"unopened" and "street trim" info

[superroo]

Hey all, how are we?

I'm just after some clear definitions on the above two terms, "unopened" and "street trim", and what can be done while staying within those guidelines.

"Unopened" - obviously heads can't have been off. But what can be changed? Intake/exhaust manifolds? Rockers? Cams? (pretty sure that’s a no) injectors? and stuff like that

"Street trim" - pump fuel, street tyres, full exhaust. What about the interior? Only got to be street legal?

Thanks for your responses

Cheers

[schnoods]

Unopened generally means just that. The exception ( in the other camps opinion ) is valve springs. Injectors would be fine too. Extractors are ok as its bolt on but inlet is an iffy. Any thing else that doesnt bolt up externally generally isnt unopened ( cam, heads, etc.)

Street trim the way it came out. No spare wheel, streetable tyres (with tread), pump fuel and full exhaust running cats and muffler/s.

My 2c

[Polyal]

Originally Posted by schnoods

Unopened generally means just that. The exception ( in the other camps opinion ) is valve springs. Injectors would be fine too. Extractors are ok as its bolt on but inlet is an iffy. Any thing else that doesnt bolt up externally generally isnt unopened ( cam, heads, etc.)

Street trim the way it came out. No spare wheel, streetable tyres (with tread), pump fuel and full exhaust running cats and muffler/s.

My 2c

Yeah its all over the place.

Unfortunately there is no definition, but IMO street is pretty much what schnoods said, but I would allow slicks or atleast something better than your usual tyres. Other than that everything else that you would normally drive around in down to the shops.

As for opened/unopened, I cant believe that even exsists. The only category you need is engine, so V8 n/a, I6 n/a , I6 Forced, V8 Forced.

[superpursuit83]

I have apparently been opened, when I put in the performance enhancing billet pump gears (Can of worms anyone?)

[bigAl]

i think this whole unopened ect ect is more tuning shop braging rights to get an "edge" in sales.

[ratter]

Unopened is a term that gives an even playing field for tuners to prove their tuning ability.


A unopened motor from the factory will be very similar to the next unopened motor so if a tuner gets better results, it shows his ability. if a motor has been rebuilt or modified it can show that the combination is good or bad and the tuning is still important for results but not as important as a unopened motor to prove results as a perecntage of overall gains.

Changing to oil pump gears on the Boss, although itself does not help with power, but it allows the owner to rev his motor higher with confidence which can help with 1/4 mile times, also how do you police that cam timing has not been altered, Chris proved that by changing cam timing that the motor can be made to go quicker over the 1/4

Changing valve springs on a turbo motor helps the motor run more boost by stopping valve float, which is not a problem at normal boost levels.

Changing valve springs on a LS1, brings back lost power from weak factory valve springs which cause valve float at higher revs after they have softened with age.

[Craig]

Originally Posted by superpursuit83

I have apparently been opened, when I put in the performance enhancing billet pump gears (Can of worms anyone?)

No can or worms but the simple fact is in your case it's classed as opened.

[Craig]

Originally Posted by bigAl

i think this whole unopened ect ect is more tuning shop braging rights to get an "edge" in sales.

Of course it's bragging rights that's why shops like mine race our street cars down the 1/4 to show our talents and to get different performance data to show our customers or potential customers what works and what doesn't.

If you got two cars out there from two different shops and one car is consistently quicker and faster (don't have to win - the driver makes a difference there) the punter watching or reading the forums will i think go to the shop that runs quicker, isn't that human nature??

Why do we "strip" the car for racing? Well been there done that in a full weight manual BA XR8 ute and it's extremely difficult to get these cars to hook up on a drag strip in street trim, there's no fun in pedalling the car all the way down there. The best i could achieve in "FULL" street trim was 13.14 with a passsanger. The next week with 4.10 diff gears and only slicks and front runners being the changes it went 12.58 and then a week later in sydney it went 12.49.

Bring it home and take off exhaust, tailgate, pass seat, 90/10 shocks, towbar and lighten it by about 110kg and the times drop to 12.15.

It's alot more fun running in a race set up than it is in full street trim.

It's horses for courses, whatever takes your fancy if you want to run in full street trim that's fine but it's a lot more fun when you set it up for racing.

And as i have said many times before until there are rules drawn up and we have an indepentent scrutineering these cars well it's run what you brung and do as you please.

[Bluepower]

Our scene is following the LS1 scene fairly closely - this is where a lot of it comes from.

[SpoolMan]

If we are following the lead of others like the XR6 Turbo lead this would mean unopened isn't really unopened.
The rules are simple make them up us you go along, don't have any rules keeps it even more simple.
You can have all the rules in the world in the end it comes down to one thing, Honesty.

Never loose the site for most of us its the enjoyment is the drag racing regardless of ET, the mods or opened or unopened sometimes this goes with to much politics.
I remember when Rod got bagged for removing a highlight lens and was called a cheque book racer for importing 2 drag radials for $1400 the understanding has come along way since then.

Run what yah brung hope its enough and just go out and have Fun

[bigAl]

A unopened motor from the factory will be very similar to the next unopened motor so if a tuner gets better results, it shows his ability. if a motor has been rebuilt or modified it can show that the combination is good or bad and the tuning is still important for results but not as important as a unopened motor to prove results as a perecntage of overall gains.

Ahh now it all makes sense

It's alot more fun running in a race set up than it is in full street trim

You got that right mate. Even my street trim is half striped out anyhow. I love the rawness and character you out of the car from it.
I'm not an angle when it comes to chasing ET's, everyone would have seen me stripping everything out of my ute at the AFF drag meet.

[FS5]

so how much would you knock off your ET by stripping out the interior on a sedan?and
how much more MPH would you gain?

[ratter]

Rule of thumb was you would gain 1 tenth for every 100 lbs of weight you reduced the car by.

With Street cars you would be lucky to remove approx 100 kgs with the normal removal of exhaust and seats and tailgate

[XR-ENVI]

Originally Posted by superpursuit83

I have apparently been opened, when I put in the performance enhancing billet pump gears (Can of worms anyone?)

a bit like ours, when it was intially "opened", the rods were replaced for reliability not performance

[superpursuit83]

Originally Posted by XR-ENVI

a bit like ours, when it was intially "opened", the rods were replaced for reliability not performance

Yeah, but what Craig and ratter says is true... We wouldn't push our engines as hard if we did not improve the weak spots...

[superroo]

Thanks all. You've cleared some things up for me.
Thanks craig, thats probably the best summary of unopened/opened i've heard

Cheers

[CAMS290]

I was reving mine to 6800 before i had oil pump gears fitted, and i am not reving any harder now, just peace of mind.

But my motor was opened when Ford replaced the cam chain tensioners under warranty.

[Cobra]

My understanding of something being opened is any engine that has had any replacement or modification of a factory component that enables it to rev higher, obtain more power and or reliability which requires lubrication to operate. I mean, unopened by definition is just that, so that obviously includes oil pump gears and valve springs. But in the circles of LS1, valve springs is not to be considered as opened. It apears that we are following the same trend over here, with oil pumps gears on BOSS' and more so valve springs on turbos being considered unopened.

As for street trim, I don't think any weight is alowed to be removed? Even removing the spare, although not illegal, is still remvoing weight from it's original factory quoted weight. WIth tyres as long as they are street legal treaded tyres then they are fine. I don't beleive the M/T streets are actually legal to drive on as I thought the name was derived from a "street" class DOT radial. But I could be totally wrong...

[hamo]

Originally Posted by CAMS290

I was reving mine to 6800 before i had oil pump gears fitted, and i am not reving any harder now, just peace of mind.

But my motor was opened when Ford replaced the cam chain tensioners under warranty.

agree. I haven't done the oil pump gears...yet. but i'm not thinking about that when going down the 1/4.

[SpoolMan]

Originally Posted by hamo

agree. I haven't done the oil pump gears...yet. but i'm not thinking about that when going down the 1/4.

Do a 12sec pass then you can have your gears..lol.

[Craig]

Originally Posted by Cobra

But in the circles of LS1, valve springs is not to be considered as opened. It apears that we are following the same trend over here, with oil pumps gears on BOSS' and more so valve springs on turbos being considered unopened.

I don't believe we are following the trend over here. If anyone changes Oil Pump Gears on the V8 and valve springs on a Turbo then it's considered OPENED end of story.

The unopened deal in the LS1 scene is a joke IMO.

They have classes that i reckon make sense except for the valve spring deal. We should or could consider these for any future events.

The classes are BOTS - BOSS- LSSR - LSSS - LOF - Details below


LS1, LS2, L76 & L98 BOLT ON TRUE STREET (BOTS)
"Cars Racing in True Street Trim"
TYRES:
Street Legal RADIAL construction tyre - as big as the FACTORY placard allows
No Drag Radials

BODY:
Full stock silhouette with all body panels remaining 'as stamped' and road legal lighting operative.
Additional bodykit optional. Aero mods free
(ie. utes MUST run rear gate, sedans retain headlight)
Factory seats and full interior must be retained
Spare wheel, tool kit, all must be retained
A/C heater motor in place.
Window mechanism retained

ENGINE:
Unopened engine (minimum idle vacuum to be checked)
Valve Springs Free
Single throttle body inlet manifold
Full exhaust system with pipe(s) exiting in factory location
Full size stock radiator
Air Filter (of some type) MUST be retained
98 Octane pump unleaded only

PCM:
Management type Free, calibration Free

TRANSMISSION:
Stock transmission fitted as described on build tag
Internal gearbox modifications (eg stall converter, upgraded synchros) free.
Gearbox ratios to remain standard
Differential ratio and operation free

SUSPENSION:
Shock absorbers and springs free

OTHER:
No power adders
Vehicle must have original ADR compliance tag affixed, and carry an identifiable Holden VIN Number
Minimum Raceweight - excluding driver - 1600kg


LS1, LS2, L76 & L98 BOLT ON STREET STRIPPER (BOSS)
"Stripped Down Bolt On Class"
TYRES:
Any tyre allowed to a maximum of 275mm

BODY:
Body specification free
Interior free

ENGINE:
Unopened engine - requirement (minimum idle vacuum to be checked)
Valve springs free
Single throttle body inlet manifold
Air Filter free
Exhaust free
Fuel free

PCM:
Management type Free
Calibration Free

TRANSMISSION:
Stock transmission fitted as described on build tag
Internal gearbox modifications (eg stall converter, upgraded synchros) free.
Gearbox ratios to remain standard
Differential ratio and operation free

SUSPENSION:
Shock absorbers and springs free

OTHER:
No Power adders
Vehicle must have original ADR compliance tag affixed, and carry an identifiable Holden VIN Number
Minimum Raceweight - excluding driver - 1400kg


LS1, LS2, L76 & L98 SUPER STREET RADIAL (LSSR)
This category is for the more serious drag racer using radials BODY:
Body specification free
Interior free

PCM:
Management type Free
Calibration Free

TYRES:
Radial tyres are the only type of construction allowed.
BFG Drag Radials, M/T Drag Radials and Nittos are all acceptable.

TRANSMISSION:
Maybe be either Manual or Automatic

CHASSIS:
All cars must have the original chassis only, no modifications permitted.

SUSPENSION:
All cars must retain stock style suspension and factory locations.
No fabricated control arms, 4 Links, ladder bar rear ends or chassis connectors.
Standard wheel tubs must be retained unaltered.
Outer lips may be rolled.

OTHERS:
Must have current registration.


LS1, LS2, L76 & L98 SUPER STREET SLICK (LSSS)
This category is for the more serious drag racer using slicks
BODY:
Body specification free
Interior free

PCM:
Management type Free
Calibration Free

TYRES:
Slicks and front runners

TRANSMISSION:
Maybe be either Manual or Automatic

CHASSIS:
All cars must have the original chassis only, no modifications permitted.

SUSPENSION:
All cars must retain stock style suspension and factory locations.
No fabricated control arms, 4 Links, ladder bar rear ends or chassis connectors.
Standard wheel tubs must be retained unaltered.
Outer lips may be rolled.

OTHERS:
Must have current registration.

Safety Notice:
Any vehicle running an ET of 12.5 or better and or trap speeds in excess of 110mph whilst using cross ply slicks will be required to use cross ply front runners.


LS1, LS2, L76 & L98 OUTLAW & FRIENDS (LOF)
Any LS1, LS2, L76 & L98 powered, four wheeled, vehicle that does not meet the BOTS, BOSS, LSSR or LSSS rules.

[gurujosh]

I have a BA MK1 XR6T that i had a tune done on.It made 244rwkw with just tune,the tuner said the valve springs were crap but i went and raced.The best time was 14.0 which is no real better then stock as i was losing alot of power in top end.i got valve springs done and a retune which only made 5more rwkw but was able to keep power up top..i raced after this and did a 12.8..
So to me i think its fair enuf getting valve springs done on a MK1 considering how much it affected the times

[ratter]

Well done on the times

Your post makes it clear how much a performance benefit the valve spring change is on the T.
If you had been running standard boost, the springs would not be needed hence is why they are a performance mod rather than a reliability issue. Don't get me wrong, if I owned a T, I would be changing them so I could run more boost, I just wouldn't call it unopened.

[gurujosh]

Originally Posted by ratter

Well done on the times

Your post makes it clear how much a performance benefit the valve spring change is on the T.
If you had been running standard boost, the springs would not be needed hence is why they are a performance mod rather than a reliability issue. Don't get me wrong, if I owned a T, I would be changing them so I could run more boost, I just wouldn't call it unopened.

I dont mean to sound like a smart **** but can you tell me how you can make a XR6T go quicker without raising boost??
In the MK1's with some of them it is a reliability item as when you do raise boost a little you get valve float when you give it a hit on the streets and not only at the track..It must have been a reliability issue with the mk1's as from my understanding they changed the springs on the the mk2 and BF..
Coming from a turbo side can I ask why alot of the BOSS guys change the diff ratio??Is it a reliability thing or a perfromance gain???

[SpoolMan]

Originally Posted by gurujosh

.It must have been a reliability issue with the mk1's as from my understanding they changed the springs on the the mk2 and BF..

No point in debating this, for the purpose of the rules the XR6 Turbo guys have set out your car would fall under the unopened category.

[XRQTOR]

Originally Posted by gurujosh

I dont mean to sound like a smart **** but can you tell me how you can make a XR6T go quicker without raising boost??
In the MK1's with some of them it is a reliability item as when you do raise boost a little you get valve float when you give it a hit on the streets and not only at the track..It must have been a reliability issue with the mk1's as from my understanding they changed the springs on the the mk2 and BF..
Coming from a turbo side can I ask why alot of the BOSS guys change the diff ratio??Is it a reliability thing or a perfromance gain???

So along your line of thinking you can put new rods in an engine, they dont make power themselfs but they allow you to safley spin the engine harder hence more power. Once you crack any seal it's open'd.

[gurujosh]

Originally Posted by XRQTOR

So along your line of thinking you can put new rods in an engine, they dont make power themselfs but they allow you to safley spin the engine harder hence more power. Once you crack any seal it's open'd.

I dont see where I said anything about pulling the engine apart to put new rods in it and to be honest i dont really care what people do to make there car go quicker but everytime someone does a good time instead of people congratulating them theres always a few questions asked about whats been done to the motor etc etc..The rules should be setup like the LS1 guys have setup thr's..

[SpoolMan]

Originally Posted by gurujosh

.The rules should be setup like the LS1 guys have setup thr's..

More trouble than its worth, creates controversy everyone has a different idea's and agenda.
Your allowed valve springs under xr6turbo rules puts your car on a even field with the BF.

We have 2 Boss motors that are different inside the engine, I can just see the unopened rules allowing the Boss 260 new valve springs.

Cars that have no interior and no exhaust should be classed as race cars, yes saving weight improves your ET but isn't like the unopened rule, changing valve springs etc, helps your ET.
IMO.

Quote from Budget Racer ''I don't want to win I just want to race''.

[Craig]

Originally Posted by SpoolMan

I can just see the unopened rules allowing the Boss 260 new valve springs.

Forget that, the rules are simple, "You open the engine for improved components ie: Billet Oil Pump Gears, Valve Springs then it's opened"

I don't see how it can be any clearer.

[SpoolMan]

Originally Posted by Craig@ACE

Forget that, the rules are simple, "You open the engine for improved components ie: Billet Oil Pump Gears, Valve Springs then it's opened"

I don't see how it can be any clearer.

XR6 Turbo.com boys already have this rule in place and have had for some time, puts the BA and BF engine on a level playing field, changing there rules is like changing the LS1 rules you wont do it..