HTT vs. Cheetah

NWTDIESEL

On a Time Out
May 8, 2008
1,405
0
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ATS Extreme trans
Research research research... lol....

Brayden didn't tell me 600hp with it... no one did.... i am only hoping.. I maybe be going with the 68mm but i dunno. Anyways. when it gets closer i will know. I agree with dyno's only being tuning tools. I hope that i can get to the track the following wednesday night and get a few runs in to see what kinda times i will get. I will be removing the 35's and going with some 265's for the runs. How can i see exactly what my truck weights in race trim? Also should i worry about removing my toolbox, step bars, spare tire, tailgate, My heavy ass brush guard and winch... and all that stuff? My reaction time will suck i guarantee.. My first time with a tree. LoL.. do i hit the gas on the last yellow light or what do yall say?


I would remove all the "stuff" so you can atleast get your truck to standard weight. Take it to a gravel pit or somewhere where they weigh trucks.

Yes, on the last yellow. GO!
 

NWTDIESEL

On a Time Out
May 8, 2008
1,405
0
0
ATS Extreme trans
when i go to the track the only thing that i take off is the tailgate. other than that i race it the same way that i drive it everyday

Yea, its good to know what your DD runs in everyday form.

Biggest reason i would take the winch, heavy bumpers, steps bars, toolbox, spare tire and tailgate off is because thats a a$$ load of weight to race with and only makes it harder on the truck/engine parts.......

and your times wont be near as good!:eek:
 

JShe8918

New member
Feb 17, 2009
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True that is lots of weight. Just the brush gaurd and winch is around 500 lbs. give or take some. So that is 5 tenths isn't it. Hoping to break 12.5 or so... :cool2:
 

bml2200

Member
Oct 16, 2008
256
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16
IL
Go bigger! Get the 68 or 71.5mm. I love the sound and performance of my 71.5 Cheetah. Did 13.1 last week with my winch bumper on the front and breaking traction. If I did have to do it all over again though, I would have bought some MPI twins insted for the price difference.
 

JShe8918

New member
Feb 17, 2009
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13.1... what was your 60 time... you must have large tires? i am hoping for 12.5 on 265's and 13 something with the 35's. I am thinking the 68mm or the 64mm are gonna be better for me.. Lots of towing.
 

FMOS

Hard Up
Nov 19, 2008
352
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Fort McMurray, Alberta, Canada
I don't want to spoil anybody's parade... but I wouldn't have high hopes for a 12.5 your first time out.

There is a lot of dedicated guys with quite a few mods that aren't passing that mark by much. I don't know much because I don't drag race, but I do know that it will take a fair amount of setup to get into that range.
 

Idaho CTD

Junkie
May 28, 2008
179
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Idaho
You have to remember that some of the numbers quoted by turbo companies are for the compressor wheel in it's original housing (for hybrid turbos). When you change the AR ratio of the compressor housing or don't have enough difuser area (too big of a compressor for the back plate/housing). It can greatly effect the flow of the wheel. It's like taking a K31 wheel and putting it in a S300. The two housing sizes and AR ratios are quite different so you lose a lot of flow dropping to a S300 chassis.
 

knagel

weakest link finder
Jun 4, 2007
221
1
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Central, Iowa
Brayden is a sharp individual , but if i remember the 71.5mm cheetah is only 5lbs per minute more than the HTT S366 , and the S300 is @ the top of its map @ 600 hp . that is why i have concern of it supporting 600 hp . i could be remembering wrong .

edit HTT = 82 lbs per minute
71.5 cheatah 88lbs per minute from a post on dp

Can you post a like for the Cheetah maps on DP. I could only find some info on the 64mm. When at 88 lbs per min. is this at the top of the map or the right hand side? I have seen many maps that show 90 lbs/min on the choke line but when you figure it against HP to get the presure ratio it lands at the top of the map no where near close to the 90 lbs/min on the choke line, closer to half 50 lbs/min
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
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slc tuah
Can you post a like for the Cheetah maps on DP. I could only find some info on the 64mm. When at 88 lbs per min. is this at the top of the map or the right hand side? I have seen many maps that show 90 lbs/min on the choke line but when you figure it against HP to get the presure ratio it lands at the top of the map no where near close to the 90 lbs/min on the choke line, closer to half 50 lbs/min

as far as i know there are no maps for the cheetahs , the 88 lbs per minute came from one of braydens posts , i have no idea how the # was tested or acheived . if your interested in one it would be best to call him and get the info from the horses mouth .
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
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slc tuah
You have to remember that some of the numbers quoted by turbo companies are for the compressor wheel in it's original housing (for hybrid turbos). When you change the AR ratio of the compressor housing or don't have enough difuser area (too big of a compressor for the back plate/housing). It can greatly effect the flow of the wheel. It's like taking a K31 wheel and putting it in a S300. The two housing sizes and AR ratios are quite different so you lose a lot of flow dropping to a S300 chassis.

so you are saying that the flow # came from the wheel that was used and not an actual test performed to get the lbs per minute ?
 

knagel

weakest link finder
Jun 4, 2007
221
1
18
Central, Iowa
so you are saying that the flow # came from the wheel that was used and not an actual test performed to get the lbs per minute ?

Not interested in a cheetah, just bought a 4094 avnt from Dan at PPE. I'm just trying to see where they get 88 lbs/min when the 4094avnt has 80 at 2.5 pressure ratio and 50 at 3.62 pressure ratio. This is still a 600 HP charger but it is COMPLETELY at its limits. If you look at the regular 4094r it has a bigger map but on the choke side it is still 80 lbs/min but when compaired to 3.62 presure ratio it is capable of 70 lbs/min and is still 72% efficient. So I agree when you use the same wheels in a different housing you actually need to map that specific turbo because the 4094 avnt and the 4094r have the same wheels but a different A/R.

Kevin
 

beach_33

Member
Feb 18, 2008
704
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16
des moines, IA
kevin i hope they have done some work on that turbo. they haave been for sale for a while know and some of the people that have bought them have had serious problems with drive pressure. many are not happy with them because they didnt live up to what was advertised
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
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slc tuah
Not interested in a cheetah, just bought a 4094 avnt from Dan at PPE. I'm just trying to see where they get 88 lbs/min when the 4094avnt has 80 at 2.5 pressure ratio and 50 at 3.62 pressure ratio. This is still a 600 HP charger but it is COMPLETELY at its limits. If you look at the regular 4094r it has a bigger map but on the choke side it is still 80 lbs/min but when compaired to 3.62 presure ratio it is capable of 70 lbs/min and is still 72% efficient. So I agree when you use the same wheels in a different housing you actually need to map that specific turbo because the 4094 avnt and the 4094r have the same wheels but a different A/R.

Kevin

thats the exact point i was going with earlier about how the turbo in question is rated @ 600 hp , i am really not trying to bad mouth cheetah's i think there are alot of people happy with them....... but some of the suporting horse power claims i have seen are a touch higher than they should be IMOP untill i see some maps . like the 71.5 being rated for 700 hp .... even gt 4202's are getting up there in there map @ that power level if you measure @ hp the wheels .
 

TrentNell

Finally underway !!!!!
Jul 7, 2008
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slc tuah
kevin i hope they have done some work on that turbo. they haave been for sale for a while know and some of the people that have bought them have had serious problems with drive pressure. many are not happy with them because they didnt live up to what was advertised

i have heard that about the avnt37 but not the 4094avnt its barley out isn't it ?
 

Idaho CTD

Junkie
May 28, 2008
179
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Idaho
so you are saying that the flow # came from the wheel that was used and not an actual test performed to get the lbs per minute ?


On the many hybrid turbo's on the market all they have for data is the wheel in it's original housing. No one wants to pay the money required to have a map generated (around 30k last I heard) in the different housing. The housing change also effects the width and height of the map.