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I posted this over at TT. This is simply a cut and paste of that post.

Today I mounted a set of P275/60-17s to a set of stock off-road Titan wheels. The tires were just Goodyear Wranglers (like what I have on the stock 18" wheels that came with the truck). These tires are 29" tall when mounted and the 18" stockers were 32.5" tall. So the diameter decrease and the reduced rollout helped a litte with overall gearing. Traction started getting a little iffy, an occassional squeal, but they never "lit up" from a 1500-2000 rpm launch, stomp the throttle all the way to the floor. No problems with traction on nitrous. The truck now shifts into 4th gear with or without the nitrous. The bad thing is that it shifts rather lethargically and seemingly with some lash. I don't think the transmission is handling that well. Of interest there is that it is shifting into 4th at 5500 rpm instead of ~6100 like the other two shifts.

An interesting note for the VDC: at about 30mph with the VDC on, the slip light would flash just driving. With the VDC turned off I had no issues. It didn't feel like the brakes were being applied to the rear or anything but I wasn't going to try and make a run with the slip light going off, either. So there you have it, you have to run 4 same-height tires for the VDC to work OK. Or you can dive with it off.

The weather was humid (it rained on us almost all the way to a surprisingly dry track) and temps were in the low 70s. Last time I ran the 14.02 previous best on nitrous, the temps were in the high 50s. With the constant threat of rain, I didn't make any baseline passes with the stock 18" wheels and tires. I ran two identical 14.85s with just the shorter tires, an improvement of about 0.1 sec from the last visit but I also ran some 15.0s that day as well. I think the shorter tires were worth more like 0.15 secs, but that's just a guess.

They changed the readout for the scales at the track and I forgot to ask them if it was calibrated or not. My truck usually hovers around 4950-5000 pounds with me in it. Tonight it was at 5110. I know the wheels/tires on the back are definitely lighter so they either calibrated the scales at the track with this new readout or there is some new error in the gauge.

I also ran a 13.99 so the 13.98 wasn't the only 13 second run. But I also ran a slew of 14.0s too.

I think I'm going to get an OBD II scanner next so I can start knowing what things are doing with/without the nitrous on. As far as performance mods, I may finally break down and get a Volant. Or I may try junkyard searching for an electric fan setup to see what that does.

I hope everyone had a good Thanksgiving - I get to work Sat and Sun - oh yea...
 

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WOW!!! While this is way above me, very interesting read!
 

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The_Head what would your 1/8 mile time be. I imagine that you would have blown me off the track. Your 1/4mile time is only like 3 seconds longer than my 1/8th time
 

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Great! 13s!! Hey, I too, am working today. They called me while I was on the way to visit the inlaws grandparents, so I had them drop me off. Some one has to do it, huh?
 

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LOL - When I saw the title of this thread I thought someone had put 13" wheels on their Titan. Nice times. Rigging up an electric fan sounds like a nice project. Keep us posted if you do that. Maybe Volant will give you an intake for free since you always post your times and get people interested in your mods.
 

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Discussion Starter #6
Caltitan said:
LOL - When I saw the title of this thread I thought someone had put 13" wheels on their Titan.
That's damn funny! :lol: :lol: :lol:

Caltitan said:
Maybe Volant will give you an intake for free since you always post your times and get people interested in your mods.
I think they sell enough as it is. I'd love to compare the K&N and Volant back to back. What's interesting is that people are claiming gains from the Volant and yet when I saw Jettech's dyno pic off his website, it shows less power. I dunno, I guess I'd like to see some before/after with it on the dyno from another person before committing.

I did order a mechanical fuel gauge that I can plumb into my nitrous solenoid supply line so I can see what's going on there. Most likely an OBD II scanner will be coming so I can see what the timing is doing. I'd love to get a wideband put on but for $400+, I think I'll pass for now (although I'm sure it would pay for itself in the long run).
 

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Discussion Starter #7
m4ck said:
The_Head what would your 1/8 mile time be. I imagine that you would have blown me off the track. Your 1/4mile time is only like 3 seconds longer than my 1/8th time
Motor:
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on the spray:
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Keep in mind I'm at 13 feet of elevation in Houston.

I have the timeslips scanned at home and will post them later on this evening. Or you can go over to TT and see them there.
 

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Very nice time. I dont have a 1/4 mile track around here. Ill be looking for one though.
 
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