[HUMMERcustoms.com/TAZ]

Hey obzidian

Good to here your ideas I like them and would work great for 1/4 mile runners or good street drivable machines. No problem with questioning me. I try to share what my experience has been. On the loss from crank to wheels is considerably lower than what you think. Hummer engineers place it at about 10%. The drivetrain is allot more efficient than what i expected even as told by G-Tech people. I'm shooting to get to 1000rwhp do not know if I can get there. This motor is not being setup the way you or i would do it for 1/4 runs. I would go a different route although would still stay with roots SC. Have a company that has built a tranny like ours with 150 runs on track with 750 rwhp. Our tranny will hold up reconfigured a little with some chromed and hardened parts. I can add GM stuff to it from other rides like vette. The bonus is the 2005 tranny came out with the new 5 planetary sun cage and gears instead of the 4 gear. Plus from discussions HP is laid down a little more gentle than say a rear wheel drive lighter car who are going to fight the torque of lifting the left front end off the ground at take off. We have a 40/60 split on power especially on flat surface. I have had to sort of redirect some of my thinking on some of this stuff.

We do not have dyno that is AWD or even wide enough to do a single axle pass on anywhere close to us. One small dynojet for smaller tuner cars.
Anything big here has to use the new model of G-Tech that NASCAR teams have gone to junking the $10,000 units they had been using for G forces and other stuff. I had talks with G-Tech questioning my own numbers they said everytime trust the numbers. Instead of 5 runs and averaging as they said. I did 12 to really see if it could hold up after allot more runs. They were done half into the wind and half with the wind and it came up the average i got. So that is all i can give on that. The 550rwhp was made at about 7lbs. maybe little more or less as it is hard to pick up on the tenths on either side but, the new digital boost guage will record tenths. If I'm wrong when I get to the real tuning with wideband logger i will be the first to apologise as i never will back an untruth especially if i can prove myself wrong which i will try to do with the more accurate tuning etc. Remember as I had to be reminded several times that the HP is being laid down on 2 axles so the G-Tech is designed on using enertia etc. so it is just giving basicly same numbers maybe better than AWD dyno that has program that has to calculate the 2 drums and you need really an eddy brake on both drums to do justice to computer figures i learned quizzing. Even a 4x4 truck that has select does not get good dyno number with single axle. They would be better off running on a AWD dyno and be more acurate in 4x4. Then the GTech guy said really any 4x4 would be better off on a GTech unit because of the way it reads Hp, torque, and g force numbers to give braking distance times etc. because in case of H2 no spinning just launch. Seemed to make allot of sense after talking to them and several dyno makers.
I had not gotten a logger for wideband tuning yet but do now. I expect this summer to really be able to do it the way i have been waiting to do it and all tuning equip. is in hand now from sponsors to do it. I ran 400rwhp with the rig before i ever added the SC. It was a good tune but headers, cats, intake all that stuff were on. There are times you just pull a really good motor out of the factory as I have only once before in my life. I was impressed. Stock I shocked a few rice rockets.

The real tuning for what I'm going to do is going to be real time over about 7 to 8 month starting with more boost then later introduce the meth inj. etc. just slowly working it up till it feels uncomfortable, you know what i mean it is a gut thing along with tech stuff. The computer built for the rig onboard so that when rig starts the computer boots and HPTUNER goes into scan mode so I'm logging wideband all the time. Just so i can see how the motor acts all the time to normal driving with boost and WOT getting onto freeway. Just really studying it allot. No laptop with the H2. Plus the computer will do all the electronics for sound, nav, and other stuff. With logger i will be able to store a really good tune and come back to it and run it more. I'm looking forward to docs finally having me better by spring and getting out and devoting all the time to the machine.

I'm trying to make sponsors happy as to what they would like to see me do with their product including HPTUNERS and HUMMER to see what the stock motor will do. Many have taken it and done all the work to the lowend, look at LPE and because of warranty they tune down real bad. Per conversation with guy that has a set of heads for me that they only give to sponsored rides and do not sell. I have to wait but, really thinking later I would like to go with LS6 heads and cam with some porting also increasing the compression with a new set of pistons out by Street and Performance Products a local co. here who had out a tuner they established their company with before selling it to Comp. Cams in Memphis. They actually put on market a tuner for the new 2005 H2 about a month or so before anyone else because i happen to go by and see them to visit and asked if they had a tuner for the 2005. They said sure but, remembered hearing a change in program so the read my rig and told me it would be about 4 months they had to go write one. So they made one for me as a gift for helping them but, they made it a little more agressive and I ran it with 87 octane in perf. tune. Makes it run real good. They continue to sponsor me and want to have a set of their new piston design I think is in production this year or may have done it last year. I know they had some at SEMA 2005. They have sponsored me with their intake even though we ended up altering it and throttle body spacer that i run with SC right now. They gave me the new coil pac cover kit they introduced in 2005 SEMA for shows. It is sweet and hides all those ugly coil wires and stuff. Really cleans up engine nice.

I have to work with stock factory motor and see what i can get out of it. You are correct about stock tranny difficulties as well but in a mile trap run You are not running a drag race so the rig is not being setup that way. Not to say all the power is not available at WOT from off the line. I'm talking to the organizers as to what the method is to getting top end times. Is it WOT from the line. No I'm told, we get a rolling start so I have to focus tuning more differently. The nice thing is I can store all these tunes and flash which ever one I want when i work on that project but, still change pulley and mess with WOT runs from dead start. I'm facing that it is a brick with 4 wheels and a steering wheel. Tranny will have some adjustments like a few vette parts added and switched to mechnaical vacuum instead of computer controlled like it is factory. I told them the tranny had to be upgraded but, would use GM parts. When I'm done I will do other things in fact I would like to if i had my choice try to drop in a 572ci crate motor from GM then push it. Plus there are a couple of tranny builders that can take the tranny we have and make it take 750rwhp with minor changes and sell it for around $2850. With direction and planning, as i think you know with your knowledge, we can do anything if we can imagine it. The tranny guys tell me for same money can do 1000rwhp.

I've been planning the last year while rig had shows. This summer i get to have my hands on it all the time for first time. It has been Dragon upgrading electronics and this and that for shows for sponsors. Some people are on board for the beautiful and awesome tricking out of inside and outside of rig by Dragon but, people have come on later are interested in the mile trap run. So tranny plus running all syn. fluids and extra coolers the power will be applied more progressively. Once we get practice runs, I have an airfield way out in the country that will let us run, we practice get to the real deal and see about retuning it needs.

Please pass on any ideas. Think outside the 1/4 mile box as I have been forcing myself to do. Now I'm looking at topend and still trying to figure things out reading allot, research as well as talking to some who have done this all be it in a sleek small superpowered sports car. But, they are happy to share the therotical concept needed to try and do this.

I hope I have been able to shed some light on what has occured with this project. Still a long way to go but, have plenty of time to get it to the best I can till time to run. I'm running against myself basicly then hoping others may get in to get a class for SUV's.

TAZ