Twin Turbo 1UZ 1970 Ford Capri street/strip car

[FoPar]

You're running more boost with new tune ??
I would suspect valve springs boost holding
valves open...
Are the buckets still shim over ??
I don't really want to go that fast just consistent !!
Mind you a few years you guys possibly thought the same??
Big potential for our project then .. Ha ??

running 1psi more, boost was going up 2-3psi during the run. at first we thought valves but we aren't sure. yeah still shim over.

Joe wanted a low 9-sec street car, none of us thought it would end up being almost a 7-sec street car the car was consistent as first time we went out on E85, the more you push the harder it is. when we get it sorted she will be consistent again.

some people feel the urge to go faster some are content with what they have. best to see how u feel in the future, but also prepare for it incase u do. saves u money in the long run.

 

[ash]

You're running more boost with new tune ??
I would suspect valve springs boost holding
valves open...
Are the buckets still shim over ??
I don't really want to go that fast just consistent !!
Mind you a few years you guys possibly thought the same??
Big potential for our project then .. Ha ??

supercharged boys up here still have shim over, no issues
nearly 50 psi, 9500+ rpm

if Joe hasn't flicked any shims out, the springs are ok.

im running the shim over method too.
there is a result and cause to everything..
flicking the shim out is a result of something else, not just having to change to under shim cause everyone else is doing it

 

[ash]

BTW, keep up the good work paul.

 

[XR8tt]

supercharged boys up here still have shim over, no issues
nearly 50 psi, 9500+ rpm

if Joe hasn't flicked any shims out, the springs are ok.

I'm running the shim over method too.
there is a result and cause to everything..
flicking the shim out is a result of something else, not just having to change to under shim cause everyone else is doing it

It's in the cam profile.. Your limited to cam specs...
If it's valve float chances of spitting a shim is very high...
Spring tension ties it all together..
1/4 mile engines are built different to circuit thank goodness..
What spring tension is being used on high boost levels ???
Cam specs ???
Although it seems cam specs are not the be all and end all when it comes to making power...
They make a difference to the way it's delivered..

Shim less is lighter and technically better...

 

[ash]

It's in the cam profile.. Your limited to cam specs...
If it's valve float chances of spitting a shim is very high...
Spring tension ties it all together..
1/4 mile engines are built different to circuit thank goodness..
What spring tension is being used on high boost levels ???
Cam specs ???
Although it seems cam specs are not the be all and end all when it comes to making power...
They make a difference to the way it's delivered..

Shim less is lighter and technically better...

i just dont read forums, and then repeat it as gospel.
i know what Joe is running, i spoke to fopar..
we are running 50 + deg more duration , and more lift.. so dont just say its the profile..

 

[XR8tt]

i just dont read forums, and then repeat it as gospel.
i know what Joe is running, i spoke to fopar..
we are running 50 + deg more duration , and more lift.. so dont just say its the profile..

I don't just read forums either ..
I built my heads around 2J's valve train..
Where I know what springs work..
Way back I couldn't get springs off the shelf that worked..
Springs Aust re called the springs I bought as there was a legal case against them...
You seem to knock whatever I post ...
Do what you want but shim less is better...
Allows more spring height, bigger base circle cam etc..
50* more duration than what ???
More lift than what ???

 

[ash]

You seem to knock whatever I post ...
Do what you want but shim less is better...
Allows more spring height, bigger base circle cam etc..
50* more duration than what ???
More lift than what ???

no i dont knock all your posts,..... just the ones that are rubbish .
you mainly are repeating the stuff you have seen somewhere else.

regarding the duration and lift comment, have a harder think about it.

 

[XR8tt]

no i dont knock all your posts,..... just the ones that are rubbish .
you mainly are repeating the stuff you have seen somewhere else.

regarding the duration and lift comment, have a harder think about it.

Ok list where it has been posted else where ??
If it has then ?? I'm not the only one..

Kelford and all the top N.Z stock car guys run the latter shim under
gear...

If you are getting away with it then that's all you have to say...

Because you don't agree to you it's rubbish !!!

Spring and cam specs ?? Please !!!

 

[ash]

Ok list where it has been posted else where ??
If it has then ?? I'm not the only one..

Kelford and all the top N.Z stock car guys run the latter shim under
gear...

If you are getting away with it then that's all you have to say...

Because you don't agree to you it's rubbish !!!

Spring and cam specs ?? Please !!!

no, there are processes that work, and we do differently / build wise. thats all cool,i got no probelm with that... mkore that 1 way to skin a cat
its the post u make, and act all high and mighty.. thats the rubbish bit.

lol, i not telling you my personal cam stuff

 

[XR8tt]

no, there are processes that work, and we do differently / build wise. thats all cool,i got no probelm with that... mkore that 1 way to skin a cat
its the post u make, and act all high and mighty.. thats the rubbish bit.

lol, i not telling you my personal cam stuff

Yea well how about adding some technical assistance to assist this site.. ...
High & mighty ?? Far from it ...

You can't post your specs etc They don't have to be exact ...
What lift and springs are you running or would you run ????
If your using std bucket ???

 

[FoPar]

everyone does things differently. what may not work for some doesn't mean it won't work. if shim over, or shim under whichever works for u use it

as Ash said his cams are huge compared to ours, when he told me the specs i thought he was saying advertised not at .050' we run .410'' lift on Joe's, spins well up to 8500rpm. the springs are from a motor bike, can't remember which one. run about 100lbs on the seat. we use standard valves, everything in the head is factory stuff except the sprngs of course.

 

[XR8tt]

I've had similar issues with my Ford..
At first it was Std TFI was playing up..
Issue was fixed by lowering voltage to 10v..
Latter went to wasted spark and crank, cam senser..
Doing away with TFI and distributor..

Latter one of the EBC solinoids started playing havoc..
Which bought in over boost function on ECU..
Then there was RFI interferance..
Better engine earths fixed this issue..
Thats about 10.4 mm lift..
Hmm ?? Springs seems to be light for boost level...

 

[FoPar]

I've had similar issues with my Ford..
At first it was Std TFI was playing up..
Issue was fixed by lowering voltage to 10v..
Latter went to wasted spark and crank, cam senser..
Doing away with TFI and distributor..

Latter one of the EBC solinoids started playing havoc..
Which bought in over boost function on ECU..
Then there was RFI interferance..
Better engine earths fixed this issue..
Thats about 10.4 mm lift..
Hmm ?? Springs seems to be light for boost level...

we have to start eliminating things, once we do that we can work out what it is. 100lbs on the seat is good for 40+psi, seen cars run 110lbs pumping in well over 50psi.

 

[ash]

. 100lbs on the seat is good for 40+psi, seen cars run 110lbs pumping in well over 50psi.

^^
yes, just looking through some data logger files here.......
you are correct .

 

[XR8tt]

Yep can't take anything for granted that's for sure..

Spring tension alone doesn't disallow anything ..
Could be a weak spring and when it comes to
the whole package .. Lift and acceleration on and off the
cam lobe too..
Keep in mind exhaust back pressure on turbo engine...

Possibly a combo of timing & fuel ??...

 

[FoPar]

it's definitely something, we will hopefully get some more data at next week's Test n Tune.

 

[ash]

it's definitely something, we will hopefully get some more data at next week's Test n Tune.

you got those valve springs we talked about ?
want me to send the part number again?
keep chipping away, you'll run 7.8's i think..

 

[XR8tt]

Fine line as boost increases and I doubt a dyno would hold enough load to imitate
the strip in such a short time..
I guess backing off timing a smigen to see if it improves ??
Would be the safe way??
Or adding more fuel ??
On the odd chance it's pre ignition / detonation ??
Being E85 I guess reading plugs is much harder??
The guys that tuned it would be one of the best around !!!
Yes the issue is coil bind with such a short spring height..

 

[FoPar]

you got those valve springs we talked about ?
want me to send the part number again?
keep chipping away, you'll run 7.8's i think..

nah, were using some ones Macca got, they are his spec or from a motorbike or something can't remember. they seem to be alright, if it was valve springs it would have other issues also.

 

[FoPar]

Fine line as boost increases and I doubt a dyno would hold enough load to imitate
the strip in such a short time..
I guess backing off timing a smigen to see if it improves ??
Would be the safe way??
Or adding more fuel ??
On the odd chance it's pre ignition / detonation ??
Being E85 I guess reading plugs is much harder??
The guys that tuned it would be one of the best around !!!
Yes the issue is coil bind with such a short spring height..

its pretty easy to read the plugs with E85. the 8.20 pass was exactly the same as the 8.27 pass same tune everything, checked the logging and all the data AFR etc matched both runs. it's gotta be something electrical in regards to popping.