Ok, with the 07 nbs and the tvs 1900 it seems there is much room for improvement on the performance scale without completly ruining the driveability-right?

I know the L92 heads are so big that it's capable of moving lots of air, but it makes for a dog down low. Last night a guy in an 03 3/4 ton with 33" mudders goes to pass me and with a 5 mile highway and no lights coming his way I guess he decided to just stay right beside me at 70 mph. After a couple hundred yards of that I decide to mat it only to find him pull up even in short order and without the upcoming curve would have passed me at 95 mph.

I thought this setup would help the low end some (it has) and thought it would be stronger on the top end (some) but that experience exposed the fact that at 7000ft and 5.5 lbs of boost, the truck still needs more huevos.

We have disabled the dod function which helped with the surging. I am considering perhaps trying a different cam. Any ideas on what might wake this truck up throughout the powerband? I am guessing that right now it's a mid 13's truck even with the 2.8 pulley and 9+lbs of boost. My 01 C3 with the lq4 was more than a second slower at the track stock vs stock, but with a reworked whipple and 10psi sure felt much stronger. ideas? Joe/others?

 

Get a crank pulley from Joe at LeftCoast32 for some additional boost. Add meth injection, increase your timing as the meth allows and you should be in the 600rwhp range at sea level. If that's not enough then look at your exhaust before you do a camshaft.

If your not happy with the performance of the TVS1900 your tune is the 1st place I'd look.

 

Gears maybe a loose convertor. Also have you done any exhaust mods? The more that goes in it also has to come out.

 

where can i find this joe and leftcoast32 ?

 

The DOD cams are made to save fuel not for all out performance. I would say do a cam that is DOD delete. I spoke with the owner of the shop that did your install and he agreed that the cam needed to come out for any real performance.

The L92 heads love boost, the key is to get a cam that takes advantage of the flow numbers. LEP has a great MagnaCharger Cam that works with the L92's.

I just replied to your PM.

 

yea i posted that before i found u , btw another pm sent , quick q wat a dod cam ?

 

Well it has dynatech LT's and a B&B cat back on it already. I don't think the hold up is the exhaust. I do occasionaly see the fuel pressure spike up from 58lbs to 70+. On the way home from Phx it read -18.6 all the way. I'm guessing that issue is related to the aeroforce gauge and not actual fuel pressure, or I'm thinking I would have been pushing it home.

Although I'm not going for "all out performance" this thing may need a different cam to pull more power out of it. Just seems like there should be more as is?

 

That must have been one hell of a strong running 3/4 ton. Was it a tuned Dmax? If not it must have had something pretty serious done or a shot of n20. It would take a hell of a good running gas HD to run with your truck bone stock from a roll like that.

Keep in mind that a mid 13 sec sea level truck at 7000' elevation is going to be in the low 15 sec range at best. I live at 7000' elv as well and I know what you mean about the elevation kicking you in the *****. With 2psi less boost, and 4* less timing I went from 10.85@124(5900' elv track on a 40* day)) to a 10.3@129MPH (650' elv track on a 90* night). At 7000' you need it takes ~3.5psi of boost to just to generate a sealevel aptmosphere. So at 5.5psi your more like 2psi, so I can see how you would be dissapointed. What is your WOT AFR ratio, and timing*?

I agree with the above, a good tune, meth kit, larger crank pully, and a short duration high lift cam should help alot. probably 8~10 psi is going to be the max on that blower at 7000' but still a big improvment.

 

DOD = Displacement on Demand. Shifts the motor from a v-8 to a 4 cylinder for long stretches on the fwy.

 

yeah I've seen some hot dmaxes from off the line, but at 95 mph?????? My tuner recommends we first try a meth kit. My only complaint, is that on the last truck that had one the filler bottle was waay to small. I need like a 2 gallon setup for dd. We will try that first, then maybe another cam in the future.

Of course, if I get rolled like that again, the savings account is getting raided. Especially if it's a ford.