XT Raced At Calder Last Night - Page 3

finnster · 25-06-2008, 10:10 PM

Whats with the torque curve. Looks like that engine cant decide where peak torque is. :togo:

Peak torque is at 6300 but then its almost the same again at 6700, yet peak power is at 6800. Nice broad power band. NOT

Tiapan · 25-06-2008, 10:55 PM

well CONGRATULATIONS,....there, a CHI member saying it, yes yes you can pay me out for only running an 11.03@122.8mph :(

im sure if i didnt use street tires and pedders sports ryder springs and shocks all round maybe i could improve the 1.7 60ft

p.s. congrats on the photo shoot, all the race setup in the world wouldnt get my gin tin in a mag :( also paint looks immaculate ;)

debacle-racing · 25-06-2008, 11:08 PM

watch this space hemi power..............

HEMI POWER · 25-06-2008, 11:09 PM

Quote:

Originally Posted by debacle-racing

watch this space hemi power..............

Cool

:

debacle-racing · 25-06-2008, 11:09 PM

what heads will you buy then hemi?

ClevoCapri · 26-06-2008, 12:44 AM

Oh yeah. Nice time croc.

russxr67 · 26-06-2008, 12:54 AM

Quote:

Originally Posted by nugget378

looks like its a bit lean croc,and only a 500rpm spread between max torque and max hp that seems strange?
possibly a bit more in it with more tuning?

wonder why its loosing oil pressure as rpm's climb..

Yeah,it does look like it is a bit lean especially with 78/79 jets which would indicate croc is still running a rear pv.
That is the first thing to lose and jet it up by some 8-10 sizes in the rear.
Tuning by using af ratio's is sometimes a bit hit and miss. Using those parameters sometimes you can leave a bit on the table.
I try to tune so that the engine is making the most power and with alloys that can be 13.5 or so . It looks lean but that is where they make the best power.
Some iron headed stuff isn't as efficient and tend to like things a bit richer to make better power.
Well done Dean,there may be more left in that combo yet....

Does Zoran test at 100 rpm per sec?????

crochunter · 26-06-2008, 07:12 AM

It is running a PC valve. And still running rear power valve.

protd · 26-06-2008, 07:52 AM

Quote:

Originally Posted by HEMI POWER

Has any CHI headed Clevo's here run a ten sec pass?????I was thinking of buying a pair whilst im building my new engine but i am somehow changing my mind again.

i'll be running mine on the 9th of aug, i will do a thread on it..

what i can tell you as someone who went from ported 4v's to out of the box 3v's on the same motor in the same car is that the car is a lot more smoother to drive, the power comes on a lot more smoother and not as aggresive, and the engine run's a lot cleaner, and the power throughout the rpm range is awesome..

as hard is it is for me to say, because i love 4v heads, i will personally never fit another set to a engine againe..

while i have no doubt that the old 4v's match my 3v's as far as peak power goes, the 4v's had to run 38* total timing and run on a higher octane fuel

while my 3v's made over 480rwhp with 24* total and running crappy avgas

i have no doubt with some tunning, more timing, and a better carb the rwhp will go around the 540mark..

anyway thats my personal experiance with it, i'm not waving a CHI flag just telling my personal experiances with the 2 heads in question...

oh and i have a set of 4v's you can buy if you still want to go that way...

70 Mach 1 · 26-06-2008, 09:27 AM

Quote:

Originally Posted by HEMI POWER

Has any CHI headed Clevo's here run a ten sec pass?????I was thinking of buying a pair whilst im building my new engine but i am somehow changing my mind again.

Hemi Power my 70 Mach 1 weighs 3440 lbs (weighed 2 weeks ago on 4 corner scales) and has been 9.69@139 with CHI 218 3V's. Once the summer heat is gone I am confident that I can put the car into the 9.50's at over 140 mph.

Go with the CHI's and have someone that know's what the head wants design a cam for you. You will not be disappointed.

_2:

Chris

nugget378 · 26-06-2008, 05:03 PM

Lets keep the head comparison's out of it,all it does is cause trouble,
there is enough to talk about in that dyno graph..

nugget378 · 26-06-2008, 05:04 PM

Quote:

Originally Posted by russxr67

Yeah,it does look like it is a bit lean especially with 78/79 jets which would indicate croc is still running a rear pv.

Not always?
mine is jetted square and runs no power valves..

*edit* just saw crocs reply..

Quote:

Originally Posted by russxr67

.
That is the first thing to lose and jet it up by some 8-10 sizes in the rear.
Tuning by using af ratio's is sometimes a bit hit and miss. Using those parameters sometimes you can leave a bit on the table.
I try to tune so that the engine is making the most power and with alloys that can be 13.5 or so . It looks lean but that is where they make the best power.

I saw the same with my old 3V's russ,ran best a bit to the lean side..

Quote:

Originally Posted by russxr67

Does Zoran test at 100 rpm per sec?????

I seem to remember alot of talk/bagging about a certain dyno graph that was run at 300rpm/sec,and how that would show more power than at 600rpm/sec,what would 100rpm/sec do if that was the case?

russxr67 · 26-06-2008, 08:49 PM

Nugget,slower rpm rates allow the engine to build power against the load and can lead to higher figures.
I have seen most operators vary between 300-600 rates.

Yeah,the 3v's are a more efficient design and that usually shows up in bsfc's.
IE,they use comparably less fuel to make the same or more power than older designs of cylinder heads.

black dog · 28-06-2008, 02:03 PM

Quote:

Originally Posted by russxr67

Nugget,slower rpm rates allow the engine to build power against the load and can lead to higher figures.
I have seen most operators vary between 300-600 rates.

''russ ''that is the problem i think with the superflow dyno,the operator pulls full throttle on the engine and the dyno brake holds the rpm rate to the settings(300-600 rates)regardless to how much power it makes

the dyno will only allow the engine to rpm at those settings wich is not a true indicator of how the engine will rpm at the trak,,

i remember asking jeff about the rpm rates and he said the 600 rate is what he feels close to how the engine will operate at the trak,,

:

thing is,,, at the trak the engine is allowed to rpm freely with the given load of the car 'etc',,but on the superflow its held to 600rpm(or others)whatever the power its makeing,,

you can have two engines(different parts etc) on the same dyno both making 550hp,,but one ''can or will'' out excellerate the other on the 1/4 mile,,
in the same car''

i guess thats why the dyno is just a tool

''this is what i have experienced''

:

crochunter · 28-06-2008, 05:42 PM

Quote:

Originally Posted by xagsjoe

You coming over for the Heathcote AFF on the 13th/sept??

Yes i will be over for the ford nationals. Does anyone know where i can get some Mickey Thompson ET Streets from. 275x60

XT302 · 28-06-2008, 06:10 PM

Quote:

Originally Posted by crochunter

Yes i will be over for the ford nationals. Does anyone know where i can get some Mickey Thompson ET Streets from. 275x60

Rocket Industries Sydney, from memory they do mail order, need your shop to order for you as they dont deal with public...

HEMI POWER · 28-06-2008, 08:24 PM

Quote:

Originally Posted by protd

i'll be running mine on the 9th of aug, i will do a thread on it..

what i can tell you as someone who went from ported 4v's to out of the box 3v's on the same motor in the same car is that the car is a lot more smoother to drive, the power comes on a lot more smoother and not as aggresive, and the engine run's a lot cleaner, and the power throughout the rpm range is awesome..

as hard is it is for me to say, because i love 4v heads, i will personally never fit another set to a engine againe..

while i have no doubt that the old 4v's match my 3v's as far as peak power goes, the 4v's had to run 38* total timing and run on a higher octane fuel

while my 3v's made over 480rwhp with 24* total and running crappy avgas

i have no doubt with some tunning, more timing, and a better carb the rwhp will go around the 540mark..

anyway thats my personal experiance with it, i'm not waving a CHI flag just telling my personal experiances with the 2 heads in question...

oh and i have a set of 4v's you can buy if you still want to go that way...

Thanx for the offer but i have a pair of Cast 4V's prepped by Custom Engines many years back.

HEMI POWER · 28-06-2008, 08:29 PM

Quote:

Originally Posted by nugget378

Not always?
mine is jetted square and runs no power valves..

*edit* just saw crocs reply..

I saw the same with my old 3V's russ,ran best a bit to the lean side..

I seem to remember alot of talk/bagging about a certain dyno graph that was run at 300rpm/sec,and how that would show more power than at 600rpm/sec,what would 100rpm/sec do if that was the case?

I had my carb jetted square ran like shyte.

nugget378 · 29-06-2008, 07:20 PM

Quote:

Originally Posted by HEMI POWER

I had my carb jetted square ran like shyte.

Not all carbs are the same

xdclevo · 29-06-2008, 09:11 PM

Quote:

Originally Posted by nugget378

Not all carbs are the same

I agree nugget.
What was wrong with yours HEMI POWER when it ran like shyte?

nugget378 · 29-06-2008, 10:36 PM

Quote:

Originally Posted by xdclevo

I agree nugget.

Im going a bit bigger with mine,new guts for it arrived last week..should still drive just as well,with a little more air flow..

HEMI POWER · 01-07-2008, 04:05 PM

Quote:

Originally Posted by xdclevo

I agree nugget.
What was wrong with yours HEMI POWER when it ran like shyte?

I had a slight studder on take-off.I then got it tuned at Hallam Performance were Nick has had all is work done,they removed the block off and installed a powervalve.Made a heap of a difference in driveability and performance.I gained 1/2 a second over the 1/4 by doing this maybe something to consider.

turbomania · 01-07-2008, 04:21 PM

Quote:

Originally Posted by nugget378

Im going a bit bigger with mine,new guts for it arrived last week..should still drive just as well,with a little more air flow..

who makes that carby you have in picture?

HEMI POWER · 01-07-2008, 08:07 PM

There manufactured by Pro Systems, in the US

Gammaboy · 01-07-2008, 08:11 PM

Nope. I know who put that carby together...

nugget378 · 01-07-2008, 08:42 PM

Quote:

Originally Posted by HEMI POWER

There manufactured by Pro Systems, in the US

No its not,its from TEC performance (soverign)
The carb I have on it now is awsome,this is just for a bit more high rpm power..

turbomania · 01-07-2008, 08:42 PM

Quote:

Originally Posted by Gammaboy

Nope. I know who put that carby together...

and that is?

turbomania · 01-07-2008, 08:44 PM

Quote:

Originally Posted by nugget378

No its not,its from TEC performance (soverign)
The carb I have on it now is awsome,this is just for a bit more high rpm power..

have tec performance got a website?

nugget378 · 01-07-2008, 08:47 PM

Just message soverign on this forum..

debacle-racing · 01-07-2008, 08:57 PM

how did crocs thread become a thread about carbys?
i think we should start another thread.