I managed to get a 10.9 without the turbo.

The 4.8 with the turbo I've got spools pretty darn fast. So its hard to determine how it is out of boost. Compared with the 5.3, I have to run about 2 - 2.5psi more to make up for the smaller engine. But that's okay, on the street the car is completely useless anyways. Spins the tires very badly if I punch it while cruising down the highway at 65mph. If you asked me if I'm disappointed that I went for a 4.8 rather then one of the others, I would say no. Nothing beats telling people its the smaller engine out of the bunch, and watching their reactions. I also ran the 5.3 with 317 heads, as well as my current motor. So I'm sure the low compression really doesn't help too much when its out of boost anyways. They both feel the same.